Alert archive / Maryland / Flash Flood Warnings in 2025

Flash Flood Warning 7, NWS Baltimore/Washington

May 13, 2025Allegany County, Maryland

NWS Baltimore/Washington issued this flash flood warning at May 13, 2025, 2:49 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
May 13, 2025, 2:49 PM EDT (18:49 UTC)
Expired
May 13, 2025, 5:23 PM EDT
In force
3 hr
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Emergency
Flash flood emergency
Damage threat
Catastrophic
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 18:52 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 (KPIT), launched 12:00Z, 6.8 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.

Skew-T log-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2025-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 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, Pittsburgh, PA at 12:00Z on 2025-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 square meters per square second.193958Sfc1 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
36 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
558 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
193 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 May 13, 10:13 AM EDT, 4 hours 36 minutes earlier.

Area forecast discussion, May 13, 10:13 AM EDT, 4 hours 36 minutes before
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Hazardous weather outlook, May 13, 1:38 PM EDT, 1 hour 11 minutes before
Hazardous Weather Outlook
National Weather Service Baltimore MD/Washington DC
138 PM EDT Tue May 13 2025

ANZ530>543-DCZ001-MDZ008-011-013-014-016>018-504-506-508-
VAZ053>057-527-141745-
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-Fairfax-Arlington/Falls Church/Alexandria-
Stafford-Spotsylvania-King George-
Central and Southeast Prince William/Manassas/Manassas Park-
138 PM EDT Tue May 13 2025

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...This Afternoon and Tonight

A Flood Watch is in effect for northern Virginia, Washington DC,
and Montgomery County Maryland through tonight. An isolated
instance of flooding is possible elsewhere.

A Gale Warning is in effect for most of the area waterways for
this evening.

Special Marine Warnings may be needed for gusty thunderstorms this
afternoon and evening, mainly on the middle Chesapeake Bay and
lower tidal Potomac River.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

An isolated instance of flooding is possible Wednesday.

Severe thunderstorms capable of producing damaging winds and hail
are possible Friday, but confidence is low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to report flooding and rainfall
measurements to the National Weather Service.

MDZ003>006-503-505-507-VAZ025>031-036>040-050-051-501-502-505>508-
526-WVZ050>053-055-141745-
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-Northwest Prince William-Hampshire-
Morgan-Berkeley-Jefferson-Hardy-
138 PM EDT Tue May 13 2025

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

.DAY ONE...This Afternoon and Tonight

A Flood Watch is in effect through tonight for most of the outlook
area excluding the greater Baltimore metropolitan area. However,
and isolated instance of flooding could occur outside the watch
area.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

An isolated instance of flooding is possible Wednesday.

River Flood Watches are in effect for portions of the Potomac,
Shenandoah, and Rappahannock Rivers from Wednesday morning through
early Friday.

Severe thunderstorms capable of producing damaging winds and hail
are possible Friday, but confidence is low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to report flooding and rainfall
measurements to the National Weather Service.

MDZ501-502-509-510-VAZ503-504-WVZ501>506-141745-
Extreme Western Allegany-Central and Eastern Allegany-
Western Garrett-Eastern Garrett-Western Highland-Eastern Highland-
Western Grant-Eastern Grant-Western Mineral-Eastern Mineral-
Western Pendleton-Eastern Pendleton-
138 PM EDT Tue May 13 2025

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

.DAY ONE...This Afternoon and Tonight

A Flood Watch is in effect for most of the outlook area through
tonight.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

An isolated instance of flooding is possible Wednesday.

Severe thunderstorms capable of producing damaging winds and hail
are possible Friday, but confidence is low at this time.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to report flooding and rainfall
measurements to the National Weather Service.

DHOF

In the hours before

Local storm report, May 13, 12:47 PM EDT, 2 hours 2 minutes before
Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
1247 PM EDT Tue May 13 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1025 AM     Flood            Stratmeade Springs      38.85N  77.24W
05/13/2025                   Fairfax            VA   Mesonet

            The stream gauge on Accotink Creek at Strathmeade
            Springs exceeded minor flood stage.

&&

Event Number LWX2504694

CJL
Local storm report, May 13, 12:51 PM EDT, 1 hour 58 minutes before
Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
1251 PM EDT Tue May 13 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1145 AM     Flood            Westernport             39.49N  79.04W
05/13/2025                   Allegany           MD   Mesonet

            The stream gauge on Georges Creek near Westernport
            exceeded minor flood stage.

&&

Event Number LWX2504695

CJL
Local storm report, May 13, 1:08 PM EDT, 1 hour 41 minutes before
Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
108 PM EDT Tue May 13 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0104 PM     Flash Flood      2 SSW Keyser            39.42N  79.00W
05/13/2025                   Mineral            WV   Emergency Mngr

            Reports that Stony Run is out of its banks and that
            evacuations are ongoing along Stony Run Rd.

&&

Event Number LWX2504696

CJL
Local storm report, May 13, 1:14 PM EDT, 1 hour 35 minutes before
Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
114 PM EDT Tue May 13 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0104 PM     Flash Flood      2 NNE New Creek         39.40N  79.01W
05/13/2025                   Mineral            WV   Emergency Mngr

            Multiple reports of flooding along New Creek Hwy (220).

&&

Event Number LWX2504697

CJL
Local storm report, May 13, 1:35 PM EDT, 1 hour 14 minutes before
Preliminary Local Storm Report
National Weather Service Baltimore MD/Washington DC
135 PM EDT Tue May 13 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0126 PM     Flash Flood      Lonaconing              39.57N  78.98W
05/13/2025                   Allegany           MD   Emergency Mngr

            Multiple reports of roads closed in and around
            Lonaconing, especially south along Georges Creek as well
            as any of its feeder streams.

0128 PM     Flash Flood      1 NNE Barton            39.55N  79.01W
05/13/2025                   Allegany           MD   Emergency Mngr

            Reports that Laurel Run Rd. is washed out in some
            locations. Evacuations are ongoing from flooding along
            Laurel Run.

0131 PM     Flash Flood      Westernport             39.49N  79.04W
05/13/2025                   Allegany           MD   Emergency Mngr

            Water is starting to reach residences/businesses along
            Georges Creek in Westernport. This is coincident with a
            6 foot rise on the nearby stream gauge in the past 3
            hours.

&&

Event Number LWX2504698
Event Number LWX2504699
Event Number LWX2504700

CJL
Special weather statement, May 13, 2:16 PM EDT, 33 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 8:48 AM EDTAreal Flood WarningLWXFairfax, Prince William, City of Fairfax, City of Manassas, City of Manassas Park4 hr
May 13, 11:37 AM EDTRiver Flood WatchLWXCulpeper, Fauquier32 hr
May 13, 11:37 AM EDTRiver Flood WatchLWXLoudoun21 days
May 13, 11:37 AM EDTRiver Flood WatchLWXClarke, Warren62 hr
May 13, 1:02 PM EDTGale WarningLWX13 hr
May 13, 1:02 PM EDTSmall Craft AdvisoryLWX20 hr
May 13, 1:37 PM EDTAreal Flood WarningLWXRockingham11 hr
May 13, 3:46 PM EDTAreal Flood WarningLWXFairfax6 hr
May 13, 4:09 PM EDTRiver Flood WatchLWXLoudoun21 days
May 13, 4:09 PM EDTRiver Flood WatchLWXFairfax, City of Fairfax18 hr
May 13, 4:26 PM EDTAreal Flood WarningLWXAlbemarle, Augusta, Nelson, City of Waynesboro15 hr
May 13, 4:44 PM EDTFlash Flood Warning Considerable damage threatLWXAlbemarle, Augusta, Nelson3 hr
May 13, 4:48 PM EDTAreal Flood WarningLWXGreene, Madison, Page, Rockingham26 hr
May 13, 5:24 PM EDTFlash Flood WarningLWXAlbemarle3 hr
May 13, 5:34 PM EDTAreal Flood WarningLWXClarke, Frederick, Page, Rockingham, Shenandoah, Warren and 2 more18 hr
May 13, 5:56 PM EDTAreal Flood WarningLWXCulpeper, Fauquier, Loudoun, Page, Prince William, Rappahannock and 1 more16 hr
May 13, 6:25 PM EDTFlash Flood WarningLWXAlbemarle, Greene, Madison, Orange, City of Charlottesville6 hr
May 13, 6:48 PM EDTFlash Flood WarningLWXNelson2 hr
May 13, 7:25 PM EDTAreal Flood WarningLWXAlbemarle, Augusta, Nelson7 hr
May 13, 7:31 PM EDTAreal Flood WarningLWXFairfax4 hr
May 13, 11:37 AM EDTRiver Flood WatchLWXWashington10 hr
May 13, 12:23 PM EDTAreal Flood WarningLWXAllegany, Garrett37 min
May 13, 12:41 PM EDTAreal Flood WarningLWXAllegany, Garrett16 min
May 13, 12:57 PM EDTFlash Flood WarningLWXAllegany, Garrett5 hr
May 13, 1:00 PM EDTFlash Flood Warning Considerable damage threatLWXAllegany, Garrett5 hr
May 13, 1:52 PM EDTFlash Flood WarningLWXGarrett4 hr
May 13, 2:20 PM EDTRiver Flood WarningLWXAllegany19 hr
May 13, 3:59 PM EDTRiver Flood WarningLWXAllegany24 hr
May 13, 4:00 PM EDTRiver Flood WarningLWXWashington46 hr
May 13, 4:02 PM EDTRiver Flood WarningLWXAllegany37 hr
May 13, 4:06 PM EDTRiver Flood WatchLWXWashington56 hr
May 13, 4:09 PM EDTRiver Flood WarningLWXAllegany21 days
May 13, 5:23 PM EDTAreal Flood WarningLWXAllegany6 hr
May 13, 5:27 PM EDTAreal Flood WarningLWXGarrett6 hr
May 13, 6:00 PM EDTAreal Flood WarningLWXAllegany, Garrett6 hr
May 13, 6:07 PM EDTAreal Flood WarningLWXAllegany, Garrett32 hr
May 13, 12:35 PM EDTAreal Flood WarningLWXGrant, Hampshire, Hardy, Mineral, Pendleton12 hr
May 13, 4:02 PM EDTRiver Flood WarningLWXBerkeley, Jefferson40 hr
May 13, 4:03 PM EDTRiver Flood WarningLWXMorgan66 hr
May 13, 4:09 PM EDTRiver Flood WatchLWXHampshire, Hardy21 days
May 13, 5:40 PM EDTAreal Flood WarningLWXHampshire, Hardy8 hr

Nearby

Flash Flood Warnings in Maryland, 2025Every flash flood warning in 2025

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.