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240-291-8439
8 active alerts — Flash Flood Warning 240-291-8439
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Storm Pulse.

Live severe weather tracking across our Maryland, Pennsylvania, West Virginia, and Virginia service region. Active National Weather Service alerts, NEXRAD radar, and auto-published response pages — all in one operations view.

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Active alerts

8 alerts active in our coverage area.

Source: api.weather.gov · 10-min cache
  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 3:55PM EDT until July 10 at 5:45PM EDT by NWS Pittsburgh PA

    Fayette, PA; Greene, PA; Washington, PA; Westmoreland, PA

    Expires Fri 9:45 PM

  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 3:55PM EDT until July 10 at 7:00PM EDT by NWS Pittsburgh PA

    Carroll, OH; Columbiana, OH; Jefferson, OH; Allegheny, PA; Beaver, PA; Butler, PA; Lawrence, PA; Hancock, WV

    Expires Fri 11:00 PM

  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 3:52PM EDT until July 10 at 5:45PM EDT by NWS State College PA

    Lancaster, PA

    Expires Fri 9:45 PM

  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 3:22PM EDT until July 10 at 4:15PM EDT by NWS Pittsburgh PA

    Armstrong, PA; Butler, PA; Clarion, PA

    Expires Fri 8:15 PM

  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 3:19PM EDT until July 10 at 6:15PM EDT by NWS Pittsburgh PA

    Allegheny, PA

    Expires Fri 10:15 PM

  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 3:10PM EDT until July 10 at 6:15PM EDT by NWS Pittsburgh PA

    Armstrong, PA; Beaver, PA; Butler, PA; Indiana, PA; Lawrence, PA; Westmoreland, PA

    Expires Fri 10:15 PM

  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 3:04PM EDT until July 10 at 6:00PM EDT by NWS Pittsburgh PA

    Clarion, PA; Forest, PA; Jefferson, PA; Venango, PA

    Expires Fri 10:00 PM

  • Severe·Flash Flood Warning·Immediate

    Flash Flood Warning issued July 10 at 2:38PM EDT until July 10 at 4:15PM EDT by NWS Pittsburgh PA

    Butler, PA; Lawrence, PA; Mercer, PA; Venango, PA

    Expires Fri 8:15 PM

Coverage map

Service region — all counties clear.

Stylized tile layout of the 18 priority counties Catalyst tracks across MD · PA · WV · VA. UGC-coded — when NOAA NWS issues an alert affecting a county code, the corresponding tile lights up here.

Live · 10-min cache
PAFultonPAFranklinPAAdamsPACumberlandMDAlleganyWVHampshireWVMorganMDWashingtonMDFrederickMDCarrollWVBerkeleyWVJeffersonMDMontgomeryVAShenandoahVAFrederickVAClarkeVAWarrenVALoudoun
NormalModerateSevereExtreme
Affected counties

All service-area counties clear.

UGC-coded county status from NOAA NWS alerts. Mapping is deterministic — if a county code appears in any active alert affecting our coverage, it shows here.

18 priority counties tracked

Maryland · 5 counties

  • Washington County

    Hagerstown

    Normal
  • Frederick County

    Frederick

    Normal
  • Carroll County

    Westminster

    Normal
  • Allegany County

    Cumberland

    Normal
  • Montgomery County

    Rockville

    Normal

West Virginia · 4 counties

  • Berkeley County

    Martinsburg

    Normal
  • Jefferson County

    Charles Town

    Normal
  • Morgan County

    Berkeley Springs

    Normal
  • Hampshire County

    Romney

    Normal

Pennsylvania · 4 counties

  • Franklin County

    Chambersburg

    Normal
  • Adams County

    Gettysburg

    Normal
  • Cumberland County

    Carlisle

    Normal
  • Fulton County

    McConnellsburg

    Normal

Virginia · 5 counties

  • Frederick County, VA

    Winchester

    Normal
  • Clarke County

    Berryville

    Normal
  • Warren County

    Front Royal

    Normal
  • Shenandoah County

    Woodstock

    Normal
  • Loudoun County

    Leesburg

    Normal
NEXRAD radar

Live regional radar.

KLWX Sterling, VA NEXRAD — covers our entire service region. Refreshes every few minutes from the National Weather Service.

Full radar on weather.gov
NWS NEXRAD radar loop for KLWX Sterling, VA — covering the Maryland, Pennsylvania, West Virginia, and Virginia service region

Image source: radar.weather.gov · public domain

Storm damage at your property?

Storm Pulse tracks the weather. /emergency tracks your loss.

If a storm has actually damaged your property — water intrusion, roof breach, downed tree, structural compromise — start at /emergency/storm. The 30-minute action steps are there and the response is the same 24/7 dispatch.

24/7 Emergency Response

Storm damage? Catalyst dispatches 24/7.

Catalyst crews stage across MD, PA, WV, and VA — call now or request emergency response.