Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Baltimore/Washington

August 1, 2012Prince William County, City of Manassas, City of Manassas Park, Virginia

NWS Baltimore/Washington issued this special weather statement at Aug 1, 2012, 10:10 PM EDT for Prince William County, City of Manassas, City of Manassas Park, Virginia. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 1, 2012, 10:10 PM EDT (02:10 UTC)
Expired: Aug 1, 2012, 10:45 PM EDT
In force: 35 min
Issued by: NWS Baltimore/Washington

Counties City of Manassas, VA, City of Manassas Park, VA, Prince William County, VA

The radar

The Sterling radar (KLWX), 19 km from the middle of the area, began a volume at 02:12 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 nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.2 hours before the alert went out and 18 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: 1783 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1261 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 1, 9:21 PM EDT, 49 minutes earlier.

Area forecast discussion, Aug 1, 9:21 PM EDT, 49 minutes before

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Hazardous weather outlook, Aug 1, 9:36 PM EDT, 34 minutes before

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In the hours before

Local storm report, Aug 1, 6:25 PM EDT, 3 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
625 PM EDT WED AUG 01 2012

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

0535 PM     HAIL             2 NW GERRARDSTOWN       39.38N  78.12W
08/01/2012  E0.75 INCH       BERKELEY           WV   PUBLIC

&&

EVENT NUMBER LWX1201019

CJL

Special weather statement, Aug 1, 6:30 PM EDT, 3 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
630 PM EDT WED AUG 1 2012

VAZ053-012300-
FAIRFAX VA-
630 PM EDT WED AUG 1 2012

...STRONG THUNDERSTORM TO AFFECT FAIRFAX COUNTY...

AT 630 PM EDT...A STRONG THUNDERSTORM WAS LOCATED OVER CENTREVILLE...
MOVING EAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE CHANTILLY AND FAIRFAX.

HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.

PENNY-SIZE TO NICKEL-SIZE HAIL CAN BE EXPECTED WITH THIS STORM.

&&

LAT...LON 3886 7726 3874 7737 3885 7749 3890 7744
TIME...MOT...LOC 2230Z 286DEG 9KT 3886 7742

Special weather statement, Aug 1, 7:05 PM EDT, 3 hours 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
705 PM EDT WED AUG 1 2012

WVZ055-502-506-012330-
EASTERN PENDLETON WV-HARDY WV-EASTERN GRANT WV-
705 PM EDT WED AUG 1 2012

...STRONG THUNDERSTORM TO AFFECT EASTERN PENDLETON...HARDY AND
EASTERN GRANT COUNTIES...

AT 705 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 3 MILES NORTH OF
LANDES...MOVING SOUTHEAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE ROUGH RUN.

HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.

PENNY-SIZE TO NICKEL-SIZE HAIL CAN BE EXPECTED WITH THIS STORM.

&&

LAT...LON 3885 7900 3876 7922 3896 7927 3901 7915
TIME...MOT...LOC 2305Z 324DEG 8KT 3894 7917

Special weather statement, Aug 1, 7:21 PM EDT, 2 hours 49 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
721 PM EDT WED AUG 1 2012

VAZ025-503-504-012345-
EASTERN HIGHLAND VA-WESTERN HIGHLAND VA-AUGUSTA VA-
721 PM EDT WED AUG 1 2012

...STRONG THUNDERSTORM TO AFFECT HIGHLAND AND AUGUSTA COUNTIES...

AT 721 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 4 MILES SOUTH OF
MUSTOE...MOVING SOUTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE CLOVER CREEK AND WILLIAMSVILLE.

HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.

PENNY-SIZE TO NICKEL-SIZE HAIL CAN BE EXPECTED WITH THIS STORM.

&&

LAT...LON 3834 7963 3819 7940 3814 7945 3816 7944
      3816 7949 3815 7951 3815 7953 3818 7953
      3821 7965 3828 7971
TIME...MOT...LOC 2321Z 308DEG 12KT 3826 7962

Special weather statement, Aug 1, 8:20 PM EDT, 1 hour 50 minutes before

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Special weather statement, Aug 1, 10:10 PM EDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 8:42 PM EDT	Severe Thunderstorm Warning	LWX	Shenandoah	38 min
Aug 1, 8:54 PM EDT	Coastal Flood Advisory	LWX	Arlington, City of Alexandria, City of Falls Church	14 hr
Aug 2, 4:02 PM EDT	Special Marine Warning	LWX		69 min
Aug 2, 4:30 PM EDT	Special Weather Statement	LWX	King George	30 min
Aug 2, 4:32 PM EDT	Special Marine Warning	LWX		28 min
Aug 2, 4:40 PM EDT	Special Marine Warning	LWX		65 min
Aug 2, 5:38 PM EDT	Special Marine Warning	LWX		52 min
Aug 2, 6:10 PM EDT	Special Marine Warning	LWX		69 min
Aug 2, 2:40 PM EDT	Special Weather Statement	LWX	Prince George's	35 min
Aug 2, 2:55 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Prince George's	18 min
Aug 2, 3:39 PM EDT	Special Weather Statement	LWX	Howard	36 min
Aug 2, 4:00 PM EDT	Special Weather Statement	LWX	Anne Arundel	30 min
Aug 2, 4:28 PM EDT	Special Weather Statement	LWX	City of Baltimore	32 min
Aug 2, 4:52 PM EDT	Special Weather Statement	LWX	City of Baltimore	23 min
Aug 2, 5:12 PM EDT	Special Weather Statement	LWX	Saint Mary's	33 min
Aug 1, 8:20 PM EDT	Special Weather Statement	LWX	Hardy	25 min

Nearby

Special Weather Statements in Virginia, 2012 Every special weather statement in 2012

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.