Alert archive / Maryland / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

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

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 1, 2012, 8:47 PM EDT for Caroline County, Queen Anne's County, Maryland. It was in force for 88 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, 8:47 PM EDT (00:47 UTC)
Expired: Sep 1, 2012, 10:15 PM EDT
In force: 88 min
Issued by: NWS Philadelphia/Mount Holly

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

The radar

The Dover AFB radar (KDOX), 27 km from the middle of the area, began a volume at 00:47 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 0.8 hours before the alert went out and 114 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: 729 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1568 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 76 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.

692 
WWUS81 KPHI 020047
SPSPHI

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

DEZ002-003-MDZ015-019-020-020215-
CAROLINE MD-INLAND SUSSEX DE-KENT DE-QUEEN ANNE'S MD-TALBOT MD-
847 PM EDT SAT SEP 1 2012

...A STRONG THUNDERSTORM WILL AFFECT QUEEN ANNE'S COUNTY AND MAY 
AFFECT PARTS OF CAROLINE...KENT...SUSSEX AND TALBOT COUNTIES...

AT 842 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
STRONG THUNDERSTORM NEAR CENTREVILLE...MOVING SOUTHEAST AT 20 
MPH. THE THUNDERSTORM WILL BE NEAR STARR AROUND 845 
PM...JUMPTOWN...HILLSBORO AROUND 900 PM...RIDGELY...GREENSBORO 
AROUND 915 PM...DENTON AROUND 930 PM...ANDREWSVILLE AND SMITHVILLE 
AROUND 945 PM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO 
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS. FREQUENT CLOUD 
TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. DO NOT SEEK 
SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A 
THUNDERSTORM APPROACHES. SOME WIND GUSTS TO AROUND 30 MPH ARE
ALSO POSSIBLE.

LAT...LON 3893 7539 3862 7562 3897 7618 3914 7608

$$

TFG

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 2, 1:09 PM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	2 hr
Sep 2, 5:14 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth, Somerset	2 hr
Sep 2, 5:38 PM EDT	Areal Flood Advisory	PHI	Middlesex, Monmouth	3 hr
Sep 2, 7:37 PM EDT	Special Weather Statement	PHI	Monmouth	113 min
Sep 2, 12:25 AM EDT	Special Weather Statement	PHI	Sussex	95 min
Sep 2, 12:40 PM EDT	Areal Flood Advisory	PHI	New Castle	83 min
Sep 2, 3:00 PM EDT	Areal Flood Advisory	PHI	Sussex	2 hr
Sep 2, 3:38 PM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Sep 2, 4:51 PM EDT	Areal Flood Advisory	PHI	Sussex	89 min
Sep 1, 8:07 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Queen Anne's	38 min
Sep 1, 9:27 PM EDT	Special Weather Statement	PHI	Caroline, Queen Anne's, Talbot	93 min
Sep 1, 10:34 PM EDT	Special Weather Statement	PHI	Caroline, Talbot	86 min
Sep 1, 11:44 PM EDT	Special Weather Statement	PHI	Wicomico	61 min
Sep 2, 3:17 PM EDT	Areal Flood Advisory	PHI	Caroline	118 min
Sep 2, 3:57 PM EDT	Flash Flood Warning	PHI	Caroline	2 hr
Sep 2, 6:33 PM EDT	Special Weather Statement	PHI	Kent	117 min

Nearby

Special Weather Statements in Maryland, 2012 Every 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.