Alert archive / Pennsylvania / Special Weather Statements in 2011

Special Weather Statement, NWS Philadelphia/Mount Holly

June 22, 2011Delaware County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Jun 22, 2011, 2:57 AM EDT for Delaware County, Pennsylvania. It was in force for 63 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: Jun 22, 2011, 2:57 AM EDT (06:57 UTC)
Expired: Jun 22, 2011, 4:00 AM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly

County Delaware County, PA

The radar

The Philadelphia radar (KDIX), 97 km from the middle of the area, began a volume at 07:01 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, 7.0 hours before the alert went out and 186 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: 3316 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 856 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.6

Open this sounding in Storm Lab

The text

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

976 
WWUS81 KPHI 220657
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
257 AM EDT WED JUN 22 2011

DEZ001-MDZ008-NJZ016-017-PAZ067-070-220800-
CECIL MD-CHESTER PA-DELAWARE PA-GLOUCESTER NJ-NEW CASTLE DE-SALEM NJ-
257 AM EDT WED JUN 22 2011

...A STRONG THUNDERSTORM WILL AFFECT CECIL...CHESTER...DELAWARE...
GLOUCESTER...NEW CASTLE AND SALEM COUNTIES...

AT 256 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 8 MILES NORTH OF NEWARK...MOVING EAST AT 15 MPH.
THE THUNDERSTORM WILL BE NEAR ASHLAND...HOCKESSIN AROUND 315 AM...
ELSMERE...NEWPORT AROUND 330 AM...ARDEN...TALLEYVILLE AROUND 345
AM...LINWOOD AND BOOTHWYN AROUND 400 AM.

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

WIND GUSTS TO 40 MPH AND PEA TO DIME SIZED HAIL ARE POSSIBLE WITH 
THIS STORM.

EXPECT INTENSE LIGHTNING FROM THIS STORM. DO NOT SEEK SHELTER UNDER
TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES.

LAT...LON 3999 7531 3969 7524 3967 7551 3969 7552
      3967 7554 3965 7586 3992 7589

$$

HAYES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 3:31 AM EDT	Special Marine Warning	PHI		59 min
Jun 22, 8:39 AM EDT	Special Weather Statement	PHI	Morris, Sussex	36 min
Jun 22, 9:31 AM EDT	Special Weather Statement	PHI	Morris, Sussex	44 min
Jun 22, 3:07 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Ocean	53 min
Jun 22, 3:59 PM EDT	Special Weather Statement	PHI	Mercer	61 min
Jun 22, 3:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	61 min
Jun 22, 4:06 PM EDT	Special Marine Warning	PHI		84 min
Jun 22, 4:09 PM EDT	Special Weather Statement	PHI	Sussex	66 min
Jun 22, 4:17 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	58 min
Jun 22, 4:37 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Sussex, Warren	53 min
Jun 22, 4:39 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Middlesex, Monmouth, Ocean, Somerset	66 min
Jun 22, 4:53 PM EDT	Tornado Warning	PHI	Sussex, Warren	37 min
Jun 22, 5:11 PM EDT	Tornado Warning	PHI	Hunterdon, Morris, Sussex, Warren	34 min
Jun 22, 5:31 PM EDT	Tornado Warning	PHI	Monmouth, Ocean	29 min
Jun 22, 5:43 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	48 min
Jun 21, 9:37 PM EDT	Areal Flood Advisory	PHI	Monroe	116 min
Jun 22, 2:15 AM EDT	Special Weather Statement	PHI	Berks, Chester, Delaware	60 min
Jun 22, 3:05 AM EDT	Areal Flood Advisory	PHI	Chester, Delaware	115 min
Jun 22, 4:13 AM EDT	Special Weather Statement	PHI	Carbon	92 min
Jun 22, 6:32 AM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	58 min
Jun 22, 8:00 AM EDT	Special Weather Statement	PHI	Delaware, Philadelphia	60 min
Jun 22, 1:48 PM EDT	Special Weather Statement	PHI	Berks	57 min
Jun 22, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	67 min
Jun 21, 11:57 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	63 min
Jun 22, 12:40 AM EDT	Special Weather Statement	PHI	Caroline	65 min
Jun 22, 12:55 AM EDT	Special Weather Statement	PHI	Cecil	65 min
Jun 22, 1:05 AM EDT	Severe Thunderstorm Warning	PHI	Caroline, Queen Anne's, Talbot	55 min
Jun 22, 1:29 AM EDT	Special Weather Statement	PHI	Cecil	61 min
Jun 22, 1:47 AM EDT	Areal Flood Advisory	PHI	Caroline, Talbot	105 min
Jun 22, 2:02 AM EDT	Special Weather Statement	PHI	Caroline	58 min
Jun 22, 1:43 AM EDT	Special Weather Statement	PHI	Kent	62 min
Jun 22, 2:31 AM EDT	Areal Flood Advisory	PHI	Sussex	119 min
Jun 22, 12:18 PM EDT	Special Weather Statement	PHI	Sussex	57 min

Nearby

Special Weather Statements in Pennsylvania, 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.