Alert archive / Maryland / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 149, NWS Baltimore/Washington

July 12, 2003Carroll County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 12, 2003, 6:04 PM EDT for Carroll County, Maryland. It was in force for 56 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: Jul 12, 2003, 6:04 PM EDT (22:04 UTC)
Expired: Jul 12, 2003, 7:00 PM EDT
In force: 56 min
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

County Carroll County, MD

The radar

The Sterling radar (KLWX), 77 km from the middle of the area, began a volume at 22:07 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, 10.1 hours before the alert went out and 76 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1482 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Jul 12, 3:15 PM EDT, 2 hours 49 minutes earlier.

Area forecast discussion, Jul 12, 3:15 PM EDT, 2 hours 49 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
315 PM EDT SAT JUL 12 2003

.EARLY PERIODS...
S/WV...ALTHO WKNG...PROGGED BY MM5/RGEM TO SLIDE THRU CWFA THIS
EVNG. QUITE A BIT OF CONVECTION IN OHIO VLY ATTM. ALTHO IT WL BE ON
THE WANE W/ LOSS OF DIURNAL HTG...STILL SHUD BE A LTL CROSSING THE
HILLS. AREA FVRBLY SITUATED IN RRQ OF UPR JET. DONT THINK ACTVTY WL
LAST MUCH PAST MIDNGT.

DIGGING IMPULSE SWINGING THRU BASE OF TROF TO PASS S OF AREA TMRW.
RGEM DEPICT JUICY QPF POISED JST SE OF CWFA. PRVS FCST LEFT INTACT.
AMS TO THE NW SHUD BE DRIER/MORE STBL W/ BLDG SFC HIPRES.

W/ NO MOS TO COMPARE AGAINST...NOT WILLING TO MAKE WHOLESCALE CHGS
TO TEMP FCST. HWVR...SINCE DECENT CAA BHND S/WV TNGT...DID SHAVE A
CPL DEG OFF CRRNT MAXT GRID FOR TMRW. MM5 SFC TEMP PLOT UP TO 5 DEG
F COOLER 18Z TMRW THAN 18Z TDA. THIS EDIT LIKELY TO HV NO IMPACT
UPON WORDED ZFP.

HTS

LONG TERM(SUN NGT-SAT)...
UPPER PATTERN GENERALLY REMAINS UNCHANGED THROUGH THE EXTENDED WITH
RIDGE WEST AND TROUGH EAST. WEAK SHORT WAVE MOVING ACROSS THE RAREA
ON MONDAY WARRANT CHANCE POPS ACROSS THE BOARD. MIDLEVEL FLOW
FLATTER TUESDAY.  AIRMASS ALSO A LITTLE DRIER ON TUESDAY...SO
EXPECTED ONLY ISOLATED CONVECTION.

ANOTHER COLD FRONT WILL APPROACH THE AREA BY MID WEEK. SLGT CHANCE
POPS WARRANTED WEDNESDAY...AS MOISTURE WILL BE LIMITED. BY
THURSDAY...MOISTURE LEVELS IMPROVES SO WILL CARRY A CHANCE POPS FOR
THURSDAY THROUGH SATURDAY. CPW

.LWX...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.

Hazardous weather outlook, Jul 12, 12:30 PM EDT, 5 hours 34 minutes before

DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-025>031-036>042-
050>057-WVZ048>055-131030-

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1230 PM EDT SAT JUL 12 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE CHESAPEAKE
BAY AND EAST OF GARRETT COUNTY...THE DISTRICT OF COLUMBIA...NORTHERN
VIRGINIA...THE NORTHERN AND CENTRAL SHENANDOAH VALLEY...AND THE
EASTERN PANHANDLE OF WEST VIRGINIA.

.DAY ONE...TODAY
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS THE POTOMAC
HIGHLANDS LATE THIS AFTERNOON.

.DAYS TWO THROUGH SEVEN...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BECOME NECESSARY IN WESTERN MARYLAND AND
EASTERN WEST VIRGINIA LATER TODAY.

HTS

In the hours before

Special weather statement, Jul 12, 12:27 PM EDT, 5 hours 37 minutes before

MDZ002-003-VAZ021-WVZ048>052-054-055-122215-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1227 PM EDT SAT JUL 12 2003

THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA HAS INDICATED THAT
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON
AND EARLY THIS EVENING ACROSS THE POTOMAC HIGHLANDS.

AN UPPER LEVEL DISTURBANCE IN THE OHIO VALLEY HAS RESULTED IN
THUNDERSTORMS ACROSS WEST VIRGINIA AND SOUTHWEST PENNSYLVANIA LATE
THIS MORNING. THESE THUNDERSTORMS WILL MOVE TO THE EAST THIS
AFTERNOON. THUNDERSTORM ACTIVITY WILL RAPIDLY DIMINISH BY SUNSET.

LARGE HAIL...GREATER THAN THREE-QUARTERS OF AN INCH...WILL BE THE
PRIMARY THREAT...ALTHOUGH DAMAGING WIND GUSTS WILL ALSO BE POSSIBLE.

SKYWARN ACTIVATION MAY BECOME NECESSARY LATER TODAY.

STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR FURTHER
DETAILS OR UPDATES.

HTS

Special weather statement, Jul 12, 4:06 PM EDT, 1 hour 58 minutes before

MDZ002-003-WVZ048>051-055-122100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
406 PM EDT SAT JUL 12 2003

AT 4:06 PM...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 8
MILES WEST OF WOODLAND...MOVING EAST...SOUTHEAST AT 30 MPH. THIS
STORM WILL BE CAPABLE OF PRODUCING SMALL HAIL AND WIND GUSTS TO 50
MPH. THE COMMUNITIES OF CUMBERLAND...FROSTBURG...LA
VALE...LONACONING...WESTERNPORT...BAYARD...BERKELEY SPRINGS...FORT
ASHBY...KEYSER WILL BE AFFECTED BY THIS STORM THROUGH 5:00 PM.

THERE IS ALSO ANOTHER STORM EAST OF MORGANTOWN....WHICH WILL AFFECT
MAINLY MINERAL COUNTY AND POSSIBLE SOUTHERN ALLEGANY COUNTY AROUND
5:00 PM. THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL.

ROGOWSKI

Special weather statement, Jul 12, 4:40 PM EDT, 1 hour 24 minutes before

MDZ002-003-VAZ028-WVZ049>053-122145-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
440 PM EDT SAT JUL 12 2003

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA...HAS BEEN
RECEIVING NUMEROUS REPORTS OF HALF INCH SIZE HAIL WITH SEVERAL
THUNDERSTORMS THAT ARE OCCURRING IN THE FROSTBURG AND CUMBERLAND
AREAS. WE WILL CONTINUE TO MONITOR THESE STORMS...AND RESIDENTS
SHOULD REMAIN ALERT IN CASE A STORM BECOMES SEVERE AND WARNINGS
ARE ISSUED. WE APPRECIATE THE INFORMATION COMING IN FROM OUR
SPOTTERS.

THE SCATTERED THUNDERSTORMS WILL CONTINUE TO TRAVEL A CORRIDOR FROM
NEAR CUMBERLAND...EAST TO THE MARTINSBURG...AND HAGERSTOWN AREA
THROUGH 6:00 PM.

ROGOWSKI

Special weather statement, Jul 12, 5:03 PM EDT, 1 hour 1 minute before

DCZ001-MDZ009>011-013-014-122200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
503 PM EDT SAT JUL 12 2003

AT 503 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
KENSINGTON...MOVING EAST AT 15 MPH. THIS STORM WILL BE CAPABLE OF
PRODUCING SMALL HAIL AND WIND GUSTS TO 50 MPH. THE COMMUNITIES OF
BETHESDA...BROOKLYN PARK...CALVERTON...CHEVY
CHASE...COLESVILLE...COLLEGE PARK...FORT MEADE...GLEN
BURNIE...GREENBELT...HILLANDALE...LANGLEY
PARK...LAUREL...ODENTON...PUMPHREY...ROCKVILLE...SEVERNA
PARK...TAKOMA PARK AND WHITE OAK WILL BE AFFECTED BY THIS STORM
THROUGH 6:00 PM. RESIDENTS IN THESE AREAS SHOULD REMAIN ALERT IN
CASE WARNINGS ARE ISSUED.

ROGOWSKI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 6:00 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, City of Winchester	60 min
Jul 12, 6:30 PM EDT	Severe Thunderstorm Warning	LWX	Clarke	60 min
Jul 12, 7:27 PM EDT	Special Marine Warning	LWX		33 min
Jul 12, 7:30 PM EDT	Special Marine Warning	LWX		60 min
Jul 12, 7:57 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	63 min
Jul 12, 5:30 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	60 min
Jul 12, 6:33 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore	57 min
Jul 12, 6:55 PM EDT	Severe Thunderstorm Warning	LWX	Harford	65 min
Jul 12, 4:53 PM EDT	Severe Thunderstorm Warning	LWX	Mineral	52 min
Jul 12, 5:25 PM EDT	Severe Thunderstorm Warning	LWX	Hampshire	65 min
Jul 12, 6:17 PM EDT	Severe Thunderstorm Warning	LWX	Berkeley	58 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2003 Every severe thunderstorm warning in 2003

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.