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Tropical Storm Eta Forecast Discussion Number 40
2020-11-10 09:39:18| National Hurricane Center (Atlantic)
Issued at 300 AM CST Tue Nov 10 2020 000 WTNT44 KNHC 100839 TCDAT4 Tropical Storm Eta Discussion Number 40 NWS National Hurricane Center Miami FL AL292020 300 AM CST Tue Nov 10 2020 There hasn't been a lot of change to the cloud pattern of Eta overnight, with the center apparently located on the northwestern side of a small central dense overcast. Scatterometer data from earlier indicated 35-40 kt winds, and with the typical undersampling from that instrument, along with consensus 45-kt estimates from TAFB/SAB, so Eta's initial wind speed is kept at 45 kt. A NOAA Hurricane Hunter aircraft should be in the storm this morning. Eta is forecast to be in a low-to-moderate shear environment over warm SSTs for the next couple of days. Gradual strengthening is expected through early Thursday, with the main restrictive factor being nearby dry air. After that time, increasing shear and drier mid-level air are likely to cause Eta to weaken. The rate of this weakening is pretty uncertain, and a lot depends on how much Eta can re-intensify over the next couple of days. The new forecast is similar to the previous one, which is quite close to the consensus guidance. The storm has basically become stationary overnight. Eta should drift to north today due to steering flow changes with a nearby upper-level low losing influence while ridging east of Florida builds southward. A slow northward track is then anticipated for a couple of days over the east-central Gulf of Mexico in this flow pattern. Beyond that time, model guidance is in rather poor agreement, ranging from a stronger system moving faster to the northeast due to broad troughing over the south-central United States, to a weaker tropical cyclone getting caught under a narrow ridge over the Gulf of Mexico and turning west-southwestward. Since the new forecast expects Eta to be weakening, the NHC forecast will be west of the consensus and west of the previous track. I have little confidence in the long-range track forecast due to its seeming dependence on the intensity, and the wide spread in the guidance. Key Messages: 1. Heavy rainfall from Eta will continue across western Cuba and South Florida today and tonight. Additional flash and urban flooding, especially across previously inundated areas, will be possible in South Florida. Flash and urban flooding will also be possible for western Cuba. 2. Eta could approach the Florida Gulf Coast later this week as a tropical storm, and possibly bring impacts from rain, wind, and storm surge. Interests in this area should continue to monitor the progress of Eta and updates to the forecast this week. FORECAST POSITIONS AND MAX WINDS INIT 10/0900Z 22.9N 85.5W 45 KT 50 MPH 12H 10/1800Z 23.1N 85.6W 50 KT 60 MPH 24H 11/0600Z 24.0N 85.6W 55 KT 65 MPH 36H 11/1800Z 25.0N 85.4W 60 KT 70 MPH 48H 12/0600Z 26.0N 85.3W 60 KT 70 MPH 60H 12/1800Z 26.8N 85.3W 50 KT 60 MPH 72H 13/0600Z 27.3N 85.4W 40 KT 45 MPH 96H 14/0600Z 28.8N 86.5W 35 KT 40 MPH 120H 15/0600Z 30.0N 87.0W 30 KT 35 MPH $$ Forecaster Blake
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Summary for Tropical Storm Eta (AT4/AL292020)
2020-11-10 09:38:18| National Hurricane Center (Atlantic)
...ETA LINGERING JUST NORTH OF THE YUCATAN CHANNEL... ...RISK OF FLOODING OVER SOUTH FLORIDA AND WESTERN CUBA CONTINUES... As of 3:00 AM CST Tue Nov 10 the center of Eta was located near 22.9, -85.5 with movement Stationary. The minimum central pressure was 995 mb with maximum sustained winds of about 50 mph.
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Tropical Storm Eta Public Advisory Number 40
2020-11-10 09:38:18| National Hurricane Center (Atlantic)
Issued at 300 AM CST Tue Nov 10 2020 000 WTNT34 KNHC 100838 TCPAT4 BULLETIN Tropical Storm Eta Advisory Number 40 NWS National Hurricane Center Miami FL AL292020 300 AM CST Tue Nov 10 2020 ...ETA LINGERING JUST NORTH OF THE YUCATAN CHANNEL... ...RISK OF FLOODING OVER SOUTH FLORIDA AND WESTERN CUBA CONTINUES... SUMMARY OF 300 AM CST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...22.9N 85.5W ABOUT 80 MI...125 KM NNW OF THE WESTERN TIP OF CUBA MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H PRESENT MOVEMENT...STATIONARY MINIMUM CENTRAL PRESSURE...995 MB...29.39 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Tropical Storm Watch is in effect for... * The Cuban provinces of La Habana, Artemisa, Mayabeque, Pinar del Rio, and the Isle of Youth A Tropical Storm Watch means that tropical storm conditions are possible within the watch area. Interests along the Gulf Coast of Florida should monitor the progress of Eta. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 300 AM CST (0900 UTC), the center of Tropical Storm Eta was located near latitude 22.9 North, longitude 85.5 West. Eta is stationary, and little overall motion is forecast today, with a slow northward motion is expected tonight through Thursday. Maximum sustained winds are near 50 mph (85 km/h) with higher gusts. Some strengthening is forecast during the next day or two, followed by weakening likely starting on Thursday. Tropical-storm-force winds extend outward up to 60 miles (95 km) from the center. The estimated minimum central pressure is 995 mb (29.39 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Eta 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. RAINFALL: Eta is expected to produce the following rainfall amounts today and tonight: Western Cuba: an additional 3 to 5 inches (75 to 125 mm), with isolated maximum storm total accumulations of 25 inches (765 mm). South Florida: an additional 1 to 2 inches (25 to 50 mm)), with isolated maximum storm total accumulations of 20 inches (510 mm). Flash and river flooding will be possible in western Cuba, along with landslides in areas of higher terrain. Additional flash and urban flooding, especially across previously inundated areas, will be possible in South Florida today and tonight. WIND: Tropical storm conditions are possible in the Tropical Storm Watch area in Cuba today. SURF: Swells generated by Eta are expected to affect the north coast of Cuba, the northwestern Bahamas, southern Florida and the Florida Keys during the next day or so. 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 600 AM CST. Next complete advisory at 900 AM CST. $$ Forecaster Blake
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Tropical Storm Eta Wind Speed Probabilities Number 40
2020-11-10 09:38:18| National Hurricane Center (Atlantic)
Issued at 0900 UTC TUE NOV 10 2020 000 FONT14 KNHC 100838 PWSAT4 TROPICAL STORM ETA WIND SPEED PROBABILITIES NUMBER 40 NWS NATIONAL HURRICANE CENTER MIAMI FL AL292020 0900 UTC TUE NOV 10 2020 AT 0900Z THE CENTER OF TROPICAL STORM ETA WAS LOCATED NEAR LATITUDE 22.9 NORTH...LONGITUDE 85.5 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 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 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) 1( 1) 1( 2) 1( 3) 1( 4) WAYCROSS GA 34 X X( X) X( X) X( X) 1( 1) 1( 2) 1( 3) MAYPORT NS FL 34 X X( X) X( X) 1( 1) 2( 3) 1( 4) 1( 5) JACKSONVILLE 34 X X( X) X( X) X( X) 1( 1) 1( 2) 1( 3) GAINESVILLE FL 34 X X( X) X( X) 1( 1) 3( 4) X( 4) 1( 5) DAYTONA BEACH 34 X X( X) X( X) 1( 1) 1( 2) X( 2) 1( 3) THE VILLAGES 34 X X( X) X( X) 2( 2) 2( 4) X( 4) 1( 5) ORLANDO FL 34 X X( X) X( X) 2( 2) 1( 3) X( 3) 1( 4) COCOA BEACH FL 34 X X( X) 1( 1) 2( 3) 3( 6) X( 6) 1( 7) PATRICK AFB 34 X X( X) 1( 1) 2( 3) 3( 6) X( 6) 1( 7) FT PIERCE FL 34 X X( X) 1( 1) 2( 3) 2( 5) 1( 6) X( 6) W PALM BEACH 34 X X( X) 2( 2) 1( 3) 2( 5) X( 5) X( 5) FT LAUDERDALE 34 X X( X) 2( 2) 2( 4) 1( 5) 1( 6) X( 6) MARATHON FL 34 X 1( 1) 3( 4) 3( 7) 1( 8) 1( 9) X( 9) KEY WEST FL 34 X 2( 2) 3( 5) 3( 8) 2(10) 1(11) X(11) NAPLES FL 34 X 2( 2) 3( 5) 5(10) 4(14) X(14) 1(15) FT MYERS FL 34 X 1( 1) X( 1) 2( 3) 2( 5) 1( 6) X( 6) VENICE FL 34 X 1( 1) 4( 5) 9(14) 5(19) 2(21) X(21) VENICE FL 50 X X( X) X( X) 1( 1) 1( 2) 1( 3) X( 3) TAMPA FL 34 X 1( 1) 3( 4) 6(10) 6(16) 2(18) 1(19) CEDAR KEY FL 34 X X( X) 2( 2) 5( 7) 8(15) 2(17) 1(18) TALLAHASSEE FL 34 X X( X) X( X) 1( 1) 4( 5) 3( 8) 1( 9) ST MARKS FL 34 X X( X) X( X) 2( 2) 3( 5) 3( 8) 2(10) APALACHICOLA 34 X X( X) 2( 2) 4( 6) 11(17) 5(22) 2(24) APALACHICOLA 50 X X( X) X( X) X( X) 3( 3) 1( 4) X( 4) GFMX 290N 850W 34 X X( X) 3( 3) 8(11) 13(24) 3(27) 3(30) GFMX 290N 850W 50 X X( X) X( X) 1( 1) 5( 6) 1( 7) X( 7) GFMX 290N 850W 64 X X( X) X( X) X( X) 1( 1) X( 1) 1( 2) PANAMA CITY FL 34 X X( X) 1( 1) 4( 5) 8(13) 5(18) 3(21) DESTIN EXEC AP 34 X X( X) X( X) 1( 1) 2( 3) 3( 6) 4(10) COLUMBUS GA 34 X X( X) X( X) X( X) 1( 1) 1( 2) 2( 4) BIRMINGHAM AL 34 X X( X) X( X) X( X) X( X) 1( 1) 2( 3) MONTGOMERY AL 34 X X( X) X( X) X( X) 1( 1) 1( 2) 3( 5) WHITING FLD FL 34 X X( X) X( X) X( X) 2( 2) 3( 5) 4( 9) PENSACOLA FL 34 X X( X) X( X) X( X) 2( 2) 3( 5) 4( 9) GFMX 290N 870W 34 X X( X) 2( 2) 3( 5) 9(14) 5(19) 4(23) GFMX 290N 870W 50 X X( X) X( X) X( X) 1( 1) 2( 3) 1( 4) MOBILE AL 34 X X( X) X( X) X( X) 1( 1) 3( 4) 3( 7) GULFPORT MS 34 X X( X) X( X) X( X) 1( 1) 1( 2) 3( 5) STENNIS MS 34 X X( X) X( X) X( X) X( X) 2( 2) 2( 4) BURAS LA 34 X X( X) X( X) X( X) 1( 1) 1( 2) 2( 4) GFMX 280N 890W 34 X X( X) 2( 2) 2( 4) 3( 7) 3(10) 3(13) NEW ORLEANS LA 34 X X( X) X( X) X( X) X( X) 1( 1) 2( 3) GFMX 280N 910W 34 X X( X) X( X) 1( 1) X( 1) 1( 2) 1( 3) COZUMEL MX 34 1 X( 1) 2( 3) X( 3) X( 3) 1( 4) X( 4) CP SAN ANTONIO 34 3 3( 6) 3( 9) 1(10) 1(11) 1(12) X(12) HAVANA 34 X 2( 2) 3( 5) 2( 7) 2( 9) X( 9) X( 9) ISLE OF PINES 34 X 2( 2) 2( 4) 1( 5) 1( 6) X( 6) X( 6) PENSACOLA NAS 34 X X( X) X( X) 2( 2) 4( 6) 5(11) 4(15) PENSACOLA NAS 50 X X( X) X( X) X( X) X( X) 1( 1) 2( 3) KEESLER AB 34 X X( X) X( X) X( X) 3( 3) 3( 6) 4(10) $$ FORECASTER BLAKE
Tropical Storm Eta Forecast Advisory Number 40
2020-11-10 09:37:48| National Hurricane Center (Atlantic)
Issued at 0900 UTC TUE NOV 10 2020 000 WTNT24 KNHC 100837 TCMAT4 TROPICAL STORM ETA FORECAST/ADVISORY NUMBER 40 NWS NATIONAL HURRICANE CENTER MIAMI FL AL292020 0900 UTC TUE NOV 10 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WATCH IS IN EFFECT FOR... * THE CUBAN PROVINCES OF LA HABANA...ARTEMISA...MAYABEQUE...PINAR DEL RIO...AND THE ISLE OF YOUTH A TROPICAL STORM WATCH MEANS THAT TROPICAL STORM CONDITIONS ARE POSSIBLE WITHIN THE WATCH AREA. INTERESTS ALONG THE GULF COAST OF FLORIDA SHOULD MONITOR THE PROGRESS OF ETA. TROPICAL STORM CENTER LOCATED NEAR 22.9N 85.5W AT 10/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE NORTH OR 360 DEGREES AT 0 KT ESTIMATED MINIMUM CENTRAL PRESSURE 995 MB MAX SUSTAINED WINDS 45 KT WITH GUSTS TO 55 KT. 34 KT....... 50NE 30SE 40SW 40NW. 12 FT SEAS..150NE 90SE 120SW 150NW. 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 22.9N 85.5W AT 10/0900Z AT 10/0600Z CENTER WAS LOCATED NEAR 23.0N 85.4W FORECAST VALID 10/1800Z 23.1N 85.6W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 0SE 0SW 20NW. 34 KT... 70NE 50SE 40SW 40NW. FORECAST VALID 11/0600Z 24.0N 85.6W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 30NE 20SE 0SW 20NW. 34 KT... 80NE 70SE 40SW 40NW. FORECAST VALID 11/1800Z 25.0N 85.4W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 30NE 30SE 20SW 30NW. 34 KT... 80NE 80SE 50SW 50NW. FORECAST VALID 12/0600Z 26.0N 85.3W MAX WIND 60 KT...GUSTS 75 KT. 50 KT... 30NE 30SE 20SW 30NW. 34 KT... 80NE 80SE 50SW 50NW. FORECAST VALID 12/1800Z 26.8N 85.3W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 30NE 30SE 20SW 20NW. 34 KT... 60NE 60SE 40SW 40NW. FORECAST VALID 13/0600Z 27.3N 85.4W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 50NE 40SE 30SW 40NW. 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 14/0600Z 28.8N 86.5W MAX WIND 35 KT...GUSTS 45 KT. OUTLOOK VALID 15/0600Z 30.0N 87.0W MAX WIND 30 KT...GUSTS 40 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 22.9N 85.5W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 10/1200Z NEXT ADVISORY AT 10/1500Z $$ FORECASTER BLAKE
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