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 Sep 28, 2021, 6:15 PM EDT for Chester County, Pennsylvania. It was in force for 45 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
- Sep 28, 2021, 6:15 PM EDT (22:15 UTC)
- Expired
- Sep 28, 2021, 7:00 PM EDT
- In force
- 45 min
- Issued by
- NWS Philadelphia/Mount Holly
- Hail
- 0.25 in
- Wind
- 30
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 110 km from the middle of the area, began a volume at 22:18 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, 10.3 hours before the alert went out and 199 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
- 35 J/kg
- Mixed-layer CIN
- -322 J/kg
- Mixed-layer LCL
- 1669 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
597
WWUS81 KPHI 282215
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
615 PM EDT Tue Sep 28 2021
PAZ060-101-102-282300-
Western Chester PA-Eastern Chester PA-Berks PA-
615 PM EDT Tue Sep 28 2021
...A strong thunderstorm will impact portions of south central Berks
and northeastern Chester Counties through 700 PM EDT...
At 614 PM EDT, Doppler radar was tracking a strong thunderstorm over
Elverson, or 11 miles southeast of Reading, moving southeast at 25
mph.
HAZARD...Pea size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to outdoor objects is possible.
Locations impacted include...
West Chester, Phoenixville, Downingtown, Birdsboro, Honey Brook,
Elverson, New Morgan, Glenmoore, Chester Springs, Pughtown,
Lionville, Marshallton, Lionville-Marchwood, Spring City, Exton,
Lorane and Thorndale.
This includes the following highways...
Pennsylvania Turnpike between mile markers 296 and 320.
Interstate 176 in Pennsylvania between mile markers 1 and 6.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4030 7586 4016 7552 4015 7552 4015 7550
4014 7551 4013 7550 4013 7546 3992 7565
4011 7593 4014 7588 4019 7595
TIME...MOT...LOC 2214Z 303DEG 21KT 4019 7584
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...<30 MPH
$$
POThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 28, 8:26 AM EDT | Areal Flood Advisory | PHI | Warren | 2 hr |
| Sep 28, 7:14 PM EDT | Special Weather Statement | PHI | Gloucester | 46 min |
| Sep 28, 7:29 PM EDT | Severe Thunderstorm Warning | PHI | Gloucester, Salem | 31 min |
| Sep 28, 9:23 AM EDT | Special Weather Statement | PHI | Montgomery | 37 min |
| Sep 28, 9:47 AM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 28 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.