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Tropical Storm Hanna Forecast Discussion Number 6
2020-07-24 10:34:38| National Hurricane Center (Atlantic)
Issued at 400 AM CDT Fri Jul 24 2020 000 WTNT43 KNHC 240834 TCDAT3 Tropical Storm Hanna Discussion Number 6 NWS National Hurricane Center Miami FL AL082020 400 AM CDT Fri Jul 24 2020 Satellite imagery shows well-defined convective banding features over the eastern and southern portions of the circulation with some cooling of the cloud tops. This suggests that the associated thunderstorm activity is becoming more vigorous. However, surface observations over the Gulf and a scatterometer pass from a few hours ago indicate that the system has not strengthened further at this time. The current intensity estimate is held at 35 kt in agreement with a Dvorak classification from TAFB. A NOAA Hurricane Hunter aircraft is scheduled to investigate the storm later this morning and they should provide a good estimate of Hanna's intensity. The storm has an impressive upper-level anticyclonic outflow structure and should remain in a low shear environment until it reaches the coast. Therefore strengthening is likely prior to landfall and the NHC intensity forecast is near the model high end of the intensity model suite. The storm has moved a little faster toward the west-northwest over the past several hours, and the initial motion estimate is 290/8 kt. There is very little change to the official track forecast or reasoning from the previous cycle. A gradual turn toward the west is likely in 12 hours or so as a mid-level ridge to the north of Hanna builds a bit. The forecast track takes the center inland over Texas within the tropical storm warning area on Saturday. This is in good agreement with the dynamical model consensus and the latest ECMWF model solution. Key Messages 1. Hanna is forecast to strengthen and it is expected to bring tropical-storm-force winds to portions of the Texas coast, where a tropical storm warning is in effect. 2. Hanna is expected to produce heavy rains across portions of southern Texas. These rains could result in flash flooding and isolated minor to moderate river flooding. FORECAST POSITIONS AND MAX WINDS INIT 24/0900Z 26.7N 92.4W 35 KT 40 MPH 12H 24/1800Z 27.1N 93.7W 40 KT 45 MPH 24H 25/0600Z 27.3N 95.5W 50 KT 60 MPH 36H 25/1800Z 27.3N 97.1W 55 KT 65 MPH 48H 26/0600Z 27.2N 98.6W 40 KT 45 MPH...INLAND 60H 26/1800Z 26.5N 100.0W 30 KT 35 MPH...INLAND 72H 27/0600Z 26.0N 101.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 28/0600Z...DISSIPATED $$ Forecaster Pasch
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Tropical Storm Hanna Wind Speed Probabilities Number 6
2020-07-24 10:34:08| National Hurricane Center (Atlantic)
Issued at 0900 UTC FRI JUL 24 2020 000 FONT13 KNHC 240833 PWSAT3 TROPICAL STORM HANNA WIND SPEED PROBABILITIES NUMBER 6 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082020 0900 UTC FRI JUL 24 2020 AT 0900Z THE CENTER OF TROPICAL STORM HANNA WAS LOCATED NEAR LATITUDE 26.7 NORTH...LONGITUDE 92.4 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 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 FRI 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 FRI 18Z FRI 06Z SAT 18Z SAT 06Z SUN 06Z MON 06Z TUE PERIODS TO TO TO TO TO TO TO 18Z FRI 06Z SAT 18Z SAT 06Z SUN 06Z MON 06Z TUE 06Z WED FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT GFMX 280N 930W 34 8 3(11) 1(12) X(12) X(12) X(12) X(12) CAMERON LA 34 X 2( 2) 1( 3) X( 3) X( 3) X( 3) X( 3) GALVESTON TX 34 1 5( 6) 1( 7) 1( 8) X( 8) X( 8) X( 8) HOUSTON TX 34 X 1( 1) X( 1) 1( 2) 1( 3) X( 3) X( 3) SAN ANTONIO TX 34 X X( X) 1( 1) 4( 5) 1( 6) X( 6) X( 6) FREEPORT TX 34 X 2( 2) 2( 4) 2( 6) 1( 7) X( 7) X( 7) GFMX 280N 950W 34 1 38(39) 4(43) 1(44) X(44) X(44) X(44) GFMX 280N 950W 50 X 3( 3) X( 3) X( 3) X( 3) X( 3) X( 3) GFMX 280N 950W 64 X 1( 1) 1( 2) X( 2) X( 2) X( 2) X( 2) MATAGORDA TX 34 X 12(12) 8(20) 1(21) 1(22) X(22) X(22) PORT O CONNOR 34 X 14(14) 15(29) 2(31) 1(32) X(32) X(32) PORT O CONNOR 50 X X( X) 1( 1) X( 1) X( 1) X( 1) X( 1) PORT O CONNOR 64 X 1( 1) 1( 2) X( 2) X( 2) X( 2) X( 2) ROCKPORT TX 34 X 2( 2) 23(25) 10(35) 1(36) X(36) X(36) ROCKPORT TX 50 X X( X) 1( 1) X( 1) X( 1) X( 1) X( 1) ROCKPORT TX 64 X X( X) 1( 1) X( 1) X( 1) X( 1) X( 1) CORPUS CHRISTI 34 X 1( 1) 25(26) 14(40) 1(41) X(41) X(41) CORPUS CHRISTI 50 X X( X) 1( 1) 1( 2) X( 2) X( 2) X( 2) CORPUS CHRISTI 64 X X( X) 1( 1) 1( 2) X( 2) X( 2) X( 2) GFMX 270N 960W 34 X 35(35) 23(58) 3(61) X(61) X(61) X(61) GFMX 270N 960W 50 X 2( 2) 4( 6) 1( 7) X( 7) X( 7) X( 7) GFMX 270N 960W 64 X 1( 1) 2( 3) 1( 4) X( 4) X( 4) X( 4) MCALLEN TX 34 X X( X) 3( 3) 12(15) 3(18) X(18) X(18) HARLINGEN TX 34 X X( X) 6( 6) 12(18) 2(20) X(20) X(20) BROWNSVILLE TX 34 X X( X) 4( 4) 7(11) 1(12) X(12) X(12) GFMX 250N 960W 34 X 1( 1) 2( 3) 2( 5) X( 5) X( 5) X( 5) $$ FORECASTER PASCH
Summary for Tropical Storm Hanna (AT3/AL082020)
2020-07-24 10:33:33| National Hurricane Center (Atlantic)
...HANNA EXPECTED TO STRENGTHEN TODAY AND TONIGHT... As of 4:00 AM CDT Fri Jul 24 the center of Hanna was located near 26.7, -92.4 with movement WNW at 9 mph. The minimum central pressure was 1002 mb with maximum sustained winds of about 40 mph.
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Tropical Storm Hanna Forecast Advisory Number 6
2020-07-24 10:33:33| National Hurricane Center (Atlantic)
Issued at 0900 UTC FRI JUL 24 2020 000 WTNT23 KNHC 240833 TCMAT3 TROPICAL STORM HANNA FORECAST/ADVISORY NUMBER 6 NWS NATIONAL HURRICANE CENTER MIAMI FL AL082020 0900 UTC FRI JUL 24 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... A TROPICAL STORM WARNING IS IN EFFECT FOR... * MOUTH OF THE RIO GRANDE TO SAN LUIS PASS TEXAS A TROPICAL STORM WATCH IS IN EFFECT FOR... * SAN LUIS PASS TO HIGH ISLAND TEXAS 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...GENERALLY WITHIN 48 HOURS. INTERESTS ALONG THE TEXAS AND LOUISIANA COAST SHOULD MONITOR THE PROGRESS OF THIS SYSTEM. TROPICAL STORM CENTER LOCATED NEAR 26.7N 92.4W AT 24/0900Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST-NORTHWEST OR 290 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1002 MB MAX SUSTAINED WINDS 35 KT WITH GUSTS TO 45 KT. 34 KT....... 40NE 40SE 0SW 0NW. 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 26.7N 92.4W AT 24/0900Z AT 24/0600Z CENTER WAS LOCATED NEAR 26.5N 92.0W FORECAST VALID 24/1800Z 27.1N 93.7W MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 70NE 70SE 0SW 0NW. FORECAST VALID 25/0600Z 27.3N 95.5W MAX WIND 50 KT...GUSTS 60 KT. 50 KT... 20NE 0SE 0SW 20NW. 34 KT... 70NE 60SE 30SW 50NW. FORECAST VALID 25/1800Z 27.3N 97.1W MAX WIND 55 KT...GUSTS 65 KT. 50 KT... 20NE 0SE 0SW 20NW. 34 KT... 70NE 60SE 30SW 60NW. FORECAST VALID 26/0600Z 27.2N 98.6W...INLAND MAX WIND 40 KT...GUSTS 50 KT. 34 KT... 70NE 60SE 30SW 30NW. FORECAST VALID 26/1800Z 26.5N 100.0W...INLAND MAX WIND 30 KT...GUSTS 40 KT. FORECAST VALID 27/0600Z 26.0N 101.0W...POST-TROP/REMNT LOW MAX WIND 20 KT...GUSTS 30 KT. 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 28/0600Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 26.7N 92.4W INTERMEDIATE PUBLIC ADVISORY...WTNT33 KNHC/MIATCPAT3...AT 24/1200Z NEXT ADVISORY AT 24/1500Z $$ FORECASTER PASCH
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Tropical Storm Hanna Public Advisory Number 6
2020-07-24 10:33:33| National Hurricane Center (Atlantic)
Issued at 400 AM CDT Fri Jul 24 2020 000 WTNT33 KNHC 240833 TCPAT3 BULLETIN Tropical Storm Hanna Advisory Number 6 NWS National Hurricane Center Miami FL AL082020 400 AM CDT Fri Jul 24 2020 ...HANNA EXPECTED TO STRENGTHEN TODAY AND TONIGHT... SUMMARY OF 400 AM CDT...0900 UTC...INFORMATION ---------------------------------------------- LOCATION...26.7N 92.4W ABOUT 315 MI...510 KM ESE OF CORPUS CHRISTI TEXAS MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 9 MPH...15 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 Warning is in effect for... * Mouth of the Rio Grande to San Luis Pass Texas A Tropical Storm Watch is in effect for... * San Luis Pass to High Island Texas 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, generally within 48 hours. Interests along the Texas and Louisiana coast should monitor the progress of this system. For storm information specific to your area, including possible inland watches and warnings, please monitor products issued by your local National Weather Service forecast office. DISCUSSION AND OUTLOOK ---------------------- At 400 AM CDT (0900 UTC), the center of Tropical Storm Hanna was located near latitude 26.7 North, longitude 92.4 West. Hanna is moving toward the west-northwest near 9 mph (15 km/h) and a turn toward the west is expected tonight, followed by a generally westward motion through the weekend. On the forecast track, the storm center should make landfall along the Texas coast within the warning area on Saturday. Maximum sustained winds are near 40 mph (65 km/h) with higher gusts. Strengthening is expected until the system makes landfall. Steady weakening is expected after Hanna moves inland. Tropical-storm-force winds extend outward up to 45 miles (75 km) from the center. The estimated minimum central pressure is 1002 mb (29.59 inches). HAZARDS AFFECTING LAND ---------------------- Key messages for Tropical Storm Hanna can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC. WIND: Tropical storm conditions are expected in the warning area by tonight or Saturday morning. Tropical storm conditions are possible within the watch area by tonight or Saturday morning. RAINFALL: Hanna is expected to produce 4 to 8 inches of rain with isolated maximum totals of 12 inches through Sunday night in south Texas. This rain may result in life-threatening flash flooding, rapid rises on small streams, and isolated minor to moderate river flooding in south Texas. 3 to 5 inches of rain is expected along the upper Texas and Louisiana coasts, and inland to the Mexican states of Coahuila, Nuevo Leon, and northern Tamaulipas. SURF: Swells generated by Hanna are expected to increase and affect much of the Texas and Louisiana coasts 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 CDT. Next complete advisory at 1000 AM CDT. $$ Forecaster Pasch
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