Severe Thunderstorm Warning — Frederick County, Maryland
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Current Status
⛈️ Active: Severe Thunderstorm Warning
Severe Thunderstorm Warning issued August 27 at 7:19PM EDT until August 27 at 7:45PM EDT by NWS Baltimore MD/Washington DC
At 719 PM EDT, a severe thunderstorm was located near Green Valley, or near Damascus, moving east at 25 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Radar indicated. IMPACT...Damaging winds will cause some trees and large branches to fall. This could injure those outdoors, as well as damage homes and vehicles. Roadways may become blocked by downed trees. Localized power outages are possible. Unsecured light objects may become projectiles. Locations impacted include... Germantown, Damascus, Montgomery Village, Ballenger Creek, Redland, Mount Airy, New Market, Green Valley, Linganore-Bartonsville, Clarksburg, Adamstown, Buckeystown, Monrovia, Laytonsville, Barnesville, Ijamsville, Park Mills, Watersville, Poplar Springs, and Woodbine.
Effective August 27, 2026 at 7:19 PM ET · Expires August 27, 2026 at 7:45 PM ET
Event Details
Event Type
Severe Thunderstorm Warning
Severity
severe
Issued By
NWS Baltimore MD/Washington DC
Expires
August 27, 2026 at 7:45 PM ET
Last Checked
1 minute ago
What To Do
📋 Official NWS Guidance
For your protection move to an interior room on the lowest floor of a building. Continuous cloud to ground lightning is occurring with this storm. Move indoors immediately. Lightning is one of nature's leading killers. Remember, if you can hear thunder, you are close enough to be struck by lightning. Torrential rainfall is occurring with this storm, and may lead to flash flooding. Do not drive your vehicle through flooded roadways.
Also In Effect For
This same Severe Thunderstorm Warning also covers:
Other Active Alerts in Maryland
Severe Thunderstorm Watch
Severe Thunderstorm Watch
Severe Thunderstorm Warning
Severe Thunderstorm Watch
Severe Thunderstorm Warning
Test Message
Get Severe Thunderstorm Warning Alerts for Frederick County
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Frequently Asked Questions
What does a Severe Thunderstorm Warning mean for Frederick County, Maryland?
A thunderstorm capable of producing damaging winds of 58+ mph and/or 1-inch hail has been detected.
Is this Severe Thunderstorm Warning currently active?
Yes — this alert is active as of our last check (1 minute ago). It's set to expire August 27, 2026 at 7:45 PM ET.
How do I get notified about Severe Thunderstorm Warning alerts for Frederick County?
Download StormCast free on Google Play and set Frederick County, Maryland as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Severe Thunderstorm Warning is also in effect for Carroll County, Howard County, Montgomery County, Loudoun County.