Alert archive / Maryland / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2011Kent County, Queen Anne's County, Maryland

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2011, 5:13 PM EDT for Kent County, Queen Anne's County, Maryland. It was in force for 62 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 9, 2011, 5:13 PM EDT (21:13 UTC)
Expired: Aug 9, 2011, 6:15 PM EDT
In force: 62 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 21:13 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, 9.2 hours before the alert went out and 54 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: 210 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1178 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

492 
WWUS81 KPHI 092113
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
513 PM EDT TUE AUG 9 2011

MDZ012-015-092215-
KENT MD-QUEEN ANNE'S MD-
513 PM EDT TUE AUG 9 2011

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

AT 509 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
STRONG THUNDERSTORMS APPROACHING CHESAPEAKE BAY SOUTHEAST OF 
BALTIMORE...MOVING SOUTHEAST AT 25 MPH. THE THUNDERSTORM WILL BE 
NEAR STEVENSVILLE SOUTH...CHESTER AROUND 530 PM...GRASONVILLE AND 
QUEENSTOWN AROUND 545 PM.

WIND GUSTS TO 50 MPH ARE POSSIBLE WITH THIS STORM.

LAT...LON 3894 7637 3903 7633 3905 7629 3901 7629
      3899 7624 3900 7618 3903 7625 3910 7624
      3915 7628 3926 7619 3932 7587 3895 7605
      3895 7609 3885 7618 3886 7622 3893 7621
      3894 7624 3890 7624 3893 7628 3884 7638

$$

FORECASTER: NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 12:18 PM EDT	Severe Thunderstorm Warning	PHI	Gloucester	57 min
Aug 9, 12:32 PM EDT	Tornado Warning	PHI	Gloucester	28 min
Aug 9, 1:02 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	58 min
Aug 9, 1:08 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	67 min
Aug 9, 1:17 PM EDT	Special Weather Statement	PHI	Burlington, Camden, Gloucester	58 min
Aug 9, 2:16 PM EDT	Special Weather Statement	PHI	Atlantic	59 min
Aug 9, 2:22 PM EDT	Areal Flood Advisory	PHI	Camden, Cumberland, Gloucester, Salem	3 hr
Aug 9, 2:22 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Monmouth	53 min
Aug 9, 2:53 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	3 hr
Aug 9, 3:27 PM EDT	Special Weather Statement	PHI	Atlantic	63 min
Aug 9, 4:13 PM EDT	Special Marine Warning	PHI		92 min
Aug 9, 5:48 PM EDT	Special Weather Statement	PHI	Gloucester	87 min
Aug 9, 6:54 PM EDT	Special Weather Statement	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	81 min
Aug 9, 11:46 AM EDT	Special Weather Statement	PHI	Chester, Delaware, Montgomery	59 min
Aug 9, 12:40 PM EDT	Special Weather Statement	PHI	Cecil	65 min
Aug 9, 6:35 PM EDT	Special Weather Statement	PHI	Talbot	85 min

Nearby

Special Weather Statements in Maryland, 2011 Every 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.