Alert archive / Virginia / Special Weather Statements in 2012

Special Weather Statement, NWS Baltimore/Washington

March 25, 2012Greene County, Virginia

NWS Baltimore/Washington issued this special weather statement at Mar 25, 2012, 12:48 AM EDT for Greene County, Virginia. It was in force for 42 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
Mar 25, 2012, 12:48 AM EDT (04:48 UTC)
Expired
Mar 25, 2012, 1:30 AM EDT
In force
42 min
Issued by
NWS Baltimore/Washington

County Greene County, VA

The radar

The Sterling radar (KLWX), 128 km from the middle of the area, began a volume at 04:51 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

Roanoke, VA (KRNK), launched 00:00Z, 4.8 hours before the alert went out and 138 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, Roanoke, VA at 00:00Z on 2012-03-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 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, Roanoke, VA at 00:00Z on 2012-03-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.1939587897117Sfc1 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
47 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
741 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
71 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

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 Mar 24, 9:43 PM EDT, 3 hours 5 minutes earlier.

Area forecast discussion, Mar 24, 9:43 PM EDT, 3 hours 5 minutes before
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Hazardous weather outlook, Mar 24, 9:36 PM EDT, 3 hours 12 minutes before
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In the hours before

Special weather statement, Mar 24, 8:31 PM EDT, 4 hours 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
831 PM EDT SAT MAR 24 2012

VAZ025-026-036-037-250130-
NELSON VA-ROCKINGHAM VA-ALBEMARLE VA-AUGUSTA VA-
831 PM EDT SAT MAR 24 2012

...PERSISTENT MODERATE TO HEAVY RAIN TO AFFECT NELSON...
ROCKINGHAM...ALBEMARLE AND AUGUSTA COUNTIES...

AT 828 PM EDT...DOPPLER RADAR INDICATED THUNDERSTORMS DEVELOPING
ACROSS PORTIONS OF AUGUSTA...ALBEMARLE...AND NELSON COUNTIES. THESE
THUNDERSTORMS WERE NEARLY STATIONARY...AND PRODUCING OVER ONE HALF
INCH OF RAIN PER HOUR IN SPOTS. AT THIS TIME...THESE STORMS ARE NOT
PRODUCING RAIN HEAVY ENOUGH TO CAUSE FLASH FLOODING...BUT SHOULD
THEY PERSIST FOR A LONGER PERIOD...FLASH FLOODING MAY BECOME
POSSIBLE...ESPECIALLY IN THE MORE RUGGED TERRAIN.

LOCATIONS AFFECTED BY THESE THUNDERSTORMS INCLUDE PORT REPUBLIC...
CRIMORA...WINTERGREEN...NORWOOD...AND BATESVILLE.

PONDING OF WATER ON RODWAYS...AND REDUCED VISIBILITY...ARE POSSIBLE.
USE CAUTION WHILE TRAVELING. STAY ALERT TO THE POTENTIAL FOR FLASH
FLOODING AND TAKE ACTION IF FLASH FLOOD WARNINGS ARE ISSUED.

&&

LAT...LON 3755 7891 3769 7899 3772 7907 3778 7909
      3780 7917 3789 7916 3809 7949 3816 7945
      3849 7916 3814 7850 3763 7876 3763 7881
      3760 7881 3758 7883 3756 7881 3753 7883
TIME...MOT...LOC 0028Z 179DEG 2KT 3786 7889

JE
Special weather statement, Mar 24, 8:38 PM EDT, 4 hours 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
838 PM EDT SAT MAR 24 2012

VAZ025-037-250115-
ALBEMARLE VA-AUGUSTA VA-
838 PM EDT SAT MAR 24 2012

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

AT 838 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 3 MILES
EAST OF CRIMORA...MOVING WEST AT 5 MPH.

LOCATIONS IMPACTED INCLUDE CRIMORA AND WAYNESBORO.

HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS. RAINFALL AMOUNTS IN
EXCESS OF ONE INCH ARE POSSIBLE WITH THIS STORM.

SMALL HAIL CAN BE EXPECTED WITH THIS STORM.

&&

LAT...LON 3824 7895 3823 7877 3821 7874 3809 7871
      3804 7896
TIME...MOT...LOC 0038Z 077DEG 3KT 3815 7878

BJL
Special weather statement, Mar 24, 10:48 PM EDT, 2 hours before
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Special weather statement, Mar 24, 11:43 PM EDT, 1 hour 5 minutes before
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Special weather statement, Mar 25, 12:48 AM EDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 24, 8:31 PM EDTSpecial Weather StatementLWXAugusta, Nelson, City of Staunton, City of Waynesboro59 min
Mar 24, 8:38 PM EDTSpecial Weather StatementLWXCity of Waynesboro37 min
Mar 24, 8:50 PM EDTFlash Flood WarningLWXAlbemarle, Augusta3 hr
Mar 24, 10:48 PM EDTSpecial Weather StatementLWXAlbemarle, City of Charlottesville57 min
Mar 24, 11:43 PM EDTSpecial Weather StatementLWXAlbemarle, Greene, Orange, Spotsylvania, City of Charlottesville47 min
Mar 25, 4:15 AM EDTSmall Craft AdvisoryLWX57 hr
Mar 25, 2:52 PM EDTFreeze WatchLWXArlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 21 more26 hr

Nearby

Special Weather Statements in Virginia, 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.