Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 50, NWS Wakefield, VA

August 16, 2021City of Chesapeake, City of Norfolk, City of Portsmouth, Virginia

NWS Wakefield, VA issued this flash flood warning at Aug 16, 2021, 2:46 PM EDT for City of Chesapeake, City of Norfolk, City of Portsmouth, Virginia. It was in force for 2 hr. 3 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 16, 2021, 2:46 PM EDT (18:46 UTC)
Expired: Aug 16, 2021, 5:15 PM EDT
In force: 2 hr
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Flood severity: None

Counties City of Chesapeake, VA, City of Norfolk, VA, City of Portsmouth, VA

The radar

The Norfolk radar (KAKQ), 58 km from the middle of the area, began a volume at 18:49 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 16, 4:00 PM EDT	FLASH FLOOD	Downtown Norfolk, VA	FLOODING REPORTED VIA SOCIAL MEDIA WITH ROADS IMPASSIBLE.
Aug 16, 4:00 PM EDT	FLASH FLOOD	Downtown Portsmout, VA	FLOODING ALONG LONDON BOULEVARD REPORTED VIA SOCIAL MEDIA.
Aug 16, 4:00 PM EDT	HEAVY RAIN 2.73	1 Nw Cradock, VA	PRECIP TOTAL 1-4PM.

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, 6.8 hours before the alert went out and 142 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: 28 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

213 
WGUS51 KAKQ 161846
FFWAKQ
VAC550-710-740-162145-
/O.NEW.KAKQ.FF.W.0050.210816T1846Z-210816T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
246 PM EDT Mon Aug 16 2021

The National Weather Service in Wakefield has issued a

* Flash Flood Warning for...
  The Northwestern City of Chesapeake in southeastern Virginia...
  The City of Norfolk in southeastern Virginia...
  The City of Portsmouth in southeastern Virginia...

* Until 545 PM EDT.

* At 246 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2.5 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2.5 inches 
  are 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...
  Old Dominion University, Downtown Portsmouth, Downtown Norfolk, 
  Churchland, Norfolk State University, Deep Creek, Ocean View, 
  Norfolk, Chesapeake, Portsmouth, Suffolk, Ghent, Cradock, Western 
  Branch, Norfolk NAS, Norview, Bowers Hill, South Norfolk, Wards 
  Corner and Willoughby Spit.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3689 7640 3690 7641 3690 7642 3694 7638
      3694 7636 3697 7636 3698 7635 3700 7630
      3699 7626 3696 7622 3671 7631 3677 7646
      3683 7645

FLASH FLOOD...RADAR INDICATED

$$

Rogers

1 follow-up statement

285 
WGUS71 KAKQ 162115
FFSAKQ

Flash Flood Statement
National Weather Service Wakefield VA
515 PM EDT Mon Aug 16 2021

VAC550-710-740-162125-
/O.CAN.KAKQ.FF.W.0050.000000T0000Z-210816T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
City of Chesapeake VA-City of Norfolk VA-City of Portsmouth VA-
515 PM EDT Mon Aug 16 2021

...FLASH FLOOD WARNING IS CANCELLED FOR THE NORTHWESTERN CITY OF 
CHESAPEAKE, THE CITY OF NORFOLK AND THE CITY OF PORTSMOUTH...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3689 7640 3690 7641 3690 7642 3694 7638
      3694 7636 3697 7636 3698 7635 3700 7630
      3699 7626 3696 7622 3671 7631 3677 7646
      3683 7645

$$

JO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 8:05 PM EDT	Flash Flood Warning	AKQ	Chesterfield, City of Richmond	3 hr
Aug 15, 8:21 PM EDT	Areal Flood Advisory	AKQ	Goochland, Hanover, Henrico, Powhatan	3 hr
Aug 15, 8:42 PM EDT	Flash Flood Warning	AKQ	Hanover, Henrico	3 hr
Aug 15, 10:17 PM EDT	Areal Flood Advisory	AKQ	Chesterfield, Hanover, Henrico, City of Richmond	118 min
Aug 16, 2:43 AM EDT	Areal Flood Advisory	AKQ	Chesterfield, Henrico, City of Richmond	3 hr
Aug 16, 3:29 AM EDT	Areal Flood Advisory	AKQ	Chesterfield, Prince George, City of Colonial Heights, City of Hopewell, City of Petersburg	6 hr
Aug 16, 3:33 AM EDT	Areal Flood Advisory	AKQ	Southampton	2 hr
Aug 16, 6:11 AM EDT	Areal Flood Advisory	AKQ	Amelia, Chesterfield	4 hr
Aug 16, 8:18 AM EDT	Flash Flood Watch	AKQ	Charles City, Chesterfield, Essex, Gloucester, Hanover, Henrico and 18 more	12 hr
Aug 16, 8:41 AM EDT	Areal Flood Advisory	AKQ	James City, City of Williamsburg	2 hr
Aug 16, 1:22 PM EDT	Areal Flood Advisory	AKQ	City of Richmond	5 hr
Aug 16, 1:47 PM EDT	Special Weather Statement	AKQ	City of Norfolk, City of Portsmouth	43 min
Aug 16, 2:00 PM EDT	Areal Flood Advisory	AKQ	Isle of Wight, Surry, York, City of Newport News	3 hr
Aug 16, 2:09 PM EDT	Areal Flood Advisory	AKQ	City of Chesapeake, City of Norfolk, City of Portsmouth	38 min
Aug 16, 2:37 PM EDT	Flash Flood Warning	AKQ	Isle of Wight, Surry, York, City of Newport News	3 hr
Aug 16, 3:00 PM EDT	Areal Flood Advisory	AKQ	City of Chesapeake, City of Virginia Beach	3 hr
Aug 16, 3:13 PM EDT	Areal Flood Advisory	AKQ	Henrico	2 hr
Aug 16, 3:36 PM EDT	Flash Flood Warning	AKQ	Henrico	3 hr
Aug 16, 3:39 PM EDT	Special Weather Statement	AKQ	Caroline, Essex, Richmond, Westmoreland	51 min
Aug 16, 4:51 PM EDT	Areal Flood Advisory	AKQ	Chesterfield, Henrico, City of Richmond	114 min
Aug 16, 5:03 PM EDT	Flash Flood Warning	AKQ	Chesterfield, Henrico, City of Richmond	3 hr
Aug 16, 5:53 PM EDT	Areal Flood Advisory	AKQ	Chesterfield	112 min
Aug 16, 6:35 PM EDT	Special Weather Statement	AKQ	Greensville, City of Emporia	55 min

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.