Alert archive / Virginia / Flash Flood Warnings in 2021
Flash Flood Warning 7, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Jun 10, 2021, 5:05 PM EDT for 5 counties in Virginia. It was in force for 114 min. 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
- Jun 10, 2021, 5:05 PM EDT (21:05 UTC)
- Expired
- Jun 10, 2021, 6:59 PM EDT
- In force
- 114 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, Fairfax County, VA, Loudoun County, VA
The radar
The Sterling radar (KLWX), 15 km from the middle of the area, began a volume at 21:05 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 |
|---|---|---|---|
| Jun 10, 5:13 PM EDT | FLOOD | 1 Wnw Merrifield, VA | EXIT RAMP FROM I-66 AT EXIT 62/VA-243 NUTLEY STREET CLOSED DUE TO HIGH WATER. |
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, 9.1 hours before the alert went out and 7 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.
- Mixed-layer CAPE
- 163 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 987 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
132
WGUS51 KLWX 102105
FFWLWX
VAC059-107-510-600-610-110015-
/O.NEW.KLWX.FF.W.0007.210610T2105Z-210611T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Baltimore MD/Washington DC
505 PM EDT Thu Jun 10 2021
The National Weather Service in Sterling Virginia has issued a
* Flash Flood Warning for...
Central Fairfax County in northern Virginia...
Southeastern Loudoun County in northern Virginia...
The Western City of Alexandria in northern Virginia...
The City of Fairfax in northern Virginia...
The City of Falls Church in northern Virginia...
* Until 815 PM EDT.
* At 505 PM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Doppler radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that may experience flash flooding include...
Arlington... Alexandria...
Reston... Leesburg...
Annandale... Springfield...
Herndon... Fairfax...
Vienna... Groveton...
Falls Church... Broadlands...
Lansdowne... Lowes Island...
Brambleton... Mantua...
Fort Belvoir... Pimmit Hills...
Dulles International Airport... Ashburn...
Additional rainfall amounts of 1 to 2 inches are possible in the
warned area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.
&&
LAT...LON 3893 7749 3904 7757 3911 7749 3907 7746
3906 7733 3900 7734 3892 7720 3883 7708
3875 7710 3870 7721 3876 7729 3884 7729
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
BKF1 follow-up statement
751
WGUS71 KLWX 102259
FFSLWX
Flash Flood Statement
National Weather Service Baltimore MD/Washington DC
659 PM EDT Thu Jun 10 2021
VAC059-107-510-600-610-102309-
/O.CAN.KLWX.FF.W.0007.000000T0000Z-210611T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fairfax VA-Loudoun VA-City of Alexandria VA-City of Fairfax VA-City
of Falls Church VA-
659 PM EDT Thu Jun 10 2021
...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL FAIRFAX AND
SOUTHEASTERN LOUDOUN COUNTIES AND THE WESTERN CITY OF ALEXANDRIA,
THE CITY OF FAIRFAX AND THE CITY OF FALLS CHURCH...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 1200 AM EDT for portions
of DC...Maryland...Virginia and West Virginia.
LAT...LON 3893 7749 3904 7757 3911 7749 3907 7746
3906 7733 3900 7734 3892 7720 3883 7708
3875 7710 3870 7721 3876 7729 3884 7729
$$
BKFThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 10, 2:53 AM EDT | Flash Flood Watch | LWX | Albemarle, Amherst, Arlington, Augusta, Clarke, Culpeper and 27 more | 43 hr |
| Jun 10, 3:14 PM EDT | Special Marine Warning | LWX | 49 min | |
| Jun 10, 5:38 PM EDT | Areal Flood Warning | LWX | King George | 4 hr |
| Jun 10, 5:56 PM EDT | Flash Flood Warning | LWX | Frederick | 2 hr |
| Jun 10, 6:54 PM EDT | Flash Flood Warning | LWX | Frederick | 3 hr |
| Jun 10, 7:18 PM EDT | Severe Thunderstorm Warning | LWX | Culpeper, Orange | 42 min |
| Jun 10, 7:33 PM EDT | Flash Flood Warning | LWX | Culpeper, Fauquier, Rappahannock | 9 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.