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Tropical Storm Eta Forecast Discussion Number 15
2020-11-04 09:56:35| National Hurricane Center (Atlantic)
Issued at 400 AM EST Wed Nov 04 2020 000 WTNT44 KNHC 040856 TCDAT4 Tropical Storm Eta Discussion Number 15 NWS National Hurricane Center Miami FL AL292020 400 AM EST Wed Nov 04 2020 Eta still has a well-organized cloud pattern while it moves over northern Nicaragua, but there has been a considerable decrease in deep convection as evidenced by the warming cloud tops. Assuming an inland weakening rate as given by the Decay-SHIPS model, the current intensity is reduced to 60 kt. Continued weakening will occur over the next 48 hours or so, and the system should degenerate into remnant low tomorrow. In fact, the surface circulation could lose its identity in a day or two. However, the upper-level circulation is likely to remain intact, and a surface cyclone is predicted to regenerate once the system moves into the northwestern Caribbean Sea on Friday. Some strengthening is forecast thereafter, in line with the intensity model consensus. However, the global models show the system interacting with a strong upper-level trough in 3-5 days, so the cyclone may have some hybrid or subtropical characteristics by that time. Eta continues westward, or at about 270/7 kt. A mid-level ridge to the north of the cyclone should steer it on a generally west-northwestward track during the next 48 hours. Thereafter, a 500-mb trough/low dropping into the Gulf of Mexico is expected to cause the cyclone to move northeastward in 3-4 days. By the end of the forecast period, the system is expected to rotate cyclonically around the eastern side of the low. The official track forecast is quite close to the latest corrected consensus, HCCA, prediction which is usually a good performer. There is still significant uncertainty as to the details of the track in the 3- to 5-day time frame. Of more immediate concern are the torrential rains that Eta will continue to produce over portions of Central America. Key Messages: 1. Through Friday evening, heavy rainfall from Eta will lead to catastrophic, life-threatening flash flooding and river flooding across portions of Central America, along with landslides in areas of higher terrain. Flash and river flooding is also possible across Jamaica, southeast Mexico, El Salvador, southern Haiti, and the Cayman Islands. 2. Eta is forecast to regain tropical storm strength before it moves across portions of Cuba and approaches southern Florida this weekend. While it is too soon to determine the exact timing, magnitude, and location of possible impacts from wind and rainfall, interests in Cuba, southern Florida and the Florida Keys should monitor the progress of Eta through the week. FORECAST POSITIONS AND MAX WINDS INIT 04/0900Z 13.8N 84.7W 60 KT 70 MPH 12H 04/1800Z 14.0N 85.5W 40 KT 45 MPH...INLAND 24H 05/0600Z 14.6N 87.0W 30 KT 35 MPH...INLAND 36H 05/1800Z 15.5N 88.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 06/0600Z 16.5N 88.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 06/1800Z 17.6N 87.6W 30 KT 35 MPH...OVER WATER 72H 07/0600Z 19.0N 85.5W 35 KT 40 MPH 96H 08/0600Z 22.6N 81.8W 45 KT 50 MPH 120H 09/0600Z 25.0N 81.5W 50 KT 60 MPH $$ Forecaster Pasch
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Tropical Storm Eta Wind Speed Probabilities Number 15
2020-11-04 09:56:04| National Hurricane Center (Atlantic)
Issued at 0900 UTC WED NOV 04 2020 000 FONT14 KNHC 040855 PWSAT4 TROPICAL STORM ETA WIND SPEED PROBABILITIES NUMBER 15 NWS NATIONAL HURRICANE CENTER MIAMI FL AL292020 0900 UTC WED NOV 04 2020 AT 0900Z THE CENTER OF TROPICAL STORM ETA WAS LOCATED NEAR LATITUDE 13.8 NORTH...LONGITUDE 84.7 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 60 KTS...70 MPH...110 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 WED 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 WED 18Z WED 06Z THU 18Z THU 06Z FRI 06Z SAT 06Z SUN PERIODS TO TO TO TO TO TO TO 18Z WED 06Z THU 18Z THU 06Z FRI 06Z SAT 06Z SUN 06Z MON FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT ORLANDO FL 34 X X( X) X( X) X( X) X( X) X( X) 3( 3) COCOA BEACH FL 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) PATRICK AFB 34 X X( X) X( X) X( X) X( X) X( X) 5( 5) FT PIERCE FL 34 X X( X) X( X) X( X) X( X) X( X) 6( 6) W PALM BEACH 34 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) 1( 1) 8( 9) MIAMI FL 34 X X( X) X( X) X( X) X( X) X( X) 6( 6) HOMESTEAD ARB 34 X X( X) X( X) X( X) X( X) X( X) 6( 6) MARATHON FL 34 X X( X) X( X) X( X) X( X) 2( 2) 10(12) MARATHON FL 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) KEY WEST FL 34 X X( X) X( X) X( X) X( X) 3( 3) 8(11) KEY WEST FL 50 X X( X) X( X) X( X) X( X) X( X) 3( 3) NAPLES FL 34 X X( X) X( X) X( X) X( X) 1( 1) 7( 8) FT MYERS FL 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) VENICE FL 34 X X( X) X( X) X( X) X( X) X( X) 6( 6) TAMPA FL 34 X X( X) X( X) X( X) X( X) X( X) 4( 4) COZUMEL MX 34 X X( X) X( X) X( X) 2( 2) 1( 3) X( 3) BELIZE CITY 34 X 1( 1) 1( 2) 2( 4) 5( 9) X( 9) X( 9) PUERTO BARRIOS 34 1 X( 1) 6( 7) 2( 9) 1(10) X(10) X(10) GUANAJA 34 1 1( 2) X( 2) X( 2) 4( 6) X( 6) X( 6) PUERTO CABEZAS 34 99 X(99) X(99) X(99) X(99) X(99) X(99) GRAND BAHAMA 34 X X( X) X( X) X( X) X( X) 1( 1) 6( 7) NEW PROVIDENCE 34 X X( X) X( X) X( X) X( X) 1( 1) 5( 6) ANDROS 34 X X( X) X( X) X( X) X( X) 1( 1) 5( 6) CP SAN ANTONIO 34 X X( X) X( X) X( X) 1( 1) 3( 4) 1( 5) HAVANA 34 X X( X) X( X) X( X) X( X) 5( 5) 5(10) ISLE OF PINES 34 X X( X) X( X) X( X) 1( 1) 6( 7) 3(10) CIENFUEGOS 34 X X( X) X( X) X( X) X( X) 3( 3) 4( 7) GRAND CAYMAN 34 X X( X) X( X) X( X) 1( 1) 3( 4) 2( 6) $$ FORECASTER PASCH
Summary for Tropical Storm Eta (AT4/AL292020)
2020-11-04 09:55:34| National Hurricane Center (Atlantic)
...ETA WEAKENS TO A TROPICAL STORM... ...LIFE-THREATENING FLASH FLOODING OCCURRING OVER PORTIONS OF CENTRAL AMERICA... As of 4:00 AM EST Wed Nov 4 the center of Eta was located near 13.8, -84.7 with movement W at 8 mph. The minimum central pressure was 990 mb with maximum sustained winds of about 70 mph.
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Tropical Storm Eta Public Advisory Number 15
2020-11-04 09:55:34| National Hurricane Center (Atlantic)
Issued at 400 AM EST Wed Nov 04 2020 000 WTNT34 KNHC 040855 TCPAT4 BULLETIN Tropical Storm Eta Advisory Number 15 NWS National Hurricane Center Miami FL AL292020 400 AM EST Wed Nov 04 2020 ...ETA WEAKENS TO A TROPICAL STORM... ...LIFE-THREATENING FLASH FLOODING OCCURRING OVER PORTIONS OF CENTRAL AMERICA... SUMMARY OF 400 AM EST...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...13.8N 84.7W ABOUT 90 MI...140 KM W OF PUERTO CABEZAS NICARAGUA MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 8 MPH...13 KM/H MINIMUM CENTRAL PRESSURE...990 MB...29.24 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: A Hurricane Warning is in effect for... * The coast of Nicaragua from the Honduras/Nicaragua border to Sandy Bay Sirpi A Tropical Storm Warning is in effect for... * The northeastern coast of Honduras from Punta Patuca to the Honduras/Nicaragua border * The coast of Nicaragua from south of Sandy Bay Sirpi to Laguna de Perlas. It is recommended that the Hurricane Warning for the coast of Nicaragua be downgraded or discontinued. Interests elsewhere in Nicaragua and Honduras should monitor the progress of this system. For storm information specific to your area, please monitor products issued by your national meteorological service. DISCUSSION AND OUTLOOK ---------------------- At 400 AM EST (0900 UTC), the center of Tropical Storm Eta was located near latitude 13.8 North, longitude 84.7 West. Eta is moving toward the west near 8 mph (13 km/h). A faster west-northwestward motion is expected through Thursday morning. A turn toward the north, and then northeast is forecast Thursday night and Friday. On the forecast track, the center of Eta is expected to move over northern Nicaragua through this morning, and then move across the central portions of Honduras through Thursday morning. The system is forecast to emerge over the northwestern Caribbean Sea on Friday. Maximum sustained winds have decreased to near 70 mph (110 km/h) with higher gusts. Continued weakening will occur while Eta moves over land during the next couple of days, and Eta should become a tropical depression tonight. Tropical-storm-force winds extend outward up to 115 miles (185 km) from the center. The estimated minimum central pressure is 990 mb (29.24 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Eta can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC. WIND: Tropical storm conditions are expected in the warning areas through this morning. RAINFALL: Eta is expected to produce the following rainfall amounts through Sunday morning: Much of Nicaragua and Honduras: 15 to 25 inches (380 to 635 mm), isolated maximum totals of 40 inches (1000 mm) in northeast Nicaragua and eastern Honduras. Eastern Guatemala and Belize: 10 to 20 inches (255 to 510 mm), isolated amounts of 25 inches (635 mm). Portions of Panama and Costa Rica: 10 to 15 inches (255 to 380 mm), isolated amounts of 25 inches (635 mm). El Salvador and southeast Mexico: 5 to 10 inches (125 to 255 mm), isolated amounts of 15 inches (380 mm). Jamaica, Southern Haiti, the Cayman Islands: An additional 3 to 5 inches (75 to 125 mm), isolated storm totals of 15 inches (380 mm). This rainfall will lead to catastrophic, life-threatening flash flooding and river flooding, along with landslides in areas of higher terrain of Central America. Flash flooding and river flooding will be possible across Jamaica, southeast Mexico, El Salvador, southern Haiti, and the Cayman Islands. STORM SURGE: Water levels along the coasts of Nicaragua and Honduras should gradually decrease today. SURF: Swells generated by Eta are expected to affect portions of the coast of Central America and the Yucatan Peninsula of Mexico during the next few 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 700 AM EST. Next complete advisory at 1000 AM EST. $$ Forecaster Pasch
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Tropical Storm Eta Forecast Advisory Number 15
2020-11-04 09:54:33| National Hurricane Center (Atlantic)
Issued at 0900 UTC WED NOV 04 2020 000 WTNT24 KNHC 040854 TCMAT4 TROPICAL STORM ETA FORECAST/ADVISORY NUMBER 15 NWS NATIONAL HURRICANE CENTER MIAMI FL AL292020 0900 UTC WED NOV 04 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A HURRICANE WARNING IS IN EFFECT FOR... * THE COAST OF NICARAGUA FROM THE HONDURAS/NICARAGUA BORDER TO SANDY BAY SIRPI A TROPICAL STORM WARNING IS IN EFFECT FOR... * THE NORTHEASTERN COAST OF HONDURAS FROM PUNTA PATUCA TO THE HONDURAS/NICARAGUA BORDER * THE COAST OF NICARAGUA FROM SOUTH OF SANDY BAY SIRPI TO LAGUNA DE PERLAS. IT IS RECOMMENDED THAT THE HURRICANE WARNING FOR THE COAST OF NICARAGUA BE DOWNGRADED OR DISCONTINUED. INTERESTS ELSEWHERE IN NICARAGUA AND HONDURAS SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL STORM CENTER LOCATED NEAR 13.8N 84.7W AT 04/0900Z POSITION ACCURATE WITHIN 25 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 7 KT ESTIMATED MINIMUM CENTRAL PRESSURE 990 MB MAX SUSTAINED WINDS 60 KT WITH GUSTS TO 75 KT. 50 KT....... 30NE 30SE 30SW 30NW. 34 KT.......100NE 70SE 50SW 90NW. 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 13.8N 84.7W AT 04/0900Z AT 04/0600Z CENTER WAS LOCATED NEAR 13.8N 84.3W FORECAST VALID 04/1800Z 14.0N 85.5W...INLAND MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 60NE 60SE 40SW 60NW. FORECAST VALID 05/0600Z 14.6N 87.0W...INLAND MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 05/1800Z 15.5N 88.5W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 06/0600Z 16.5N 88.7W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 06/1800Z 17.6N 87.6W...OVER WATER MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 07/0600Z 19.0N 85.5W MAX WIND 35 KT...GUSTS 45 KT. 34 KT... 50NE 50SE 40SW 0NW. 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 08/0600Z 22.6N 81.8W MAX WIND 45 KT...GUSTS 55 KT. OUTLOOK VALID 09/0600Z 25.0N 81.5W MAX WIND 50 KT...GUSTS 60 KT. REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 13.8N 84.7W INTERMEDIATE PUBLIC ADVISORY...WTNT34 KNHC/MIATCPAT4...AT 04/1200Z NEXT ADVISORY AT 04/1500Z $$ FORECASTER PASCH
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