Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 39, NWS Wakefield, VA

August 7, 2021James City County, York County, City of Williamsburg, Virginia

NWS Wakefield, VA issued this flash flood warning at Aug 7, 2021, 2:52 PM EDT for James City County, York County, City of Williamsburg, Virginia. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 7, 2021, 2:52 PM EDT (18:52 UTC)
Expired
Aug 7, 2021, 5:19 PM EDT
In force
2 hr
Issued by
NWS Wakefield, VA
Area
Storm-based polygon
Flood severity
None

Counties City of Williamsburg, VA, James City County, VA, York County, VA

The radar

The Norfolk radar (KAKQ), 41 km from the middle of the area, began a volume at 18:55 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.9 hours before the alert went out and 139 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, Wallops Is Stn, VA at 12:00Z on 2021-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 4 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, Wallops Is Stn, VA at 12:00Z on 2021-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
4 J/kg
Mixed-layer CIN
-213 J/kg
Mixed-layer LCL
836 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

106 
WGUS51 KAKQ 071852
FFWAKQ
VAC095-199-830-072200-
/O.NEW.KAKQ.FF.W.0039.210807T1852Z-210807T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
252 PM EDT Sat Aug 7 2021

The National Weather Service in Wakefield has issued a

* Flash Flood Warning for...
  Southeastern James City County in southeastern Virginia...
  Northwestern York County in southeastern Virginia...
  The City of Williamsburg in southeastern Virginia...

* Until 600 PM EDT.

* At 252 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 3 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2 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...
  Williamsburg, College Of William And Mary, Norge, Queens Lake, 
  Kings Point, York Terrace, Jamestown, Carver Gardens, Ewell, 
  Lightfoot, Oaktree, Skimino, Centerville, Barlows Corner, 
  Williamsburg Airport, Camp Peary, Christensons Corner, Croaker, 
  York River State Park and Water Country U.S.A.

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 3724 7684 3729 7685 3734 7683 3745 7674
      3742 7670 3740 7667 3733 7662 3726 7664
      3718 7675 3720 7679 3722 7680

FLASH FLOOD...RADAR INDICATED

$$

RMM
1 follow-up statement
242 
WGUS71 KAKQ 072119
FFSAKQ

Flash Flood Statement
National Weather Service Wakefield VA
519 PM EDT Sat Aug 7 2021

VAC095-199-830-072129-
/O.CAN.KAKQ.FF.W.0039.000000T0000Z-210807T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
James City VA-York VA-City of Williamsburg VA-
519 PM EDT Sat Aug 7 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHEASTERN JAMES CITY AND 
NORTHWESTERN YORK COUNTIES AND THE CITY OF WILLIAMSBURG...

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

A Flash Flood Watch remains in effect until 1000 PM EDT for portions 
of central Virginia, east central Virginia, eastern Virginia, south 
central Virginia and southeast Virginia.

LAT...LON 3724 7684 3729 7685 3734 7683 3745 7674
      3742 7670 3740 7667 3733 7662 3726 7664
      3718 7675 3720 7679 3722 7680

$$

RMM

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 10:07 AM EDTAreal Flood AdvisoryAKQChesterfield, Henrico5 hr
Aug 7, 10:24 AM EDTAreal Flood AdvisoryAKQNorthampton4 hr
Aug 7, 10:59 AM EDTAreal Flood AdvisoryAKQCity of Richmond5 hr
Aug 7, 11:13 AM EDTAreal Flood AdvisoryAKQCaroline, Hanover, Louisa4 hr
Aug 7, 11:21 AM EDTAreal Flood AdvisoryAKQBrunswick3 hr
Aug 7, 11:51 AM EDTSpecial Marine WarningAKQ84 min
Aug 7, 11:53 AM EDTSpecial Marine WarningAKQ65 min
Aug 7, 11:57 AM EDTSpecial Marine WarningAKQ93 min
Aug 7, 12:09 PM EDTAreal Flood WarningAKQChesterfield, Goochland, Henrico4 hr
Aug 7, 12:11 PM EDTSpecial Weather StatementAKQGreensville, City of Emporia64 min
Aug 7, 12:34 PM EDTAreal Flood AdvisoryAKQEssex, Westmoreland3 hr
Aug 7, 12:52 PM EDTAreal Flood WarningAKQCaroline4 hr
Aug 7, 1:08 PM EDTSpecial Marine WarningAKQ82 min
Aug 7, 1:19 PM EDTAreal Flood AdvisoryAKQChesterfield, Dinwiddie, Prince George, City of Colonial Heights, City of Hopewell, City of Petersburg3 hr
Aug 7, 1:20 PM EDTSpecial Weather StatementAKQSouthampton, City of Franklin55 min
Aug 7, 1:24 PM EDTAreal Flood AdvisoryAKQBrunswick, Dinwiddie, Greensville, Southampton, Sussex, City of Emporia3 hr
Aug 7, 1:24 PM EDTSpecial Marine WarningAKQ96 min
Aug 7, 1:27 PM EDTTornado WarningAKQSouthampton48 min
Aug 7, 1:32 PM EDTSpecial Weather StatementAKQCity of Chesapeake, City of Virginia Beach43 min
Aug 7, 1:32 PM EDTTornado WarningAKQGreensville20 min
Aug 7, 1:42 PM EDTSpecial Marine WarningAKQ93 min
Aug 7, 1:44 PM EDTAreal Flood AdvisoryAKQHanover, Henrico3 hr
Aug 7, 2:02 PM EDTSpecial Marine WarningAKQ43 min
Aug 7, 2:04 PM EDTAreal Flood AdvisoryAKQCharles City, Prince George3 hr
Aug 7, 2:21 PM EDTAreal Flood WarningAKQCharles City, Chesterfield, Prince George, City of Colonial Heights, City of Hopewell, City of Petersburg3 hr
Aug 7, 2:31 PM EDTSpecial Weather StatementAKQCity of Suffolk29 min
Aug 7, 2:32 PM EDTAreal Flood AdvisoryAKQCharles City, Gloucester, James City, New Kent, Surry, York and 2 more3 hr
Aug 7, 2:59 PM EDTSpecial Weather StatementAKQGloucester46 min
Aug 7, 3:03 PM EDTSpecial Marine WarningAKQ57 min
Aug 7, 3:23 PM EDTSpecial Marine WarningAKQ67 min
Aug 7, 3:33 PM EDTAreal Flood AdvisoryAKQCity of Suffolk2 hr
Aug 7, 3:36 PM EDTAreal Flood AdvisoryAKQGloucester, Mathews, Middlesex3 hr
Aug 7, 3:50 PM EDTSpecial Marine WarningAKQ25 min
Aug 7, 4:05 PM EDTAreal Flood AdvisoryAKQAccomack, Northampton5 hr
Aug 7, 4:06 PM EDTSpecial Weather StatementAKQCity of Newport News24 min
Aug 7, 4:23 PM EDTAreal Flood AdvisoryAKQCity of Chesapeake, City of Norfolk, City of Portsmouth, City of Virginia Beach3 hr
Aug 7, 4:30 PM EDTAreal Flood AdvisoryAKQYork, City of Hampton, City of Newport News, City of Poquoson3 hr
Aug 7, 4:36 PM EDTFlash Flood WarningAKQYork, City of Hampton, City of Newport News3 hr
Aug 7, 4:47 PM EDTSpecial Marine WarningAKQ58 min
Aug 7, 4:50 PM EDTSpecial Weather StatementAKQCity of Virginia Beach25 min
Aug 7, 4:54 PM EDTFlash Flood WarningAKQGloucester, Mathews, York3 hr
Aug 7, 5:07 PM EDTSpecial Marine WarningAKQ38 min

Nearby

Flash Flood Warnings in Virginia, 2021Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.