Alert archive / Maryland / Special Weather Statements in 2010

Special Weather Statement, NWS Philadelphia/Mount Holly

August 4, 2010Caroline County, Maryland; Kent County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 4, 2010, 6:17 AM EDT for Caroline County, Maryland; Kent County, Delaware. It was in force for 58 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 4, 2010, 6:17 AM EDT (10:17 UTC)
Expired: Aug 4, 2010, 7:15 AM EDT
In force: 58 min
Issued by: NWS Philadelphia/Mount Holly

Counties Kent County, DE, Caroline County, MD

The radar

The Dover AFB radar (KDOX), 59 km from the middle of the area, began a volume at 10:17 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, 10.3 hours before the alert went out and 157 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 811 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 842 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

192 
WWUS81 KPHI 041017
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
617 AM EDT WED AUG 4 2010

DEZ001>003-MDZ008-012-015-019-020-NJZ016-021-041115-
CAROLINE MD-CECIL MD-CUMBERLAND NJ-INLAND SUSSEX DE-KENT MD-KENT DE-
NEW CASTLE DE-QUEEN ANNE'S MD-SALEM NJ-TALBOT MD-
617 AM EDT WED AUG 4 2010

...SHOWERS AND THUNDERSTORMS WILL AFFECT CAROLINE...CECIL... 
CUMBERLAND...KENT...NEW CASTLE...QUEEN ANNE'S...SALEM...SUSSEX AND 
TALBOT COUNTIES...

AT 611 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SHOWERS AND THUNDERSTORMS ALONG A LINE EXTENDING FROM 18 MILES NORTH 
OF CENTERVILLE TO 6 MILES NORTHEAST OF CENTERVILLE TO 9 MILES 
NORTHEAST OF EASTON...MOVING EAST AT 20 MPH. THE THUNDERSTORMS WILL 
BE NEAR HARMONY...CRUMPTON AROUND 630 AM...MASSEY...GALENA AROUND 
645 AM...DELANEY CORNER...SASSAFRAS AROUND 700 AM...FARMINGTON AND 
HARRINGTON AROUND 715 AM.

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

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS.

LAT...LON 3941 7604 3942 7602 3945 7600 3946 7557
      3941 7552 3943 7550 3946 7554 3946 7541
      3937 7541 3939 7545 3943 7548 3940 7552
      3927 7541 3878 7540 3877 7603

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 2:56 PM EDT	Heat Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 9 more	29 hr

Nearby

Special Weather Statements in Maryland, 2010 Special Weather Statements in Delaware, 2010 Every special weather statement in 2010

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.