Alert archive / Maryland / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

April 3, 2011Caroline County, Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Apr 3, 2011, 11:09 PM EDT for Caroline County, Kent County, Queen Anne's County, Maryland. It was in force for 66 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
Apr 3, 2011, 11:09 PM EDT (03:09 UTC)
Expired
Apr 4, 2011, 12:15 AM EDT
In force
66 min
Issued by
NWS Philadelphia/Mount Holly

Counties Caroline County, MD, Kent County, MD, Queen Anne's County, MD

The radar

The Dover AFB radar (KDOX), 69 km from the middle of the area, began a volume at 03:12 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 00:00Z, 3.2 hours before the alert went out and 102 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 2011-04-04Temperature 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°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 2011-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 square meters per square second.1939587897Sfc1 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
2222 m above ground
0-6 km bulk shear
80 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
519 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.

590 
WWUS81 KPHI 040309
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1109 PM EDT SUN APR 3 2011

DEZ002-MDZ012-015-019-020-040415-
CAROLINE MD-KENT MD-KENT DE-QUEEN ANNE'S MD-TALBOT MD-
1109 PM EDT SUN APR 3 2011

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT CAROLINE...KENT... 
QUEEN ANNE'S AND TALBOT COUNTIES...

AT 1104 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
CLUSTER OF STRONG THUNDERSTORMS 18 MILES WEST OF BALTIMORE...MOVING 
EAST AT 35 MPH. THE THUNDERSTORMS WILL BE NEAR ROCK HALL... 
STEVENSVILLE AROUND MIDNIGHT...OLD TOWN AND CENTREVILLE AROUND 1215 
AM.

EXPECT SMALL HAIL AND FREQUENT CLOUD TO GROUND LIGHTNING FROM THESE 
STORMS.

LAT...LON 3905 7631 3900 7627 3900 7618 3903 7625
      3910 7624 3915 7628 3930 7619 3920 7565
      3873 7579 3882 7620 3886 7624 3889 7621
      3894 7624 3890 7624 3893 7628 3890 7629
      3890 7633 3886 7634 3887 7638 3894 7637

$$

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 4, 4:07 AM EDTGale WarningPHI35 hr
Apr 4, 2:15 PM EDTRed Flag WarningPHIBurlington, Camden, Ocean4 hr
Apr 4, 3:24 PM EDTWind AdvisoryPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 3 more22 hr
Apr 3, 10:29 PM EDTSpecial Weather StatementPHICaroline, Kent, Queen Anne's61 min

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; radar from the NEXRAD Level II archive.