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Tropical Storm Nana Wind Speed Probabilities Number 3
2020-09-01 22:49:15| National Hurricane Center (Atlantic)
Issued at 2100 UTC TUE SEP 01 2020 000 FONT11 KNHC 012049 PWSAT1 TROPICAL STORM NANA WIND SPEED PROBABILITIES NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162020 2100 UTC TUE SEP 01 2020 AT 2100Z THE CENTER OF TROPICAL STORM NANA WAS LOCATED NEAR LATITUDE 16.8 NORTH...LONGITUDE 79.3 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 45 KTS...50 MPH...85 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 18Z 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 18Z TUE 06Z WED 18Z WED 06Z THU 18Z THU 18Z FRI 18Z SAT PERIODS TO TO TO TO TO TO TO 06Z WED 18Z WED 06Z THU 18Z THU 18Z FRI 18Z SAT 18Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT FRONTERA MX 34 X X( X) X( X) 5( 5) 2( 7) X( 7) X( 7) MERIDA MX 34 X X( X) 2( 2) 3( 5) X( 5) X( 5) X( 5) COZUMEL MX 34 X 5( 5) 7(12) 1(13) X(13) X(13) X(13) BELIZE CITY 34 X 3( 3) 50(53) 16(69) X(69) X(69) X(69) BELIZE CITY 50 X X( X) 14(14) 14(28) 1(29) X(29) X(29) BELIZE CITY 64 X X( X) 3( 3) 6( 9) X( 9) X( 9) X( 9) PUERTO BARRIOS 34 X X( X) 4( 4) 10(14) 1(15) X(15) X(15) GUANAJA 34 X 13(13) 30(43) 1(44) X(44) X(44) X(44) GUANAJA 50 X 1( 1) 12(13) X(13) X(13) X(13) X(13) GUANAJA 64 X X( X) 2( 2) 1( 3) X( 3) X( 3) X( 3) CP SAN ANTONIO 34 X 3( 3) 3( 6) X( 6) X( 6) X( 6) X( 6) ISLE OF PINES 34 1 3( 4) X( 4) X( 4) X( 4) X( 4) X( 4) GRAND CAYMAN 34 10 4(14) X(14) X(14) X(14) X(14) X(14) $$ FORECASTER STEWART
Tropical Storm Nana Forecast Advisory Number 3
2020-09-01 22:48:45| National Hurricane Center (Atlantic)
Issued at 2100 UTC TUE SEP 01 2020 000 WTNT21 KNHC 012048 TCMAT1 TROPICAL STORM NANA FORECAST/ADVISORY NUMBER 3 NWS NATIONAL HURRICANE CENTER MIAMI FL AL162020 2100 UTC TUE SEP 01 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... THE GOVERNMENT OF MEXICO HAS ISSUED A TROPICAL STORM WARNING FOR THE SOUTHERN PORTION OF THE YUCATAN PENINSULA FROM PUERTO COSTA MAYA SOUTHWARD TO CHETUMAL. THE GOVERNMENT OF GUATEMALA HAS ISSUED A TROPICAL STORM WATCH FOR THE CARIBBEAN SEA COAST OF GUATEMALA. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * YUCATAN MEXICO FROM PUERTO COSTA MAYA TO CHETUMAL A TROPICAL STORM WATCH IS IN EFFECT FOR... * NORTHERN HONDURAS * ROATAN ISLAND AND THE BAY ISLANDS OF HONDURAS * CARIBBEAN SEA COAST OF GUATEMALA * BELIZE 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...IN THIS CASE WITHIN 36 TO 48 HOURS. TROPICAL STORM CENTER LOCATED NEAR 16.8N 79.3W AT 01/2100Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST OR 275 DEGREES AT 16 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB MAX SUSTAINED WINDS 45 KT WITH GUSTS TO 55 KT. 34 KT....... 70NE 0SE 0SW 70NW. 12 FT SEAS.. 70NE 0SE 0SW 70NW. 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 16.8N 79.3W AT 01/2100Z AT 01/1800Z CENTER WAS LOCATED NEAR 16.7N 78.4W FORECAST VALID 02/0600Z 17.1N 81.5W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 0NW. 34 KT... 70NE 0SE 0SW 70NW. FORECAST VALID 02/1800Z 17.3N 84.7W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 30NE 20SE 0SW 20NW. 34 KT... 70NE 40SE 0SW 70NW. FORECAST VALID 03/0600Z 17.2N 87.3W MAX WIND 65 KT...GUSTS 80 KT. 64 KT... 15NE 0SE 0SW 15NW. 50 KT... 30NE 20SE 0SW 30NW. 34 KT... 80NE 40SE 0SW 80NW. FORECAST VALID 03/1800Z 16.9N 89.4W...INLAND MAX WIND 45 KT...GUSTS 55 KT. 34 KT... 70NE 40SE 0SW 50NW. FORECAST VALID 04/0600Z 16.5N 91.7W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. FORECAST VALID 04/1800Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 16.8N 79.3W INTERMEDIATE PUBLIC ADVISORY...WTNT31 KNHC/MIATCPAT1...AT 02/0000Z NEXT ADVISORY AT 02/0300Z $$ FORECASTER STEWART
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Tropical Storm Nana Graphics
2020-09-01 19:53:06| National Hurricane Center (Atlantic)
5-Day Uncertainty Track last updated Tue, 01 Sep 2020 17:53:06 GMT Wind Speed Probabilities last updated Tue, 01 Sep 2020 16:52:09 GMT
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Tropical Storm Nana Public Advisory Number 2A
2020-09-01 19:52:13| National Hurricane Center (Atlantic)
Issued at 200 PM EDT Tue Sep 01 2020 000 WTNT31 KNHC 011752 TCPAT1 BULLETIN Tropical Storm Nana Intermediate Advisory Number 2A NWS National Hurricane Center Miami FL AL162020 200 PM EDT Tue Sep 01 2020 ...RECONNAISSANCE AIRCRAFT FINDS TROPICAL STORM NANA GETTING A LITTLE BETTER ORGANIZED SOUTHWEST OF JAMAICA... SUMMARY OF 200 PM EDT...1800 UTC...INFORMATION ---------------------------------------------- LOCATION...16.7N 78.4W ABOUT 110 MI...175 KM S OF NEGRIL JAMAICA ABOUT 650 MI...1045 KM E OF BELIZE CITY MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...W OR 275 DEGREES AT 18 MPH...30 KM/H MINIMUM CENTRAL PRESSURE...1002 MB...29.59 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Watch is in effect for... * Northern Honduras * Roatan Island and the Bay Islands of Honduras * Belize A Tropical Storm Watch may be required for portions of Guatemala and the southern Yucatan Peninsula, along with a Hurricane Watch for Belize, later today. 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, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 200 PM EDT (1800 UTC), the center of Tropical Storm Nana was located near latitude 16.7 North, longitude 78.4 West. Nana is moving toward the west near 18 mph (30 km/h), and this general motion is expected to continue through Thursday. On the forecast track, Nana will be moving near but north of the coast of Honduras on Wednesday and likely be approaching the coast of Belize on Thursday. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Additional strengthening is forecast during the next 48 hours, and Nana could become a hurricane just prior to landfall on Thursday. Tropical-storm-force winds extend outward up to 80 miles (130 km) from the center, mainly northeast through northwest of the center. The estimated minimum central pressure based on data from the reconnaissance aircraft is 1002 mb (29.59 inches). HAZARDS AFFECTING LAND ---------------------- WIND: Tropical storm conditions are possible within the watch areas by late Wednesday. STORM SURGE: A dangerous storm surge will raise water levels by as much as 3 to 5 feet above normal tide levels along the immediate coast near and to the north of where the center makes landfall. Near the coast, the surge will be accompanied by large and destructive waves. RAINFALL: Nana is expected to produce rainfall accumulations of 2 to 4 inches across northern Honduras, Belize, and the southeast portion of the Mexican state of Quintana Roo. SURF: Swells generated by this system are affecting portions of the southern coast of Jamaica, and will continue into Wednesday morning. 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 500 PM EDT. $$ Forecaster Stewart
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Tropical Storm Nana Forecast Discussion Number 2
2020-09-01 18:56:37| National Hurricane Center (Atlantic)
Issued at 100 PM EDT Tue Sep 01 2020 000 WTNT41 KNHC 011656 TCDAT1 Tropical Storm Nana Special Discussion Number 2 NWS National Hurricane Center Miami FL AL162020 100 PM EDT Tue Sep 01 2020 An Air Force Reserve reconnaissance aircraft investigating the vigorous disturbance south of Jamaica this morning has found that the system has a well-defined, closed circulation center. The aircraft also measured 60 kt at 925 mb in the northeastern quadrant and reliable SFMR surface winds of 45 kt. Based on these data, the system has been upgraded to Tropical Storm Nana, the 14th named tropical storm of the 2020 Atlantic hurricane season. The initial motion estimate is an uncertain 280/14 kt, No significant changes were made to the previous track forecast. A strong deep-layer to the north of the system is expected to build slowly westward over the next few days, keeping the disturbance moving in a general west-northwestward to westward direction through 48 hours, followed by a turn toward the west-southwest shortly thereafter when the system will be inland over Central America. The NHC official forecast track lies close to a blend of the simple consensus models TVCN and GFEX, and the corrected-consensus model HCCA. Nana has developed a well-defined upper-level anticyclone, with outflow gradually improving in all quadrants. Modest northeasterly to easterly vertical wind shear is expected to gradually subside to less than 10 kt by 48 hours, which should allow for at least some slow but steady strengthening, given that sea-surface temperatures (SST) will be 29.5-30.5 deg C along the track. Some dry air intrusions might hinder development for the next 24 hours or so, but the global and regional models still indicate that the atmosphere will moisten thereafter, and continue to moisten right up until landfall. Based on the higher initial intensity and the mostly favorable environmental conditions expected after 24 hours, the peak forecast intensity has been increased to 65 kt at 48 hours, just prior to landfall. Due to the Nana's expected proximity to Belize in 48 hours, a Tropical Storm Watch has been issued for that country. Additional watches and possible warnings will likely be required later today for Guatemala and the southern portion of the Yucatan Peninsula. KEY MESSAGES: 1. Tropical Storm Nana is now forecast to be a hurricane as it approaches the coast, and interests in Honduras, Guatemala, Belize and Yucatan should closely monitor the progress of this storm. Strong winds, dangerous storm surge and very heavy rainfall causing flash flooding are becoming more likely from Nana. FORECAST POSITIONS AND MAX WINDS INIT 01/1700Z 16.6N 77.9W 45 KT 50 MPH 12H 02/0000Z 16.6N 79.5W 50 KT 60 MPH 24H 02/1200Z 16.7N 82.3W 55 KT 65 MPH 36H 03/0000Z 16.8N 85.1W 60 KT 70 MPH 48H 03/1200Z 16.8N 87.4W 65 KT 75 MPH 60H 04/0000Z 16.5N 89.6W 30 KT 35 MPH...INLAND 72H 04/1200Z 15.7N 91.7W 15 KT 15 MPH...POST-TROP/REMNT LOW 96H 05/1200Z...DISSIPATED $$ Forecaster Stewart
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