Tropical Storm Debby Intermediate Advisory Number 21A

000
WTNT34 KNHC 071746
TCPAT4

BULLETIN
Tropical Storm Debby Intermediate Advisory Number 21A
NATIONAL WEATHER SERVICE, National Hurricane Center Miami FLORIDA AL042024
2:00 P.M. EASTERN DAYLIGHT TIME Wed Aug 07 2024

• DEBBY STILL MOVING SLOWLY
• MAJOR FLOOD THREAT CONTINUES FOR PORTIONS OF THE CAROLINAS

SUMMARY OF 2:00 P.M. EASTERN DAYLIGHT TIME 18:00 COORDINATED UNIVERSAL TIME INFORMATION
LOCATION 32.4 NORTH 79.1 WEST
ABOUT 55 MILES, 85 KILOMETERS EAST SOUTHEAST OF CHARLESTON SOUTH CAROLINA
ABOUT 90 MILES, 145 KILOMETERS SOUTH, OF MYRTLE BEACH SOUTH CAROLINA
MAXIMUM SUSTAINED WINDS 60 MILES PER HOUR, 95 KILOMETERS PER HOUR
PRESENT MOVEMENT NORTHEAST, OR 40 DEGREES AT 3 MILES PER HOUR, 6 KILOMETERS PER HOUR
MINIMUM CENTRAL PRESSURE 995 MILLIBAR, 29.39 INCHES

WATCHES AND WARNINGS

• CHANGES WITH THIS ADVISORY:
  The Storm Surge Watch from north of South Santee River, South Carolina to Cape Fear, North Carolina is discontinued.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Tropical Storm Warning is in effect for

• North of the Savannah River to Surf City, North Carolina

A Tropical Storm Watch is in effect for

• North of Surf City, North Carolina to Beaufort Inlet, North Carolina

1. A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area.
2. A Tropical Storm Watch means that tropical storm conditions are possible within the watch area.
   Interests elsewhere along the southeastern coast of the United States should monitor the progress of this system.
3. 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 2:00 P.M. EASTERN DAYLIGHT TIME (18:00 COORDINATED UNIVERSAL TIME), the center of Tropical Storm Debby was located near latitude 32.4 North, longitude 79.1 West.
• Debby has been drifting northeastward near 3 MILES PER HOUR, (6 KILOMETERS PER HOUR).
• A generally northward motion is expected later today, bringing the center to the South Carolina coast on Thursday morning.
• After crossing the coast, a faster motion toward the north and north northeast across the Carolinas and the U.S. Mid Atlantic states is expected on Thursday and Friday.
• Maximum sustained winds are near 60 MILES PER HOUR, (95 KILOMETERS PER HOUR) with higher gusts.
• Some strengthening is possible today or tonight before the center of Debby reaches the coast of South Carolina.
• Weakening is forecast to begin on Thursday after the center moves inland.
• Debby is expected to merge with a frontal boundary over the U.S. Mid Atlantic states on Friday.
• Tropical storm force winds extend outward up to 185 miles (295 KILOMETERS) from the center.
• The estimated minimum central pressure is 995 MILLIBAR, (29.39 inches).

HAZARDS AFFECTING LAND

Key messages for Debby can be found in the Tropical Cyclone Discussion under AWIPS header MIATCDAT4 and WMO header WTNT44 KNHC.

WIND:

• Tropical storm conditions are expected to continue along the coast of South Carolina within the tropical storm warning area through Thursday.
• Tropical storm conditions are expected within the tropical storm warning area and possible within the tropical storm watch area in North Carolina today and continuing through Thursday.

STORM SURGE:

• The combination of storm surge and 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 South Santee River to Ocracoke Inlet including the Neuse and Pamlico Rivers 1 to 3 ft For a complete depiction of areas at risk of storm surge inundation, please see the National Weather Service Peak Storm Surge Graphic, available at

hurricanes.gov/graphics_at4.shtml?peakSurge

RAINFALL:

• Debby is expected to produce an additional 3 to 9 inches of rainfall with locally higher amounts, leading to maximum storm total amounts as high as 25 inches in South Carolina and 15 inches in southeast North Carolina, broadening the area of considerable flooding across portions of South Carolina and southeast North Carolina through Friday.
• An additional 1 to 2 inches of rainfall with locally higher amounts is possible across southeast Georgia through Thursday, bringing overall storm total amounts as high as 15 inches, which may aggravate any ongoing flooding conditions.
• From the Piedmont of South Carolina northward across portions of Virginia, 3 to 7 inches with local amounts to 10 inches, are expected through Friday.
• This rainfall will likely result in areas of considerable flash and urban flooding, with river flooding possible.
• From Maryland north through Upstate New York and Vermont, 2 to 4 inches, with local amounts to 6 inches, are expected through Saturday morning.
• This will likely produce considerable flash and urban flooding as well as river flooding.
• For a complete depiction of forecast rainfall and flash flooding associated with Debby, please see the National Weather Service Storm Total Rainfall Graphic, available at

hurricanes.gov/graphics_at4.shtml?rainqpf

• and the Flash Flood Risk graphic at

hurricanes.gov/graphics_at4.shtml?ero

• For a list of rainfall observations (and wind reports) associated this storm, see the companion storm summary at WBCSCCNS4 with the WMO header ACUS44 KWBC or at the following link:

www.wpc.ncep.noaa.gov/discussions/nfdscc4.html

TORNADOES:

• A tornado or two may occur over eastern North Carolina and extreme eastern South Carolina through tonight.

SURF:

• Large swells will continue to affect the Southeast U.S. coast through the end of the week.
• These conditions are likely to cause life threatening surf and rip current conditions.
• Please consult products from your local weather office.

NEXT ADVISORY

Next complete advisory at 5:00 P.M. EASTERN DAYLIGHT TIME

$$

Forecaster Pasch

Originally Posted at:
NATIONAL HURRICANE CENTER and CENTRAL PACIFIC HURRICANE CENTER
At The NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

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