Alert archive / Maryland / Flash Flood Warnings in 2018
Flash Flood Warning 66, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood warning at Aug 2, 2018, 10:32 PM EDT for Allegany County, Maryland. It was in force for 3 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 2, 2018, 10:32 PM EDT (02:32 UTC)
- Expired
- Aug 3, 2018, 1:30 AM EDT
- In force
- 3 hr
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Flood severity
- None
County Allegany County, MD
The radar
The Sterling radar (KLWX), 127 km from the middle of the area, began a volume at 02:31 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
Pittsburgh, PA (KAGC), launched 00:00Z, 2.5 hours before the alert went out and 148 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
- 7 J/kg
- Mixed-layer CIN
- -74 J/kg
- Mixed-layer LCL
- 1223 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 62 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 2, 9:38 PM EDT, 54 minutes earlier.
Area forecast discussion, Aug 2, 9:38 PM EDT, 54 minutes before
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</html>Hazardous weather outlook, Aug 2, 5:11 AM EDT, 17 hours 21 minutes before
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 511 AM EDT Thu Aug 2 2018 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-030915- 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- 511 AM EDT Thu Aug 2 2018 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...Today and Tonight and Tonight A Flash Flood Watch is in effect for the I-95 corridor north of Fredericksburg. Isolated instances of flooding are also possible outside the watch area near Fredericksburg to southern Maryland. Thunderstorms may produce locally damaging wind gusts. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Showers and thunderstorms may result in locally damaging wind gusts and flooding again on Friday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-030915- 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- 511 AM EDT Thu Aug 2 2018 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...Today and Tonight and Tonight A Flash Flood Watch is in effect today and tonight. Thunderstorms may produce locally damaging wind gusts. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Showers and thunderstorms may result in locally damaging wind gusts and flooding again on Friday. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed this afternoon and evening.
In the hours before
Local storm report, Aug 2, 9:38 PM EDT, 54 minutes before
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</html>Local storm report, Aug 2, 9:40 PM EDT, 52 minutes before
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</html>Local storm report, Aug 2, 9:42 PM EDT, 50 minutes before
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</html>Local storm report, Aug 2, 9:45 PM EDT, 47 minutes before
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</html>Local storm report, Aug 2, 10:03 PM EDT, 29 minutes before
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</html>Local storm report, Aug 2, 10:04 PM EDT, 28 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 2, 10:28 PM EDT | Areal Flood Warning | LWX | Prince William | 7 hr |
| Aug 3, 1:10 AM EDT | Small Craft Advisory | LWX | 32 hr | |
| Aug 3, 5:35 PM EDT | Areal Flood Warning | LWX | Albemarle, Greene, Madison, Nelson | 11 hr |
| Aug 3, 6:13 PM EDT | Flash Flood Warning | LWX | Albemarle, Greene | 2 hr |
| Aug 3, 6:56 PM EDT | Areal Flood Warning | LWX | Culpeper, Greene, Madison, Orange, Rappahannock | 16 hr |
| Aug 3, 7:23 PM EDT | Flash Flood Warning | LWX | Madison | 4 hr |
| Aug 3, 7:55 PM EDT | Flash Flood Warning | LWX | Culpeper, Rappahannock | 3 hr |
| Aug 2, 10:05 PM EDT | Areal Flood Warning | LWX | Allegany | 6 hr |
| Aug 2, 11:44 PM EDT | Areal Flood Warning | LWX | Prince George's | 6 hr |
| Aug 3, 12:12 AM EDT | River Flood Warning | LWX | Allegany | 3 hr |
| Aug 3, 12:25 AM EDT | River Flood Warning | LWX | Allegany | 3 hr |
| Aug 3, 7:28 PM EDT | Areal Flood Warning | LWX | Carroll, Howard, Montgomery | 3 hr |
Nearby
Flash Flood Warnings in Maryland, 2018Every flash flood warning in 2018
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.