Flash Flood Warnings in Maryland, 2024

By month

23 of 45 flash flood warnings covering Maryland in 2024 had a flash flood report inside them; 35 of 37 flash flood reports fell inside a warning, on average 59 minutes after it went out.

Maryland, 2024

Each office's whole area, 2024

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.

• Baltimore County16
• City of Baltimore9
• Howard County8
• Montgomery County7
• Anne Arundel County6
• Dorchester County5
• Wicomico County5
• Washington County5
• Worcester County4
• Allegany County4
• Frederick County3
• Carroll County3
• Prince George's County3
• Harford County2
• Somerset County2
• Caroline County2
• Garrett County1
• Cecil County1
• Queen Anne's County1
• Talbot County1

1. August 9, 20249flash flood warnings
2. July 12, 20244flash flood warnings
3. August 7, 20244flash flood warnings
4. August 19, 20243flash flood warnings
5. June 6, 20242flash flood warnings
6. July 18, 20242flash flood warnings
7. July 23, 20242flash flood warnings
8. September 26, 20242flash flood warnings
9. January 10, 20241flash flood warnings
10. May 10, 20241flash flood warnings
11. May 24, 20241flash flood warnings
12. May 27, 20241flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20232025

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.