Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Baltimore/Washington

July 28, 2012Washington County, Maryland

NWS Baltimore/Washington issued this special weather statement at Jul 28, 2012, 3:13 PM EDT for Washington County, Maryland. It was in force for 27 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
Jul 28, 2012, 3:13 PM EDT (19:13 UTC)
Expired
Jul 28, 2012, 3:40 PM EDT
In force
27 min
Issued by
NWS Baltimore/Washington

County Washington County, MD

The radar

The Sterling radar (KLWX), 80 km from the middle of the area, began a volume at 19:15 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 12:00Z, 7.2 hours before the alert went out and 85 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-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 2012-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 552 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2012-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -15 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
552 J/kg
Mixed-layer CIN
-63 J/kg
Mixed-layer LCL
1087 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-15 m²/s²
0-3 km storm-relative helicity
8 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.3

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 Jul 28, 1:46 PM EDT, 1 hour 27 minutes earlier.

Area forecast discussion, Jul 28, 1:46 PM EDT, 1 hour 27 minutes before
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Hazardous weather outlook, Jul 28, 1:44 PM EDT, 1 hour 29 minutes before
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In the hours before

Local storm report, Jul 28, 9:44 AM EDT, 5 hours 29 minutes before
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Local storm report, Jul 28, 10:21 AM EDT, 4 hours 52 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1021 AM EDT SAT JUL 28 2012

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

0959 PM     TSTM WND DMG     1 WSW PLEASANT HILLS    39.48N  76.41W
07/26/2012                   HARFORD            MD   EMERGENCY MNGR

            TREE DOWN ON RECKORD ROAD BETWEEN HARFORD ROAD AND BEL
            AIR ROAD

1001 PM     TSTM WND DMG     BENSON                  39.51N  76.38W
07/26/2012                   HARFORD            MD   EMERGENCY MNGR

            TREE DOWN AT US ROUTE 1 AND HARFORD ROAD

&&

EVENT NUMBER LWX1200995
EVENT NUMBER LWX1200996

KRAMAR
Special weather statement, Jul 28, 1:40 PM EDT, 1 hour 33 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
140 PM EDT SAT JUL 28 2012

MDZ018-281800-
CALVERT MD-
140 PM EDT SAT JUL 28 2012

...STRONG THUNDERSTORM TO AFFECT CALVERT COUNTY...

AT 140 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 2 MILES SOUTHEAST
OF LUSBY...MOVING EAST AT 10 MPH.

LOCATIONS IMPACTED INCLUDE DRUM POINT AND COVE POINT.

THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

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

WIND GUSTS OF 40 TO 50 MPH CAN BE EXPECTED WITH THIS STORM.

&&

LAT...LON 3833 7640 3831 7642 3832 7644 3831 7645
      3833 7649 3835 7648 3839 7652 3847 7647
      3840 7639 3839 7637
TIME...MOT...LOC 1740Z 286DEG 9KT 3839 7641

JRK
Special weather statement, Jul 28, 3:13 PM EDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
313 PM EDT SAT JUL 28 2012

MDZ003-281940-
WASHINGTON MD-
313 PM EDT SAT JUL 28 2012

...STRONG THUNDERSTORM TO AFFECT WASHINGTON COUNTY...

AT 313 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 5 MILES NORTHWEST
OF CLEAR SPRING...MOVING EAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE LONG MEADOW...HAGERSTOWN AND MUNICIPAL
STADIUM.

STORM INTENSITY IS INCREASING...AND SEVERE WEATHER MAY DEVELOP
RAPIDLY. REMAIN ALERT...AND BE PREPARED TO TAKE ACTION IF WARNINGS
ARE ISSUED.

THIS STORM IS PRODUCING FREQUENT CLOUD TO GROUND LIGHTNING. MOVE
INDOORS IMMEDIATELY FOR YOUR SAFETY. IF YOU CAN HEAR THUNDER...YOU
ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

BRIEF HEAVY DOWNPOURS AND WIND GUSTS OF 40 TO 50 MPH CAN BE EXPECTED
WITH THIS STORM.

&&

LAT...LON 3956 7763 3968 7808 3973 7808 3973 7759
TIME...MOT...LOC 1913Z 271DEG 24KT 3971 7796

JRK

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 28, 1:37 PM EDTSpecial Marine WarningLWX83 min
Jul 28, 3:48 PM EDTSpecial Marine WarningLWX87 min
Jul 28, 4:12 PM EDTSpecial Weather StatementLWXRappahannock33 min
Jul 28, 4:17 PM EDTSevere Thunderstorm WarningLWXCulpeper, Fauquier, Rappahannock43 min
Jul 28, 4:50 PM EDTSpecial Weather StatementLWXAlbemarle, City of Charlottesville25 min
Jul 28, 4:59 PM EDTSpecial Weather StatementLWXFauquier31 min
Jul 28, 5:10 PM EDTSpecial Marine WarningLWX46 min
Jul 28, 5:13 PM EDTSpecial Weather StatementLWXCulpeper32 min
Jul 28, 5:25 PM EDTSpecial Weather StatementLWXPrince William35 min
Jul 28, 5:32 PM EDTSpecial Marine WarningLWX79 min
Jul 28, 5:39 PM EDTSpecial Marine WarningLWX2 hr
Jul 28, 5:49 PM EDTSevere Thunderstorm WarningLWXFairfax, Prince William41 min
Jul 28, 6:01 PM EDTSpecial Weather StatementLWXCulpeper29 min
Jul 28, 6:21 PM EDTSpecial Marine WarningLWX84 min
Jul 28, 7:31 PM EDTSpecial Marine WarningLWX60 min
Jul 28, 7:34 PM EDTSpecial Weather StatementLWXCity of Alexandria, City of Falls Church26 min
Jul 28, 7:40 PM EDTSpecial Marine WarningLWX2 hr
Jul 28, 7:42 PM EDTSpecial Weather StatementLWXKing George18 min
Jul 28, 1:40 PM EDTSpecial Weather StatementLWXCalvert20 min
Jul 28, 3:50 PM EDTSpecial Weather StatementLWXHarford25 min
Jul 28, 3:54 PM EDTSevere Thunderstorm WarningLWXHarford51 min
Jul 28, 4:03 PM EDTSpecial Weather StatementLWXWashington27 min
Jul 28, 4:28 PM EDTSpecial Weather StatementLWXFrederick47 min
Jul 28, 4:42 PM EDTSevere Thunderstorm WarningLWXHarford48 min
Jul 28, 5:05 PM EDTFlash Flood WarningLWXHarford103 min
Jul 28, 5:07 PM EDTSpecial Weather StatementLWXPrince George's38 min
Jul 28, 5:42 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Calvert, Prince George's30 min
Jul 28, 5:55 PM EDTSpecial Weather StatementLWXAnne Arundel35 min
Jul 28, 6:15 PM EDTSpecial Weather StatementLWXPrince George's30 min
Jul 28, 6:31 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Calvert, Charles, Prince George's32 min
Jul 28, 7:12 PM EDTSpecial Weather StatementLWXCalvert33 min
Jul 28, 7:19 PM EDTSpecial Weather StatementLWXPrince George's26 min
Jul 28, 7:48 PM EDTSpecial Weather StatementLWXPrince George's27 min
Jul 28, 7:50 PM EDTSpecial Weather StatementLWXSaint Mary's25 min
Jul 28, 7:56 PM EDTSevere Thunderstorm WarningLWXAnne Arundel, Calvert, Prince George's49 min

Nearby

Special Weather Statements in Maryland, 2012Every 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.