Heat Advisories in Maryland
298 heat advisories 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 heat advisories reaches back to 2005.
Heat Advisories by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Heat Advisories
- 298
- Busiest year
- 202432 heat advisories
- Average year
- 14over 22 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.
- Baltimore County122
- City of Baltimore120
- Calvert County115
- Charles County114
- Saint Mary's County113
- Anne Arundel County111
- Prince George's County109
- Cecil County82
- Frederick County79
- Carroll County78
- Caroline County70
- Talbot County70
- Queen Anne's County69
- Dorchester County67
- Wicomico County67
- Worcester County67
- Kent County66
- Somerset County65
- Washington County64
- Harford County64
- Howard County63
- Montgomery County63
- Allegany County46
- Garrett County2
The latest heat advisories
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 2, 4:08 PM EDT | Heat Advisory | LWX | Calvert, Charles, Saint Mary's | 27 hr |
| Sep 2, 3:53 AM EDT | Heat Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 40 hr |
| Sep 1, 1:38 PM EDT | Heat Advisory | AKQ | Dorchester, Somerset, Wicomico, Worcester | 54 hr |
| Jul 18, 2:31 AM EDT | Heat Advisory | AKQ | Dorchester, Somerset, Wicomico, Worcester | 17 hr |
| Jul 18, 2:16 AM EDT | Heat Advisory | LWX | Anne Arundel, Baltimore, Calvert, Charles, Prince George's, Saint Mary's and 1 more | 16 hr |
| Jul 18, 2:12 AM EDT | Heat Advisory | PHI | Caroline, Queen Anne's, Talbot | 17 hr |
| Jul 16, 9:55 AM EDT | Heat Advisory | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 10 hr |
| Jul 16, 12:10 AM EDT | Heat Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 20 hr |
| Jul 14, 1:29 PM EDT | Heat Advisory | AKQ | Dorchester, Somerset, Wicomico, Worcester | 31 hr |
| Jul 14, 12:04 PM EDT | Heat Advisory | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 32 hr |
| Jul 13, 2:45 PM EDT | Heat Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 53 hr |
| Jul 5, 1:57 AM EDT | Heat Advisory | LWX | Anne Arundel, Baltimore, Calvert, Cecil, Charles, Harford and 5 more | 18 hr |
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.