Alert archive / Maryland / Tornado Warnings in 2012

Tornado Warning 29, NWS Baltimore/Washington

August 7, 20124 counties in Maryland

NWS Baltimore/Washington issued this tornado warning at Aug 7, 2012, 5:57 PM EDT for 4 counties in Maryland. It was in force for 33 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 7, 2012, 5:57 PM EDT (21:57 UTC)
Expired
Aug 7, 2012, 6:30 PM EDT
In force
33 min
Issued by
NWS Baltimore/Washington
Area
Storm-based polygon

Counties Calvert County, MD, Charles County, MD, Prince George's County, MD, Saint Mary's County, MD

The radar

The Sterling radar (KLWX), 87 km from the middle of the area, began a volume at 22:00 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, 10.0 hours before the alert went out and 79 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 2012-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 2012-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 3 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1593 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
3 m²/s²
0-3 km storm-relative helicity
20 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.

557 
WFUS51 KLWX 072157
TORLWX
MDC009-017-033-037-072230-
/O.NEW.KLWX.TO.W.0029.120807T2157Z-120807T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
557 PM EDT TUE AUG 7 2012

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN CHARLES COUNTY IN SOUTHERN MARYLAND...
  NORTHERN ST. MARYS COUNTY IN SOUTHERN MARYLAND...
  SOUTHEASTERN PRINCE GEORGES COUNTY IN CENTRAL MARYLAND...
  WESTERN CALVERT COUNTY IN SOUTHERN MARYLAND...

* UNTIL 630 PM EDT

* AT 556 PM EDT...A CONFIRMED TORNADO WAS REPORTED NEAR HALLOWING
  POINT...AND WAS MOVING NORTHWEST AT 5 MPH. THIS TORNADO HAS BEEN
  CONFIRMED BY LAW ENFORCEMENT.

* LOCATIONS IMPACTED INCLUDE...
  HALLOWING POINT...
  GOLDEN BEACH...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR
VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3851 7677 3858 7668 3852 7656 3843 7666
TIME...MOT...LOC 2158Z 122DEG 3KT 3850 7665

$$
2 follow-up statements
774 
WWUS51 KLWX 072213
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
613 PM EDT TUE AUG 7 2012

MDC009-017-033-037-072230-
/O.CON.KLWX.TO.W.0029.000000T0000Z-120807T2230Z/
CHARLES MD-ST. MARYS MD-PRINCE GEORGES MD-CALVERT MD-
613 PM EDT TUE AUG 7 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM EDT FOR
CALVERT...PRINCE GEORGES...ST. MARYS AND CHARLES COUNTIES...

AT 609 PM EDT...A CONFIRMED TORNADO WAS LOCATED NEAR HALLOWING
POINT...AND WAS MOVING NORTHWEST AT 5 MPH.

THIS TORNADO HAS BEEN CONFIRMED BY LAW ENFORCEMENT.

LOCATIONS IMPACTED INCLUDE...
  HALLOWING POINT...
  BENEDICT...
  GOLDEN BEACH...

TRAINED SPOTTERS AND LAW ENFORCEMENT REPORTED A WATERSPOUT ON THE 
PATUXENT RIVER NEAR THE BENEDICT BRIDGE. THIS WATERSPOUT COULD MOVE 
ONSHORE AT ANY TIME.

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING AND AVOID WINDOWS. IF OUTDOORS OR IN A MOBILE HOME OR
VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3850 7674 3857 7668 3853 7659 3845 7665
TIME...MOT...LOC 2212Z 122DEG 3KT 3851 7666

$$
724 
WWUS51 KLWX 072224
SVSLWX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
624 PM EDT TUE AUG 7 2012

MDC009-017-033-037-072234-
/O.EXP.KLWX.TO.W.0029.000000T0000Z-120807T2230Z/
CHARLES MD-ST. MARYS MD-PRINCE GEORGES MD-CALVERT MD-
624 PM EDT TUE AUG 7 2012

...THE TORNADO WARNING WILL EXPIRE AT 630 PM EDT FOR CALVERT...PRINCE
GEORGES...ST. MARYS AND CHARLES COUNTIES...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED. THUS THE
TORNADO WARNING HAS BEEN ALLOWED TO EXPIRE.

LAT...LON 3850 7674 3857 7668 3853 7659 3845 7665
TIME...MOT...LOC 2224Z 122DEG 3KT 3852 7667

$$

KONARIK

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 7, 8:16 AM EDTSpecial Weather StatementLWXSaint Mary's59 min

Nearby

Tornado Warnings in Maryland, 2012Every tornado warning in 2012Tornadoes 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.