Alert archive / Pennsylvania / Special Weather Statements in 2012

Special Weather Statement, NWS Philadelphia/Mount Holly

August 1, 2012Chester County, Pennsylvania; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 1, 2012, 1:02 AM EDT for Chester County, Pennsylvania; New Castle 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 1, 2012, 1:02 AM EDT (05:02 UTC)
Expired: Aug 1, 2012, 2:00 AM EDT
In force: 58 min
Issued by: NWS Philadelphia/Mount Holly

Counties New Castle County, DE, Chester County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 5.0 hours before the alert went out and 168 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: 250 J/kg
Mixed-layer CIN: -77 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

321 
WWUS81 KPHI 010502
SPSPHI

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
102 AM EDT WED AUG 1 2012

DEZ001-MDZ008-PAZ067-010600-
CECIL MD-CHESTER PA-NEW CASTLE DE-
102 AM EDT WED AUG 1 2012

...SHOWERS AND THUNDERSTORMS WILL AFFECT CECIL...CHESTER AND NEW 
CASTLE COUNTIES...

AT 1253 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
SHOWERS AND THUNDERSTORMS 6 MILES WEST OF ELKTON...MOVING 
NORTHEAST AT 25 MPH. THE THUNDERSTORM WILL BE NEAR BLAKE AROUND 100 
AM...CHERRY HILL...APPLETON AROUND 115 AM...NORTH STAR...PIKE CREEK 
AROUND 130 AM...ASHLAND...HOCKESSIN AROUND 145 AM AND MARSHALLTON 
AROUND 200 AM.

VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL POOR DRAINAGE AREAS.

OCCASIONAL CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. DO
NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS
WHEN A THUNDERSTORM APPROACHES.

LAT...LON 3979 7605 3983 7602 3985 7603 3988 7600
      3996 7600 4005 7594 4015 7580 3989 7557
      3987 7560 3984 7558 3984 7553 3979 7548
      3945 7572 3973 7611

$$

ROBERTSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 9:51 PM EDT	Coastal Flood Statement	PHI	Burlington, Camden, Gloucester	5 hr
Aug 1, 9:24 AM EDT	Coastal Flood Advisory	PHI	Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 1 more	15 hr
Aug 1, 9:44 AM EDT	Areal Flood Advisory	PHI	Cumberland	2 hr
Aug 1, 10:48 AM EDT	Special Weather Statement	PHI	Cumberland	57 min
Aug 1, 10:59 AM EDT	Areal Flood Advisory	PHI	Cumberland	73 min
Aug 1, 12:09 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	3 hr
Aug 1, 12:48 PM EDT	Areal Flood Advisory	PHI	Cape May	107 min
Aug 1, 1:09 PM EDT	Special Weather Statement	PHI	Cape May	66 min
Aug 1, 1:16 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Ocean	3 hr
Aug 1, 1:45 PM EDT	Special Weather Statement	PHI	Somerset	60 min
Aug 1, 2:12 PM EDT	Areal Flood Advisory	PHI	Middlesex, Morris, Somerset	3 hr
Aug 1, 2:27 PM EDT	Special Weather Statement	PHI	Hunterdon, Mercer	63 min
Aug 1, 2:39 PM EDT	Flash Flood Warning	PHI	Middlesex, Somerset	3 hr
Aug 1, 2:47 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer	3 hr
Aug 1, 2:57 PM EDT	Special Weather Statement	PHI	Ocean	63 min
Aug 1, 3:12 PM EDT	Special Weather Statement	PHI	Hunterdon	63 min
Aug 1, 3:25 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset	3 hr
Aug 1, 3:31 PM EDT	Coastal Flood Statement	PHI	Burlington, Camden, Gloucester, Salem	11 hr
Aug 1, 3:51 PM EDT	Flash Flood Warning	PHI	Hunterdon, Morris	2 hr
Aug 1, 4:11 PM EDT	Areal Flood Advisory	PHI	Burlington, Ocean	65 min
Aug 1, 4:41 PM EDT	Special Weather Statement	PHI	Sussex	64 min
Aug 1, 5:26 PM EDT	Areal Flood Advisory	PHI	Sussex	102 min
Aug 1, 5:41 PM EDT	Special Weather Statement	PHI	Camden, Gloucester	64 min
Aug 1, 5:46 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	31 min
Aug 1, 6:16 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	46 min
Jul 31, 8:11 PM EDT	Special Weather Statement	PHI	Berks	64 min
Jul 31, 9:12 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	63 min
Aug 1, 2:03 PM EDT	Special Weather Statement	PHI	Chester	57 min
Aug 1, 3:03 PM EDT	Special Weather Statement	PHI	Monroe	57 min
Aug 1, 3:35 PM EDT	Special Weather Statement	PHI	Philadelphia	55 min
Aug 1, 4:07 PM EDT	Flash Flood Warning	PHI	Bucks, Montgomery	3 hr
Aug 1, 4:16 PM EDT	Special Weather Statement	PHI	Carbon, Monroe	59 min
Aug 1, 4:51 PM EDT	Areal Flood Advisory	PHI	Monroe	36 min
Aug 1, 4:53 PM EDT	Special Weather Statement	PHI	Philadelphia	67 min
Aug 1, 5:06 PM EDT	Areal Flood Advisory	PHI	Montgomery, Philadelphia	12 min
Aug 1, 5:09 PM EDT	Flash Flood Warning	PHI	Montgomery, Philadelphia	3 hr
Aug 1, 5:22 PM EDT	Flash Flood Warning	PHI	Monroe	106 min
Aug 1, 5:34 PM EDT	Special Weather Statement	PHI	Carbon	56 min
Aug 1, 5:43 PM EDT	Special Weather Statement	PHI	Delaware, Montgomery	62 min
Aug 1, 5:50 PM EDT	Special Weather Statement	PHI	Montgomery	55 min
Aug 1, 5:53 PM EDT	Areal Flood Advisory	PHI	Carbon, Monroe	100 min
Aug 1, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Monroe, Northampton	65 min
Aug 1, 6:08 PM EDT	Flash Flood Warning	PHI	Chester, Montgomery	2 hr
Aug 1, 6:22 PM EDT	Special Weather Statement	PHI	Lehigh	53 min
Aug 1, 6:30 PM EDT	Areal Flood Advisory	PHI	Chester, Delaware	64 min
Aug 1, 6:53 PM EDT	Areal Flood Advisory	PHI	Lehigh, Northampton	69 min
Aug 1, 6:59 PM EDT	Special Weather Statement	PHI	Northampton	61 min
Aug 1, 7:32 PM EDT	Special Weather Statement	PHI	Chester	58 min
Aug 1, 7:49 PM EDT	Areal Flood Advisory	PHI	Chester	52 min
Aug 1, 1:18 PM EDT	Special Weather Statement	PHI	Sussex	57 min
Aug 1, 1:43 PM EDT	Areal Flood Advisory	PHI	Kent, New Castle	86 min
Aug 1, 1:55 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	2 hr
Aug 1, 12:13 AM EDT	Special Weather Statement	PHI	Cecil, Kent, Queen Anne's	47 min
Aug 1, 1:11 AM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	64 min
Aug 1, 1:17 PM EDT	Special Weather Statement	PHI	Queen Anne's	58 min

Nearby

Special Weather Statements in Pennsylvania, 2012 Special Weather Statements in Delaware, 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.