Extreme Heat Warnings in Maryland
10 extreme heat warnings since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of extreme heat warnings reaches back to 2005.
Extreme Heat Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Extreme Heat Warnings
- 10
- Busiest year
- 20266 extreme heat warnings
- Average year
- 5over 2 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Washington County6
- Anne Arundel County5
- Baltimore County5
- Calvert County5
- Carroll County5
- Cecil County5
- Charles County5
- Frederick County5
- Harford County5
- Howard County5
- Montgomery County5
- Prince George's County5
- Saint Mary's County5
- City of Baltimore5
- Allegany County3
- Caroline County2
- Dorchester County2
- Kent County2
- Queen Anne's County2
- Somerset County2
- Talbot County2
- Wicomico County2
- Worcester County2
The latest extreme heat warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 1:32 PM EDT | Extreme Heat Warning | LWX | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 8 more | 54 hr |
| Jul 1, 1:58 PM EDT | Extreme Heat Warning | AKQ | Dorchester, Somerset, Wicomico, Worcester | 3 days |
| Jul 1, 1:32 PM EDT | Extreme Heat Warning | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 55 hr |
| Jul 1, 1:32 PM EDT | Extreme Heat Warning | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 30 hr |
| Jul 1, 10:27 AM EDT | Extreme Heat Warning | LWX | Allegany, Washington | 10 hr |
| Jun 30, 2:44 AM EDT | Extreme Heat Warning | PHI | Caroline, Kent, Queen Anne's, Talbot | 5 days |
Nearby
Sources
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.