Alert archive / Pennsylvania / Special Weather Statements in 2021
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Aug 13, 2021, 5:31 PM EDT for Chester County, Pennsylvania. It was in force for 44 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 13, 2021, 5:31 PM EDT (21:31 UTC)
- Expired
- Aug 13, 2021, 6:15 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Hail
- 0.00 in
- Wind
- 40
County Chester County, PA
The radar
The Dover AFB radar (KDOX), 119 km from the middle of the area, began a volume at 21:33 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 12:00Z, 9.5 hours before the alert went out and 152 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
- 313 J/kg
- Mixed-layer CIN
- -199 J/kg
- Mixed-layer LCL
- 1675 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
531
WWUS81 KPHI 132131
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
531 PM EDT Fri Aug 13 2021
PAZ101-102-132215-
Western Chester PA-Eastern Chester PA-
531 PM EDT Fri Aug 13 2021
...A strong thunderstorm will impact portions of southwestern Chester
County through 615 PM EDT...
At 530 PM EDT, Doppler radar was tracking a strong thunderstorm near
Delta, or 14 miles south of Willow Street, moving east at 35 mph.
HAZARD...Winds in excess of 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Oxford, West Grove, Homeville, Glen Roy, Mount Vernon, Cochranville,
Kemblesville and Avondale.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
southeastern Pennsylvania.
&&
LAT...LON 3974 7612 3973 7610 3974 7610 3976 7606
3981 7603 3983 7604 3983 7602 3987 7601
3987 7599 3991 7599 3994 7577 3972 7578
3972 7613
TIME...MOT...LOC 2130Z 269DEG 29KT 3977 7632
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 11:49 PM EDT | Special Weather Statement | PHI | Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren | 56 min |
| Aug 13, 7:32 PM EDT | Special Marine Warning | PHI | 88 min | |
| Aug 12, 10:27 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon | 48 min |
| Aug 12, 11:20 PM EDT | Special Weather Statement | PHI | Carbon, Lehigh, Northampton | 40 min |
| Aug 13, 3:21 PM EDT | Special Weather Statement | PHI | Sussex | 24 min |
| Aug 13, 6:04 PM EDT | Special Weather Statement | PHI | Sussex | 26 min |
| Aug 13, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Kent | 30 min |
| Aug 13, 6:47 PM EDT | Special Weather Statement | PHI | Sussex | 43 min |
| Aug 13, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 37 min |
| Aug 13, 7:12 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 33 min |
| Aug 13, 7:30 PM EDT | Special Weather Statement | PHI | Sussex | 45 min |
| Aug 13, 7:43 PM EDT | Severe Thunderstorm Warning | PHI | Kent, Sussex | 47 min |
| Aug 13, 7:57 PM EDT | Areal Flood Advisory | PHI | Kent, Sussex | 93 min |
| Aug 13, 6:02 PM EDT | Special Weather Statement | PHI | Kent, Queen Anne's | 58 min |
| Aug 13, 6:29 PM EDT | Special Weather Statement | PHI | Caroline | 31 min |
| Aug 13, 6:29 PM EDT | Severe Thunderstorm Warning | PHI | Queen Anne's, Talbot | 25 min |
Nearby
Special Weather Statements in Pennsylvania, 2021Every special weather statement in 2021
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.