Alert archive / Virginia / Severe Thunderstorm Warnings in 2018
Severe Thunderstorm Warning 76, NWS Baltimore/Washington
NWS Baltimore/Washington issued this severe thunderstorm warning at May 22, 2018, 3:25 PM EDT for Fairfax County, Loudoun County, Virginia; Frederick County, Montgomery County, Maryland. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 22, 2018, 3:25 PM EDT (19:25 UTC)
- Expired
- May 22, 2018, 4:15 PM EDT
- In force
- 50 min
- Issued by
- NWS Baltimore/Washington
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Frederick County, MD, Montgomery County, MD, Fairfax County, VA, Loudoun County, VA
The radar
The Sterling radar (KLWX), 20 km from the middle of the area, began a volume at 19:25 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 22, 2:33 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.4 hours before the alert went out and 20 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 744 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 99 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at May 22, 10:22 AM EDT, 5 hours 3 minutes earlier.
Area forecast discussion, May 22, 10:22 AM EDT, 5 hours 3 minutes before
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</html>Hazardous weather outlook, May 22, 2:51 PM EDT, 34 minutes before
Hazardous Weather Outlook National Weather Service Baltimore MD/Washington DC 251 PM EDT Tue May 22 2018 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-231900- Chesapeake Bay north of Pooles Island MD- Chesapeake Bay from Pooles Island to Sandy Point MD- Chesapeake Bay from Sandy Point to North Beach MD- Chesapeake Bay from North Beach to Drum Point MD- Chesapeake Bay from Drum Point MD to Smith Point VA- Tidal Potomac from Key Bridge to Indian Head MD- Tidal Potomac from Indian Head to Cobb Island MD- Tidal Potomac from Cobb Island MD to Smith Point VA- Patapsco River including Baltimore Harbor- Chester River to Queenstown MD-Eastern Bay- Choptank River to Cambridge MD and the Little Choptank River- Patuxent River to Broomes Island MD- Tangier Sound and the inland waters surrounding Bloodsworth Island-District of Columbia-Southern Baltimore-Prince Georges- Anne Arundel-Charles-St. Marys-Calvert-Southeast Harford- Prince William/Manassas/Manassas Park-Fairfax- Arlington/Falls Church/Alexandria-Stafford-Spotsylvania- King George- 251 PM EDT Tue May 22 2018 This Hazardous Weather Outlook is for the Maryland portion of the Chesapeake Bay, Tidal Potomac River, and adjacent counties in central Maryland and northern Virginia as well as the District of Columbia. .DAY ONE...This Afternoon and Tonight A Severe Thunderstorm Watch is in effect through 9pm for portions of southern and central Maryland, northern Virginia, and the District of Columbia. Scattered severe thunderstorms with damaging wind gusts and large hail are possible this afternoon and evening. Heavy rain from thunderstorms could also result in isolated instances of flooding. .DAYS TWO THROUGH SEVEN...Wednesday through Monday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-231900- Washington-Frederick MD-Carroll-Northern Baltimore- Extreme Western Allegany-Central and Eastern Allegany- Northwest Montgomery-Central and Southeast Montgomery- Northwest Howard-Central and Southeast Howard-Northwest Harford- Augusta-Rockingham-Shenandoah-Frederick VA-Page-Warren-Clarke- Nelson-Albemarle-Greene-Madison-Rappahannock-Orange-Culpeper- Northern Fauquier-Southern Fauquier-Western Highland- Eastern Highland-Western Loudoun-Eastern Loudoun- Northern Virginia Blue Ridge-Central Virginia Blue Ridge- Hampshire-Morgan-Berkeley-Jefferson-Hardy-Western Grant- Eastern Grant-Western Mineral-Eastern Mineral-Western Pendleton- Eastern Pendleton- 251 PM EDT Tue May 22 2018 This Hazardous Weather Outlook is for eastern West Virginia, northern and central Virginia, and central and western Maryland with the exception of Garrett County. .DAY ONE...This Afternoon and Tonight A Severe Thunderstorm Watch is in effect through 9pm for portions of northern and central Virginia, and portions of central Maryland. Scattered severe thunderstorms with damaging wind gusts and large hail are possible this afternoon and evening. Heavy rain from thunderstorms could also result in isolated instances of flooding. .DAYS TWO THROUGH SEVEN...Wednesday through Monday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
In the hours before
Local storm report, May 22, 2:44 PM EDT, 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
244 PM EDT TUE MAY 22 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1240 AM FLASH FLOOD 2 ENE YANKEETOWN 38.70N 78.92W
05/22/2018 ROCKINGHAM VA BROADCAST MEDIA
SIGNIFICANT FLASH FLOODING REPORTED IN THE YANKEETOWN
AND FULKS RUN AREAS, WITH WATER IN VEHICLES, NUMEROUS
ROADS CLOSED AND MANY STREAMS OUT OF THEIR BANKS.
&&
EVENT NUMBER LWX1800368
JELocal storm report, May 22, 2:48 PM EDT, 37 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
248 PM EDT TUE MAY 22 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1240 AM FLASH FLOOD 4 SSE YANKEETOWN 38.63N 78.92W
05/22/2018 ROCKINGHAM VA BROADCAST MEDIA
A PORTION OF HOPKINS GAP ROAD WAS SCOURED OUT NEAR
TURNER RUN AND THE BARE RIDGE ROAD INTERSECTION.
&&
EVENT NUMBER LWX1800369
JEThe office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 10:29 PM EDT | Flash Flood Warning | LWX | Rockingham | 3 hr |
| May 21, 11:44 PM EDT | Severe Thunderstorm Warning | LWX | Rockingham, City of Harrisonburg | 29 min |
| May 22, 12:53 AM EDT | River Flood Warning | LWX | Rockingham, Shenandoah | 6 hr |
| May 22, 6:01 AM EDT | Areal Flood Warning | LWX | Shenandoah | 11 hr |
| May 22, 3:14 PM EDT | Severe Thunderstorm Warning | LWX | Albemarle, Greene, Madison, Orange, Rockingham, City of Charlottesville | 46 min |
| May 22, 3:29 PM EDT | Special Marine Warning | LWX | 2 hr | |
| May 22, 4:27 PM EDT | Special Marine Warning | LWX | 2 hr | |
| May 22, 4:30 PM EDT | Special Marine Warning | LWX | 2 hr | |
| May 22, 4:43 PM EDT | Areal Flood Warning | LWX | Arlington, Fairfax, Prince William, City of Alexandria, City of Fairfax, City of Falls Church | 4 hr |
| May 22, 4:48 PM EDT | Severe Thunderstorm Warning | LWX | Fairfax, Prince William, City of Fairfax | 42 min |
| May 22, 5:17 PM EDT | Areal Flood Warning | LWX | Fairfax | 4 hr |
| May 22, 5:39 PM EDT | Special Marine Warning | LWX | 2 hr | |
| May 22, 5:47 PM EDT | Areal Flood Warning | LWX | Shenandoah | 6 hr |
| May 22, 6:29 PM EDT | Special Marine Warning | LWX | 2 hr | |
| May 22, 5:08 PM EDT | Severe Thunderstorm Warning | LWX | Charles, Prince George's | 52 min |
| May 22, 5:24 PM EDT | Severe Thunderstorm Warning | LWX | Anne Arundel | 16 min |
| May 21, 8:16 PM EDT | Areal Flood Warning | LWX | Grant | 3 hr |
Nearby
Severe Thunderstorm Warnings in Virginia, 2018Severe Thunderstorm Warnings in Maryland, 2018Every severe thunderstorm warning in 2018
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.