Alert archive / Maryland / Special Weather Statements in 2013

Special Weather Statement, NWS Philadelphia/Mount Holly

September 12, 2013Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 12, 2013, 2:21 PM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 54 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 12, 2013, 2:21 PM EDT (18:21 UTC)
Expired: Sep 12, 2013, 3:15 PM EDT
In force: 54 min
Issued by: NWS Philadelphia/Mount Holly

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

The radar

The Dover AFB radar (KDOX), 75 km from the middle of the area, began a volume at 18:23 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.4 hours before the alert went out and 36 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: 1009 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 970 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 39 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.

881 
WWUS81 KPHI 121821
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
221 PM EDT THU SEP 12 2013

MDZ012-015-121915-
KENT MD-QUEEN ANNE'S MD-
221 PM EDT THU SEP 12 2013

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL QUEEN ANNE'S AND
SOUTHERN KENT COUNTIES...

AT 219 PM EDT...A STRONG THUNDERSTORM WAS 6 MILES NORTHWEST OF ROCK
HALL...MOVING EAST AT 20 MPH.

WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THIS STORM. 

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN CAN CAUSE RAPID
RISES ON SMALL STREAMS AND CREEKS. 

THIS STORM WILL BE NEAR ROCK HALL AROUND 240 PM...LANGFORD AROUND 250
PM...OLD TOWN AROUND 300 PM...STARKEY CORNER AROUND 310 PM AND CHURCH
HILL AROUND 320 PM.

LAT...LON 3917 7627 3918 7628 3928 7621 3927 7589
      3899 7601 3905 7624 3913 7626 3914 7629
      3917 7629

$$

FORECASTER: HEAVENER

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 6:43 AM EDT	Special Weather Statement	PHI	Hunterdon	62 min
Sep 12, 7:38 AM EDT	Areal Flood Advisory	PHI	Hunterdon	3 hr
Sep 12, 8:16 AM EDT	Flash Flood Warning	PHI	Hunterdon	3 hr
Sep 12, 11:15 AM EDT	Special Weather Statement	PHI	Hunterdon, Morris, Somerset	60 min
Sep 12, 11:35 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Somerset	55 min
Sep 12, 1:19 PM EDT	Special Weather Statement	PHI	Monmouth	56 min
Sep 12, 3:13 PM EDT	Special Weather Statement	PHI	Monmouth	62 min
Sep 12, 5:38 PM EDT	Small Craft Advisory	PHI		7 hr
Sep 12, 6:00 PM EDT	Special Weather Statement	PHI	Morris, Sussex, Warren	90 min
Sep 12, 6:07 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	68 min
Sep 12, 6:35 PM EDT	Special Weather Statement	PHI	Middlesex	55 min
Sep 12, 6:43 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Somerset	62 min
Sep 12, 7:28 PM EDT	Special Weather Statement	PHI	Burlington, Middlesex, Monmouth	62 min
Sep 12, 2:26 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	64 min
Sep 12, 3:43 PM EDT	Special Weather Statement	PHI	Berks	62 min
Sep 12, 4:21 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	84 min
Sep 12, 4:40 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Lehigh, Monroe, Montgomery and 1 more	95 min
Sep 12, 5:47 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	58 min
Sep 12, 6:40 PM EDT	Special Weather Statement	PHI	Kent	65 min
Sep 12, 7:26 PM EDT	Special Weather Statement	PHI	Sussex	64 min
Sep 12, 5:58 PM EDT	Special Weather Statement	PHI	Queen Anne's, Talbot	62 min
Sep 12, 6:21 PM EDT	Severe Thunderstorm Warning	PHI	Talbot	39 min

Nearby

Special Weather Statements in Maryland, 2013 Every special weather statement in 2013

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.