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 Apr 10, 2021, 2:34 AM EDT for Chester County, Pennsylvania. It was in force for 41 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
- Apr 10, 2021, 2:34 AM EDT (06:34 UTC)
- Expired
- Apr 10, 2021, 3:15 AM EDT
- In force
- 41 min
- Issued by
- NWS Philadelphia/Mount Holly
County Chester County, PA
The radar
The Dover AFB radar (KDOX), 113 km from the middle of the area, began a volume at 06:37 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, 6.6 hours before the alert went out and 172 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 537 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 161 m²/s²
- 0-3 km storm-relative helicity
- 238 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
486
WWUS81 KPHI 100634
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
234 AM EDT Sat Apr 10 2021
DEZ001-PAZ102-100715-
New Castle-Eastern Chester-
234 AM EDT Sat Apr 10 2021
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN NEW CASTLE AND
SOUTH CENTRAL CHESTER COUNTIES...
At 233 AM EDT, a strong thunderstorm was located over Ladenberg, or 7
miles north of Newark, moving east at 10 mph.
Wind gusts up to 30 mph are possible with this storm.
Locations impacted include...
Wilmington, Newark, Elsmere, Kennett Square, West Grove, Newport,
Greenville, Stanton, North Star, Ladenberg, Pike Creek, Kemblesville,
Hockessin, Ashland, Wilmington Manor, Avondale, Toughkenamon and
Brookside.
This includes Interstate 95 in Delaware between mile markers 8 and
16.
Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 3984 7590 3985 7586 3986 7585 3996 7564
3986 7559 3986 7560 3984 7559 3984 7558
3971 7551 3966 7579 3972 7579 3972 7587
3981 7591
TIME...MOT...LOC 0633Z 249DEG 9KT 3978 7579
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 3:22 AM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Salem | 2 hr |
| Apr 10, 3:44 AM EDT | Special Weather Statement | PHI | Gloucester | 46 min |
| Apr 10, 4:42 AM EDT | Special Weather Statement | PHI | Gloucester | 48 min |
| Apr 10, 4:00 PM EDT | Small Craft Advisory | PHI | 3 days | |
| Apr 10, 1:19 AM EDT | Special Weather Statement | PHI | Chester | 56 min |
| Apr 10, 2:35 AM EDT | Special Weather Statement | PHI | Delaware | 40 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.