Severe Severe Storm ● Monitoring
Severe Thunderstorm Watch issued October 16 at 4:37PM EDT until October 16 at 8:00PM EDT by NWS Baltimore MD/Washington DC, United States of America
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
SEVERE THUNDERSTORM WATCH 686 REMAINS VALID UNTIL 8 PM EDT THIS
EVENING FOR THE FOLLOWING AREAS
THE DISTRICT OF COLUMBIA
IN MARYLAND THIS WATCH INCLUDES 14 COUNTIES
IN CENTRAL MARYLAND
ANNE ARUNDEL HOWARD
MONTGOMERY
PRINCE GEORGES
IN NORTH CENTRAL MARYLAND
CARROLL FREDERICK
WASHINGTON
IN NORTHEAST MARYLAND
CECIL
IN NORTHERN MARYLAND
BALTIMORE
BALTIMORE CITY
HARFORD
IN SOUTHERN MARYLAND
CALVERT CHARLES
ST. MARYS
IN VIRGINIA THIS WATCH INCLUDES 25 COUNTIES
IN CENTRAL VIRGINIA
CITY OF FREDERICKSBURG
GREENE KING GEORGE
ORANGE SPOTSYLVANIA
IN NORTHERN VIRGINIA
ARLINGTON
CITY OF ALEXANDRIA
CITY OF FAIRFAX
CITY OF FALLS CHURCH
CITY OF MANASSAS
CITY OF MANASSAS PARK
CULPEPER FAIRFAX
FAUQUIER LOUDOUN
PRINCE WILLIAM
STAFFORD
IN NORTHWEST VIRGINIA
CITY OF WINCHESTER
CLARKE FREDERICK
MADISON PAGE
RAPPAHANNOCK
SHENANDOAH WARREN
IN WEST VIRGINIA THIS WATCH INCLUDES 2 COUNTIES
IN PANHANDLE WEST VIRGINIA
BERKELEY JEFFERSON
THIS INCLUDES THE CITIES OF ABERDEEN, ABINGDON, ADAMS MORGAN,
ADEN, AIRLIE, ALBIN, ALEXANDRIA, ALONZAVILLE, ALSOP, ANDORA,
ANNANDALE, ANNAPOLIS, APPLETON, ARCO, ARKENDALE, ARLINGTON,
ARNOLD, BAKERTON, BALLENGER CREEK, BALLSTON, BALTIMORE, BARCROFT,
BARKSDALE, BAY VIEW, BENTONVILLE, BERRYVILLE, BETHEL, BETHESDA,
BLAKE, BLOOMERY, BOHEMIAS MILLS, BOWIE, BOYDS, BRANTWOOD,
BROKENBURG, BROOKFIELD, BROOMES ISLAND, BUCKEYSTOWN, BUCKTON,
BURKE, BURR HILL, BYNUM, CALIFORNIA, CALLAWAY, CARDOVA, CATALPA,
CATONSVILLE, CEDAR GROVE, CEDARVILLE, CHANTILLY, CHARLES TOWN,
CHERRYDALE, CHESAPEAKE BEACH, CHESTER GAP, CLARKSVILLE, CLARY,
CLINTON, COLLEGE PARK, COLUMBIA, COMPTON, COUNTRYSIDE,
COVE POINT, CULPEPER, DAHLGREN, DALE CITY, DAMERON, DRUM POINT,
DULLES INTERNATIONAL AIRPORT, DUNDALK, DUNKIRK, EDGEWOOD,
ELDERSBURG, E
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | District of Columbia, DC; Anne Arundel, MD; Baltimore, MD; Calvert, MD; Carroll, MD; Cecil, MD; Charles, MD; Frederick, MD; Harford, MD; Howard, MD; Montgo |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Future |
| Cap Certainty | Possible |
| Cap Expires | 2026-10-16T20:00:00-04:00 |
Official source
Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by WMO Alert Hub (national weather services).
View original reportAlso reported by: WMO
This event as JSON · API and licence
Source updated 3 days ago (Oct 16, 2026 20:39 UTC) · we last heard from WMO Alert Hub (national weather services) 1 second ago
On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.
Internet connectivity at the time
Internet connectivity in United States dropped 27 hours after this event, and stayed disrupted for about 1 hour.
From 18 Oct 2026 00:00 UTC to 18 Oct 2026 01:00 UTC. Detected by active probing — networks that stopped answering.
Internet outages have many causes — damaged cables, power failures, network maintenance and deliberate shutdowns among them. IODA detects the loss of connectivity and does not attribute it to anything. This is shown because it happened at the same time, not because one caused the other.
Measured by IODA, Georgia Institute of Technology.
About this location
The agency did not publish coordinates for this warning. The pin is the centre of the country, not the location of the event — read the area name, not the map, for where it applies.
Area as the agency stated it: District of Columbia, DC; Anne Arundel, MD; Baltimore, MD; Calvert, MD; Carroll, MD; Cecil, MD; Charles, MD; Frederick, MD; Harford, MD; Howard, MD; Montgo
Official authorities in United States
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for United States →Earlier severe storm events in United States
Severe and extreme events of the same kind, before this one. Listed for scale, not because they are connected to it.
Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.