Alert archive / Virginia / Flash Flood Warnings in 2022

Flash Flood Warning 43, NWS Baltimore/Washington

August 4, 2022Greene County, Madison County, Virginia

NWS Baltimore/Washington issued this flash flood warning at Aug 4, 2022, 1:52 PM EDT for Greene County, Madison County, Virginia. It was in force for 109 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 4, 2022, 1:52 PM EDT (17:52 UTC)
Expired
Aug 4, 2022, 3:41 PM EDT
In force
109 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
None

Counties Greene County, VA, Madison County, VA

The radar

The Sterling radar (KLWX), 103 km from the middle of the area, began a volume at 17:55 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.9 hours before the alert went out and 107 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 12:00Z on 2022-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 729 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2022-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 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
729 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
1307 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
28 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Baltimore/Washington wrote its last area forecast discussion before this flash flood warning went out at Aug 4, 10:19 AM EDT, 3 hours 33 minutes earlier.

Area forecast discussion, Aug 4, 10:19 AM EDT, 3 hours 33 minutes before
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Hazardous weather outlook, Aug 4, 5:00 AM EDT, 8 hours 52 minutes before
Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
500 AM EDT Thu Aug 4 2022

ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508-
VAZ052>057-050900-
Chesapeake Bay north of Pooles Island MD-
Chesapeake Bay from Pooles Island to Sandy Point MD-
Chesapeake Bay from Sandy Point to North Beach MD-
Chesapeake Bay from North Beach to Drum Point MD-
Chesapeake Bay from Drum Point MD to Smith Point VA-
Tidal Potomac from Key Bridge to Indian Head MD-
Tidal Potomac from Indian Head to Cobb Island MD-
Tidal Potomac from Cobb Island MD to Smith Point VA-
Patapsco River including Baltimore Harbor-
Chester River to Queenstown MD-Eastern Bay-
Choptank River to Cambridge MD and the Little Choptank River-
Patuxent River to Broomes Island MD-
Tangier Sound and the inland waters surrounding Bloodsworth
Island-District of Columbia-Cecil-Southern Baltimore-
Prince Georges-Anne Arundel-Charles-St. Marys-Calvert-
Central and Southeast Montgomery-Central and Southeast Howard-
Southeast Harford-Prince William/Manassas/Manassas Park-Fairfax-
Arlington/Falls Church/Alexandria-Stafford-Spotsylvania-
King George-
500 AM EDT Thu Aug 4 2022

This Hazardous Weather Outlook is for the Maryland portion of the
Chesapeake Bay, Tidal Potomac River, and I-95 corridor through
central Maryland, northern Virginia, and District of Columbia.

.DAY ONE...Today and Tonight

A Heat Advisory is in effect from 11 AM to 8 PM EDT for most of
the outlook area. Elsewhere, heat index values may approach 105
degrees for a few hours this afternoon.

Scattered showers and thunderstorms may produce heavy rainfall
and isolated instances of flooding or wind damage this afternoon
and evening.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

There is a threat of scattered instances of flooding Friday
afternoon and night. In addition, thunderstorms may produce
localized damaging wind gusts or large hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible at times into the weekend.

MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508-
WVZ050>053-055-050900-
Washington-Frederick MD-Carroll-Northern Baltimore-
Northwest Montgomery-Northwest Howard-Northwest Harford-Augusta-
Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke-Nelson-
Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper-
Northern Fauquier-Southern Fauquier-Western Loudoun-
Eastern Loudoun-Northern Virginia Blue Ridge-
Central Virginia Blue Ridge-Hampshire-Morgan-Berkeley-Jefferson-
Hardy-
500 AM EDT Thu Aug 4 2022

This Hazardous Weather Outlook is for portions of eastern West
Virginia, northern and central Virginia, and central and western
Maryland.

.DAY ONE...Today and Tonight

A Heat Advisory is in effect from 11 AM until 8 PM for portions
of central Maryland. Elsewhere, heat index values around 100 to
105 degrees are possible for a few hours this afternoon.

Scattered to numerous showers and thunderstorms may produce heavy
rainfall and isolated instances of flooding or wind damage this
afternoon and evening.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

There is a threat of scattered instances of flooding Friday
afternoon and night. In addition, thunderstorms may produce
localized damaging wind gusts or large hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible at times into the weekend.

MDZ001-501-502-VAZ503-504-WVZ501>506-050900-
Garrett-Extreme Western Allegany-Central and Eastern Allegany-
Western Highland-Eastern Highland-Western Grant-Eastern Grant-
Western Mineral-Eastern Mineral-Western Pendleton-
Eastern Pendleton-
500 AM EDT Thu Aug 4 2022

This Hazardous Weather Outlook is for the Allegheny Front
counties in western Maryland, eastern West Virginia, and Highland
County Virginia.

.DAY ONE...Today and Tonight

Scattered to numerous showers and thunderstorms may produce heavy
rainfall and instances of flooding or wind damage this afternoon.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

There is a threat of scattered instances of flooding Friday
afternoon and night. In addition, thunderstorms may produce
localized damaging wind gusts or large hail.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible at times into the weekend.

DHOF

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 3, 10:05 PM EDTSmall Craft AdvisoryLWX26 hr
Aug 4, 1:56 PM EDTSevere Thunderstorm WarningLWXGreene, Madison26 min
Aug 4, 3:30 PM EDTFlash Flood WarningLWXRockingham87 min
Aug 4, 3:41 PM EDTAreal Flood WarningLWXGreene, Madison73 min
Aug 4, 4:02 PM EDTSevere Thunderstorm WarningLWXClarke, Frederick, Shenandoah, Warren, City of Winchester29 min
Aug 4, 4:57 PM EDTAreal Flood WarningLWXRockingham93 min
Aug 4, 5:29 PM EDTSpecial Marine WarningLWX91 min
Aug 4, 5:30 PM EDTSpecial Marine WarningLWX90 min
Aug 4, 5:31 PM EDTSpecial Marine WarningLWX39 min
Aug 4, 6:07 PM EDTSpecial Marine WarningLWX21 min
Aug 4, 6:16 PM EDTSpecial Marine WarningLWX36 min
Aug 4, 6:21 PM EDTSevere Thunderstorm WarningLWXCulpeper, Orange39 min
Aug 4, 6:28 PM EDTSevere Thunderstorm WarningLWXArlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church47 min
Aug 4, 6:51 PM EDTSpecial Marine WarningLWX39 min
Aug 4, 6:52 PM EDTSpecial Marine WarningLWX98 min
Aug 4, 7:07 PM EDTSpecial Marine WarningLWX83 min
Aug 4, 7:24 PM EDTSpecial Marine WarningLWX96 min
Aug 4, 7:24 PM EDTSevere Thunderstorm WarningLWXFairfax, Prince William36 min
Aug 4, 7:41 PM EDTSpecial Marine WarningLWX94 min
Aug 4, 7:43 PM EDTSpecial Marine WarningLWX92 min
Aug 4, 2:35 PM EDTSevere Thunderstorm WarningLWXAllegany28 min
Aug 4, 3:00 PM EDTSevere Thunderstorm WarningLWXWashington45 min
Aug 4, 3:23 PM EDTSevere Thunderstorm WarningLWXWashington52 min
Aug 4, 4:07 PM EDTSevere Thunderstorm WarningLWXWashington25 min
Aug 4, 5:08 PM EDTFlash Flood Warning Considerable damage threatLWXAllegany, Garrett3 hr
Aug 4, 5:19 PM EDTSevere Thunderstorm WarningLWXBaltimore, Carroll, Frederick, Howard, Montgomery41 min
Aug 4, 5:24 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Carroll, Howard, Montgomery, Prince George's51 min
Aug 4, 5:42 PM EDTSevere Thunderstorm WarningLWXBaltimore, City of Baltimore48 min
Aug 4, 5:50 PM EDTFlash Flood Warning Considerable damage threatLWXBaltimore, City of Baltimore3 hr
Aug 4, 5:58 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Baltimore, Howard, Prince George's, City of Baltimore47 min
Aug 4, 6:04 PM EDTFlash Flood Warning Considerable damage threatLWXBaltimore, City of Baltimore2 hr
Aug 4, 6:09 PM EDTSevere Thunderstorm WarningLWXCalvert, Saint Mary's26 min
Aug 4, 6:19 PM EDTSevere Thunderstorm WarningLWXBaltimore, Harford41 min
Aug 4, 6:25 PM EDTTornado WarningLWXBaltimore, Harford20 min
Aug 4, 6:53 PM EDTSevere Thunderstorm WarningLWXCecil, Harford52 min
Aug 4, 7:13 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Prince George's47 min
Aug 4, 7:15 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Calvert, Charles, Prince George's45 min
Aug 4, 7:48 PM EDTAreal Flood WarningLWXAllegany, Garrett2 hr
Aug 4, 1:06 PM EDTSevere Thunderstorm WarningLWXGrant, Hampshire, Hardy, Mineral15 min
Aug 4, 4:24 PM EDTSevere Thunderstorm WarningLWXBerkeley, Jefferson35 min

Nearby

Flash Flood Warnings in Virginia, 2022Every flash flood warning in 2022

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.