Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

September 1, 2012Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 1, 2012, 7:29 PM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 61 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
Sep 1, 2012, 7:29 PM EDT (23:29 UTC)
Expired
Sep 1, 2012, 8:30 PM EDT
In force
61 min
Issued by
NWS Philadelphia/Mount Holly

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

The radar

The Dover AFB radar (KDOX), 71 km from the middle of the area, began a volume at 23:29 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, 11.5 hours before the alert went out and 101 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 2012-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1284 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 2012-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
1284 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
1119 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

575 
WWUS81 KPHI 012329
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
729 PM EDT SAT SEP 1 2012

MDZ012-015-019-020030-
KENT MD-QUEEN ANNE'S MD-TALBOT MD-
729 PM EDT SAT SEP 1 2012

...STRONG THUNDERSTORMS WILL AFFECT KENT...QUEEN ANNE'S AND TALBOT
COUNTIES...

AT 723 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 8 MILES NORTHEAST OF
BALTIMORE TO 25 MILES SOUTH OF BALTIMORE...MOVING SOUTHEAST AT 25
MPH. THE THUNDERSTORMS WILL BE NEAR ROMANCOKE...CHESTER AROUND 745
PM...TALBOT...OVERTON AROUND 800 PM...CHESTERTOWN...NEWTOWN AROUND
815 PM AND KINGSTOWN AROUND 830 PM.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. 
ANYONE WHO IS OUTDOORS THIS HOLIDAY WEEKEND SHOULD FIND SHELTER
IMMEDIATELY AT THE FIRST SIGN OF THREATENING WEATHER. DO NOT SEEK 
SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A 
THUNDERSTORM APPROACHES.

VERY HEAVY RAIN COULD FALL FROM THESE STORMS...AND WILL CAUSE WATER 
TO POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS. WIND GUSTS 
BETWEEN 30 AND 35 MPH ARE POSSIBLE WITH THESE STORMS, MOST LIKELY 
NEAR THE BAY


LAT...LON 3904 7632 3899 7627 3900 7618 3903 7625
      3917 7629 3934 7617 3934 7616 3930 7604
      3872 7602 3882 7632 3887 7625 3881 7621
      3882 7620 3893 7623 3894 7624 3890 7625
      3892 7628 3889 7627 3890 7632 3885 7639

$$

TFG

Nearby

Special Weather Statements in Maryland, 2012Every special weather statement in 2012

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.