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Tropical Storm Iota Public Advisory Number 4

2020-11-14 09:39:00| National Hurricane Center (Atlantic)

Issued at 400 AM EST Sat Nov 14 2020 000 WTNT31 KNHC 140838 TCPAT1 BULLETIN Tropical Storm Iota Advisory Number 4 NWS National Hurricane Center Miami FL AL312020 400 AM EST Sat Nov 14 2020 ...IOTA MOVING SLOWLY WEST-SOUTHWESTWARD AND FORECAST TO STRENGTHEN... ...RISK OF DANGEROUS WINDS, STORM SURGE, AND RAINFALL IMPACTS IN CENTRAL AMERICA BEGINNING MONDAY... SUMMARY OF 400 AM EST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...13.5N 74.8W ABOUT 340 MI...545 KM SSE OF KINGSTON JAMAICA ABOUT 570 MI...920 KM E OF CABO GRACIAS A DIOS ON NIC/HON BORDER MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...WSW OR 245 DEGREES AT 5 MPH...7 KM/H MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES WATCHES AND WARNINGS -------------------- There are no coastal watches or warnings in effect. Interests in Nicaragua and Honduras should monitor the progress of Iota, and a Hurricane Watch will likely be issued later today for portions of these countries. Interests in San Andres and Providencia should also monitor the progress of this system. DISCUSSION AND OUTLOOK ---------------------- At 400 AM EST (0900 UTC), the center of Tropical Storm Iota was located near latitude 13.5 North, longitude 74.8 West. Iota is moving toward the west-southwest near 5 mph (7 km/h). A westward motion with some increase in forward speed is expected to begin later today and continue through Monday. On the forecast track, Iota will move across the central Caribbean Sea during the next day or so, and approach the coasts of Nicaragua and northeastern Honduras on Monday. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Steady to rapid strengthening is likely over the weekend, and Iota is forecast to be a major hurricane when it approaches Central America. Tropical-storm-force winds extend outward up to 90 miles (150 km) to the northeast of the center. The estimated minimum central pressure is 1005 mb (29.68 inches). HAZARDS AFFECTING LAND ---------------------- Rainfall: Iota is expected to produce the following rainfall accumulations through Wednesday: Honduras, northern Nicaragua, eastern Guatemala, southern Belize: 8 to 16 inches (200 to 400 mm). Isolated maximum totals of 20-30 inches (500 to 750 mm) will be possible, especially from northeast Nicaragua into northern Honduras. Costa Rica, Panama, and northern Colombia: 4 to 8 inches (100 to 200 mm), with isolated maximum totals of 12 inches (300 mm). This rainfall would lead to significant, life-threatening flash flooding and river flooding, along with mudslides in areas of higher terrain. El Salvador and southern Nicaragua: 2 to 4 inches (50 to 100 mm), with isolated maximum totals of 6 inches (150 mm). Jamaica: 1 to 3 inches (25 to 75 mm). SURF: Swells generated by Iota will affect portions of the coast of Colombia, and the southern coasts of Hispaniola and Jamaica during the next day or two. Swells will begin to reach the coasts of Nicaragua and Honduras on Monday. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. NEXT ADVISORY ------------- Next complete advisory at 1000 AM EST. $$ Forecaster Beven

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Tropical Storm Iota Wind Speed Probabilities Number 4

2020-11-14 09:39:00| National Hurricane Center (Atlantic)

Issued at 0900 UTC SAT NOV 14 2020 000 FONT11 KNHC 140838 PWSAT1 TROPICAL STORM IOTA WIND SPEED PROBABILITIES NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL312020 0900 UTC SAT NOV 14 2020 AT 0900Z THE CENTER OF TROPICAL STORM IOTA WAS LOCATED NEAR LATITUDE 13.5 NORTH...LONGITUDE 74.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 35 KTS...40 MPH...65 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN STANDARD TIME (EST)...SUBTRACT 5 HOURS FROM Z TIME CENTRAL STANDARD TIME (CST)...SUBTRACT 6 HOURS FROM Z TIME WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST ...34 KT (39 MPH... 63 KM/H)... ...50 KT (58 MPH... 93 KM/H)... ...64 KT (74 MPH...119 KM/H)... FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 06Z SAT AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) PROBABILITIES ARE GIVEN IN PERCENT X INDICATES PROBABILITIES LESS THAN 1 PERCENT PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY 64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT. - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - FROM FROM FROM FROM FROM FROM FROM TIME 06Z SAT 18Z SAT 06Z SUN 18Z SUN 06Z MON 06Z TUE 06Z WED PERIODS TO TO TO TO TO TO TO 18Z SAT 06Z SUN 18Z SUN 06Z MON 06Z TUE 06Z WED 06Z THU FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT COZUMEL MX 34 X X( X) X( X) X( X) 1( 1) 2( 3) 2( 5) BELIZE CITY 34 X X( X) X( X) X( X) 3( 3) 12(15) 6(21) BELIZE CITY 50 X X( X) X( X) X( X) X( X) 4( 4) 3( 7) BELIZE CITY 64 X X( X) X( X) X( X) X( X) 2( 2) 1( 3) PUERTO BARRIOS 34 X X( X) X( X) X( X) 3( 3) 13(16) 9(25) PUERTO BARRIOS 50 X X( X) X( X) X( X) 1( 1) 3( 4) 4( 8) PUERTO BARRIOS 64 X X( X) X( X) X( X) X( X) 1( 1) 1( 2) GUANAJA 34 X X( X) X( X) 1( 1) 20(21) 20(41) 8(49) GUANAJA 50 X X( X) X( X) X( X) 7( 7) 11(18) 5(23) GUANAJA 64 X X( X) X( X) X( X) 3( 3) 8(11) 3(14) PUERTO CABEZAS 34 X X( X) X( X) 4( 4) 35(39) 13(52) 2(54) PUERTO CABEZAS 50 X X( X) X( X) X( X) 20(20) 8(28) 1(29) PUERTO CABEZAS 64 X X( X) X( X) X( X) 9( 9) 5(14) 1(15) BLUEFIELDS 34 X X( X) X( X) 1( 1) 7( 8) 7(15) 1(16) BLUEFIELDS 50 X X( X) X( X) X( X) 1( 1) 2( 3) 1( 4) BLUEFIELDS 64 X X( X) X( X) X( X) 1( 1) X( 1) X( 1) SAN ANDRES 34 X X( X) 3( 3) 6( 9) 15(24) 5(29) 1(30) SAN ANDRES 50 X X( X) X( X) 2( 2) 6( 8) 2(10) X(10) SAN ANDRES 64 X X( X) X( X) X( X) 4( 4) X( 4) X( 4) LIMON 34 X X( X) X( X) 1( 1) 2( 3) 3( 6) X( 6) GRAND CAYMAN 34 X X( X) 1( 1) 2( 3) 6( 9) 2(11) 1(12) MONTEGO BAY 34 X 1( 1) 2( 3) 2( 5) 2( 7) 1( 8) X( 8) KINGSTON 34 X 1( 1) 2( 3) 2( 5) 1( 6) 1( 7) X( 7) $$ FORECASTER BEVEN

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Tropical Storm Iota Forecast Advisory Number 4

2020-11-14 09:38:29| National Hurricane Center (Atlantic)

Issued at 0900 UTC SAT NOV 14 2020 000 WTNT21 KNHC 140838 TCMAT1 TROPICAL STORM IOTA FORECAST/ADVISORY NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL312020 0900 UTC SAT NOV 14 2020 THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. INTERESTS IN NICARAGUA AND HONDURAS SHOULD MONITOR THE PROGRESS OF IOTA...AND A HURRICANE WATCH WILL LIKELY BE ISSUED LATER TODAY FOR PORTIONS OF THESE COUNTRIES. INTERESTS IN SAN ANDRES AND PROVIDENCIA SHOULD ALSO MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL STORM CENTER LOCATED NEAR 13.5N 74.8W AT 14/0900Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST-SOUTHWEST OR 245 DEGREES AT 4 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 80NE 0SE 0SW 0NW. 12 FT SEAS.. 60NE 0SE 0SW 45NW. 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 13.5N 74.8W AT 14/0900Z AT 14/0600Z CENTER WAS LOCATED NEAR 13.6N 74.5W FORECAST VALID 14/1800Z 13.6N 75.4W MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 80NE 80SE 0SW 60NW. FORECAST VALID 15/0600Z 13.9N 76.8W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 30NE 30SE 0SW 0NW. 34 KT... 90NE 80SE 30SW 80NW. FORECAST VALID 15/1800Z 14.3N 78.6W MAX WIND 70 KT...GUSTS 85 KT. 64 KT... 20NE 20SE 0SW 0NW. 50 KT... 40NE 40SE 0SW 30NW. 34 KT...100NE 90SE 50SW 90NW. FORECAST VALID 16/0600Z 14.5N 80.4W MAX WIND 85 KT...GUSTS 105 KT. 64 KT... 20NE 20SE 10SW 15NW. 50 KT... 40NE 40SE 20SW 40NW. 34 KT...110NE 90SE 40SW 100NW. FORECAST VALID 16/1800Z 14.8N 82.0W MAX WIND 100 KT...GUSTS 120 KT. 50 KT... 40NE 40SE 30SW 40NW. 34 KT...120NE 90SE 60SW 110NW. FORECAST VALID 17/0600Z 14.9N 83.3W...INLAND MAX WIND 105 KT...GUSTS 130 KT. 50 KT... 50NE 50SE 30SW 40NW. 34 KT...140NE 100SE 60SW 120NW. 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 18/0600Z 14.5N 86.0W...INLAND MAX WIND 50 KT...GUSTS 60 KT. OUTLOOK VALID 19/0600Z 14.0N 89.0W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.5N 74.8W NEXT ADVISORY AT 14/1500Z $$ FORECASTER BEVEN

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Tropical Storm Theta Graphics

2020-11-14 09:37:59| National Hurricane Center (Atlantic)

5-Day Uncertainty Track last updated Sat, 14 Nov 2020 08:37:59 GMT Wind Speed Probabilities last updated Sat, 14 Nov 2020 08:37:59 GMT

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Tropical Storm Theta Forecast Discussion Number 18

2020-11-14 09:36:56| National Hurricane Center (Atlantic)

Issued at 900 AM GMT Sat Nov 14 2020 806 WTNT45 KNHC 140836 TCDAT5 Tropical Storm Theta Discussion Number 18 NWS National Hurricane Center Miami FL AL302020 900 AM GMT Sat Nov 14 2020 Nearly all of the deep convection associated with Theta has dissipated since the previous advisory, with only cold, high cirrus clouds remaining in the northeastern quadrant. A late-arriving 13/2255Z partial ASCAT-C pass indicated a few 35-kt wind vectors were present in the southeastern quadrant, so the initial intensity has been lowered to 35 kt for this advisory, which is consistent the latest TAFB current intensity estimate of T2.5/35 kt. The initial motion estimate is due east, or 090/08 kt. Theta is expected to move eastward along the northern periphery of a deep-layer ridge for the next 24 hours or so, a motion that will also be accompanied by a gradual decrease in forward speed. By 36 hours, a much weaker and more vertically shallow Theta is forecast to turn sharply northward ahead of a frontal system. In the 48-72 hour period, the weakening cyclone expected to accelerate northeastward ahead of the front, passing to the north of the Canary Islands this weekend. Theta is forecast to dissipate by 96 hours near the Madeira Island. The new NHC track forecast is similar to the previous advisory, and lies close to the consensus model TVCN. Strong shear in excess of 35 kt currently affecting Theta is forecast to steadily increase to more than 40 kt by 12 h and beyond. In addition, entrainment of very dry mid-level air should combine with the increasing shear and prevent the reformation of persistent organized deep convection near the center. Although the global models show that some marginal instability is expected to linger through the forecast period, only intermittent small bursts of modest convection away from the center could develop. However, the general trend in the model guidance calls for Theta to slowly spin down, and the official intensity forecast follows that scenario, calling for the cyclone to weaken to a remnant low later today, then becoming extratropical before dissipating in 3-4 days. FORECAST POSITIONS AND MAX WINDS INIT 14/0900Z 32.0N 20.8W 35 KT 40 MPH 12H 14/1800Z 31.8N 19.5W 30 KT 35 MPH...POST-TROP/REMNT LOW 24H 15/0600Z 31.8N 18.3W 30 KT 35 MPH...POST-TROP/EXTRATROP 36H 15/1800Z 32.2N 17.7W 25 KT 30 MPH...POST-TROP/EXTRATROP 48H 16/0600Z 33.2N 17.4W 20 KT 25 MPH...POST-TROP/EXTRATROP 60H 16/1800Z 34.9N 16.6W 20 KT 25 MPH...POST-TROP/EXTRATROP 72H 17/0600Z 37.2N 15.6W 20 KT 25 MPH...POST-TROP/EXTRATROP 96H 18/0600Z...DISSIPATED $$ Forecaster Stewart

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