Alert archive / North Carolina / Flash Flood Warnings in 2021

Flash Flood Warning 38, NWS Wakefield, VA

August 4, 2021Currituck County, North Carolina

NWS Wakefield, VA issued this flash flood warning at Aug 4, 2021, 8:32 AM EDT for Currituck County, North Carolina. It was in force for 118 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 4, 2021, 8:32 AM EDT (12:32 UTC)
Expired: Aug 4, 2021, 10:30 AM EDT
In force: 118 min
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Flood severity: None

County Currituck County, NC

The radar

The Norfolk radar (KAKQ), 122 km from the middle of the area, began a volume at 12:34 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.

What was reported inside it

Time	Report	Where	Remark
Aug 4, 10:00 AM EDT	FLASH FLOOD	3 S Corolla, NC	MESONET SITE REPORTING RAINFALL TOTAL OF 6.76 INCHES SINCE MIDNIGHT. 5.16 INCHES FELL BETWEEN 4 AND 10 AM.
Aug 4, 10:00 AM EDT	FLASH FLOOD	Corolla, NC	WATER OVERFLOWING POND AND COVERING ROADWAY NEAR INTERSECTION OF AUSTIN ST AND VILLA CT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 0.5 hours before the alert went out and 178 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: 60 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 531 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

488 
WGUS51 KAKQ 041232
FFWAKQ
NCC053-041430-
/O.NEW.KAKQ.FF.W.0038.210804T1232Z-210804T1430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
832 AM EDT Wed Aug 4 2021

The National Weather Service in Wakefield has issued a

* Flash Flood Warning for...
  Currituck County in northeastern North Carolina...

* Until 1030 AM EDT.

* At 832 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Between 4 and 6 inches of rain have fallen. 
  Additional rainfall amounts of 0.5 to 1 inch are possible in the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Corolla.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3646 7591 3647 7582 3630 7577 3630 7587
      3635 7589 3634 7587 3635 7586 3636 7587
      3638 7589

FLASH FLOOD...RADAR INDICATED

$$

Poche

The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 4:59 AM EDT	Beach Hazards Statement	AKQ	Currituck	15 hr
Aug 4, 8:15 AM EDT	Areal Flood Advisory	AKQ	Currituck	2 hr

Nearby

Flash Flood Warnings in North Carolina, 2021 Every flash flood warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.