Alert archive / Virginia / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 111, NWS Baltimore/Washington

June 21, 20167 counties in Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 21, 2016, 3:27 PM EDT for 7 counties in Virginia. It was in force for 48 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: Jun 21, 2016, 3:27 PM EDT (19:27 UTC)
Expired: Jun 21, 2016, 4:15 PM EDT
In force: 48 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties City of Alexandria, VA, City of Fairfax, VA, City of Manassas, VA, City of Manassas Park, VA, Fairfax County, VA, Loudoun County, VA, Prince William County, VA

The radar

The Sterling radar (KLWX), 18 km from the middle of the area, began a volume at 19:28 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
Jun 21, 1:06 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.5 hours before the alert went out and 13 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 719 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 1478 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 143 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

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 Jun 21, 3:08 PM EDT, 19 minutes earlier.

Area forecast discussion, Jun 21, 3:08 PM EDT, 19 minutes before

Area Forecast Discussion
National Weather Service Baltimore MD/Washington DC
308 PM EDT TUE JUN 21 2016

.SYNOPSIS...
A cold front will cross the region this evening. High pressure
will briefly build in from Canada on Wednesday. A warm front will
lift north across the region Wednesday night. Another cold front
will cross the region later Thursday and Thursday night. High
pressure will build back across the area for the weekend.

&&

.NEAR TERM /THROUGH WEDNESDAY/...
Very active afternoon with plenty of showers and thunderstorms.
Severe Thunderstorm Watch is in effect until 9PM but will probably
be able to start shaving off portions of it as it becomes more
clear where the first line has stabilized the atmosphere.

Patchy fog possible overnight. Otherwise...high pressure from
Canada will usher in drier air for the region on Wednesday.
Temperatures will drop a bit but northwesterly downslope flow
likely to prevent a big drop.

&&

.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
Front that moves through as a cold front tonight will push back
north as a warm front on Wednesday night with rain and perhaps
embedded thunder moving back across the region. Very warm and
humid air mass moves in behind warm front for Thursday and we will
have another potential round of severe weather later Thursday into
Thursday evening. As front drops back south on Thursday night the
showers and thunderstorms will move southeast away from the area.

An upper trough of low pressure will swing across the region
Friday. There is a chance for a lingering shower or thunderstorm,
mainly across the west and south.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
High pressure will build into the region Friday night through
Sunday. Drier and cooler air will follow throughout the weekend.

This same area of high pressure will move offshore and closer
to southern New England Sunday night and Monday. A warm and more
humid return flow will evolve Sunday night through Tuesday. This
will help in fueling showers and thunderstorms each period. A few
thunderstorms could contain gusty winds.

&&

.AVIATION /19Z TUESDAY THROUGH SUNDAY/...
Brief IFR with severe thunderstorms across the region at present.
Hail and damaging winds main threat. This threat will rapidly
diminish this evening as cold front sinks south with VFR later
tonight thru Wednesday. Front moves back in as a warm front with
more rain later Wednesday night into early Thursday. Another round
of severe weather possible later Thursday into Thursday night.

Ifr conditions possible near CHO with any showers or
thunderstorms Friday. Vfr conditions all terminals Friday night.
Winds northeast around 5 knots Friday becoming southeast around 5
knots Friday night.

&&

.MARINE...
Marginal SCA continues at present. Also have damaging
thunderstorms with wind and hail moving across the waters thru
early this evening. Conditions improve later tonight and continue
dry thru Wednesday, though winds may be near SCA limits on
Wednesday. Warm front moves in with more rain later Wednesday
night then SCA looking likely ahead of next cold front on Thursday
into Thursday night, along with another round of t-storms.

No marine hazards expected Friday and Friday night.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...None.
MD...None.
VA...None.
WV...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for
     ANZ530>543.

&&

SYNOPSIS...RCM
NEAR TERM...RCM
SHORT TERM...RCM
LONG TERM...KLW
AVIATION...RCM/KLW
MARINE...RCM/KLW

Hazardous weather outlook, Jun 21, 1:15 PM EDT, 2 hours 12 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
115 PM EDT TUE JUN 21 2016

ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-221715-
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-
115 PM EDT TUE JUN 21 2016

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

ISOLATED SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL
WILL BE POSSIBLE THIS AFTERNOON AND EVENING IN NORTHERN
VIRGINIA...THE WASHINGTON DC METRO AREA...AND MARYLAND. THIS
INCLUDES THE TIDAL POTOMAC AND CENTRAL CHESAPEAKE BAY. A SEVERE
THUNDERSTORM WATCH IS IN EFFECT UNTIL 9 PM.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THERE WILL BE A CHANCE OF SEVERE THUNDERSTORMS THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON.

MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053-
055-501>506-221715-
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-
115 PM EDT TUE JUN 21 2016

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

ISOLATED SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL
WILL BE POSSIBLE THIS AFTERNOON AND EVENING IN EASTERN WEST
VIRGINIA...NORTHERN AND CENTRAL VIRGINIA...AND NORTHERN...CENTRAL
AND WESTERN MARYLAND. A SEVERE THUNDERSTORM WATCH IS IN EFFECT
UNTIL 9 PM.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THERE WILL BE A CHANCE OF SEVERE THUNDERSTORMS THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON.

In the hours before

Local storm report, Jun 21, 2:21 PM EDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
221 PM EDT TUE JUN 21 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0145 PM     TSTM WND DMG     2 SSW GAITHER           39.33N  77.01W
06/21/2016                   HOWARD             MD   TRAINED SPOTTER

            MULTIPLE LARGE TREES DOWN. ONE TREE ONTO A FENCE.

&&

EVENT NUMBER LWX1604157

KLW

Local storm report, Jun 21, 2:29 PM EDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
229 PM EDT TUE JUN 21 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0225 PM     HAIL             1 SE MONTGOMERY VILLAGE 39.17N  77.18W
06/21/2016  M1.00 INCH       MONTGOMERY         MD   TRAINED SPOTTER

            QUARTER SIZE HAIL

&&

EVENT NUMBER LWX1604158

KLW

Local storm report, Jun 21, 2:35 PM EDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
235 PM EDT TUE JUN 21 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0225 PM     HAIL             1 SSW MONTGOMERY VILLAG 39.16N  77.20W
06/21/2016  M0.88 INCH       MONTGOMERY         MD   COCORAHS

&&

EVENT NUMBER LWX1604159

RCM

Local storm report, Jun 21, 3:00 PM EDT, 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
300 PM EDT TUE JUN 21 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0258 PM     FLOOD            1 ESE BOWIE             38.95N  76.73W
06/21/2016                   PRINCE GEORGES     MD   DEPT OF HIGHWAYS

            ACCELERATION LANE AND ONE WESTBOUND TRAFFIC LANE
            COVERED BY WATER ON US 50 JUST WEST OF EXIT 13.

&&

EVENT NUMBER LWX1604160

JE

Local storm report, Jun 21, 3:03 PM EDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
303 PM EDT TUE JUN 21 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0137 PM     TSTM WND DMG     1 NNW GLENELG           39.28N  77.00W
06/21/2016                   HOWARD             MD   TRAINED SPOTTER

            MULTIPLE LARGE TREES TWISTED AND BROKEN IN HALF

&&

EVENT NUMBER LWX1604161

KLW

Local storm report, Jun 21, 3:22 PM EDT, 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
322 PM EDT TUE JUN 21 2016

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0145 PM     TSTM WND DMG     COLUMBIA                39.20N  76.86W
06/21/2016                   HOWARD             MD   NWS EMPLOYEE

            DOZENS OF TREE LIMBS 5 TO 6 INCHES BLOCKING ROADS

&&

EVENT NUMBER LWX1604162

RRS

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 12:50 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	40 min
Jun 21, 1:11 PM EDT	Special Marine Warning	LWX		2 hr
Jun 21, 1:12 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Fauquier, Loudoun, Prince William	48 min
Jun 21, 1:23 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	52 min
Jun 21, 1:51 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	39 min
Jun 21, 2:02 PM EDT	Severe Thunderstorm Warning	LWX	Madison, Page, Shenandoah, Warren	43 min
Jun 21, 2:05 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Fauquier, Frederick, Loudoun, City of Winchester	20 min
Jun 21, 2:16 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, Augusta, Greene, Rockingham, City of Harrisonburg	44 min
Jun 21, 2:20 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Falls Church	36 min
Jun 21, 2:24 PM EDT	Special Marine Warning	LWX		2 hr
Jun 21, 2:32 PM EDT	Special Marine Warning	LWX		43 min
Jun 21, 2:35 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Madison, Rappahannock	40 min
Jun 21, 2:54 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Fauquier, Loudoun, Prince William	34 min
Jun 21, 2:58 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	47 min
Jun 21, 3:02 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier	15 min
Jun 21, 3:06 PM EDT	Special Marine Warning	LWX		84 min
Jun 21, 3:17 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Prince William	13 min
Jun 21, 3:31 PM EDT	Special Marine Warning	LWX		119 min
Jun 21, 3:32 PM EDT	Special Marine Warning	LWX		118 min
Jun 21, 3:40 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	20 min
Jun 21, 3:51 PM EDT	Severe Thunderstorm Warning	LWX	Page, Rockingham, Shenandoah	39 min
Jun 21, 4:15 PM EDT	Special Marine Warning	LWX		2 hr
Jun 21, 4:23 PM EDT	Severe Thunderstorm Warning	LWX	Madison, Page, Rappahannock, Shenandoah	28 min
Jun 21, 4:31 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, Loudoun, City of Winchester	29 min
Jun 21, 4:43 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	36 min
Jun 21, 4:49 PM EDT	Areal Flood Warning	LWX	Madison, Page, Rappahannock, Rockingham, Shenandoah	6 hr
Jun 21, 4:50 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Madison, Rappahannock	26 min
Jun 21, 4:53 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Fauquier, Loudoun, Prince William	52 min
Jun 21, 4:57 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	48 min
Jun 21, 5:10 PM EDT	Special Marine Warning	LWX		95 min
Jun 21, 5:31 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	44 min
Jun 21, 5:32 PM EDT	Flash Flood Warning	LWX	Fairfax, Fauquier, Loudoun, Prince William, City of Fairfax	3 hr
Jun 21, 5:44 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick	46 min
Jun 21, 5:51 PM EDT	Flash Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	3 hr
Jun 21, 6:11 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	49 min
Jun 21, 6:15 PM EDT	Special Marine Warning	LWX		2 hr
Jun 21, 6:36 PM EDT	Special Marine Warning	LWX		84 min
Jun 21, 7:04 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Falls Church	14 min
Jun 21, 12:01 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	44 min
Jun 21, 12:39 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Washington	36 min
Jun 21, 12:47 PM EDT	Severe Thunderstorm Warning	LWX	Washington	27 min
Jun 21, 1:01 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Frederick, Howard, Montgomery, Washington	31 min
Jun 21, 1:19 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Carroll, Frederick, Howard, Montgomery and 2 more	56 min
Jun 21, 1:34 PM EDT	Tornado Warning	LWX	Baltimore, Howard	26 min
Jun 21, 2:05 PM EDT	Flash Flood Warning	LWX	Anne Arundel, Baltimore, Harford, Howard, City of Baltimore	4 hr
Jun 21, 2:08 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel	52 min
Jun 21, 2:13 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	32 min
Jun 21, 2:28 PM EDT	Flash Flood Warning	LWX	Howard, Montgomery	3 hr
Jun 21, 2:53 PM EDT	Areal Flood Warning	LWX	Anne Arundel, Howard, Prince George's	6 hr
Jun 21, 3:11 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Montgomery, Prince George's	49 min
Jun 21, 3:29 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Charles, Prince George's, Saint Mary's	22 min
Jun 21, 3:45 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Charles, Prince George's, Saint Mary's	60 min
Jun 21, 5:17 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Frederick, Howard, Montgomery	43 min
Jun 21, 6:06 PM EDT	Flash Flood Warning	LWX	Baltimore, City of Baltimore	3 hr
Jun 21, 6:31 PM EDT	Severe Thunderstorm Warning	LWX	Washington	44 min
Jun 21, 7:09 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	51 min
Jun 21, 7:31 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Howard, Montgomery	44 min
Jun 21, 7:51 PM EDT	Severe Thunderstorm Warning	LWX	Washington	11 min
Jun 21, 4:17 PM EDT	Severe Thunderstorm Warning	LWX	Grant, Hardy, Pendleton	28 min
Jun 21, 4:58 PM EDT	Severe Thunderstorm Warning	LWX	Grant	15 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2016 Every severe thunderstorm warning in 2016

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.