Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 48, NWS Wakefield, VA

August 15, 2021Hanover County, Henrico County, Virginia

NWS Wakefield, VA issued this flash flood warning at Aug 15, 2021, 8:42 PM EDT for Hanover County, Henrico County, Virginia. It was in force for 3 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 15, 2021, 8:42 PM EDT (00:42 UTC)
Expired
Aug 15, 2021, 11:45 PM EDT
In force
3 hr
Issued by
NWS Wakefield, VA
Area
Storm-based polygon
Flood severity
None

Counties Hanover County, VA, Henrico County, VA

The radar

The Norfolk radar (KAKQ), 88 km from the middle of the area, began a volume at 00:42 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.7 hours before the alert went out and 149 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, Washington/Dulle, VA at 00:00Z on 2021-08-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 00:00Z on 2021-08-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1450 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

532 
WGUS51 KAKQ 160042
FFWAKQ
VAC085-087-160345-
/O.NEW.KAKQ.FF.W.0048.210816T0042Z-210816T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
842 PM EDT Sun Aug 15 2021

The National Weather Service in Wakefield has issued a

* Flash Flood Warning for...
  Central Hanover County in central Virginia...
  Northwestern Henrico County in central Virginia...

* Until 1145 PM EDT.

* At 842 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 2 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...
  Tuckahoe, Laurel, Wyndham, Glen Allen, Short Pump, Elmont and 
  Longdale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding. Do not stay in areas subject to flooding when 
water begins rising.

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 3771 7763 3773 7751 3771 7745 3764 7747
      3760 7758 3756 7758 3756 7765 3757 7763
      3757 7764 3758 7763 3758 7762 3759 7762
      3759 7763 3760 7763 3760 7764 3761 7764
      3761 7765

FLASH FLOOD...RADAR INDICATED

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 15, 8:05 PM EDTFlash Flood WarningAKQChesterfield, City of Richmond3 hr
Aug 15, 8:21 PM EDTAreal Flood AdvisoryAKQGoochland, Hanover, Henrico, Powhatan3 hr
Aug 15, 10:17 PM EDTAreal Flood AdvisoryAKQChesterfield, Hanover, Henrico, City of Richmond118 min
Aug 16, 2:43 AM EDTAreal Flood AdvisoryAKQChesterfield, Henrico, City of Richmond3 hr
Aug 16, 3:29 AM EDTAreal Flood AdvisoryAKQChesterfield, Prince George, City of Colonial Heights, City of Hopewell, City of Petersburg6 hr
Aug 16, 3:33 AM EDTAreal Flood AdvisoryAKQSouthampton2 hr
Aug 16, 6:11 AM EDTAreal Flood AdvisoryAKQAmelia, Chesterfield4 hr
Aug 16, 8:18 AM EDTFlash Flood WatchAKQCharles City, Chesterfield, Essex, Gloucester, Hanover, Henrico and 18 more12 hr
Aug 16, 8:41 AM EDTAreal Flood AdvisoryAKQJames City, City of Williamsburg2 hr
Aug 16, 1:22 PM EDTAreal Flood AdvisoryAKQCity of Richmond5 hr
Aug 16, 1:47 PM EDTSpecial Weather StatementAKQCity of Norfolk, City of Portsmouth43 min
Aug 16, 2:00 PM EDTAreal Flood AdvisoryAKQIsle of Wight, Surry, York, City of Newport News3 hr
Aug 16, 2:09 PM EDTAreal Flood AdvisoryAKQCity of Chesapeake, City of Norfolk, City of Portsmouth38 min
Aug 16, 2:37 PM EDTFlash Flood WarningAKQIsle of Wight, Surry, York, City of Newport News3 hr
Aug 16, 2:46 PM EDTFlash Flood WarningAKQCity of Chesapeake, City of Norfolk, City of Portsmouth2 hr
Aug 16, 3:00 PM EDTAreal Flood AdvisoryAKQCity of Chesapeake, City of Virginia Beach3 hr
Aug 16, 3:13 PM EDTAreal Flood AdvisoryAKQHenrico2 hr
Aug 16, 3:36 PM EDTFlash Flood WarningAKQHenrico3 hr
Aug 16, 3:39 PM EDTSpecial Weather StatementAKQCaroline, Essex, Richmond, Westmoreland51 min
Aug 16, 4:51 PM EDTAreal Flood AdvisoryAKQChesterfield, Henrico, City of Richmond114 min
Aug 16, 5:03 PM EDTFlash Flood WarningAKQChesterfield, Henrico, City of Richmond3 hr
Aug 16, 5:53 PM EDTAreal Flood AdvisoryAKQChesterfield112 min
Aug 16, 6:35 PM EDTSpecial Weather StatementAKQGreensville, City of Emporia55 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.