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Flash Flood Warning issued August 7 at 6:23PM EDT until August 7 at 9:30PM EDT by NWS Baltimore MD/Washington DC

8.0

39.0671° N, 77.2447° W·US-MD

Started 2h ago

Event Details

Typeflood

Severity8.0

Statusactive

Location39.0671°N, 77.2447°W (US-MD)

Started2026-08-07T22:23:00+00:00

Last Updated2026-08-07T23:10:03.37+00:00

Sourcenoaa_ahps

Source URLapi.weather.gov

Confidence1.00

Impact Zones

Catastrophic Impact Zone

Flash flooding or major flood stage. Immediate danger to life and property.

NWS polygon

Zone estimates are based on scientific models and may differ from actual local conditions.

Impact Analysis

Note: Zone 1 uses NWS polygon geometry. Exposure for this zone is pending polygon-based computation — totals reflect outer zones only.

Population from ACS 5-Year 2022 tract sampling; structure counts from Microsoft Building Footprints or Census ACS housing data, capped by USGS NLCD 2021 developed land. Estimates for situational awareness — not for actuarial, regulatory, or underwriting use.

Historical Comparison

2021 MONTGOMERY County, MARYLAND Flash Flood (2021)76% match

Flash Flood in MARYLAND, 11km from current event, $1M in recorded damage

MONTGOMERY County, MARYLANDDamage: $1.0MFatalities: 1

2018 FREDERICK County, MARYLAND Flash Flood (2018)71% match

Flash Flood in MARYLAND, 43km from current event, $43M in recorded damage

FREDERICK County, MARYLANDDamage: $43.2M

2019 DISTRICT OF COLUMBIA County, DISTRICT OF COLUMBIA Flash Flood (2019)71% match

Flash Flood in DISTRICT OF COLUMBIA, 21km from current event, $500K in recorded damage

DISTRICT OF COLUMBIA County, DISTRICT OF COLUMBIADamage: $500K

Historical comparison based on peril type, geography, and severity. Past events do not predict future outcomes.

View on Live Map

US-MD flood hazard profile All US hazard profiles Scoring methodology

Zone estimates are based on scientific models and may differ from actual local conditions.