Alert archive / Maryland / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 243, NWS Baltimore/Washington

August 9, 2007Saint Mary's County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Aug 9, 2007, 3:01 PM EDT for Saint Mary's County, Maryland. It was in force for 44 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
Aug 9, 2007, 3:01 PM EDT (19:01 UTC)
Expired
Aug 9, 2007, 3:45 PM EDT
In force
44 min
Issued by
NWS Baltimore/Washington
Area
Counties, with a storm outline in the text

County Saint Mary's County, MD

The radar

The Dover AFB radar (KDOX), 116 km from the middle of the area, began a volume at 19:02 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, 7.0 hours before the alert went out and 111 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 2007-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 547 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 2007-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.1939Sfc1 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
547 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
1213 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.4

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 Aug 9, 2:45 PM EDT, 16 minutes earlier.

Area forecast discussion, Aug 9, 2:45 PM EDT, 16 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
245 PM EDT THU AUG 9 2007

.SYNOPSIS...
A COLD FRONT WILL APPROACH THE AREA LATE TODAY AND TRACK EAST OF
THE REGION BY LATE FRIDAY. HIGH PRESSURE WILL BUILD OVER THE AREA
FOR THE WEEKEND. ANOTHER COLD FRONT WILL TRACK ACROSS THE AREA LATE
MONDAY INTO TUESDAY. HIGH PRESSURE WILL RETURN FOR MID WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...CAVEAT - WE ARE WORKING W/ A MINIMAL
SUMMER STAFF TDA...AND HV BEEN SPENDING THE BULK OF OUR DAY DEALING
W/ PTNL SVR WX ISSUES. NOT A LOT OF TIME HAS BEEN SPENT LOOKING AT
MDLS/CONTEMPLATING...SO MUCH OF THE AFTN PCKG WL BE A REISSUE OF THE
PRVS SHIFTS WORK.

WE HV BEEN IN DSCN W/ SPC REGARDING THE WTCH IN EFFECT TIL 20Z. THE
AREA OF TSTMS RESPONSIBLE FOR THIS WTCH IS MOVG E OF THE CWA...AND
AM PLANNING TO DROP THAT WTCH ERLY. THERE IS ANOTHER AREA OF STORMS OVR
WRN PA MOVG ESE...WHICH WL BE WATCHED AND COULD LEAD TO ANOTHER WTCH
IN THE COMING HRS.

BNDRY CONTS ACROSS THE CENTRAL PART OF THE CWA..WITH BULK OF CNVCTN
FIRING ON THE N SIDE OF IT. WL NOT BE SURPRISED TO SEE TSTMS/RASH
DVLPG DURG THE OVRNGT. IN SPITE OF A FALL IN TEMPS DURG ERLY AFTN
HRS..BLV MID ATLC IS IN STORE FOR ANOTHER WARM NGT...W/ TEMPS IN 70S
E OF THE HIGHLANDS.

&&

.SHORT TERM /FRIDAY/...MDLS SEEM IN AGREEMENT THAT A LOW WL FORM ON
THE BNDRY ERLY FRI AND TRACK E...DRAGGING MORE STABLE AIR INTO THE
RGN. WL RMV POPS IN THE W FOR THE AFTN HRS...AND PERHAPS THAT CAN BE
REDUCED FURTHER BY LATER SHIFTS. ALTHO NOT THE WARMTH OF WED..IT WL
STILL BE QUITE WARM..W/ TEMPS U80S/L90S MOST LOCALES.

&&

.LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/...SUB TROP RDG LOOKS TO
MIGRATE OVER THE 4 CRNR RGN NEXT WEEK...CAUSING SOME WK UPR TROFFING
IN THE ERN U.S. TEMPS STILL 85-90 FOR HIGHS. PERHAPS ANOTHER WV TO
BRING SOME PCPN TOWARDS THE END OF NEXT WK? BUT NO DROUGHT BUSTER IN
SIGHT.

&&

.AVIATION /18Z THURSDAY THROUGH TUESDAY/...

TERMINALS WL NEED TO CONT TO BE MONITORED FOR TSTMS RMDR OF AFTN
THRU FRI MRNG.

&&

.MARINE...TSTMS XPCTD IN WATERS THRU EVE HRS...PSBLY OVRNGT.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.
MARINE...NONE.

&&

ALL PRODUCTS - WOODY
Hazardous weather outlook, Aug 9, 10:39 AM EDT, 4 hours 22 minutes before
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In the hours before

Special weather statement, Aug 9, 1:11 PM EDT, 1 hour 50 minutes before
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Special weather statement, Aug 9, 1:16 PM EDT, 1 hour 45 minutes before
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Special weather statement, Aug 9, 1:17 PM EDT, 1 hour 44 minutes before
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Local storm report, Aug 9, 2:05 PM EDT, 56 minutes before
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Special weather statement, Aug 9, 2:20 PM EDT, 41 minutes before
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Special weather statement, Aug 9, 2:40 PM EDT, 21 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 12:16 PM EDTSpecial Marine WarningLWX119 min
Aug 9, 12:53 PM EDTSpecial Marine WarningLWX86 min
Aug 9, 1:19 PM EDTSevere Thunderstorm WarningLWXRappahannock41 min
Aug 9, 1:47 PM EDTSpecial Marine WarningLWX118 min
Aug 9, 1:47 PM EDTSevere Thunderstorm WarningLWXPage43 min
Aug 9, 2:12 PM EDTSevere Thunderstorm WarningLWXPrince William48 min
Aug 9, 2:28 PM EDTSevere Thunderstorm WarningLWXRockingham35 min
Aug 9, 2:53 PM EDTSevere Thunderstorm WarningLWXStafford67 min
Aug 9, 3:02 PM EDTSevere Thunderstorm WarningLWXPrince William28 min
Aug 9, 3:07 PM EDTSpecial Marine WarningLWX95 min
Aug 9, 4:26 PM EDTSevere Thunderstorm WarningLWXAlbemarle49 min
Aug 9, 5:04 PM EDTTornado WarningLWXAlbemarle20 min
Aug 9, 7:01 PM EDTSpecial Marine WarningLWX102 min
Aug 9, 10:47 AM EDTSevere Thunderstorm WarningLWXWashington73 min
Aug 9, 11:18 AM EDTSevere Thunderstorm WarningLWXCarroll, Frederick72 min
Aug 9, 3:16 PM EDTSevere Thunderstorm WarningLWXCharles44 min
Aug 9, 6:51 PM EDTSevere Thunderstorm WarningLWXCarroll, Frederick44 min
Aug 9, 6:11 PM EDTSevere Thunderstorm WarningLWXGrant64 min
Aug 9, 7:13 PM EDTSevere Thunderstorm WarningLWXHardy37 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2007Every severe thunderstorm warning in 2007

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.