NOAA National Hurricane Center Updates 8/24/2020 4 AM CDT

Tropical Storm Marco Advisory Number 16

NWS National Hurricane Center Miami FL AL142020 400 AM CDT Mon Aug 24 2020

*HURRICANE WARNINGS DISCONTINUED FOR MARCO BUT DANGEROUS STORM SURGE STILL ANTICIPATED*

SUMMARY OF 400 AM CDT 0900 UTC INFORMATION

• LOCATION...27.6N 88.2W
• ABOUT 115 MI...190 KM SSE OF THE MOUTH OF THE MISSISSIPPI RIVER
• MAXIMUM SUSTAINED WINDS...60 MPH...95 KM/H
• PRESENT MOVEMENT...NW OR 325 DEGREES AT 10 MPH...17 KM/H
• MINIMUM CENTRAL PRESSURE...1003 MB...29.62 INCHES

WATCHES AND WARNINGS

CHANGES WITH THIS ADVISORY:

• The Hurricane Warning from Morgan City Louisiana to the Mouth of the Pearl River has been changed to a Tropical Storm Warning.
• The Hurricane Watch for Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans has been discontinued.
• The Tropical Storm Watches west of Intracoastal City Louisiana and from the Mississippi/Alabama border to the Alabama/Florida border have been discontinued.
• All Storm Surge Watches have been discontinued.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Storm Surge Warning is in effect for:

• Morgan City Louisiana to Ocean Springs Mississippi
• Lake Borgne

A Tropical Storm Warning is in effect for:

• Intracoastal City to the Mississippi/Alabama border
• Lake Pontchartrain, Lake Maurepas, and Metropolitan New Orleans

A Storm Surge Warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 hours in the indicated locations. For a depiction of areas at risk, please see the National Weather Service Storm Surge Watch/Warning Graphic, available at hurricanes.gov. This is a life-threatening situation. Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions. Promptly follow evacuation and other instructions from local officials. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area, in this case within 12 to 24 hours. 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 Marco was located near latitude 27.6 North, longitude 88.2 West. Marco is moving toward the northwest near 10 mph (17 km/h). Marco is forecast to approach the coast of Louisiana this afternoon, and then turn westward and move very close to the coast of Louisiana through Tuesday night. Data from the Hurricane Hunter plane indicate that maximum sustained winds have decreased to near 60 mph (95 km/h) with higher gusts. Further weakening is expected, and Marco is forecast to become a tropical depression late on Tuesday and dissipate on Wednesday. Tropical-storm-force winds extend outward up to 105 miles (165 km), primarily northeast of the center. The estimated minimum central pressure is 1003 mb (29.62 inches).

HAZARDS AFFECTING LAND

STORM SURGE: The combination of a dangerous storm surge and the tide will cause normally dry areas near the coast to be flooded by rising waters moving inland from the shoreline. The water could reach the following heights above ground somewhere in the indicated areas if the peak surge occurs at the time of high tide.

Morgan City LA to Ocean Springs MS, including Lake Borgne...2-4 ft

The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and dangerous waves. Surge-related flooding depends on the relative timing of the surge and the tidal cycle, and can vary greatly over short distances. For information specific to your area, please see products issued by your local National Weather Service forecast office.

WIND: Tropical storm conditions are expected to start by this afternoon in portions of the warning area.

RAINFALL: Marco is expected to produce total rainfall accumulations of 3 to 5 inches with isolated maximum amounts of 10 inches across portions of the northeast and north-central Gulf coast through Tuesday. This rainfall may result in areas of flash, urban and small stream flooding along the area.

SURF: Swells generated by Marco are likely to affect portions of the northern Gulf Coast for the next couple of days. These swells are likely to cause life-threatening surf and rip current conditions. Please consult products from your local weather office.

TORNADOES: A couple of tornadoes will be possible today from southeast Louisiana to the western Florida Panhandle.

NEXT ADVISORY

• Next intermediate advisory at 700 AM CDT.
• Next complete advisory at 1000 AM CDT.

TROPICAL STORM LAURA ADVISORY NUMBER 18

TROPICAL STORM LAURA ADVISORY NUMBER 18

NWS NATIONAL HURRICANE CENTER MIAMI FL AL132020 500 AM EDT MON AUG 24 2020

*TROPICAL STORM WARNING ISSUED FOR PORTIONS OF THE FLORIDA KEYS, HEAVY RAINFALL OVER EASTERN CUBA AND JAMAICA WILL SPREAD WESTWARD ACROSS CENTRAL CUBA AND THE CAYMAN ISLANDS TODAY*

SUMMARY OF 500 AM EDT - 0900 UTC - INFORMATION

• LOCATION 20.8N 78.9W
• ABOUT 175 MI 285 KM ESE OF CAYO LARGO
• ABOUT 255 MI 415 KM ESE OF THE ISLE OF YOUTH
• MAXIMUM SUSTAINED WINDS 65 MPH 100 KM/H
• PRESENT MOVEMENT WNW OR 290 DEGREES AT 21 MPH 33 KM/H
• MINIMUM CENTRAL PRESSURE 1000 MB 29.53 INCHES

WATCHES AND WARNINGS

CHANGES WITH THIS ADVISORY:

• A TROPICAL STORM WARNING HAS BEEN ISSUED FOR THE MIDDLE AND LOWER FLORIDA KEYS FROM CRAIG KEY WESTWARD TO KEY WEST.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A TROPICAL STORM WARNING IS IN EFFECT FOR:

• LITTLE CAYMAN AND CAYMAN BRAC
• CUBAN PROVINCES OF CAMAGUEY, LAS TUNAS, HOLGUIN, GUANTANAMO, SANTIAGO DE CUBA, GRANMA, CIEGO DE AVILA, SANCTI SPIRITUS, VILLA CLARA, CIENFUEGOS, MATANZAS, MAYABEQUE, LA HABANA, ARTEMISA, PINAR DEL RIO, AND THE ISLE OF YOUTH
• FLORIDA KEYS FROM CRAIG KEY TO KEY WEST
• DRY TORTUGAS

THE TROPICAL STORM WARNING MEANS THAT TROPICAL STORM CONDITIONS ARE EXPECTED SOMEWHERE WITHIN THE WARNING AREA, IN THIS CASE WITHIN THE NEXT 12 TO 24 HOURS.

A HURRICANE WATCH WILL LIKELY BE REQUIRED FOR PORTIONS OF THE U.S. NORTHWEST GULF COAST AREA BY THIS EVENING.

FOR STORM INFORMATION SPECIFIC TO YOUR AREA IN THE UNITED STATES, INCLUDING POSSIBLE INLAND WATCHES AND WARNINGS, PLEASE MONITOR PRODUCTS ISSUED BY YOUR LOCAL NATIONAL WEATHER SERVICE FORECAST OFFICE. FOR STORM INFORMATION SPECIFIC TO YOUR AREA OUTSIDE OF THE UNITED STATES, PLEASE MONITOR PRODUCTS ISSUED BY YOUR NATIONAL METEOROLOGICAL SERVICE.

DISCUSSION AND OUTLOOK

• AT 500 AM EDT (0900 UTC), THE CENTER OF TROPICAL STORM LAURA WAS LOCATED NEAR LATITUDE 20.8 NORTH, LONGITUDE 78.9 WEST. LAURA IS MOVING TOWARD THE WEST-NORTHWEST NEAR 21 MPH (33 KM/H), AND THIS GENERAL MOTION WITH SOME DECREASE IN FORWARD SPEED IS EXPECTED OVER THE NEXT COUPLE OF DAYS. A TURN TOWARD THE NORTHWEST IS FORECAST BY WEDNESDAY. ON THE FORECAST TRACK, THE CENTER OF LAURA WILL MOVE OVER THE CARIBBEAN SEA JUST OFFSHORE THE SOUTHERN COAST OF CUBA TODAY, AND MOVE INTO THE SOUTHEASTERN GULF OF MEXICO BY EARLY TUESDAY MORNING. LAURA IS THEN FORECAST TO MOVE OVER THE CENTRAL AND NORTHWESTERN GULF OF MEXICO TUESDAY NIGHT AND WEDNESDAY.
• MAXIMUM SUSTAINED WINDS ARE NEAR 65 MPH (100 KM/H) WITH HIGHER GUSTS. GRADUAL STRENGTHENING IS EXPECTED, AND LAURA IS FORECAST TO BECOME A HURRICANE BY EARLY TUESDAY.
• TROPICAL-STORM-FORCE WINDS EXTEND OUTWARD UP TO 175 MILES (280 KM) FROM THE CENTER.
• THE ESTIMATED MINIMUM CENTRAL PRESSURE IS 1000 MB (29.53 INCHES).

HAZARDS AFFECTING LAND

RAINFALL: LAURA IS EXPECTED TO PRODUCE THE FOLLOWING STORM TOTAL RAINFALL ACCUMULATIONS THROUGH TUESDAY:

• JAMAICA AND CUBA: 4 TO 8 INCHES, WITH MAXIMUM AMOUNTS OF 12 INCHES.
• CAYMAN ISLANDS: 2 TO 4 INCHES, MAXIMUM AMOUNTS OF 6 INCHES.
• FLORIDA KEYS, TURKS AND CAICOS ISLANDS, AND THE NORTHWEST BAHAMAS: 1 TO 2 INCHES.
• ACROSS THE GREATER ANTILLES THIS HEAVY RAINFALL COULD LEAD TO LIFE-THREATENING FLASH AND URBAN FLOODING, AND THE POTENTIAL FOR MUDSLIDES.
• FROM LATE WEDNESDAY INTO FRIDAY, LAURA IS EXPECTED TO PRODUCE RAINFALL OF 5 TO 10 INCHES, WITH ISOLATED MAXIMUM AMOUNTS OF 15 INCHES ACROSS PORTIONS OF THE WEST-CENTRAL U.S. GULF COAST NEAR THE TEXAS AND LOUISIANA BORDER NORTH INTO PORTIONS OF THE LOWER MISSISSIPPI VALLEY. THIS RAINFALL COULD CAUSE WIDESPREAD FLASH AND
• URBAN FLOODING, SMALL STREAMS TO OVERFLOW THEIR BANKS, AND THE POSSIBILITY OF SOME MINOR RIVER FLOODING ACROSS THIS REGION.

WIND: TROPICAL STORM CONDITIONS ARE EXPECTED TO SPREAD WESTWARD WITHIN THE WARNING AREA IN CUBA THROUGH TODAY. TROPICAL STORM CONDITIONS ARE EXPECTED IN LITTLE CAYMAN AND CAYMAN BRAC BY THIS AFTERNOON. TROPICAL STORM CONDITIONS ARE ALSO EXPECTED WITHIN THE WARNING AREA IN THE FLORIDA MIDDLE AND LOWER KEYS AND THE DRY TORTUGAS THIS AFTERNOON AND CONTINUING INTO TONIGHT.

SURF: SWELLS GENERATED BY LAURA ARE AFFECTING PORTIONS OF HISPANIOLA, EASTERN CUBA, THE SOUTHEASTERN BAHAMAS AND THE TURKS AND CAICOS ISLANDS. THESE SWELLS ARE EXPECTED TO SPREAD ACROSS CENTRAL AND WESTERN CUBA, THE CENTRAL AND NORTHWESTERN BAHAMAS, AND THE FLORIDA KEYS TODAY. PLEASE CONSULT PRODUCTS FROM YOUR LOCAL WEATHER OFFICE.

TORNADOES: AN ISOLATED TORNADO WILL BE POSSIBLE LATER TODAY INTO TONIGHT ACROSS THE FLORIDA KEYS.

NEXT ADVISORY

• NEXT INTERMEDIATE ADVISORY AT 800 AM EDT.
• NEXT COMPLETE ADVISORY AT 1100 AM EDT.