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Philippine Army Soldiers assigned to 71st Infantry Battalion, 702nd Brigade, 7th Infantry Division, move to an objective during Salaknib 25 at Fort Magsaysay, Philippines, June 6, 2025. Salaknib 25 | Final Assault
Salaknib 25 | Final Assault
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A U.S. Marine Corps AH-1Z Viper, left, attached to Marine Light Attack Helicopter Squadron 369, Marine Aircraft Group 39, 3rd Marine Aircraft Wing, refuels on the flight deck of the amphibious dock landing ship USS Harpers Ferry (LSD 49) during Quarterly Underway Amphibious Readiness Training 25.3 while underway in the Pacific Ocean, June 3, 2025. QUART: HMLA-369 Conducts Deck Landing Qualifications Aboard USS Harpers Ferry
QUART: HMLA-369 Conducts Deck Landing Qualifications Aboard USS Harpers Ferry
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U.S. Marines with 2nd Battalion, 1st Marine Regiment, Marine Rotational Force – Darwin 25.3, conduct communications checks during Exercise Southern Jackaroo at Townsville Field Training Area, Queensland, Australia, May 30, 2025. MRF-D 25.3: 2nd Bn., 1st Marines, conduct raid with VMM-363 during Southern Jackaroo
MRF-D 25.3: 2nd Bn., 1st Marines, conduct raid with VMM-363 during Southern Jackaroo
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A U.S. Marine Corps CH-53E Super Stallion attached to Marine Heavy Helicopter Squadron 466, Marine Aircraft Group 16, 3rd Marine Aircraft Wing, prepares to lift off the flight deck of the of the amphibious dock landing ship USS Harpers Ferry (LSD 49) during Quarterly Underway Amphibious Readiness Training 25.3 while underway in the Pacific Ocean, June 1, 2025. QUART: CH53s Conduct Deck Landing Qualifications Aboard USS Harpers Ferry
QUART: CH53s Conduct Deck Landing Qualifications Aboard USS Harpers Ferry
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A U.S. Marine Corps F-35B lightning II aircraft assigned to Marine Fighter Attack Squadron (VMFA) 242, 31st Marine Expeditionary Unit, prepares to land during night flight operations aboard the amphibious assault ship USS America (LHA 6), in the Philippine Sea, May 31, 2025. 31st MEU | F-35B night flight operations
31st MEU | F-35B night flight operations
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U.S. Marines with 2nd Battalion, 1st Marine Regiment, Marine Rotational Force – Darwin 25.3, disembark off an MV-22B Osprey assigned to Marine Medium Tiltrotor Squadron 363 (VMM-363), MRF-D 25.3, during an air assault rehearsal as part of Predator’s Walk at Mount Bundey Training Area, Northern Territory, Australia, May 28, 2025. MRF-D 25.3: 2nd Bn., 1st Marines, VMM-363 conduct air assault rehearsals during Predator’s Walk
MRF-D 25.3: 2nd Bn., 1st Marines, VMM-363 conduct air assault rehearsals during Predator’s Walk
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Chief Logistics Specialist Jonathan Cruz, right, from Olongapo, Philippines, and Chief Logistics Specialist Antonio Evans, from Los Angeles, both assigned to supply department’s aviation supply division, participate in vertical replenishment training on the flight deck of Nimitz-class aircraft carrier USS George Washington (CVN 73) while underway in the Philippine Sea, May 28, 2025. Conducts Vertical Replenishment Training
Conducts Vertical Replenishment Training
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U.S. Marines with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, clear buildings during a live fire shoothouse as a part of military operations in urban terrain training during Korea Viper 25.4 at Camp Rodriguez, South Korea, May 24, 2025 Activated Reserve Marines Conduct Live Fire MOUT during Korea Viper 25.4
Activated Reserve Marines Conduct Live Fire MOUT during Korea Viper 25.4
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pilot inside a cockpit salutes towards out of frame person PACAF F-16 Demo Team conducts final flight after 30 years of enhancing U.S. relations worldwide
PACAF F-16 Demo Team conducts final flight after 30 years of enhancing U.S. relations worldwide
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Two U.S. Marine Corps MV-22B Osprey aircraft assigned to Marine Medium Tiltrotor Squadron (VMM) 364, Marine Aircraft Group 39, 3rd Marine Aircraft Wing, fly in formation over Northern Luzon, Philippines, during KAMANDAG 9, May 27, 2025. KAMANDAG 9: VMM-364 Inserts Marines into Basco Island, Philippines
KAMANDAG 9: VMM-364 Inserts Marines into Basco Island, Philippines
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An unarmed Minuteman III Intercontinental Ballistic Missile launches during an operational test at 12:01 Pacific Time May 21, 2025, at Vandenberg Space Force Base, Calif. Operational Test Launch GT 253 is a 'Glory Trip' for wing
Operational Test Launch GT 253 is a 'Glory Trip' for wing
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E/A-18G Growlers from the “Cougars” of Electronic Attack Squadron (VAQ) 139 fly near the aircraft carrier USS Nimitz (CVN 68) in the South China Sea, May 27, 2025. Nimitz Conducts Flight Operations
Nimitz Conducts Flight Operations
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The State Office of Veterans’ Services hosted the Governor’s Memorial Day Ceremony on May 29, 2025, at the Hawai‘i State Veterans Cemetery in Kāneʻohe, Hawaiʻi. Governor's Memorial Day Ceremony
Governor's Memorial Day Ceremony
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U.S. Marines with 3d Littoral Combat Team, 3d Marine Littoral Regiment, 3d Marine Division, engage targets during a high explosive in support of Exercise KAMANDAG 9 at Colonel Ernesto Rabina Air Base, Philippines, May 22, 2025. KAMANDAG 9: 3d LCT conducts high explosive battle drills
KAMANDAG 9: 3d LCT conducts high explosive battle drills
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U.S. Marines with 2nd Battalion, 23rd Marines, forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, set security for U.S. Army Soldiers with the 23rd Chemical Battalion during joint chemical, biological, radiological, and nuclear defense training during Korea Viper 25.4 at Camp Stanley, South Korea, May 20, 2025. Activated Reserve Marines Conduct CBRN Response Training with U.S. Army during Korea Viper 25.4
Activated Reserve Marines Conduct CBRN Response Training with U.S. Army during Korea Viper 25.4
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Two F-35B Lightning II fighter aircrafts from Marine Fighter Attack Squadron (VMFA) 242, prepare to land on the flight deck the forward-deployed amphibious assault ship USS America (LHA 6) while conducting flight operations in the East China Sea, May 20. USS America (LHA 6) Conducts Flight Operations
USS America (LHA 6) Conducts Flight Operations
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An F/A-18E Super Hornet from the “Kestrels” of Strike Fighter Squadron (VFA) 137 prepares to make an arrested landing on the flight deck of the aircraft carrier USS Nimitz (CVN 68) in the South China Sea, May 14, 2025. Nimitz Conducts Flight Operations
Nimitz Conducts Flight Operations
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Participants of the Four Chaplain Memorial Run and Ruck trek through the Norwegian Foot March course at Osan Air Base, Republic of Korea, May 17, 2025. The NFM was first held in 1915 to test the physical stamina of soldiers in the Norwegian Army and prepare them for long marches in harsh conditions. (U.S. Air Force photo by Senior Airman Sarah Williams) Four Chaplains: Norwegian Foot March
Four Chaplains: Norwegian Foot March
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U.S. Marine Corps Marines assigned to the 3rd Reconnaissance Battalion conduct a military free fall demonstration during the Japanese-American Friendship Festival 2025 at Yokota Air Base, Japan, May 18, 2025 U.S., Japan display interoperability during Friendship Jump 2025
U.S., Japan display interoperability during Friendship Jump 2025
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A U.S. Air Force C-130J Super Hercules assigned to the 36th Airlift Squadron sits on the flight line during the 2025 Japanese-American Friendship Festival fireworks display at Yokota Air Base, Japan, May 18, 2025. FF25: Blaze of Friendship
FF25: Blaze of Friendship
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The U.S. 7th Fleet flagship USS Blue Ridge (LCC 19) arrives in Wellington, New Zealand, May 16, 2025. Blue Ridge Arrives in Wellington, New Zealand for the First Time
Blue Ridge Arrives in Wellington, New Zealand for the First Time
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U.S. Marine Corps Lance Cpl. Eric Solano, an infantry rifleman with 2nd Battalion, 23rd Marines forward deployed with 4th Marine Regiment, 3d Marine Division as part of the Unit Deployment Program, conducts room clearings as a part of military operations in urban terrain training during Korea Viper 25.4 at Pohang, South Korea, May 10, 2025. Activated Reserve Marines Conduct MOUT Training during Korea Viper 25.4
Activated Reserve Marines Conduct MOUT Training during Korea Viper 25.4
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A U.S. Marine rappels during Jungle Leaders Course at the Jungle Warfare Training Center, Okinawa, Japan, May 02, 2025. U.S. Marines Execute Casualty Evacuation Training during Jungle Leaders Course
U.S. Marines Execute Casualty Evacuation Training during Jungle Leaders Course
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U.S. Marines with Baker Company, Battalion Landing Team 1st Battalion, 7th Marine Regiment, 31st Marine Expeditionary Unit, conduct paddling and broaching drills during small boat refresher course at White Beach Naval Facility, Okinawa, Japan, May 3, 2025. 31st MEU Boat Company conducts Small Boat Skills during MEUEX
31st MEU Boat Company conducts Small Boat Skills during MEUEX
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U.S. Marine Corps F-35B Lightning II aircraft with Marine Fighter Attack Squadron 211, Marine Aircraft Group 12, 1st Marine Aircraft Wing fly over Wake Island enroute to Marine Corps Air Station Iwakuni, Japan, May 10, 2025. F-35B Lightning IIs fly over Wake Island
F-35B Lightning IIs fly over Wake Island
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The Virginia-class fast-attack submarine USS Minnesota (SSN 783) transits Apra Harbor, Naval Base Guam, May 13, 2025. USS Minnesota (SSN 783) returns to Naval Base Guam
USS Minnesota (SSN 783) returns to Naval Base Guam
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Members of Explosive Ordnance Disposal Mobile Unit 11 fast-rope out of an MH-60S Sea Hawk helicopter from the “Indians” of Helicopter Sea Combat Squadron (HSC) 6 onto the flight deck of the aircraft carrier USS Nimitz (CVN 68) in the South China Sea, May 11, 2025. The Nimitz is underway in the U.S. 7th Fleet area of operations on a scheduled deployment, demonstrating the U.S. Navy's unwavering commitment to a free and open Indo-Pacific. (U.S. Navy photo by Mass Communication Specialist 2nd Class Hannah Kantner) EOD members conduct fast-rope ops onto USS Nimitz in South China Sea
EOD members conduct fast-rope ops onto USS Nimitz in South China Sea
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Balikatan 25: 3d LCT and 25th ID Conduct Counter Landing Live Fire Event with AFP Balikatan 25: 3d LCT and 25th ID Conduct Counter Landing Live Fire Event with AFP
Balikatan 25: 3d LCT and 25th ID Conduct Counter Landing Live Fire Event with AFP
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Republic of Korea Air Force Black Eagles perform aerial maneuvers during Osan Air Power Days at Osan Air Base, Republic of Korea, May 11, 2025. Their performance demonstrated expert precision flying and highlighted the strength of the U.S.-ROK partnership as thousands of attendees looked on. (U.S. Air Force photo by Senior Airman Tallon Bratton) Respect the Past, Forge the Future: Air Power Days Returns to Osan
Respect the Past, Forge the Future: Air Power Days Returns to Osan
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U.S. Marines with Animal Company, Battalion Landing Team 1st Battalion, 7th Marine Regiment, 31st Marine Expeditionary Unit, prepare to embark an MV-22B Osprey aircraft assigned to Marine Medium Tilt Rotor Squadron 265 (Rein.) during a quick response force rehearsal as a part of MEU Exercise, at Camp Hansen, Okinawa, Japan, May 3, 2025. 31st MEU conducts quick response force rehearsal for MEUEX
31st MEU conducts quick response force rehearsal for MEUEX
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Capt. Justin Eckhoff, executive officer of the aircraft carrier USS Nimitz (CVN 68), observes a replenishment-at-sea with the fleet replenishment oiler USNS John Lewis (T-AO 205) from the hangar bay of the aircraft carrier USS Nimitz (CVN 68) in the South China Sea, May 5, 2025. Nimitz Sailors Conduct a Refueling-at-Sea
Nimitz Sailors Conduct a Refueling-at-Sea
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U.S. Air Force Senior Airman Colby Delia, 9th Expeditionary Bomb Squadron crew chief, marshals a B-1B Lancer on a flight line during Bomber Task Force 25-2 at Misawa Air Base, Japan, May 3, 2025. BTF 25-2: Seventh Mission Operations
BTF 25-2: Seventh Mission Operations
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Balikatan 25: Counter Landing Live Fire Exercise Balikatan 25: Counter Landing Live Fire Exercise
Balikatan 25: Counter Landing Live Fire Exercise
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A U.S. Marine with Marine Wing Support Squadron 174, Marine Aircraft Group 24, 1st Marine Aircraft Wing, runs with a refueling hose to refuel an AH-64 Apache assigned to 2nd Squadron, 6th Cavalry Regiment, 25th Combat Aviation Brigade, 25th Infantry Division, in support of Exercise Balikatan 25, April 29, 2025. Balikatan 25: B Co. 3-25 exfils Gimlets
Balikatan 25: B Co. 3-25 exfils Gimlets
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U.S. Air Force, Navy and Army assets line the runway for an elephant walk. BH 25-2: Kadena demonstrates Indo-Pacific readiness with joint elephant walk
BH 25-2: Kadena demonstrates Indo-Pacific readiness with joint elephant walk
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An F/A-18E Super Hornet from the “Mighty Shrikes” of Strike Fighter Squadron (VFA) 94 is guided onto the catapult on the flight deck of the aircraft carrier USS Nimitz (CVN 68) in the Philippine Sea, April 30, 2025. Nimitz Conducts Flight Operations
Nimitz Conducts Flight Operations
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A Republic of Korea Air Force F-15K Slam Eagle aircraft with the 11th Fighter Wing takes off from Gwangju Air Base, South Korea, during exercise Freedom Flag 25-1, April 30, 2025. U.S. Air Force participates in Freedom Flag 25-1
U.S. Air Force participates in Freedom Flag 25-1
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A search and rescue swimmer is lifted into an MH-60S Sea Hawk helicopter from the “Indians” of Helicopter Sea Combat Squadron (HSC) 6 during training in the Philippine Sea, April 29, 2025. Nimitz Conducts Search and Rescue Training
Nimitz Conducts Search and Rescue Training
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Philippine Marines with the 3rd Marine Brigade load an M101 105mm Howitzer, a light field artillery weapon, as part of a counter landing live fire during Exercise Balikatan 25 at Rizal, Philippines, April 28, 2025. Balikatan 25: U.S., Philippine, Australian Forces Conduct Counter Landing Live Fire Exercise
Balikatan 25: U.S., Philippine, Australian Forces Conduct Counter Landing Live Fire Exercise
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U.S. Army Soldiers assigned to the 5th Battalion, 3rd Artillery Regiment, 1st Multi-Domain Task Force, staged with a U.S. Army M142 High Mobility Artillery Rocket System for a training iteration in support of Exercise Balikatan 25, in Palawan, Philippines, April 28, 2025. Staging
Staging
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U.S. Air Force Senior Airman Colby Delia, 9th Expeditionary Bomb Squadron crew chief, marshals a B-1B Lancer on a flight line during Bomber Task Force 25-2 at Misawa Air Base, Japan, May 3, 2025. MQ-9 maintainers, planners integrate during Freedom Flag 25-1
MQ-9 maintainers, planners integrate during Freedom Flag 25-1
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U.S. Marines with Marine Rotational Force – Darwin 25.3 post security during on-off drills from Royal Australian Air Force Base Darwin to Robertson Barracks, Darwin, Australia, April 29, 2025. MRF-D 25.3: Marines conduct on-off drills
MRF-D 25.3: Marines conduct on-off drills
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U.S. Air Force Air Commandos assigned to the 353rd Special Operations Wing jump from an MC-130J Commando II during static line jump training as part of Exercise Balikatan 25 at Fort Magsaysay, Philippines, April 25, 2025. Balikatan 25: 353rd SOW, Philippine Special Forces Regiment conduct static line jump training
Balikatan 25: 353rd SOW, Philippine Special Forces Regiment conduct static line jump training
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A U.S. Air Force B-1 Lancer, U.S. Air Force F-16 Fighting Falcons, and U.S. Marine Corps F/A-18 Hornets fly together with Philippine Air Force FA-50PH fighter jets during a multilateral Maritime Cooperative Activity (MCA) within the Philippines’ Exclusive Economic Zone, April 29, 2025. Australia, Philippines, and U.S. Conduct Multilateral Maritime Cooperative Activity
Australia, Philippines, and U.S. Conduct Multilateral Maritime Cooperative Activity
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U.S. Marine Corps Cpl. Tyler T. Hallman, a native of Maryland and a low altitude air gunner with 3d Littoral Anti-Air Battalion, 3d Marine Littoral Regiment, 3d Marine Division, conducts a weapons maintenance check on the Marine Air Defense Integrated System during the Integrated Air and Missile Defense event as a part of Exercise Balikatan 25, at Naval Station Leovigildo Gantioqui, Philippines, April 24, 2025. Balikatan 25: MADIS initial live fire drill
Balikatan 25: MADIS initial live fire drill
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U.S. Marines with Marine Rotational Force – Darwin 25.3 board a MV-22B Osprey during on-off drills from Royal Australian Air Force Base Darwin to Robertson Barracks, Darwin, Australia, April 29, 2025. MRF-D 25.3: Marines conduct on-off drills
MRF-D 25.3: Marines conduct on-off drills
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U.S. Marines with Medium-Range Missile Battery, 3d Marine Littoral Combat Team, 3d Marine Littoral Regiment, 3d Marine Division conduct a simulated fire-mission with the Navy-Marine Corps Expeditionary Ship Interdiction System in Basco, Philippines, April 26, 2025. Balikatan 25: Marines deploy NMESIS to Basco
Balikatan 25: Marines deploy NMESIS to Basco
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Philippine Army soldiers from the 5th and 7th Infantry Division and U.S. Soldiers assigned to the 25th Infantry Division conduct helocast training during the Jungle Operations Training Course (JOTC) at Fort Magsaysay, Philippines, April 27, 2025. Balikatan 25: JOTC Completes HELOCAST Insertion Training
Balikatan 25: JOTC Completes HELOCAST Insertion Training
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Australian soldiers with 5th/7th Battalion Royal Australian Regiment step off an MV-22B Osprey with Marine Medium Tiltrotor Squadron 364, 3rd Marine Aircraft Wing, during an air insert from Puerto Princesa, Palawan, Philippines, to Rizal in support of Exercise Balikatan 25, April 23, 2025. Balikatan 25: MRF – D 25.3, ADF conduct air insert into Rizal
Balikatan 25: MRF – D 25.3, ADF conduct air insert into Rizal
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U.S Marines aim at a target in a night shoot during a Combat Marksmanship Coaches Course at Camp Hansen, Okinawa, Japan, April 23, 2025. Night Shoot | Marines participate in a Combat Marksmanship Coaches Course
Night Shoot | Marines participate in a Combat Marksmanship Coaches Course
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A U.S. Marine Corps MK36 wrecker with Marine Air Support Squadron 2, Marine Air Control Group 18, 1st Marine Aircraft Wing pulls a Medium Tactical Vehicle Replacement on Camp Hansen, Okinawa, Japan, April 23, 2025. MASS-2 recovers tactical vehicle in rain
MASS-2 recovers tactical vehicle in rain
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A military aircraft takes off from a ship, leaving purple smoke behind against a dark sky. Nimitz Conducts Flight Operations
Nimitz Conducts Flight Operations
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A Sailor awaits confirmation to signal the seating of the catapult onto an F/A-18F Super Hornet from the "Kestrels" of Strike Fighter Squadron (VFA) 137 before launching from the flight deck of the aircraft carrier USS Nimitz (CVN 68) in the Philippine Sea, April 22, 2025. Nimitz Conducts Flight Operations
Nimitz Conducts Flight Operations
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A B-1B Lancer assigned to Dyess Air Force Base, Texas, lands at Misawa Air Base, Japan, during Bomber Task Force 25-2, April 18, 2025. B-1B Lancers arrive at Japan for BTF 25-2 Deployment
B-1B Lancers arrive at Japan for BTF 25-2 Deployment
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An F/A-18E Super Hornet from the “Blue Diamonds” of Strike Fighter Squadron (VFA) 146 launches from the flight deck of the aircraft carrier USS Nimitz (CVN 68) in the Pacific Ocean, April 22, 2025. Nimitz Conducts Flight Operations
Nimitz Conducts Flight Operations
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Eleven military aircraft of varying sizes fly in formation against a grey sky. ROK, US forces showcase airpower ahead of Freedom Flag 25-1
ROK, US forces showcase airpower ahead of Freedom Flag 25-1
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A C-130J Super Hercules equipped with external fuel tanks, assigned to the 39th Airlift Squadron, leaves for a Max Endurance Operation enroute to support Exercise Balikatan 25 at Dyess Air Force Base, Texas, April 17, 2025. Balikatan 25: 317th AW delivers varsity airlift to the Indo-Pacific
Balikatan 25: 317th AW delivers varsity airlift to the Indo-Pacific
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U.S. Marines with Maritime Raid Force, 31st Marine Expeditionary Unit, fast-rope from a U.S. Marine Corps CH-53E Super Stallion assigned to Marine Medium Tiltrotor Squadron 265 (Rein.), during alternate insertion and extraction training on Landing Zone Swallow at Camp Hansen, Okinawa, Japan, April 18, 2025. 31st MEU | Fast Rope Sustainment
31st MEU | Fast Rope Sustainment
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An F/A-18F Super Hornet from the "Fighting Redcocks" of Strike Fighter Squadron (VFA) 22 and an F/A-18E Super Hornet from the "Kestrels" of Strike Fighter Squadron (VFA) 137 fly in formation alongside the aircraft carrier USS Nimitz (CVN 68) during VFA 22’s change of command ceremony in the Pacific Ocean, April 17, 2025. Nimitz Conducts Flight Operations
Nimitz Conducts Flight Operations
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A B-1B Lancer assigned to Dyess Air Force Base, Texas, lands at Misawa Air Base, Japan, kicking off Bomber Task Force 25-2, April 15, 2025. US Airmen deploy in support of first Bomber Task Force mission to Japan
US Airmen deploy in support of first Bomber Task Force mission to Japan
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PACOM Stories

Joint Typhoon Warning Center Increases Warnings and Improves Graphics

15 December 2017

From Lieutenant Caitlin Fine

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The first warning on a Southern Hemisphere tropical cyclone was issued Nov. 29, 2017 by the Joint Typhoon Warning Center (JTWC) in Pearl Harbor, Hawaii. Dahlia (Tropical Storm 01S) was the first Southern Hemisphere system where warnings were issued every six hours without higher authority request.

Previously, manpower constraints limited updating warnings to every 12 hours but with the training of two more typhoon duty forecasters and innovative internal business practices, JTWC is now capable of six-hourly warnings regardless of their location in the ocean.

"This periodicity change of warnings specifically enables the U.S. Pacific Command and its components greater fidelity of information on systems threatening their assets, enabling better informed decisions," said Cmdr. Jillene Bushnell, the commanding officer of JTWC. "The previous gap between warnings would regularly result in larger changes in tropical cyclone fix, intensity and forecast track based on a longer interval between forecasts in a chaotic environment. Matching our forecast accuracy and periodicity throughout our assigned Pacific and Indian Ocean regions is extremely important to me."

JTWC releases warnings on tropical cyclones above 35 knot (40 mph) wind speeds in the Pacific and Indian Oceans. Products include a graphic of the tropical cyclone depicting the historical and predicted track, wind speed, and the radius of gale (34 knot), destructive (50 knot), and typhoon (64 knot) strength winds. In addition to the graphic, the products include an explanation of the current environmental situation and forecast philosophy; a text product listing the track, wind speed, and wind radii information in six hour intervals; a satellite image showing the tropical cyclone's center position at the time of the warning; and a Google Earth overlay.

During the 2016 season, JTWC warned on 20 tropical cyclones in the Southern Hemisphere. During February 2016, the strongest Southern Hemisphere tropical cyclone on record, Severe Tropical Cyclone Winston, made landfall on the islands of Fiji with winds estimated up to 185 mph by JTWC. Winston caused almost $500 million in damage and 44 deaths in Fiji, and launched a multinational relief response to help 350,000 affected residents. Upon request, JTWC issued six-hourly warnings for Tropical Cyclone Winston as it approached the islands of Fiji, providing more detailed information that improved preparation, emergency management and follow-on humanitarian assistance and disaster relief operations.

Additionally, starting in 2018 JTWC will update its wind radii colors and graphic color scheme, change the historical track character to dashed and add clarifying information in the legend. The intent is to improve the user experience and first-use understanding. The modernized warning will be issued for tropical cyclones above 25 knots in the western North Pacific Ocean and above 34 knots in the Indian and southern Pacific Oceans.

JTWC provides tropical cyclone reconnaissance, forecast, safety warning and decision support services for operational advantage to U.S. government agencies operating in the Pacific and Indian Oceans.

JTWC also provides tsunami advisory information and recommendations to shore installations and afloat units, as well as maritime impact forecast and decision support services to U.S. Pacific Command subordinate commands, as directed.

JTWC is jointly staffed by U.S. Navy and Air Force personnel and falls under the operational control of Commander, Task Force 80.7-Commander, Naval Meteorology and Oceanography Command. U.S. Air Force personnel are sourced to JTWC by the 17th Operational Weather Squadron, a subordinate squadron of the 557th Weather Wing. 

 

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