Alert archive / Virginia / Flash Flood Warnings in 2020
Flash Flood Warning 52, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Aug 22, 2020, 10:07 PM EDT for Augusta County, City of Staunton, City of Waynesboro, Virginia. It was in force for 4 hr. 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 22, 2020, 10:07 PM EDT (02:07 UTC)
- Expired
- Aug 23, 2020, 2:00 AM EDT
- In force
- 4 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
Counties Augusta County, VA, City of Staunton, VA, City of Waynesboro, VA
The radar
The Sterling radar (KLWX), 164 km from the middle of the area, began a volume at 02:09 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
Roanoke, VA (KRNK), launched 00:00Z, 2.1 hours before the alert went out and 111 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
- 181 J/kg
- Mixed-layer CIN
- -58 J/kg
- Mixed-layer LCL
- 1183 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 97 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 22, 9:28 PM EDT, 39 minutes earlier.
Area forecast discussion, Aug 22, 9:28 PM EDT, 39 minutes before
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</html>Hazardous weather outlook, Aug 22, 1:30 PM EDT, 8 hours 37 minutes before
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 130 PM EDT Sat Aug 22 2020 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-231000- 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-Southern Baltimore-Prince Georges- Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford- Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George- 130 PM EDT Sat Aug 22 2020 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and adjacent counties in central Maryland and northern Virginia as well as the District of Columbia. .DAY ONE...This Afternoon and Tonight Heavy rain from thunderstorms may produce localized flooding late this afternoon and evening. Scattered thunderstorms may produce gusty winds over the waters. .DAYS TWO THROUGH SEVEN...Sunday through Friday Damaging wind gusts from organized severe thunderstorms are possible on Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-231000- Washington-Frederick MD-Carroll-Northern Baltimore- Extreme Western Allegany-Central and Eastern Allegany- Northwest Montgomery-Central and Southeast Montgomery- Northwest Howard-Central and Southeast Howard-Northwest Harford- Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke- Nelson-Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- Northern Fauquier-Southern Fauquier-Western Highland- Eastern Highland-Western Loudoun-Eastern Loudoun- Northern Virginia Blue Ridge-Central Virginia Blue Ridge- Hampshire-Morgan-Berkeley-Jefferson-Hardy-Western Grant- Eastern Grant-Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- 130 PM EDT Sat Aug 22 2020 This Hazardous Weather Outlook is for eastern West Virginia, northern and central Virginia, and central and western Maryland with the exception of Garrett County. .DAY ONE...This Afternoon and Tonight A Flash Flood Watch is in effect for Pendleton County in West Virginia, as well as Highland, Rockingham, and Augusta counties in Virginia until midnight. Elsewhere, localized flooding is possible through this evening, especially near and south of Interstate 66 and US 50. .DAYS TWO THROUGH SEVEN...Sunday through Friday Damaging wind gusts from organized severe thunderstorms are possible on Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Local storm report, Aug 22, 6:56 PM EDT, 3 hours 11 minutes before
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</html>Local storm report, Aug 22, 9:40 PM EDT, 27 minutes before
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</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 8:29 PM EDT | Areal Flood Warning | LWX | Albemarle, Augusta, Nelson, City of Staunton, City of Waynesboro | 6 hr |
| Aug 22, 9:37 PM EDT | Flash Flood Warning | LWX | Augusta, Nelson | 4 hr |
| Aug 23, 4:24 PM EDT | Special Marine Warning | LWX | 2 hr | |
| Aug 23, 5:51 PM EDT | Special Marine Warning | LWX | 114 min | |
| Aug 23, 7:09 PM EDT | Special Marine Warning | LWX | 87 min | |
| Aug 23, 4:23 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, Harford | 52 min |
| Aug 23, 5:01 PM EDT | Severe Thunderstorm Warning | LWX | Frederick | 44 min |
| Aug 23, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | Carroll, Frederick, Howard, Montgomery | 46 min |
| Aug 23, 6:58 PM EDT | Severe Thunderstorm Warning | LWX | Baltimore, City of Baltimore | 47 min |
| Aug 23, 7:34 PM EDT | Areal Flood Warning | LWX | Baltimore, City of Baltimore | 2 hr |
| Aug 23, 7:45 PM EDT | Flash Flood Warning | LWX | Baltimore | 81 min |
| Aug 23, 7:49 PM EDT | Areal Flood Warning | LWX | Pendleton | 116 min |
Nearby
Flash Flood Warnings in Virginia, 2020Every flash flood warning in 2020
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.