Alert archive / Maryland / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

August 1, 2011Kent County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 1, 2011, 10:16 PM EDT for Kent County, Maryland. It was in force for 89 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 1, 2011, 10:16 PM EDT (02:16 UTC)
Expired
Aug 1, 2011, 11:45 PM EDT
In force
89 min
Issued by
NWS Philadelphia/Mount Holly

County Kent County, MD

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 2.3 hours before the alert went out and 134 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 00:00Z on 2011-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 644 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 00:00Z on 2011-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
644 J/kg
Mixed-layer CIN
-121 J/kg
Mixed-layer LCL
1789 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

522 
WWUS81 KPHI 020216
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1016 PM EDT MON AUG 1 2011

DEZ001-002-MDZ008-012-015-020-020345-
CAROLINE MD-CECIL MD-KENT MD-KENT DE-NEW CASTLE DE-QUEEN ANNE'S MD-
1016 PM EDT MON AUG 1 2011

...A PAIR OF STRONG THUNDERSTORMS WILL AFFECT 
CAROLINE...CECIL...KENT...NEW CASTLE AND QUEEN ANNE'S COUNTIES...

AT 1013 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 12 MILES SOUTHWEST OF ELKTON...MOVING SOUTHEAST
AT 20 MPH. THE THUNDERSTORM WILL BE NEAR CECILTON...CAYOTS AROUND
1030 PM...SASSAFRAS...WARWICK AROUND 1045 PM...TOWNSEND...MASSEY
AROUND 1100 PM...GREEN SPRING...DELANEY CORNER AROUND 1115 
PM...CLAYTON AND SMYRNA AROUND 1130 PM. ANOTHER STRONG THUNDERSTORM
WAS OVER NORTHERN KENT COUNTY MARYLAND NEAR BETTERTON AND IT TOO
WAS MOVING TO THE SOUTHEAST.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.

WIND GUSTS TO AROUND 45 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS 
STORM.

EXPECT FREQUENT LIGHTNING FROM THE STORMS. DO NOT SEEK SHELTER UNDER
TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.

LAT...LON 3938 7609 3938 7607 3944 7600 3946 7602
      3947 7601 3950 7601 3951 7599 3953 7600
      3956 7598 3934 7546 3900 7575 3935 7611

$$

TFG

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 1, 8:04 PM EDTSpecial Marine WarningPHI86 min
Aug 1, 9:29 PM EDTSpecial Weather StatementPHICaroline, Cecil, Kent, Queen Anne's, Talbot2 hr

Nearby

Special Weather Statements in Maryland, 2011Every special weather statement in 2011

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.