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Hurricane Irma Forecast Discussion Number 24
2017-09-05 10:49:05| National Hurricane Center (Atlantic)
Issued at 500 AM AST Tue Sep 05 2017 000 WTNT41 KNHC 050848 TCDAT1 Hurricane Irma Discussion Number 24 NWS National Hurricane Center Miami FL AL112017 500 AM AST Tue Sep 05 2017 The cloud pattern on satellite is spectacular with a clear eye surrounded by a ring of very deep convection. An Air Force plane was in the eye of the hurricane a few hours ago and measured surface winds of 126 kt with the SFMR. Since the plane left, the could pattern has become even more impressive and objective T-numbers have been oscillating around 7.0 on the Dvorak scale. Based on the average of these estimates, the initial intensity is adjusted upward to 130 kt. The hurricane will be moving through an environment of low vertical wind shear, a moist mid-level atmosphere, and increasing upper-ocean heat content, and this is ideal for some additional intensification. However, given that the SHIPS models do not show any significant change in the intensity, the NHC forecast keeps Irma a powerful hurricane through five days. Recon and satellite fixes indicate that Irma is moving toward the west or 270 degrees at 12 kt. The hurricane is moving around the periphery of the Atlantic subtropical ridge, which in fact is quite strong at this time. This persistent pattern should keep Irma on a general westward track for the next 24 hours, with a west-northwest track thereafter. The guidance envelope and many of the ensemble members of the GFS and the ECMWF models have shifted slightly westward since the previous run. The NHC forecast also shifted slightly westward, and it is on top of the multi-model consensus. The confidence in the forecast beyond 3 days is lower, since the guidance spreads out more. Users are reminded to not focus on the exact forecast track, especially at the longer ranges, since the average NHC track errors are about 175 and 225 statute miles at days 4 and 5, respectively. KEY MESSAGES: 1. Irma is expected to affect the northeastern Leeward Islands as a dangerous major hurricane, accompanied by life-threatening wind, storm surge, and rainfall impacts. Hurricane warnings are in effect for portions of the Leeward Islands. Preparations should be rushed to completion, as tropical-storm force winds are expected to first arrive in the hurricane warning area later today. 2. Irma is also expected to affect the British and U.S. Virgin Islands and Puerto Rico as a dangerous major hurricane later this week. Hurricane warnings have been issued for these areas, and tropical-storm-force winds could arrive in these areas by early Wednesday. 3. Irma could directly affect Hispaniola, the Turks and Caicos, the Bahamas, and Cuba as a dangerous major hurricane later this week. Residents in these areas should monitor the progress of Irma and listen to advice given by officials. 4. There is an increasing chance of seeing some impacts from Irma in the Florida Peninsula and the Florida Keys later this week and this weekend. Otherwise, it is still too early to determine what direct impacts Irma might have on the continental United States. However, everyone in hurricane-prone areas should ensure that they have their hurricane plan in place. FORECAST POSITIONS AND MAX WINDS INIT 05/0900Z 16.6N 57.0W 130 KT 150 MPH 12H 05/1800Z 17.0N 58.9W 130 KT 150 MPH 24H 06/0600Z 17.7N 61.5W 130 KT 150 MPH 36H 06/1800Z 18.6N 64.2W 130 KT 150 MPH 48H 07/0600Z 19.6N 67.0W 125 KT 145 MPH 72H 08/0600Z 21.2N 72.5W 120 KT 140 MPH 96H 09/0600Z 22.4N 77.2W 115 KT 130 MPH 120H 10/0600Z 24.0N 81.0W 115 KT 130 MPH $$ Forecaster Avila
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Hurricane Irma Wind Speed Probabilities Number 24
2017-09-05 10:47:40| National Hurricane Center (Atlantic)
Issued at 0900 UTC TUE SEP 05 2017 000 FONT11 KNHC 050847 PWSAT1 HURRICANE IRMA WIND SPEED PROBABILITIES NUMBER 24 NWS NATIONAL HURRICANE CENTER MIAMI FL AL112017 0900 UTC TUE SEP 05 2017 AT 0900Z THE CENTER OF HURRICANE IRMA WAS LOCATED NEAR LATITUDE 16.6 NORTH...LONGITUDE 57.0 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 130 KTS...150 MPH...240 KM/H. Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 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 TUE 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 TUE 18Z TUE 06Z WED 18Z WED 06Z THU 06Z FRI 06Z SAT PERIODS TO TO TO TO TO TO TO 18Z TUE 06Z WED 18Z WED 06Z THU 06Z FRI 06Z SAT 06Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT KINGS BAY GA 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) WAYCROSS GA 34 X X( X) X( X) X( X) X( X) X( X) 3( 3) MAYPORT NS FL 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) JACKSONVILLE 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) GAINESVILLE FL 34 X X( X) X( X) X( X) X( X) X( X) 9( 9) DAYTONA BEACH 34 X X( X) X( X) X( X) X( X) 1( 1) 11(12) DAYTONA BEACH 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) DAYTONA BEACH 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) THE VILLAGES 34 X X( X) X( X) X( X) X( X) 1( 1) 13(14) THE VILLAGES 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) ORLANDO FL 34 X X( X) X( X) X( X) X( X) 2( 2) 16(18) ORLANDO FL 50 X X( X) X( X) X( X) X( X) X( X) 4( 4) ORLANDO FL 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) COCOA BEACH FL 34 X X( X) X( X) X( X) X( X) 3( 3) 17(20) COCOA BEACH FL 50 X X( X) X( X) X( X) X( X) X( X) 5( 5) COCOA BEACH FL 64 X X( X) X( X) X( X) X( X) X( X) 2( 2) PATRICK AFB 34 X X( X) X( X) X( X) X( X) 3( 3) 17(20) PATRICK AFB 50 X X( X) X( X) X( X) X( X) X( X) 5( 5) PATRICK AFB 64 X X( X) X( X) X( X) X( X) X( X) 2( 2) FT PIERCE FL 34 X X( X) X( X) X( X) X( X) 6( 6) 22(28) FT PIERCE FL 50 X X( X) X( X) X( X) X( X) 1( 1) 7( 8) FT PIERCE FL 64 X X( X) X( X) X( X) X( X) X( X) 4( 4) W PALM BEACH 34 X X( X) X( X) X( X) X( X) 10(10) 29(39) W PALM BEACH 50 X X( X) X( X) X( X) X( X) 1( 1) 12(13) W PALM BEACH 64 X X( X) X( X) X( X) X( X) X( X) 7( 7) FT LAUDERDALE 34 X X( X) X( X) X( X) X( X) 13(13) 33(46) FT LAUDERDALE 50 X X( X) X( X) X( X) X( X) 2( 2) 20(22) FT LAUDERDALE 64 X X( X) X( X) X( X) X( X) X( X) 9( 9) MIAMI FL 34 X X( X) X( X) X( X) X( X) 14(14) 37(51) MIAMI FL 50 X X( X) X( X) X( X) X( X) 3( 3) 22(25) MIAMI FL 64 X X( X) X( X) X( X) X( X) 1( 1) 11(12) HOMESTEAD ARB 34 X X( X) X( X) X( X) X( X) 15(15) 39(54) HOMESTEAD ARB 50 X X( X) X( X) X( X) X( X) 4( 4) 24(28) HOMESTEAD ARB 64 X X( X) X( X) X( X) X( X) 2( 2) 13(15) MARATHON FL 34 X X( X) X( X) X( X) X( X) 14(14) 42(56) MARATHON FL 50 X X( X) X( X) X( X) X( X) 4( 4) 28(32) MARATHON FL 64 X X( X) X( X) X( X) X( X) 2( 2) 17(19) KEY WEST FL 34 X X( X) X( X) X( X) X( X) 10(10) 40(50) KEY WEST FL 50 X X( X) X( X) X( X) X( X) 3( 3) 27(30) KEY WEST FL 64 X X( X) X( X) X( X) X( X) 1( 1) 17(18) NAPLES FL 34 X X( X) X( X) X( X) X( X) 6( 6) 37(43) NAPLES FL 50 X X( X) X( X) X( X) X( X) 1( 1) 16(17) NAPLES FL 64 X X( X) X( X) X( X) X( X) X( X) 8( 8) FT MYERS FL 34 X X( X) X( X) X( X) X( X) 5( 5) 32(37) FT MYERS FL 50 X X( X) X( X) X( X) X( X) X( X) 14(14) FT MYERS FL 64 X X( X) X( X) X( X) X( X) X( X) 6( 6) VENICE FL 34 X X( X) X( X) X( X) X( X) 2( 2) 27(29) VENICE FL 50 X X( X) X( X) X( X) X( X) X( X) 10(10) VENICE FL 64 X X( X) X( X) X( X) X( X) X( X) 4( 4) TAMPA FL 34 X X( X) X( X) X( X) X( X) 1( 1) 20(21) TAMPA FL 50 X X( X) X( X) X( X) X( X) X( X) 5( 5) TAMPA FL 64 X X( X) X( X) X( X) X( X) X( X) 2( 2) CEDAR KEY FL 34 X X( X) X( X) X( X) X( X) X( X) 11(11) CEDAR KEY FL 50 X X( X) X( X) X( X) X( X) X( X) 2( 2) CEDAR KEY FL 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) TALLAHASSEE FL 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) ST MARKS FL 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) APALACHICOLA 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) GFMX 290N 850W 34 X X( X) X( X) X( X) X( X) X( X) 8( 8) GFMX 290N 850W 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) GFMX 290N 850W 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) PANAMA CITY FL 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) GFMX 290N 870W 34 X X( X) X( X) X( X) X( X) X( X) 6( 6) GFMX 280N 890W 34 X X( X) X( X) X( X) X( X) X( X) 3( 3) COZUMEL MX 34 X X( X) X( X) X( X) X( X) X( X) 3( 3) GRAND BAHAMA 34 X X( X) X( X) X( X) X( X) 14(14) 23(37) GRAND BAHAMA 50 X X( X) X( X) X( X) X( X) 3( 3) 11(14) GRAND BAHAMA 64 X X( X) X( X) X( X) X( X) 1( 1) 6( 7) NEW PROVIDENCE 34 X X( X) X( X) X( X) 1( 1) 36(37) 20(57) NEW PROVIDENCE 50 X X( X) X( X) X( X) X( X) 14(14) 13(27) NEW PROVIDENCE 64 X X( X) X( X) X( X) X( X) 6( 6) 8(14) ANDROS 34 X X( X) X( X) X( X) 1( 1) 52(53) 18(71) ANDROS 50 X X( X) X( X) X( X) X( X) 25(25) 18(43) ANDROS 64 X X( X) X( X) X( X) X( X) 15(15) 11(26) GREAT EXUMA 34 X X( X) X( X) X( X) 11(11) 58(69) 7(76) GREAT EXUMA 50 X X( X) X( X) X( X) 1( 1) 38(39) 7(46) GREAT EXUMA 64 X X( X) X( X) X( X) X( X) 24(24) 5(29) SAN SALVADOR 34 X X( X) X( X) X( X) 18(18) 39(57) 4(61) SAN SALVADOR 50 X X( X) X( X) X( X) 3( 3) 24(27) 2(29) SAN SALVADOR 64 X X( X) X( X) X( X) 1( 1) 14(15) 1(16) MAYAGUANA 34 X X( X) X( X) X( X) 61(61) 21(82) X(82) MAYAGUANA 50 X X( X) X( X) X( X) 32(32) 24(56) X(56) MAYAGUANA 64 X X( X) X( X) X( X) 16(16) 18(34) X(34) GRAND TURK 34 X X( X) X( X) 4( 4) 81(85) 2(87) X(87) GRAND TURK 50 X X( X) X( X) X( X) 61(61) 4(65) X(65) GRAND TURK 64 X X( X) X( X) X( X) 41(41) 4(45) X(45) CP SAN ANTONIO 34 X X( X) X( X) X( X) X( X) X( X) 11(11) CP SAN ANTONIO 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) CP SAN ANTONIO 64 X X( X) X( X) X( X) X( X) X( X) 2( 2) HAVANA 34 X X( X) X( X) X( X) X( X) 5( 5) 33(38) HAVANA 50 X X( X) X( X) X( X) X( X) 1( 1) 14(15) HAVANA 64 X X( X) X( X) X( X) X( X) 1( 1) 6( 7) ISLE OF PINES 34 X X( X) X( X) X( X) X( X) 3( 3) 17(20) ISLE OF PINES 50 X X( X) X( X) X( X) X( X) X( X) 8( 8) ISLE OF PINES 64 X X( X) X( X) X( X) X( X) X( X) 4( 4) CIENFUEGOS 34 X X( X) X( X) X( X) X( X) 19(19) 28(47) CIENFUEGOS 50 X X( X) X( X) X( X) X( X) 4( 4) 14(18) CIENFUEGOS 64 X X( X) X( X) X( X) X( X) 1( 1) 7( 8) CAMAGUEY 34 X X( X) X( X) X( X) 2( 2) 43(45) 12(57) CAMAGUEY 50 X X( X) X( X) X( X) X( X) 20(20) 10(30) CAMAGUEY 64 X X( X) X( X) X( X) X( X) 8( 8) 6(14) GUANTANAMO BAY 34 X X( X) X( X) X( X) 18(18) 27(45) 2(47) GUANTANAMO BAY 50 X X( X) X( X) X( X) 5( 5) 16(21) X(21) GUANTANAMO BAY 64 X X( X) X( X) X( X) 1( 1) 10(11) X(11) GRAND CAYMAN 34 X X( X) X( X) X( X) X( X) 3( 3) 7(10) GRAND CAYMAN 50 X X( X) X( X) X( X) X( X) 1( 1) 2( 3) GRAND CAYMAN 64 X X( X) X( X) X( X) X( X) X( X) 1( 1) MONTEGO BAY 34 X X( X) X( X) X( X) 1( 1) 8( 9) 3(12) MONTEGO BAY 50 X X( X) X( X) X( X) X( X) 3( 3) X( 3) MONTEGO BAY 64 X X( X) X( X) X( X) X( X) 1( 1) X( 1) KINGSTON 34 X X( X) X( X) X( X) 2( 2) 6( 8) 1( 9) LES CAYES 34 X X( X) X( X) X( X) 12(12) 6(18) 1(19) LES CAYES 50 X X( X) X( X) X( X) 3( 3) 2( 5) X( 5) LES CAYES 64 X X( X) X( X) X( X) 1( 1) 1( 2) X( 2) PORT-AU-PRINCE 34 X X( X) X( X) 1( 1) 23(24) 5(29) X(29) PORT-AU-PRINCE 50 X X( X) X( X) X( X) 7( 7) 1( 8) X( 8) PORT-AU-PRINCE 64 X X( X) X( X) X( X) 2( 2) 1( 3) X( 3) CAPE BEATA 34 X X( X) X( X) 2( 2) 10(12) 1(13) X(13) CAPE BEATA 50 X X( X) X( X) X( X) 3( 3) X( 3) X( 3) CAPE BEATA 64 X X( X) X( X) X( X) 1( 1) X( 1) X( 1) PUERTO PLATA 34 X X( X) X( X) 7( 7) 65(72) 1(73) X(73) PUERTO PLATA 50 X X( X) X( X) X( X) 47(47) 1(48) X(48) PUERTO PLATA 64 X X( X) X( X) X( X) 29(29) 1(30) X(30) SANTO DOMINGO 34 X X( X) 1( 1) 10(11) 32(43) 1(44) X(44) SANTO DOMINGO 50 X X( X) X( X) 1( 1) 14(15) X(15) X(15) SANTO DOMINGO 64 X X( X) X( X) X( X) 5( 5) 1( 6) X( 6) PONCE PR 34 X 1( 1) 17(18) 43(61) 2(63) X(63) X(63) PONCE PR 50 X X( X) 3( 3) 25(28) 1(29) X(29) X(29) PONCE PR 64 X X( X) 1( 1) 10(11) 2(13) X(13) X(13) AGUADILLA PR 34 X X( X) 10(10) 57(67) 4(71) X(71) X(71) AGUADILLA PR 50 X X( X) 1( 1) 34(35) 6(41) X(41) X(41) AGUADILLA PR 64 X X( X) X( X) 18(18) 3(21) X(21) X(21) SAN JUAN PR 34 X 2( 2) 38(40) 44(84) X(84) X(84) X(84) SAN JUAN PR 50 X X( X) 9( 9) 49(58) X(58) X(58) X(58) SAN JUAN PR 64 X X( X) 2( 2) 32(34) 1(35) X(35) X(35) VIEQUES PR 34 X 3( 3) 59(62) 23(85) X(85) X(85) X(85) VIEQUES PR 50 X X( X) 25(25) 32(57) 1(58) X(58) X(58) VIEQUES PR 64 X X( X) 9( 9) 23(32) 1(33) X(33) X(33) SAINT THOMAS 34 X 5( 5) 80(85) 9(94) X(94) X(94) X(94) SAINT THOMAS 50 X X( X) 53(53) 25(78) 1(79) X(79) X(79) SAINT THOMAS 64 X X( X) 28(28) 29(57) X(57) X(57) X(57) SAINT CROIX 34 X 5( 5) 67(72) 7(79) X(79) X(79) X(79) SAINT CROIX 50 X X( X) 33(33) 11(44) X(44) X(44) X(44) SAINT CROIX 64 X X( X) 13(13) 7(20) X(20) X(20) X(20) SAINT MAARTEN 34 2 57(59) 40(99) X(99) X(99) X(99) X(99) SAINT MAARTEN 50 X 10(10) 83(93) 1(94) X(94) X(94) X(94) SAINT MAARTEN 64 X 2( 2) 75(77) X(77) X(77) X(77) X(77) ST KITTS-NEVIS 34 2 69(71) 22(93) X(93) X(93) X(93) X(93) ST KITTS-NEVIS 50 X 21(21) 44(65) 1(66) X(66) X(66) X(66) ST KITTS-NEVIS 64 X 6( 6) 27(33) 1(34) X(34) X(34) X(34) BARBUDA 34 3 95(98) 2(99) X(99) X(99) X(99) X(99) BARBUDA 50 X 86(86) 9(95) X(95) X(95) X(95) X(95) BARBUDA 64 X 60(60) 21(81) X(81) X(81) X(81) X(81) ANTIGUA 34 3 91(94) 2(96) X(96) X(96) X(96) X(96) ANTIGUA 50 X 65(65) 9(74) X(74) X(74) X(74) X(74) ANTIGUA 64 X 31(31) 9(40) X(40) X(40) X(40) X(40) GUADELOUPE 34 3 58(61) 2(63) 1(64) X(64) X(64) X(64) GUADELOUPE 50 1 12(13) 1(14) X(14) X(14) X(14) X(14) GUADELOUPE 64 X 3( 3) X( 3) X( 3) X( 3) X( 3) X( 3) AVES 34 1 3( 4) 5( 9) 2(11) X(11) X(11) X(11) DOMINICA 34 2 6( 8) 2(10) X(10) X(10) X(10) X(10) MARTINIQUE 34 2 3( 5) 1( 6) X( 6) X( 6) X( 6) X( 6) SAINT LUCIA 34 1 2( 3) 1( 4) X( 4) X( 4) X( 4) X( 4) SAINT VINCENT 34 1 2( 3) X( 3) X( 3) X( 3) X( 3) X( 3) $$ FORECASTER AVILA
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Summary for Hurricane Irma (AT1/AL112017)
2017-09-05 10:47:09| National Hurricane Center (Atlantic)
...DANGEROUS HURRICANE IRMA HEADING FOR THE LEEWARD ISLANDS WITH 150 MPH WINDS... As of 5:00 AM AST Tue Sep 5 the center of Irma was located near 16.6, -57.0 with movement W at 14 mph. The minimum central pressure was 937 mb with maximum sustained winds of about 150 mph.
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Hurricane Irma Public Advisory Number 24
2017-09-05 10:47:09| National Hurricane Center (Atlantic)
Issued at 500 AM AST Tue Sep 05 2017 000 WTNT31 KNHC 050846 TCPAT1 BULLETIN Hurricane Irma Advisory Number 24 NWS National Hurricane Center Miami FL AL112017 500 AM AST Tue Sep 05 2017 ...DANGEROUS HURRICANE IRMA HEADING FOR THE LEEWARD ISLANDS WITH 150 MPH WINDS... SUMMARY OF 500 AM AST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...16.6N 57.0W ABOUT 320 MI...515 KM E OF THE LEEWARD ISLANDS MAXIMUM SUSTAINED WINDS...150 MPH...240 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 14 MPH...22 KM/H MINIMUM CENTRAL PRESSURE...937 MB...27.67 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: The government of Barbados has issued a Tropical Storm Warning for Dominica. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * Antigua, Barbuda, Anguilla, Montserrat, St. Kitts, and Nevis * Saba, St. Eustatius, and Sint Maarten * Saint Martin and Saint Barthelemy * British Virgin Islands * U.S. Virgin Islands * Puerto Rico, Vieques, and Culebra A Hurricane Watch is in effect for... * Guadeloupe A Tropical Storm Warning is in effect for... * Guadeloupe * Dominica A Hurricane Warning means that hurricane conditions are expected somewhere within the warning area. A warning is typically issued 36 hours before the anticipated first occurrence of tropical-storm- force winds, conditions that make outside preparations difficult or dangerous. In this case, for some of easternmost islands, the hurricane conditions are expected within the next 24 hours. Preparations to protect life and property should be rushed to completion. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area in this case within 36 hours. Interests in the Dominican Republic, Haiti, the Turks and Caicos Islands, Cuba, and the southeastern and central Bahamas should monitor the progress of Irma. 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 the United States, please monitor products issued by your national meteorological service. DISCUSSION AND 48-HOUR OUTLOOK ------------------------------ At 500 AM AST (0900 UTC), the distinct eye of Hurricane Irma was located near latitude 16.6 North, longitude 57.0 West. Irma is moving toward the west near 14 mph (22 km/h), and this general motion is expected to continue today, followed by a turn toward the west-northwest tonight. On the forecast track, the core of Irma will move near or over portions of the northern Leeward Islands tonight and early Wednesday. Maximum sustained winds have increased to near 150 mph (240 km/h) with higher gusts. Irma is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. A NOAA Hurricane Hunter plane is scheduled to be in the eye of Irma within the hour. Some fluctuations in intensity are likely during the next day or two, but Irma is forecast to remain a powerful category 4 hurricane. Hurricane-force winds extend outward up to 45 miles (75 km) from the center and tropical-storm-force winds extend outward up to 140 miles (220 km). The estimated minimum central pressure is 937 mb (27.67 inches). HAZARDS AFFECTING LAND ---------------------- STORM SURGE: The combination of a dangerous storm surge and large breaking waves will raise water levels by as much as 6 to 9 feet above normal tide levels along the coasts of the extreme northern Leeward Islands within the hurricane warning area near and to the north of the center of Irma. Near the coast, the surge will be accompanied by large and destructive waves. The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water is expected to reach the following heights above ground if the peak surge occurs at the time of high tide... British and U.S. Virgin Islands except St. Croix...4 to 6 ft Northern coast of Puerto Rico...2 to 4 ft Southern coast of Puerto Rico and St. Croix...1 to 2 ft The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and destructive waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office. WIND: Hurricane conditions are expected within the hurricane warning area by tonight, with tropical storm conditions beginning later today. Tropical storm conditions are expected within the tropical storm warning area where hurricane conditions are also possible. RAINFALL: Irma is expected to produce total rainfall accumulations of 4 to 8 inches with isolated maximum amounts of 12 inches across the northern Leeward Islands, the British and U.S. Virgin Islands, and Puerto Rico. These rainfall amounts may cause life-threatening flash floods and mudslides. SURF: Swells generated by Irma will affect the northern Leeward Islands, Puerto Rico, and the U.S. and British Virgin Islands during the next several days. 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 800 AM AST. Next complete advisory at 1100 AM AST. $$ Forecaster Avila
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Hurricane Irma Forecast Advisory Number 24
2017-09-05 10:46:45| National Hurricane Center (Atlantic)
Issued at 0900 UTC TUE SEP 05 2017 000 WTNT21 KNHC 050846 TCMAT1 HURRICANE IRMA FORECAST/ADVISORY NUMBER 24 NWS NATIONAL HURRICANE CENTER MIAMI FL AL112017 0900 UTC TUE SEP 05 2017 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE GOVERNMENT OF BARBADOS HAS ISSUED A TROPICAL STORM WARNING FOR DOMINICA. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WARNING IS IN EFFECT FOR... * ANTIGUA... BARBUDA... ANGUILLA... MONTSERRAT... ST. KITTS... AND NEVIS * SABA... ST. EUSTATIUS... AND SINT MAARTEN * SAINT MARTIN AND SAINT BARTHELEMY * BRITISH VIRGIN ISLANDS * U.S. VIRGIN ISLANDS * PUERTO RICO... VIEQUES... AND CULEBRA A HURRICANE WATCH IS IN EFFECT FOR... * GUADELOUPE A TROPICAL STORM WARNING IS IN EFFECT FOR... * GUADELOUPE * DOMINICA A HURRICANE WARNING MEANS THAT HURRICANE CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA. A WARNING IS TYPICALLY ISSUED 36 HOURS BEFORE THE ANTICIPATED FIRST OCCURRENCE OF TROPICAL-STORM- FORCE WINDS... CONDITIONS THAT MAKE OUTSIDE PREPARATIONS DIFFICULT OR DANGEROUS. IN THIS CASE... FOR SOME OF EASTERNMOST ISLANDS... THE HURRICANE CONDITIONS ARE EXPECTED WITHIN THE NEXT 24 HOURS. PREPARATIONS TO PROTECT LIFE AND PROPERTY SHOULD BE RUSHED TO COMPLETION. A TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA IN THIS CASE WITHIN 36 HOURS. INTERESTS IN THE DOMINICAN REPUBLIC... HAITI... THE TURKS AND CAICOS ISLANDS... CUBA... AND THE SOUTHEASTERN AND CENTRAL BAHAMAS SHOULD MONITOR THE PROGRESS OF IRMA. HURRICANE CENTER LOCATED NEAR 16.6N 57.0W AT 05/0900Z POSITION ACCURATE WITHIN 10 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 12 KT ESTIMATED MINIMUM CENTRAL PRESSURE 937 MB MAX SUSTAINED WINDS 130 KT WITH GUSTS TO 160 KT. 64 KT....... 40NE 35SE 30SW 35NW. 50 KT....... 70NE 60SE 50SW 60NW. 34 KT.......120NE 100SE 80SW 120NW. 12 FT SEAS..270NE 120SE 180SW 300NW. 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 16.6N 57.0W AT 05/0900Z AT 05/0600Z CENTER WAS LOCATED NEAR 16.6N 56.4W FORECAST VALID 05/1800Z 17.0N 58.9W MAX WIND 130 KT...GUSTS 160 KT. 64 KT... 40NE 35SE 30SW 35NW. 50 KT... 70NE 60SE 50SW 60NW. 34 KT...130NE 100SE 80SW 110NW. FORECAST VALID 06/0600Z 17.7N 61.5W MAX WIND 130 KT...GUSTS 160 KT. 64 KT... 40NE 35SE 30SW 35NW. 50 KT... 70NE 60SE 60SW 60NW. 34 KT...140NE 110SE 80SW 120NW. FORECAST VALID 06/1800Z 18.6N 64.2W MAX WIND 130 KT...GUSTS 160 KT. 64 KT... 40NE 35SE 30SW 35NW. 50 KT... 80NE 70SE 60SW 70NW. 34 KT...150NE 130SE 90SW 140NW. FORECAST VALID 07/0600Z 19.6N 67.0W MAX WIND 125 KT...GUSTS 150 KT. 50 KT... 80NE 70SE 60SW 70NW. 34 KT...160NE 140SE 90SW 150NW. FORECAST VALID 08/0600Z 21.2N 72.5W MAX WIND 120 KT...GUSTS 145 KT. 50 KT... 90NE 80SE 60SW 80NW. 34 KT...170NE 160SE 100SW 160NW. EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM ON DAY 4 AND 200 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY OUTLOOK VALID 09/0600Z 22.4N 77.2W MAX WIND 115 KT...GUSTS 140 KT. OUTLOOK VALID 10/0600Z 24.0N 81.0W MAX WIND 115 KT...GUSTS 140 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 16.6N 57.0W NEXT ADVISORY AT 05/1500Z $$ FORECASTER AVILA
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