Alert archive / Maryland / Heat Advisories
Heat Advisories in Maryland, 2021
11 heat advisories in 2021. 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 in 2021. Tap one for its archive.
- Heat Advisories
- 11
- Busiest month
- August5 heat advisories
- Busiest day
- August 10, 20212 heat advisories
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 3:13 PM EDT | Heat Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 53 hr |
| Jun 30, 3:23 AM EDT | Heat Advisory | LWX | Anne Arundel, Baltimore, Calvert, Cecil, Harford, City of Baltimore | 16 hr |
| Jul 6, 3:01 AM EDT | Heat Advisory | LWX | Baltimore, Carroll, Cecil, Frederick, Harford, Washington and 1 more | 17 hr |
| Jul 11, 6:18 PM EDT | Heat Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 50 hr |
| Jul 15, 2:33 PM EDT | Heat Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 52 hr |
| Jul 16, 2:57 PM EDT | Heat Advisory | LWX | Anne Arundel, Baltimore, Calvert, Cecil, Charles, Harford and 4 more | 28 hr |
| Aug 10, 3:33 AM EDT | Heat Advisory | PHI | Caroline, Kent, Queen Anne's, Talbot | 4 days |
| Aug 10, 1:33 PM EDT | Heat Advisory | LWX | Anne Arundel, Baltimore, Calvert, Carroll, Cecil, Charles and 8 more | 29 hr |
| Aug 11, 3:55 AM EDT | Heat Advisory | AKQ | Dorchester, Somerset, Wicomico, Worcester | 63 hr |
| Aug 12, 2:15 AM EDT | Heat Advisory | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 18 hr |
| Aug 12, 6:04 PM EDT | Heat Advisory | LWX | Allegany, Anne Arundel, Baltimore, Calvert, Carroll, Cecil and 9 more | 25 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Baltimore County6
- Cecil County6
- Harford County6
- City of Baltimore6
- Anne Arundel County5
- Calvert County5
- Caroline County4
- Kent County4
- Queen Anne's County4
- Talbot County4
- Carroll County4
- Frederick County4
- Washington County4
- Charles County4
- Howard County4
- Prince George's County4
- Saint Mary's County4
- Montgomery County3
- Allegany County2
- Dorchester County1
- Somerset County1
- Wicomico County1
- Worcester County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20202022
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.