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Tropical Storm Isaias Public Advisory Number 9
2020-07-30 16:50:20| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Thu Jul 30 2020 000 WTNT34 KNHC 301450 TCPAT4 BULLETIN Tropical Storm Isaias Advisory Number 9 NWS National Hurricane Center Miami FL AL092020 1100 AM AST Thu Jul 30 2020 ...ISAIAS CONTINUES TO PRODUCE LIFE-THREATENING FLASH FLOODING AND GUSTY WINDS OVER PUERTO RICO... ....HEAVY RAINS AND GUSTY WINDS SPREADING OVER THE DOMINICAN REPUBLIC... SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION ----------------------------------------------- LOCATION...18.1N 68.9W ABOUT 50 MI...75 KM SW OF PUNTA CANA DOMINICAN REPUBLIC ABOUT 165 MI...265 KM SE OF PUERTO PLATA DOMINICAN REPUBLIC MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H PRESENT MOVEMENT...NW OR 310 DEGREES AT 20 MPH...31 KM/H MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Antigua has discontinued the Tropical Storm Warning for the British Virgin Islands. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Warning is in effect for... * Puerto Rico, Vieques, Culebra * U.S. Virgin Islands * Dominican Republic entire southern and northern coastlines * North coast of Haiti from Le Mole St Nicholas eastward to the northern border with the Dominican Republic * Turks and Caicos Islands * Southeastern Bahamas including the Acklins, Crooked Island, Long Cay, the Inaguas, Mayaguana, and the Ragged Islands * Central Bahamas, including Cat Island, the Exumas, Long Island, Rum Cay, and San Salvador A Tropical Storm Watch is in effect for... * Northwestern Bahamas including Andros Island, New Providence, Eleuthera, Abacos Islands, Berry Islands, Grand Bahamas Island, and Bimini Interests in Cuba and the Florida peninsula should monitor the progress of this system. Watches may be required for a portion of the Florida peninsula later today. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area, generally within 48 hours. For storm information specific to your area in the United States, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. For storm information specific to your area outside of the United States, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 1100 AM AST (1500 UTC), the center of Tropical Storm Isaias was located near latitude 18.1 North, longitude 68.9 West. Isaias is moving toward the northwest near 20 mph (31 km/h), and a west- northwestward to northwestward motion with some decrease in forward speed is expected over the next couple of days. On the forecast track, the center of Isaias will move over Hispaniola today and move near the Southeastern Bahamas by tonight or early Friday. Isaias is forecast to be near the Central Bahamas Friday night and approach the Northwest Bahamas or southern Florida Friday night and Saturday. Maximum sustained winds are near 60 mph (95 km/h) with higher gusts. Some slight weakening is possible as Isaias moves over Hispaniola today. Re-strengthening is forecast on Friday and Friday night. Tropical-storm-force winds extend outward up to 310 miles (500 km) primarily to the north of the center. Tropical-storm-force winds are occuring along the southern coast of Puerto Rico. A Weatherflow station at Las Mareas, Puerto Rico, reported sustained winds of 45 mph (72 km/h) with a gust to 54 mph (87 km/h). A wind gust of 60 mph (96 km/h) was recently reported at Punta Cana on the eastern tip of the Dominican Republic. The estimated minimum central pressure is 1003 mb (29.62 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Isaias can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4, WMO header WTNT44 KNHC, and on the web at www.hurricanes.gov/text/MIATCDAT4.shtml. WIND: Tropical storm conditions will continue across portions of the U.S. Virgin Islands and Puerto Rico through early afternoon. These conditions are spreading over portions of the Dominican Republic and Haiti within the warning area, and are expected to spread over the southeastern Bahamas and Turks and Caicos later today. Tropical storm conditions are expected in the Central Bahamas beginning Friday morning and are possible in the northwestern Bahamas beginning late Friday. RAINFALL: Isaias is expected to produce the following rain accumulations: Puerto Rico, Dominican Republic and northern Haiti: 4 to 8 inches, with isolated maximum totals of 10 inches. Bahamas, Turks and Caicos: 4 to 8 inches. Cuba: 1 to 2 inches, with isolated maximum totals of 4 inches. These rainfall amounts will lead to life-threatening flash flooding and mudslides, as well as river flooding. Urban and small stream flooding is expected for the U.S. Virgin Islands, eastern and southwestern Puerto Rico, and Hispaniola. Heavy rains associated with Isaias may begin to affect South Florida Saturday morning. This rain could result in isolated flash and urban flooding, especially in low-lying and poorly drained areas. SURF: Swells generated by Isaias are affecting portions of the Leeward Islands, the Virgin Islands, Puerto Rico, the Dominican Republic, the Turks and Caicos Islands and the southeastern Bahamas. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next intermediate advisory at 200 PM AST. Next complete advisory at 500 PM AST. $$ Forecaster Brown
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Tropical Storm Isaias Forecast Advisory Number 9
2020-07-30 16:50:20| National Hurricane Center (Atlantic)
Issued at 1500 UTC THU JUL 30 2020 000 WTNT24 KNHC 301450 TCMAT4 TROPICAL STORM ISAIAS FORECAST/ADVISORY NUMBER 9 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092020 1500 UTC THU JUL 30 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE GOVERNMENT OF ANTIGUA HAS DISCONTINUED THE TROPICAL STORM WARNING FOR THE BRITISH VIRGIN ISLANDS. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * PUERTO RICO...VIEQUES...CULEBRA * U.S. VIRGIN ISLANDS * DOMINICAN REPUBLIC ENTIRE SOUTHERN AND NORTHERN COASTLINES * NORTH COAST OF HAITI FROM LE MOLE ST NICHOLAS EASTWARD TO THE NORTHERN BORDER WITH THE DOMINICAN REPUBLIC * TURKS AND CAICOS ISLANDS * SOUTHEASTERN BAHAMAS INCLUDING THE ACKLINS...CROOKED ISLAND...LONG CAY...THE INAGUAS...MAYAGUANA...AND THE RAGGED ISLANDS * CENTRAL BAHAMAS...INCLUDING CAT ISLAND...THE EXUMAS...LONG ISLAND...RUM CAY...AND SAN SALVADOR A TROPICAL STORM WATCH IS IN EFFECT FOR... * NORTHWESTERN BAHAMAS INCLUDING ANDROS ISLAND...NEW PROVIDENCE...ELEUTHERA...ABACOS ISLANDS...BERRY ISLANDS...GRAND BAHAMAS ISLAND...AND BIMINI INTERESTS IN CUBA AND THE FLORIDA PENINSULA SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. WATCHES MAY BE REQUIRED FOR A PORTION OF THE FLORIDA PENINSULA LATER TODAY. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA WITHIN 36 HOURS. A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA...GENERALLY WITHIN 48 HOURS. TROPICAL STORM CENTER LOCATED NEAR 18.1N 68.9W AT 30/1500Z POSITION ACCURATE WITHIN 75 NM PRESENT MOVEMENT TOWARD THE NORTHWEST OR 310 DEGREES AT 17 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1003 MB MAX SUSTAINED WINDS 50 KT WITH GUSTS TO 60 KT. 50 KT....... 80NE 0SE 0SW 0NW. 34 KT.......270NE 90SE 0SW 210NW. 12 FT SEAS..420NE 0SE 0SW 360NW. WINDS AND SEAS VARY GREATLY IN EACH QUADRANT. RADII IN NAUTICAL MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT. REPEAT...CENTER LOCATED NEAR 18.1N 68.9W AT 30/1500Z AT 30/1200Z CENTER WAS LOCATED NEAR 17.7N 68.5W FORECAST VALID 31/0000Z 19.7N 71.4W...INLAND MAX WIND 45 KT...GUSTS 55 KT. 34 KT...210NE 90SE 0SW 160NW. FORECAST VALID 31/1200Z 21.4N 74.2W...OVER WATER MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 40NE 0SE 0SW 0NW. 34 KT...180NE 90SE 0SW 150NW. FORECAST VALID 01/0000Z 23.0N 76.5W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 40NE 20SE 0SW 0NW. 34 KT...140NE 90SE 30SW 90NW. FORECAST VALID 01/1200Z 24.6N 78.2W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 20SE 0SW 20NW. 34 KT...120NE 90SE 50SW 90NW. FORECAST VALID 02/0000Z 26.2N 79.4W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 30SE 20SW 20NW. 34 KT...120NE 90SE 50SW 70NW. FORECAST VALID 02/1200Z 28.0N 79.9W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 40NE 30SE 20SW 20NW. 34 KT...120NE 90SE 50SW 60NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 03/1200Z 31.5N 79.1W MAX WIND 60 KT...GUSTS 75 KT. OUTLOOK VALID 04/1200Z 37.5N 73.5W MAX WIND 60 KT...GUSTS 75 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 18.1N 68.9W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 30/1800Z NEXT ADVISORY AT 30/2100Z $$ FORECASTER BROWN
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Tropical Storm Isaias Graphics
2020-07-30 10:53:46| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Thu, 30 Jul 2020 08:53:46 GMT Wind Speed Probabilities last updated Thu, 30 Jul 2020 08:53:46 GMT
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Tropical Storm Isaias Forecast Discussion Number 8
2020-07-30 10:52:45| National Hurricane Center (Atlantic)
Issued at 500 AM AST Thu Jul 30 2020 000 WTNT44 KNHC 300852 TCDAT4 Tropical Storm Isaias Discussion Number 8 NWS National Hurricane Center Miami FL AL092020 500 AM AST Thu Jul 30 2020 Isaias is sending some mixed signals tonight. The 1-min rapid scan data from GOES-16 indicates that the low-level center is likely displaced west of a very intense burst of deep convection on the northeastern side of the circulation. However, the satellite data also shows increased banding features overnight and a more organized central cloud pattern, with recent hints that perhaps a low-level center is trying to re-form closer to the convection. Radar observations from San Juan show 60-65 kt Doppler wind velocities during the past few hours near 5000 ft, so the initial wind speed is raised to 50 kt. Model forecasts are showing a complex evolution of the tropical cyclone during the next day or two. There is good agreement that Isaias will move across Hispaniola later today, and its low-level center will likely become disorganized over the high terrain. However, the strong burst of convection currently near Puerto Rico is associated with a mid-level circulation, which should pass along the north coast of Hispaniola later today. Most of the model guidance suggest that this feature will cause the re-development of a surface center over the northern part of the broader system while the mid-level circulation moves close to the southeastern Bahamas. Afterward, the cyclone would then move northwestward until the weekend, and gradually turn northward and northeastward close to the U.S. East Coast into early next week ahead of a mid-latitude trough. The official track forecast is a little to the east of the previous one and close to the NOAA corrected dynamical model consensus. It should be noted that further adjustments to the forecast tracks are indeed possible, especially after Isaias moves north of Hispaniola. The intensity forecast is quite tricky. In the short term, Isaias is expected to move across Hispaniola, as the storm's interaction with the mountainous island should cause some weakening and disruption to the circulation. However, as mentioned before, the models suggest that a new center could form, and the environmental conditions would support gradual intensification. The intensity models have been trending higher, and the official forecast is nudged upward accordingly, now showing a peak intensity of 60 kt when the storm is near the coast of Florida and the Southeast U.S. Coast. It should be noted that there are models that show hurricane strength near the U.S. but, given the large amount of uncertainty, it is preferred to stay on the conservative side for now. We should have a better idea of how strong Isaias will become near the U.S. after reconnaissance aircraft sample the storm and after it passes Hispaniola later today. Key Messages: 1. Isaias will produce heavy rains and potentially life-threatening flash flooding and mudslides across the Virgin Islands, Puerto Rico, the Dominican Republic, northern Haiti, and over the Bahamas. 2. Tropical storm conditions are likely across portions of the the Virgin Islands, and Puerto Rico through this morning and will spread westward to portions of the Dominican Republic, Haiti, and the Turks and Caicos and the Bahamas later today and Friday. Tropical Storm Warnings are in effect for these areas. Do not focus on the details of the track forecast, as rainfall and wind hazards will extend far from the center of the system. 3. While this system could bring some rainfall and wind impacts to portions of Cuba and Florida later this week and this weekend, it is too soon to determine the location or magnitude of those impacts. Interests there should monitor the progress of this system and updates to the forecast over the next couple of days. FORECAST POSITIONS AND MAX WINDS INIT 30/0900Z 17.2N 67.9W 50 KT 60 MPH 12H 30/1800Z 18.8N 70.2W 45 KT 50 MPH...INLAND 24H 31/0600Z 20.6N 72.9W 45 KT 50 MPH...OVER WATER 36H 31/1800Z 22.3N 75.5W 50 KT 60 MPH 48H 01/0600Z 24.0N 77.9W 55 KT 65 MPH 60H 01/1800Z 25.5N 79.2W 60 KT 70 MPH 72H 02/0600Z 27.3N 80.0W 60 KT 70 MPH 96H 03/0600Z 31.0N 80.0W 60 KT 70 MPH 120H 04/0600Z 37.0N 74.5W 60 KT 70 MPH $$ Forecaster Blake/Cangialosi
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Summary for Tropical Storm Isaias (AT4/AL092020)
2020-07-30 10:47:15| National Hurricane Center (Atlantic)
...ISAIAS CAUSING HEAVY RAINS AND HIGH WINDS OVER PUERTO RICO... As of 5:00 AM AST Thu Jul 30 the center of Isaias was located near 17.2, -67.9 with movement NW at 21 mph. The minimum central pressure was 1003 mb with maximum sustained winds of about 60 mph.
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