Alert archive / Pennsylvania / Special Weather Statements in 2011
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Jun 28, 2011, 9:36 PM EDT for Delaware County, Pennsylvania. 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
- Jun 28, 2011, 9:36 PM EDT (01:36 UTC)
- Expired
- Jun 28, 2011, 10:30 PM EDT
- In force
- 54 min
- Issued by
- NWS Philadelphia/Mount Holly
County Delaware County, PA
The radar
The Dover AFB radar (KDOX), 117 km from the middle of the area, began a volume at 01:37 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, 1.6 hours before the alert went out and 169 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.
- Mixed-layer CAPE
- 256 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1187 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
169
WWUS81 KPHI 290136
SPSPHI
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
936 PM EDT TUE JUN 28 2011
DEZ001-PAZ067-070-290230-
CHESTER PA-DELAWARE PA-NEW CASTLE DE-
936 PM EDT TUE JUN 28 2011
...A STRONG THUNDERSTORM WILL AFFECT CHESTER...DELAWARE AND NEW
CASTLE COUNTIES...
AT 936 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 13 MILES NORTHWEST OF NEWARK...MOVING EAST AT 25
TO 30 MPH. THE THUNDERSTORM WILL BE NEAR WEST GROVE...TOUGHKENAMON
AROUND 945 PM...KENNETT SQUARE...MARSHALLTON AROUND 1000 PM...
CHEYNEY...GRADYVILLE AROUND 1015 PM...UPPER PROVIDENCE TOWNSHIP AND
LIMA AROUND 1030 PM.
VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE WATER TO
POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS.
GUSTY WINDS AND SMALL HAIL ARE ALSO POSSIBLE WITH THIS STORM ALONG
WITH DANGEROUS CLOUD TO GROUND LIGHTNING.
LAT...LON 3977 7609 3978 7607 3985 7603 3988 7600
4008 7542 3993 7527 3982 7541 3980 7562
3972 7610
$$
RPWThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 29, 12:48 AM EDT | Special Weather Statement | PHI | Sussex, Warren | 87 min |
| Jun 29, 1:02 AM EDT | Special Weather Statement | PHI | Atlantic | 58 min |
| Jun 29, 2:09 AM EDT | Special Weather Statement | PHI | Monmouth, Ocean | 96 min |
| Jun 29, 2:15 AM EDT | Special Marine Warning | PHI | 60 min | |
| Jun 28, 8:31 PM EDT | Special Weather Statement | PHI | Montgomery | 44 min |
| Jun 28, 8:36 PM EDT | Special Weather Statement | PHI | Berks | 39 min |
| Jun 28, 9:57 PM EDT | Special Weather Statement | PHI | Carbon, Lehigh, Monroe, Northampton | 93 min |
| Jun 28, 9:05 PM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 55 min |
Nearby
Special Weather Statements in Pennsylvania, 2011Every 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.