Alert archive / Virginia / Flash Flood Warnings in 2026

Flash Flood Warning 29, NWS Baltimore/Washington

August 2, 20266 counties in Virginia; Montgomery County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Aug 2, 2026, 4:34 PM EDT for 6 counties in Virginia; Montgomery 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, 2026, 4:34 PM EDT (20:34 UTC)
Expired
Aug 2, 2026, 7:32 PM EDT
In force
3 hr
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon
Flood severity
None

Counties Montgomery County, MD, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, Fairfax County, VA, Prince William County, VA

The radar

The Sterling radar (KLWX), 26 km from the middle of the area, began a volume at 20:37 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, 8.6 hours before the alert went out and 18 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 2026-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 445 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 2026-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 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
445 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
633 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 2:43 AM EDTFlood WatchLWXAlbemarle, Amherst, Arlington, Augusta, Fairfax, Greene and 19 more21 hr
Aug 2, 2:17 PM EDTSpecial Marine WarningLWX42 min
Aug 2, 2:22 PM EDTSpecial Marine WarningLWX53 min
Aug 2, 2:48 PM EDTSpecial Marine WarningLWX87 min
Aug 2, 2:57 PM EDTSpecial Marine WarningLWX80 min
Aug 2, 3:17 PM EDTSpecial Marine WarningLWX118 min
Aug 2, 5:07 PM EDTSpecial Marine WarningLWX74 min
Aug 2, 5:57 PM EDTSpecial Marine WarningLWX108 min
Aug 2, 6:00 PM EDTSpecial Marine WarningLWX45 min
Aug 2, 2:16 AM EDTCoastal Flood AdvisoryLWXAnne Arundel8 hr
Aug 2, 6:12 PM EDTCoastal Flood AdvisoryLWXAnne Arundel16 hr

Nearby

Flash Flood Warnings in Virginia, 2026Flash Flood Warnings in Maryland, 2026Every flash flood warning in 2026

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.