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Tropical Depression Marco Public Advisory Number 20
2020-08-25 04:31:24| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Mon Aug 24 2020 000 WTNT34 KNHC 250231 TCPAT4 BULLETIN Tropical Depression Marco Advisory Number 20 NWS National Hurricane Center Miami FL AL142020 1000 PM CDT Mon Aug 24 2020 ...MARCO WEAKENS TO A TROPICAL DEPRESSION... ...HEAVY RAIN STILL POSSIBLE TONIGHT ACROSS PORTIONS OF THE CENTRAL GULF COAST... SUMMARY OF 1000 PM CDT...0300 UTC...INFORMATION ----------------------------------------------- LOCATION...29.0N 89.8W ABOUT 45 MI...70 KM W OF THE MOUTH OF THE MISSISSIPPI RIVER MAXIMUM SUSTAINED WINDS...35 MPH...55 KM/H PRESENT MOVEMENT...W OR 270 DEGREES AT 9 MPH...15 KM/H MINIMUM CENTRAL PRESSURE...1007 MB...29.74 INCHES WATCHES AND WARNINGS -------------------- CHANGES WITH THIS ADVISORY: None. SUMMARY OF WATCHES AND WARNINGS IN EFFECT: There are no coastal watches or warnings in effect. DISCUSSION AND OUTLOOK ---------------------- At 1000 PM CDT (0300 UTC), the center of Tropical Depression Marco was located near latitude 29.0 North, longitude 89.8 West. The depression is moving toward the west near 9 mph (15 km/h). Marco is forecast to continue moving westward near the coast of Louisiana for the next day or so. Maximum sustained winds have decreased to near 35 mph (55 km/h) with higher gusts. Additional weakening is expected, and Marco is forecast to become a remnant low on Tuesday. The system is then forecast to dissipate by early Wednesday. The estimated minimum central pressure is 1007 mb (29.74 inches). HAZARDS AFFECTING LAND ---------------------- RAINFALL: Marco is expected to produce additional rainfall accumulations of 1 to 3 inches with additional isolated totals of 5 inches across portions of the north-central Gulf coast and Southeastern United States through Wednesday. Rain totals related to Marco near Apalachicola, Florida reached as high as 11.81 inches on Sunday per a CoCoRaHS report. The additional rainfall may result in areas of flash, urban and small stream flooding along the same area. SURF: Swells generated by Marco are likely to affect portions of the northern Gulf Coast overnight. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office. TORNADOES: A brief tornado or two remains possible overnight across the Florida Panhandle, southwest Georgia, far southern Alabama, and far southern Mississippi. NEXT ADVISORY ------------- Next complete advisory at 400 AM CDT. $$ Forecaster Zelinsky
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Tropical Depression Marco Wind Speed Probabilities Number 20
2020-08-25 04:31:24| National Hurricane Center (Atlantic)
Issued at 0300 UTC TUE AUG 25 2020 000 FONT14 KNHC 250231 PWSAT4 TROPICAL DEPRESSION MARCO WIND SPEED PROBABILITIES NUMBER 20 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142020 0300 UTC TUE AUG 25 2020 AT 0300Z THE CENTER OF TROPICAL DEPRESSION MARCO WAS LOCATED NEAR LATITUDE 29.0 NORTH...LONGITUDE 89.8 WEST WITH MAXIMUM SUSTAINED WINDS NEAR 30 KTS...35 MPH...55 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 00Z 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 00Z TUE 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT PERIODS TO TO TO TO TO TO TO 12Z TUE 00Z WED 12Z WED 00Z THU 00Z FRI 00Z SAT 00Z SUN FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - LOCATION KT BURAS LA 34 22 X(22) X(22) X(22) X(22) X(22) X(22) NEW ORLEANS LA 34 3 X( 3) X( 3) X( 3) X( 3) X( 3) X( 3) MORGAN CITY LA 34 3 X( 3) X( 3) X( 3) X( 3) X( 3) X( 3) NEW IBERIA LA 34 X 3( 3) X( 3) X( 3) X( 3) X( 3) X( 3) CAMERON LA 34 X 5( 5) X( 5) X( 5) X( 5) X( 5) X( 5) $$ FORECASTER ZELINSKY
Tropical Depression Marco Forecast Advisory Number 20
2020-08-25 04:30:55| National Hurricane Center (Atlantic)
Issued at 0300 UTC TUE AUG 25 2020 000 WTNT24 KNHC 250230 TCMAT4 TROPICAL DEPRESSION MARCO FORECAST/ADVISORY NUMBER 20 NWS NATIONAL HURRICANE CENTER MIAMI FL AL142020 0300 UTC TUE AUG 25 2020 CHANGES IN WATCHES AND WARNINGS WITH THIS ADVISORY... NONE. SUMMARY OF WATCHES AND WARNINGS IN EFFECT... THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT. TROPICAL DEPRESSION CENTER LOCATED NEAR 29.0N 89.8W AT 25/0300Z POSITION ACCURATE WITHIN 30 NM PRESENT MOVEMENT TOWARD THE WEST OR 270 DEGREES AT 8 KT ESTIMATED MINIMUM CENTRAL PRESSURE 1007 MB MAX SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT. 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 29.0N 89.8W AT 25/0300Z AT 25/0000Z CENTER WAS LOCATED NEAR 29.0N 89.3W FORECAST VALID 25/1200Z 29.0N 91.3W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 26/0000Z 29.0N 93.3W...POST-TROP/REMNT LOW MAX WIND 25 KT...GUSTS 35 KT. FORECAST VALID 26/1200Z...DISSIPATED REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 29.0N 89.8W NEXT ADVISORY AT 25/0900Z $$ FORECASTER ZELINSKY
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Summary for Tropical Storm Marco (AT4/AL142020)
2020-08-25 01:01:48| National Hurricane Center (Atlantic)
...MARCO MAKES LANDFALL NEAR THE MOUTH OF THE MISSISSIPPI... ...EXPECTED TO BECOME A TROPICAL DEPRESSION LATER TONIGHT... As of 6:00 PM CDT Mon Aug 24 the center of Marco was located near 29.0, -89.2 with movement WNW at 8 mph. The minimum central pressure was 1006 mb with maximum sustained winds of about 40 mph.
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Tropical Storm Marco Update Statement
2020-08-25 01:01:48| National Hurricane Center (Atlantic)
Issued at 600 PM CDT Mon Aug 24 2020 000 WTNT64 KNHC 242301 TCUAT4 Tropical Storm Marco Tropical Cyclone Update NWS National Hurricane Center Miami FL AL142020 600 PM CDT Mon Aug 24 2020 ...MARCO MAKES LANDFALL NEAR THE MOUTH OF THE MISSISSIPPI... ...EXPECTED TO BECOME A TROPICAL DEPRESSION LATER TONIGHT... Visible satellite imagery and surface observations indicate that Marco made landfall near the mouth of the Mississippi River around 600 PM CDT. Data from an Air Force Reserve Hurricane Hunter Aircraft indicate that Marco is producing a small area of tropical-storm-force winds over water to the northeast of the center. These winds will likely subside during the next few hours as Marco moves along the coast of Louisiana. Heavy rain will continue along portions of the north-central Gulf Coast through tonight. The estimated minimum pressure at the time of landfall was 1006 mb (29.71 inches). SUMMARY OF 600 PM CDT...2300 UTC...INFORMATION ---------------------------------------------- LOCATION...29.0N 89.2W ABOUT 0 MI...0 KM N OF THE MOUTH OF THE MISSISSIPPI RIVER MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H PRESENT MOVEMENT...WNW OR 290 DEGREES AT 8 MPH...13 KM/H MINIMUM CENTRAL PRESSURE...1006 MB...29.71 INCHES $$ Forecaster Zelinsky
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