Alert archive / Maryland / Severe Thunderstorm Watches in 2003

Severe Thunderstorm Watch 905

August 27, 20034 states

The Storm Prediction Center issued this severe thunderstorm watch at Aug 27, 2003, 7:30 PM EDT for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Aug 27, 2003, 7:30 PM EDT (23:30 UTC)
Expired
Aug 27, 2003, 11:00 PM EDT
In force
4 hr
Issued by
the Storm Prediction Center

Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Dorchester County, MD, Kent County, MD, Queen Anne's County, MD, Somerset County, MD, Talbot County, MD, Wicomico County, MD, Worcester County, MD, Atlantic County, NJ, Cape May County, NJ, Cumberland County, NJ, Salem County, NJ, Northumberland County, VA

Warnings issued inside it

2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Aug 27, 7:30 PM EDTSevere Thunderstorm WarningPHIKent, Queen Anne's45 min
Aug 27, 7:53 PM EDTSevere Thunderstorm WarningPHICaroline37 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.5 hours before the alert went out and 154 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 2003-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 483 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 2003-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.193958Sfc1 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
483 J/kg
Mixed-layer CIN
-236 J/kg
Mixed-layer LCL
1264 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
66 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

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 27, 9:23 AM EDTMesoscale DiscussionSPCKent, Sussex2 hr
Aug 27, 6:56 PM EDTMesoscale DiscussionSPCKent, New Castle, Sussex64 min
Aug 26, 9:20 PM EDTSevere Thunderstorm WatchSPCAllegany, Garrett6 hr
Aug 26, 10:18 PM EDTMesoscale DiscussionSPCAllegany, Garrett57 min
Aug 27, 12:22 AM EDTMesoscale DiscussionSPCCharles53 min
Aug 27, 6:11 AM EDTMesoscale DiscussionSPCAllegany, Garrett, Washington2 hr
Aug 27, 9:40 AM EDTSevere Thunderstorm WatchSPCHarford5 hr
Aug 27, 10:35 AM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more5 hr
Aug 27, 2:10 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 8 more65 min
Aug 27, 3:09 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Frederick and 7 more66 min
Aug 27, 3:30 PM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 9 more7 hr
Aug 27, 5:03 PM EDTMesoscale DiscussionSPCAllegany, Anne Arundel, Baltimore, Calvert, Carroll, Charles and 10 more87 min

Nearby

Severe Thunderstorm Watches in Maryland, 2003Severe Thunderstorm Watches in New Jersey, 2003Severe Thunderstorm Watches in Delaware, 2003Every severe thunderstorm watch 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.