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 9, 2021, 12:08 AM EDT for 4 counties in Pennsylvania. It was in force for 37 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 9, 2021, 12:08 AM EDT (04:08 UTC)
- Expired
- Sep 9, 2021, 12:45 AM EDT
- In force
- 37 min
- Issued by
- NWS Philadelphia/Mount Holly
- Hail
- 0.25 in
- Wind
- 40
Counties Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 92 km from the middle of the area, began a volume at 04:08 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, 4.1 hours before the alert went out and 198 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
- 1652 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 1146 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 136 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 7.0
The text
As transmitted.
329
WWUS81 KPHI 090408
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
1208 AM EDT Thu Sep 9 2021
DEZ001-NJZ009-010-015>019-PAZ070-071-101>106-090445-
New Castle DE-Salem NJ-Camden NJ-Mercer NJ-Hunterdon NJ-
Northwestern Burlington NJ-Somerset NJ-Gloucester NJ-Lower Bucks PA-
Eastern Montgomery PA-Western Chester PA-Philadelphia PA-
Upper Bucks PA-Western Montgomery PA-Delaware PA-Eastern Chester PA-
1208 AM EDT Thu Sep 9 2021
...Strong thunderstorms will impact portions of northern New Castle,
northwestern Camden, northwestern Mercer, west central Somerset,
northwestern Salem, southeastern Hunterdon, northwestern Gloucester,
northwestern Burlington, southeastern Montgomery, Bucks, southeastern
Chester, Philadelphia and Delaware Counties through 1245 AM EDT...
At 1208 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Perkasie to Broomall to North Star. Movement
was east at 35 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Philadelphia, Trenton, Camden, Wilmington, Newark, Gloucester City,
Cherry Hill, Bensalem, Mount Laurel, Ewing, Norristown, Chester,
Willingboro, Deptford, West Deptford, Lansdale, West Norriton, East
Norriton, Pennsville and Bellmawr.
This includes the following highways...
New Jersey Turnpike between exits 1 and 4.
Pennsylvania Turnpike between mile markers 323 and 358.
Northeast Extension between mile markers 21 and 33.
Interstate 95 in Pennsylvania between mile markers 0 and 40.
Interstate 95 in Delaware between mile markers 8 and 23.
Interstate 76 in Pennsylvania between mile markers 327 and 351.
Interstate 76 in New Jersey between mile markers 0 and 3.
Interstate 295 in New Jersey between mile markers 0 and 31, between
mile markers 33 and 43, and between mile markers 74 and 76.
Interstate 676 in Pennsylvania between mile markers 0 and 1.
Interstate 676 in New Jersey between mile markers 0 and 4.
Interstate 476 in Pennsylvania between mile markers 0 and 19.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 3998 7552 4048 7527 4053 7474 3996 7488
3964 7540 3970 7579 3972 7579 3972 7592
3974 7605
TIME...MOT...LOC 0408Z 269DEG 29KT 4037 7528 3997 7538 3974 7575
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
$$
SFJThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 8, 9:16 PM EDT | Areal Flood Advisory | PHI | Warren | 3 hr |
| Sep 8, 9:16 PM EDT | Special Weather Statement | PHI | Sussex, Warren | 29 min |
| Sep 8, 9:43 PM EDT | Special Weather Statement | PHI | Sussex, Warren | 47 min |
| Sep 8, 10:42 PM EDT | Flash Flood Warning | PHI | Warren | 6 hr |
| Sep 8, 10:56 PM EDT | Special Weather Statement | PHI | Warren | 34 min |
| Sep 8, 11:27 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 48 min |
| Sep 8, 11:30 PM EDT | Areal Flood Advisory | PHI | Morris, Sussex | 4 hr |
| Sep 9, 12:07 AM EDT | Special Weather Statement | PHI | Hunterdon, Somerset, Warren | 23 min |
| Sep 9, 12:18 AM EDT | Special Marine Warning | PHI | 57 min | |
| Sep 9, 12:30 AM EDT | Special Weather Statement | PHI | Morris | 30 min |
| Sep 9, 12:41 AM EDT | Special Marine Warning | PHI | 52 min | |
| Sep 9, 2:17 AM EDT | Special Weather Statement | PHI | Ocean | 28 min |
| Sep 9, 2:46 AM EDT | Special Weather Statement | PHI | Atlantic | 29 min |
| Sep 9, 3:14 AM EDT | Special Weather Statement | PHI | Atlantic | 31 min |
| Sep 9, 3:30 AM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Cape May, Cumberland | 112 min |
| Sep 9, 4:28 AM EDT | Areal Flood Warning | PHI | Warren | 4 hr |
| Sep 8, 8:47 PM EDT | Special Weather Statement | PHI | Northampton | 28 min |
| Sep 8, 9:12 PM EDT | Special Weather Statement | PHI | Lehigh | 48 min |
| Sep 8, 9:38 PM EDT | Special Weather Statement | PHI | Berks | 52 min |
| Sep 8, 9:46 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 44 min |
| Sep 8, 9:48 PM EDT | Flash Flood Warning | PHI | Lehigh, Northampton | 7 hr |
| Sep 8, 9:59 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Sep 8, 10:11 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 49 min |
| Sep 8, 10:23 PM EDT | Tornado Warning | PHI | Berks | 22 min |
| Sep 8, 10:27 PM EDT | Special Weather Statement | PHI | Northampton | 33 min |
| Sep 8, 10:47 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 3 hr |
| Sep 8, 10:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Montgomery, Northampton | 58 min |
| Sep 8, 11:35 PM EDT | Special Weather Statement | PHI | Chester, Delaware, Montgomery | 40 min |
| Sep 9, 4:26 AM EDT | Areal Flood Warning | PHI | Lehigh, Northampton | 3 hr |
| Sep 9, 12:58 AM EDT | Special Weather Statement | PHI | New Castle | 32 min |
| Sep 9, 1:12 AM EDT | Areal Flood Advisory | PHI | New Castle | 62 min |
| Sep 9, 5:37 AM EDT | Areal Flood Advisory | PHI | Kent, New Castle, Sussex | 3 hr |
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.