Flash Flood Warnings in Maryland, 2019

By month

19 of 29 flash flood warnings covering Maryland in 2019 had a flash flood report inside them; 45 of 47 flash flood reports fell inside a warning, on average 88 minutes after it went out.

Maryland, 2019

Each office's whole area, 2019

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.

• Garrett County9
• Montgomery County5
• Baltimore County5
• Frederick County3
• City of Baltimore3
• Cecil County2
• Prince George's County2
• Harford County2
• Kent County2
• Anne Arundel County1
• Carroll County1
• Washington County1
• Howard County1
• Charles County1
• Saint Mary's County1
• Allegany County1

1. July 8, 20198flash flood warnings
2. July 11, 20198flash flood warnings
3. June 30, 20193flash flood warnings
4. July 4, 20192flash flood warnings
5. November 1, 20192flash flood warnings
6. June 20, 20191flash flood warnings
7. July 5, 20191flash flood warnings
8. July 6, 20191flash flood warnings
9. July 31, 20191flash flood warnings
10. August 2, 20191flash flood warnings
11. August 6, 20191flash flood warnings

Alerts in force nowTornadoes on recordThe radar archive20182020

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.