Alert archive / Pennsylvania / Special Weather Statements in 2017
Special Weather Statement, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this special weather statement at Jul 23, 2017, 5:22 PM EDT for Delaware County, Pennsylvania. It was in force for 23 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
- Jul 23, 2017, 5:22 PM EDT (21:22 UTC)
- Expired
- Jul 23, 2017, 5:45 PM EDT
- In force
- 23 min
- Issued by
- NWS Philadelphia/Mount Holly
County Delaware County, PA
The radar
The Philadelphia radar (KDIX), 100 km from the middle of the area, began a volume at 21:24 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, 9.4 hours before the alert went out and 189 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
- 186 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 983 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 31 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
846 WWUS81 KPHI 232122 SPSPHI Special Weather Statement National Weather Service Mount Holly NJ 522 PM EDT SUN JUL 23 2017 DEZ001-PAZ070-101-102-232145- New Castle-Delaware-Western Chester-Eastern Chester- 522 PM EDT SUN JUL 23 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL NEW CASTLE... SOUTHEASTERN CHESTER AND SOUTHWESTERN DELAWARE COUNTIES... At 522 PM EDT, a strong thunderstorm was located near Westtown, or near West Chester, moving northeast at 15 mph. Locations impacted include... West Chester, Westtown, Downingtown, Gradyville, Cheyney, Newtown Square, Elam, Lionville, Marshallton, Lima, Concordville, Lionville-Marchwood, Broomall, Paoli, Radnor Township, West Goshen, Malvern, Chester Heights, Exton and Upper Providence Township. These storms will contain gusty winds up to 40 mph, torrential downpours and occasional cloud to ground lightning. Locally heavy rainfall will lead to ponding of water on roadways and poor visibility at times this afternoon. Poor drainage flooding could also develop. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. LAT...LON 3980 7559 3987 7571 4008 7569 3999 7534 TIME...MOT...LOC 2122Z 204DEG 12KT 3989 7562 $$ JRK
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 8:05 PM EDT | Special Weather Statement | PHI | Ocean | 25 min |
| Jul 22, 10:52 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Middlesex, Monmouth, Somerset | 4 hr |
| Jul 23, 12:01 AM EDT | Coastal Flood Advisory | PHI | Atlantic, Burlington, Cape May, Cumberland, Middlesex, Monmouth and 1 more | 25 hr |
| Jul 23, 3:16 PM EDT | Flash Flood Watch | PHI | Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 6 more | 15 hr |
| Jul 23, 3:43 PM EDT | Special Marine Warning | PHI | 92 min | |
| Jul 23, 4:29 PM EDT | Severe Thunderstorm Warning | PHI | Cape May, Cumberland | 26 min |
| Jul 23, 4:39 PM EDT | Areal Flood Advisory | PHI | Cape May, Cumberland, Salem | 4 hr |
| Jul 23, 4:40 PM EDT | Special Marine Warning | PHI | 65 min | |
| Jul 23, 4:26 PM EDT | Areal Flood Advisory | PHI | Chester | 3 hr |
| Jul 23, 4:48 PM EDT | Areal Flood Advisory | PHI | Chester, Delaware | 4 hr |
| Jul 23, 6:08 PM EDT | Special Weather Statement | PHI | Delaware | 37 min |
| Jul 23, 6:53 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 14 hr |
| Jul 23, 7:20 PM EDT | Flash Flood Warning | PHI | Berks, Chester, Montgomery | 6 hr |
| Jul 23, 7:41 PM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 6 hr |
| Jul 22, 10:18 PM EDT | Special Weather Statement | PHI | Caroline, Talbot | 72 min |
| Jul 22, 11:26 PM EDT | Areal Flood Advisory | PHI | Caroline, Queen Anne's, Talbot | 4 hr |
| Jul 23, 2:38 PM EDT | Special Weather Statement | PHI | Caroline, Kent, Queen Anne's, Talbot | 67 min |
| Jul 23, 2:47 PM EDT | Severe Thunderstorm Warning | PHI | Caroline, Queen Anne's, Talbot | 43 min |
| Jul 23, 2:53 PM EDT | Special Weather Statement | PHI | Cecil | 52 min |
| Jul 23, 3:27 PM EDT | Special Weather Statement | PHI | Cecil | 33 min |
| Jul 23, 3:31 PM EDT | Special Weather Statement | PHI | Dorchester | 44 min |
| Jul 23, 3:53 PM EDT | Areal Flood Advisory | PHI | Cecil, Kent | 4 hr |
| Jul 23, 5:40 PM EDT | Areal Flood Advisory | PHI | Cecil | 4 hr |
| Jul 23, 5:47 PM EDT | Special Weather Statement | PHI | Cecil | 28 min |
| Jul 23, 6:22 PM EDT | Special Weather Statement | PHI | Cecil | 38 min |
| Jul 23, 6:26 PM EDT | Flash Flood Warning | PHI | Cecil | 4 hr |
| Jul 22, 11:11 PM EDT | Special Weather Statement | PHI | Sussex | 64 min |
| Jul 23, 4:15 PM EDT | Special Weather Statement | PHI | New Castle | 30 min |
| Jul 23, 4:21 PM EDT | Areal Flood Advisory | PHI | Kent | 3 hr |
| Jul 23, 4:44 PM EDT | Special Weather Statement | PHI | New Castle | 16 min |
Nearby
Special Weather Statements in Pennsylvania, 2017Every special weather statement in 2017
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.