Flash Flood Warnings in Maryland, 2022

By month

25 of 42 flash flood warnings covering Maryland in 2022 had a flash flood report inside them; 58 of 65 flash flood reports fell inside a warning, on average 94 minutes after it went out.

Maryland, 2022

Each office's whole area, 2022

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

• Prince George's County12
• Montgomery County11
• Baltimore County11
• City of Baltimore7
• Anne Arundel County5
• Washington County4
• Howard County3
• Harford County3
• Frederick County2
• Saint Mary's County2
• Allegany County2
• Cecil County1
• Wicomico County1
• Garrett County1
• Caroline County1
• Queen Anne's County1
• Talbot County1

1. August 10, 20226flash flood warnings
2. July 3, 20225flash flood warnings
3. July 9, 20225flash flood warnings
4. August 5, 20224flash flood warnings
5. July 16, 20223flash flood warnings
6. August 4, 20223flash flood warnings
7. August 22, 20223flash flood warnings
8. June 8, 20222flash flood warnings
9. June 9, 20222flash flood warnings
10. July 2, 20222flash flood warnings
11. September 7, 20222flash flood warnings
12. June 2, 20221flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20212023

National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.