Alert archive / Maryland / Flash Flood Warnings

Flash Flood Warnings in Maryland, 2021

42 flash flood warnings 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 flash flood warnings reaches back to 1986.

Flash Flood Warnings by county

Each county as a circle sized by its count in 2021. Tap one for its archive.

Flash Flood Warnings
42
Busiest month
August14 flash flood warnings
Busiest day
August 20, 20214 flash flood warnings

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.

IssuedProductOfficeCountiesLasted
Jun 3, 6:29 PM EDTFlash Flood Warning Considerable damage threatLWXBaltimore, Harford3 hr
Jun 8, 3:57 PM EDTFlash Flood Warning Considerable damage threatLWXCecil93 min
Jun 9, 7:35 PM EDTFlash Flood Warning Considerable damage threatLWXSaint Mary's95 min
Jun 10, 3:28 PM EDTFlash Flood WarningAKQWicomico81 min
Jun 10, 3:37 PM EDTFlash Flood Warning Considerable damage threatLWXBaltimore, City of Baltimore2 hr
Jun 10, 4:52 PM EDTFlash Flood Warning Considerable damage threatLWXCharles, Prince George's93 min
Jun 10, 9:10 PM EDTFlash Flood Warning Considerable damage threatLWXAllegany113 min
Jun 11, 10:51 AM EDTFlash Flood WarningLWXCharles4 hr
Jun 14, 10:05 PM EDTFlash Flood Warning Considerable damage threatLWXBaltimore, City of Baltimore2 hr
Jun 14, 10:49 PM EDTFlash Flood Warning Considerable damage threatLWXMontgomery, Prince George's3 hr
Jul 1, 3:31 PM EDTFlash Flood WarningLWXMontgomery3 hr
Jul 1, 8:30 PM EDTFlash Flood Warning Considerable damage threatLWXMontgomery, Prince George's2 hr
Jul 8, 11:13 PM EDTFlash Flood Warning Considerable damage threatLWXSaint Mary's76 min
Jul 9, 12:25 AM EDTFlash Flood WarningAKQDorchester3 hr
Jul 12, 7:55 PM EDTFlash Flood WarningLWXCecil, Harford77 min
Jul 17, 3:34 PM EDTFlash Flood Warning Considerable damage threatLWXBaltimore, City of Baltimore2 hr
Jul 17, 4:45 PM EDTFlash Flood Warning Considerable damage threatLWXBaltimore101 min
Jul 25, 11:50 PM EDTFlash Flood Warning Considerable damage threatLWXCecil3 hr
Aug 9, 4:59 PM EDTFlash Flood WarningPHICaroline, Queen Anne's79 min
Aug 9, 6:39 PM EDTFlash Flood Warning Considerable damage threatLWXMontgomery, Prince George's3 hr
Aug 14, 10:44 PM EDTFlash Flood Warning Considerable damage threatLWXCalvert, Charles, Prince George's3 hr
Aug 15, 12:13 AM EDTFlash Flood Warning Considerable damage threatLWXPrince George's3 hr
Aug 15, 12:42 AM EDTFlash Flood Warning Considerable damage threatLWXMontgomery, Prince George's2 hr
Aug 16, 5:24 PM EDTFlash Flood Warning Considerable damage threatLWXPrince George's2 hr
Aug 16, 8:47 PM EDTFlash Flood Warning Considerable damage threatLWXWashington2 hr
Aug 16, 9:04 PM EDTFlash Flood Warning Considerable damage threatLWXAllegany2 hr
Aug 16, 11:32 PM EDTFlash Flood Warning Considerable damage threatLWXMontgomery3 hr
Aug 18, 11:59 PM EDTFlash Flood Warning Considerable damage threatLWXCecil2 hr
Aug 20, 4:52 AM EDTFlash Flood Warning Considerable damage threatLWXFrederick102 min
Aug 20, 7:55 AM EDTFlash Flood Warning Considerable damage threatLWXMontgomery2 hr
Aug 20, 8:16 AM EDTFlash Flood Warning Considerable damage threatLWXMontgomery111 min
Aug 20, 8:21 AM EDTFlash Flood Warning Considerable damage threatLWXMontgomery, Prince George's101 min
Sep 1, 8:39 AM EDTFlash Flood WarningLWXAllegany, Garrett5 hr
Sep 1, 2:26 PM EDTFlash Flood Warning Considerable damage threatLWXCarroll, Frederick6 hr
Sep 1, 3:25 PM EDTFlash Flood Warning Considerable damage threatLWXCarroll, Frederick5 hr
Sep 1, 3:34 PM EDTFlash Flood Warning Considerable damage threatLWXCecil, Harford3 hr
Sep 8, 11:02 PM EDTFlash Flood Warning Considerable damage threatLWXFrederick78 min
Sep 15, 6:20 PM EDTFlash Flood Warning Considerable damage threatLWXWashington2 hr
Sep 15, 7:22 PM EDTFlash Flood Warning Considerable damage threatLWXFrederick, Washington64 min
Sep 23, 2:34 AM EDTFlash Flood Warning Considerable damage threatLWXFrederick, Washington3 hr
Sep 23, 4:17 AM EDTFlash Flood Warning Considerable damage threatLWXFrederick3 hr
Sep 23, 9:49 AM EDTFlash Flood WarningPHIKent, Queen Anne's, Talbot4 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

  1. August 20, 20214flash flood warnings
  2. September 1, 20214flash flood warnings
  3. June 10, 20213flash flood warnings
  4. August 15, 20213flash flood warnings
  5. August 17, 20213flash flood warnings
  6. September 23, 20213flash flood warnings
  7. June 11, 20212flash flood warnings
  8. June 15, 20212flash flood warnings
  9. July 9, 20212flash flood warnings
  10. July 17, 20212flash flood warnings
  11. August 9, 20212flash flood warnings
  12. September 15, 20212flash flood warnings

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. Rebuilt daily.