Alert archive / North Carolina / Flash Flood Watches in 2021

Flash Flood Watch 4, NWS Wilmington, NC

August 3, 20215 counties in North Carolina; 5 counties in South Carolina

NWS Wilmington, NC issued this flash flood watch at Aug 3, 2021, 3:20 AM EDT for 5 counties in North Carolina; 5 counties in South Carolina. It took effect at Aug 4, 2021, 12:00 PM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Aug 3, 2021, 3:20 AM EDT (07:20 UTC)
In effect from
Aug 4, 2021, 12:00 PM EDT
Expired
Aug 3, 2021, 3:24 AM EDT
In force
Issued by
NWS Wilmington, NC
Flood severity
None

Counties Bladen County, NC, Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Pender County, NC, Florence County, SC, Georgetown County, SC, Horry County, SC, Marion County, SC, Williamsburg County, SC

The radar

The Wilmington radar (KLTX), 38 km from the middle of the area, began a volume at 07:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 7.3 hours before the alert went out and 169 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Charleston AFB, SC at 00:00Z on 2021-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1210 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 00:00Z on 2021-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -48 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1210 J/kg
Mixed-layer CIN
-23 J/kg
Mixed-layer LCL
850 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-48 m²/s²
0-3 km storm-relative helicity
-19 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

075 
WGUS62 KILM 030720
FFAILM

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Wilmington NC
320 AM EDT Tue Aug 3 2021

NCZ096-099-105>110-SCZ032-033-039-054>056-058-059-031930-
/O.NEW.KILM.FF.A.0004.210804T1600Z-210805T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bladen-Columbus-Inland Pender-Coastal Pender-Inland New Hanover-
Coastal New Hanover-Inland Brunswick-Coastal Brunswick-Florence-
Marion-Williamsburg-Coastal Horry-Inland Georgetown-Coastal
Georgetown-Central Horry-Northern Horry-
Including the cities of Carolina Beach, Boiling Spring Lakes, 
Shallotte, Burgaw, Masonboro, Georgetown, Murrells Inlet, Seagate, 
Bladenboro, Kingstree, Garden City, Oak Island, Myrtle Beach, 
Mullins, Little River, Southport, Socastee, Loris, Ogden, 
Wilmington, Lake Waccamaw, Surf City, Chadbourn, North Myrtle Beach, 
Green Sea, Leland, Tabor City, Whiteville, Myrtle Grove, Conway, 
Longs, Bucksport, Long Beach, Marion, Andrews, Aynor, Sunset Beach, 
Florence, and Elizabethtown
320 AM EDT Tue Aug 3 2021

...FLASH FLOOD WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH 
WEDNESDAY EVENING...

The National Weather Service in Wilmington has issued a

* Flash Flood Watch for portions of southeast North Carolina and 
  northeast South Carolina, including the following areas, in 
  southeast North Carolina, Bladen, Coastal Brunswick, Coastal New 
  Hanover, Coastal Pender, Columbus, Inland Brunswick, Inland New 
  Hanover and Inland Pender. In northeast South Carolina, Central 
  Horry, Coastal Georgetown, Coastal Horry, Florence, Inland 
  Georgetown, Marion, Northern Horry and Williamsburg.

* From Wednesday afternoon through Wednesday evening.

* A wave of low pressure will move up along a stalled front over the 
  Carolina coast bringing periods of torrential rain in showers and 
  thunderstorms this afternoon through this evening. Expect rainfall 
  totals of 2 to 4 inches mainly east of I-95 with localized greater 
  amounts, especially closer to the coast. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Watch means that conditions may develop that lead to 
flash flooding. You should closely monitor this potentially 
dangerous weather situation. Be prepared to take action should Flash 
Flood Warnings be issued for your area, and never drive through 
flooded roadways.

&&

$$

RGZ
1 follow-up statement
498 
WGUS62 KILM 030724
FFAILM

Flood Watch
National Weather Service Wilmington NC
324 AM EDT Tue Aug 3 2021

NCZ096-099-105>110-SCZ032-033-039-054>056-058-059-030830-
/O.CAN.KILM.FF.A.0004.210804T1600Z-210805T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bladen-Columbus-Inland Pender-Coastal Pender-Inland New Hanover-
Coastal New Hanover-Inland Brunswick-Coastal Brunswick-Florence-
Marion-Williamsburg-Coastal Horry-Inland Georgetown-Coastal
Georgetown-Central Horry-Northern Horry-
Including the cities of Carolina Beach, Boiling Spring Lakes, 
Shallotte, Burgaw, Masonboro, Georgetown, Murrells Inlet, Seagate, 
Bladenboro, Kingstree, Garden City, Oak Island, Myrtle Beach, 
Mullins, Little River, Southport, Socastee, Loris, Ogden, 
Wilmington, Lake Waccamaw, Surf City, Chadbourn, North Myrtle Beach, 
Green Sea, Leland, Tabor City, Whiteville, Myrtle Grove, Conway, 
Longs, Bucksport, Long Beach, Marion, Andrews, Aynor, Sunset Beach, 
Florence, and Elizabethtown
324 AM EDT Tue Aug 3 2021

...FLASH FLOOD WATCH IS CANCELLED 

The Flash Flood Watch for portions of southeast North Carolina and 
northeast South Carolina, including the following areas, in 
southeast North Carolina, Bladen, Coastal Brunswick, Coastal New 
Hanover, Coastal Pender, Columbus, Inland Brunswick, Inland New 
Hanover and Inland Pender. In northeast South Carolina, Central 
Horry, Coastal Georgetown, Coastal Horry, Florence, Inland 
Georgetown, Marion, Northern Horry and Williamsburg has been 
cancelled.

This Flash Flood Watch is cancelled for Wednesday and will be re-

$$

RGZ

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 3, 3:30 AM EDTFlash Flood WatchILMBladen, Brunswick, Columbus, New Hanover, Pender24 hr
Aug 3, 3:23 PM EDTAreal Flood AdvisoryILMBladen, Brunswick, Columbus, New Hanover, Pender112 min
Aug 3, 4:08 PM EDTSmall Craft AdvisoryILM12 hr
Aug 3, 5:33 PM EDTAreal Flood AdvisoryILMColumbus81 min
Aug 3, 7:54 PM EDTAreal Flood AdvisoryILMBrunswick2 hr
Aug 3, 11:38 AM EDTAreal Flood AdvisoryILMFlorence, Marion85 min
Aug 3, 12:01 PM EDTAreal Flood AdvisoryILMGeorgetown, Horry103 min
Aug 3, 12:55 PM EDTFlash Flood WarningILMDarlington, Dillon, Florence, Marion3 hr
Aug 3, 1:12 PM EDTFlash Flood WarningILMHorry2 hr
Aug 3, 4:00 PM EDTFlash Flood WarningILMDillon, Marion56 min
Aug 3, 4:04 PM EDTAreal Flood AdvisoryILMHorry86 min

Nearby

Flash Flood Watches in North Carolina, 2021Flash Flood Watches in South Carolina, 2021Every flash flood watch in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.