Alert archive / Virginia / Flash Flood Warnings in 2021

Flash Flood Warning 61, NWS Wakefield, VA

September 9, 20214 counties in Virginia

NWS Wakefield, VA issued this flash flood warning at Sep 9, 2021, 2:45 PM EDT for 4 counties in 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 9, 2021, 2:45 PM EDT (18:45 UTC)
Expired: Sep 9, 2021, 4:55 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, City of Virginia Beach, VA

The radar

The Norfolk radar (KAKQ), 61 km from the middle of the area, began a volume at 18:48 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 9, 3:15 PM EDT	FLASH FLOOD	Downtown Norfolk, VA	HIGH WATER ON THE ROAD IN VARIOUS LOCATIONS ACROSS DOWNTOWN NORFOLK. REPORTS FROM WAZE.

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 143 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: 1453 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 43 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

116 
WGUS51 KAKQ 091845
FFWAKQ
VAC550-710-740-810-092245-
/O.NEW.KAKQ.FF.W.0061.210909T1845Z-210909T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Wakefield VA
245 PM EDT Thu Sep 9 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...
  The Northwestern City of Virginia Beach in southeastern Virginia...

* Until 645 PM EDT.

* At 245 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 0.5 and 1.5 inches of 
  rain have fallen. The expected rainfall rate is 2 to 4 inches in 1 
  hour. Additional rainfall amounts of 1 to 3 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...
  Virginia Beach, Downtown Norfolk, Norfolk State University, 
  Downtown Portsmouth, Old Dominion University, Regent University, 
  Virginia Wesleyan University, Ocean View, Churchland, Kempsville, 
  Deep Creek, Norfolk, Chesapeake, Portsmouth, Suffolk, Ghent, 
  Norview, Cradock, Norfolk NAS and Norfolk International.

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.

&&

LAT...LON 3689 7640 3690 7641 3690 7643 3691 7643
      3690 7640 3693 7639 3693 7634 3697 7634
      3697 7627 3691 7610 3689 7611 3680 7613
      3675 7622 3674 7636 3677 7646 3682 7646

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...2-4 INCHES IN 1 HOUR

$$

Rogers

1 follow-up statement

307 
WGUS71 KAKQ 092055
FFSAKQ

Flash Flood Statement
National Weather Service Wakefield VA
455 PM EDT Thu Sep 9 2021

VAC550-710-740-810-092105-
/O.CAN.KAKQ.FF.W.0061.000000T0000Z-210909T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
City of Chesapeake VA-City of Norfolk VA-City of Portsmouth VA-City
of Virginia Beach VA-
455 PM EDT Thu Sep 9 2021

...FLASH FLOOD WARNING FOR THE NORTHWESTERN CITY OF CHESAPEAKE, THE 
CITY OF NORFOLK, THE CITY OF PORTSMOUTH AND THE NORTHWESTERN CITY OF 
VIRGINIA BEACH HAS BEEN REPLACED WITH A FLOOD WARNING...

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

LAT...LON 3689 7640 3690 7641 3690 7643 3691 7643
      3690 7640 3693 7639 3693 7634 3697 7634
      3697 7627 3691 7610 3689 7611 3680 7613
      3675 7622 3674 7636 3677 7646 3682 7646

$$

Rogers

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 8, 11:05 PM EDT	Special Weather Statement	AKQ	Northumberland	40 min
Sep 9, 3:39 AM EDT	Small Craft Advisory	AKQ		36 hr
Sep 9, 2:31 PM EDT	Areal Flood Advisory	AKQ	City of Chesapeake, City of Norfolk, City of Portsmouth, City of Suffolk, City of Virginia Beach	14 min
Sep 9, 4:54 PM EDT	Areal Flood Warning	AKQ	City of Chesapeake, City of Norfolk, City of Portsmouth, City of Virginia Beach	111 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.