Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 63, NWS Wakefield, VA

September 16, 2021Hanover County, Henrico County, Virginia

NWS Wakefield, VA issued this flash flood warning at Sep 16, 2021, 3:51 PM EDT for Hanover County, Henrico County, Virginia. It was in force for 2 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: Sep 16, 2021, 3:51 PM EDT (19:51 UTC)
Expired: Sep 16, 2021, 5:52 PM EDT
In force: 2 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), 65 km from the middle of the area, began a volume at 19:55 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.

What was reported inside it

Time	Report	Where	Remark
Sep 16, 4:27 PM EDT	FLASH FLOOD	Montrose, VA	HIGH WATER AT WILLIAMSBURG RD AND CHARLES CITY RD. REPORT VIA WAZE.

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.9 hours before the alert went out and 163 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: 153 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 830 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

005 
WGUS51 KAKQ 161951
FFWAKQ
VAC085-087-162300-
/O.NEW.KAKQ.FF.W.0063.210916T1951Z-210916T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
351 PM EDT Thu Sep 16 2021

The National Weather Service in Wakefield has issued a

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

* Until 700 PM EDT.

* At 351 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2.5 inches of 
  rain have fallen. The expected rainfall rate is 1.5 to 2.5 inches 
  in 1 hour. 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...
  Richmond, Highland Springs, Mechanicsville, East Highland Park, 
  Bensley, Richmond International, Fair Oaks, Montrose, Sandston, 
  Varina, Richmond Heights and Chamberlayne.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3765 7742 3755 7723 3754 7723 3738 7732
      3738 7736 3739 7736 3739 7737 3738 7738
      3742 7740 3742 7741 3744 7743 3745 7742
      3747 7742 3751 7740 3751 7739 3752 7739
      3753 7739 3755 7740 3762 7742

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1.5-2.5 INCHES IN 1 HOUR

$$

EI

2 follow-up statements

325 
WGUS71 KAKQ 162034
FFSAKQ

Flash Flood Statement
National Weather Service Wakefield VA
434 PM EDT Thu Sep 16 2021

VAC085-087-162300-
/O.CON.KAKQ.FF.W.0063.000000T0000Z-210916T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hanover VA-Henrico VA-
434 PM EDT Thu Sep 16 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 PM EDT THIS EVENING 
FOR SOUTH CENTRAL HANOVER AND EASTERN HENRICO COUNTIES...

At 434 PM EDT, the public reported high water at the intersection of 
Williamsburg and Charles City Road. Between 2 and 2.5 inches of rain 
have fallen. Flash flooding is already occurring. While the heaviest 
rain has ended, the threat for flooding will continue for at least 
another hour or two.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public reported.

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...
  Richmond, Highland Springs, Mechanicsville, East Highland Park, 
  Bensley, Richmond International, Fair Oaks, Montrose, Sandston, 
  Varina, Richmond Heights and Chamberlayne.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3765 7742 3755 7723 3754 7723 3738 7732
      3738 7736 3739 7736 3739 7737 3738 7738
      3742 7740 3742 7741 3744 7743 3745 7742
      3747 7742 3751 7740 3751 7739 3752 7739
      3753 7739 3755 7740 3762 7742

FLASH FLOOD...OBSERVED

$$

EI

666 
WGUS71 KAKQ 162152
FFSAKQ

Flash Flood Statement
National Weather Service Wakefield VA
552 PM EDT Thu Sep 16 2021

VAC085-087-162202-
/O.CAN.KAKQ.FF.W.0063.000000T0000Z-210916T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Hanover VA-Henrico VA-
552 PM EDT Thu Sep 16 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTH CENTRAL HANOVER AND 
EASTERN HENRICO COUNTIES...

The heavy rain has ended and flood waters will continue to recede 
this evening. Therefore, the Flash Flood Warning has been cancelled. 
Please continue to heed remaining road closures.

LAT...LON 3765 7742 3755 7723 3754 7723 3738 7732
      3738 7736 3739 7736 3739 7737 3738 7738
      3742 7740 3742 7741 3744 7743 3745 7742
      3747 7742 3751 7740 3751 7739 3752 7739
      3753 7739 3755 7740 3762 7742

$$

EI

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 16, 3:30 AM EDT	Small Craft Advisory	AKQ		64 hr
Sep 16, 1:35 PM EDT	Special Weather Statement	AKQ	King William	25 min
Sep 16, 1:52 PM EDT	Areal Flood Advisory	AKQ	King and Queen	113 min
Sep 16, 2:29 PM EDT	Special Weather Statement	AKQ	Caroline	31 min
Sep 16, 2:35 PM EDT	Areal Flood Advisory	AKQ	Chesterfield, Powhatan	115 min
Sep 16, 2:49 PM EDT	Special Weather Statement	AKQ	City of Richmond	26 min
Sep 16, 3:08 PM EDT	Areal Flood Advisory	AKQ	Henrico, City of Richmond	9 min
Sep 16, 3:17 PM EDT	Flash Flood Warning	AKQ	Henrico, City of Richmond	3 hr
Sep 16, 3:26 PM EDT	Areal Flood Advisory	AKQ	Hanover, Henrico	3 hr
Sep 16, 4:07 PM EDT	Areal Flood Advisory	AKQ	Goochland, Henrico	113 min
Sep 16, 4:19 PM EDT	Beach Hazards Statement	AKQ	Accomack, Northampton, City of Virginia Beach	51 hr
Sep 16, 4:45 PM EDT	Special Weather Statement	AKQ	Mecklenburg	30 min
Sep 16, 4:58 PM EDT	Areal Flood Advisory	AKQ	Fluvanna, Goochland, Louisa	3 hr
Sep 16, 6:02 PM EDT	Areal Flood Advisory	AKQ	Fluvanna	118 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.