Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 25, NWS Wakefield, VA

June 21, 2021City of Chesapeake, City of Portsmouth, City of Suffolk, Virginia

NWS Wakefield, VA issued this flash flood warning at Jun 21, 2021, 8:06 AM EDT for City of Chesapeake, City of Portsmouth, City of Suffolk, Virginia. It was in force for 3 hr. 1 report 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: Jun 21, 2021, 8:06 AM EDT (12:06 UTC)
Expired: Jun 21, 2021, 11:00 AM EDT
In force: 3 hr
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Flood severity: None

Counties City of Chesapeake, VA, City of Portsmouth, VA, City of Suffolk, VA

The radar

The Norfolk radar (KAKQ), 63 km from the middle of the area, began a volume at 12:09 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
Jun 21, 8:20 AM EDT	FLASH FLOOD	2 N Deep Creek, VA	RIGHT LANE ON EAST BOUND INTERSTATE 64 CLOSED DUE TO HEAVY RAINFALL AT MM 297 (YADKIN RD).

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, 0.1 hours before the alert went out and 157 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: 525 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 630 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

239 
WGUS51 KAKQ 211206
FFWAKQ
VAC550-740-800-211500-
/O.NEW.KAKQ.FF.W.0025.210621T1206Z-210621T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
806 AM EDT Mon Jun 21 2021

The National Weather Service in Wakefield has issued a

* Flash Flood Warning for...
  The Western City of Chesapeake in southeastern Virginia...
  The Southeastern City of Portsmouth in southeastern Virginia...
  The Southeastern City of Suffolk in southeastern Virginia...

* Until 1100 AM EDT.

* At 806 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen...with additional rainfall amounts of 0.5 to 1 inch 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  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...
  Deep Creek, Downtown Portsmouth, Norfolk, Chesapeake, Portsmouth, 
  Suffolk, Bowers Hill, Cradock, Herberts Corner, Saunders, Portlock 
  and South Norfolk.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3655 7649 3655 7662 3665 7658 3679 7642
      3686 7635 3684 7629 3684 7630 3683 7629
      3682 7629 3682 7628 3683 7628 3683 7627
      3682 7626 3682 7625 3665 7633 3657 7646

FLASH FLOOD...RADAR INDICATED

$$

05

1 follow-up statement

656 
WGUS71 KAKQ 211453
FFSAKQ

Flash Flood Statement
National Weather Service Wakefield VA
1053 AM EDT Mon Jun 21 2021

VAC550-740-800-211503-
/O.EXP.KAKQ.FF.W.0025.000000T0000Z-210621T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
City of Chesapeake VA-City of Portsmouth VA-City of Suffolk VA-
1053 AM EDT Mon Jun 21 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 11 AM EDT THIS MORNING FOR THE 
WESTERN CITY OF CHESAPEAKE, THE SOUTHEASTERN CITY OF PORTSMOUTH AND 
THE SOUTHEASTERN CITY OF SUFFOLK...

The heavy rain has ended. Flooding is no longer expected to pose an 
immediate threat. However, standing water will take time to recede. 
Please continue to heed remaining road closures.

LAT...LON 3655 7649 3655 7662 3665 7658 3679 7642
      3686 7635 3684 7629 3684 7630 3683 7629
      3682 7629 3682 7628 3683 7628 3683 7627
      3682 7626 3682 7625 3665 7633 3657 7646

$$

RMM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 7:35 AM EDT	Special Weather Statement	AKQ	City of Chesapeake	55 min
Jun 21, 4:26 PM EDT	Small Craft Advisory	AKQ		33 hr

Nearby

Flash Flood Warnings in Virginia, 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.