Alert archive / North Carolina / Flash Flood Watches in 2021

Flash Flood Watch 3, NWS Wilmington, NC

July 19, 20214 counties in North Carolina; Horry County, South Carolina

NWS Wilmington, NC issued this flash flood watch at Jul 19, 2021, 11:55 AM EDT for 4 counties in North Carolina; Horry County, South Carolina. It took effect at Jul 19, 2021, 2:00 PM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 19, 2021, 11:55 AM EDT (15:55 UTC)
In effect from: Jul 19, 2021, 2:00 PM EDT
Expired: Jul 19, 2021, 10:01 PM EDT
In force: 8 hr
Issued by: NWS Wilmington, NC
Flood severity: None

Counties Brunswick County, NC, Columbus County, NC, New Hanover County, NC, Pender County, NC, Horry County, SC

The radar

The Wilmington radar (KLTX), 23 km from the middle of the area, began a volume at 15:54 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

Newport, NC (KMHX), launched 12:00Z, 3.9 hours before the alert went out and 148 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 207 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 741 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

667 
WGUS62 KILM 191555
FFAILM

URGENT - IMMEDIATE BROADCAST REQUESTED
Flood Watch
National Weather Service Wilmington NC
1155 AM EDT Mon Jul 19 2021

NCZ099-105>110-SCZ054-058-059-200300-
/O.NEW.KILM.FF.A.0003.210719T1800Z-210720T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Columbus-Inland Pender-Coastal Pender-Inland New Hanover-Coastal New
Hanover-Inland Brunswick-Coastal Brunswick-Coastal Horry-Central
Horry-Northern Horry-
Including the cities of Carolina Beach, Boiling Spring Lakes, 
Shallotte, Burgaw, Masonboro, Seagate, Garden City, Oak Island, 
North Myrtle Beach, Little River, Southport, Socastee, Loris, Ogden, 
Wilmington, Lake Waccamaw, Surf City, Chadbourn, Leland, Tabor City, 
Whiteville, Myrtle Grove, Conway, Longs, Bucksport, Long Beach, 
Myrtle Beach, Green Sea, Aynor, and Sunset Beach
1155 AM EDT Mon Jul 19 2021

...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT...

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, Coastal Brunswick, Coastal New Hanover, 
  Coastal Pender, Columbus, Inland Brunswick, Inland New Hanover and 
  Inland Pender. In northeast South Carolina, Central Horry, Coastal 
  Horry and Northern Horry.

* Through late tonight.

* Showers and thunderstorms are expected to redevelop across the 
  area this afternoon through evening ahead of a slow moving front. 
  An additional one to two inches of rainfall with isolated higher 
  amounts is possible.

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.

&&

$$

MW

1 follow-up statement

411 
WGUS62 KILM 200201
FFAILM

Flood Watch
National Weather Service Wilmington NC
1001 PM EDT Mon Jul 19 2021

NCZ099-105>110-SCZ054-058-059-200315-
/O.CAN.KILM.FF.A.0003.000000T0000Z-210720T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Columbus-Inland Pender-Coastal Pender-Inland New Hanover-Coastal New
Hanover-Inland Brunswick-Coastal Brunswick-Coastal Horry-Central
Horry-Northern Horry-
Including the cities of Carolina Beach, Boiling Spring Lakes, 
Shallotte, Burgaw, Masonboro, Seagate, Garden City, Oak Island, 
North Myrtle Beach, Little River, Southport, Socastee, Loris, Ogden, 
Wilmington, Lake Waccamaw, Surf City, Chadbourn, Leland, Tabor City, 
Whiteville, Myrtle Grove, Conway, Longs, Bucksport, Long Beach, 
Myrtle Beach, Green Sea, Aynor, and Sunset Beach
1001 PM EDT Mon Jul 19 2021

...FLASH FLOOD WATCH IS CANCELLED...

The Flash Flood Watch for portions of southeast North Carolina and 
northeast South Carolina has been canceled.

The watch previously included Brunswick, New Hanover, Columbus, 
Pender, and Horry counties.

The Flash Flood Watch is cancelled. Flooding is no longer expected 
to pose a significant threat. Please continue to heed any remaining 
road closures.

$$

TRA

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 9:20 AM EDT	Special Marine Warning	ILM		40 min
Jul 19, 10:18 AM EDT	Areal Flood Advisory	ILM	Brunswick, New Hanover	103 min
Jul 19, 4:16 PM EDT	Areal Flood Advisory	ILM	Bladen, Columbus	3 hr
Jul 19, 5:43 PM EDT	Areal Flood Advisory	ILM	Robeson	62 min
Jul 19, 6:01 PM EDT	Areal Flood Advisory	ILM	Pender	96 min
Jul 19, 6:32 PM EDT	Flash Flood Warning	ILM	Columbus	58 min
Jul 19, 7:40 PM EDT	Areal Flood Advisory	ILM	Brunswick, Columbus, New Hanover, Pender	115 min
Jul 19, 3:28 PM EDT	Areal Flood Advisory	ILM	Dillon	81 min
Jul 19, 6:14 PM EDT	Special Weather Statement	ILM	Georgetown	61 min

Nearby

Flash Flood Watches in North Carolina, 2021 Flash Flood Watches in South Carolina, 2021 Every 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.