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 8, 2021, 9:46 PM EDT for Lehigh County, Northampton 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
- Sep 8, 2021, 9:46 PM EDT (01:46 UTC)
- Expired
- Sep 8, 2021, 10:30 PM EDT
- In force
- 44 min
- Issued by
- NWS Philadelphia/Mount Holly
- Hail
- 0.25 in
- Wind
- 40
Counties Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 125 km from the middle of the area, began a volume at 01:49 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
Brookhaven, NY (KOKX), launched 00:00Z, 1.8 hours before the alert went out and 216 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
- 619 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 807 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 211 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.4
The text
As transmitted.
286
WWUS81 KPHI 090146
SPSPHI
Special Weather Statement
National Weather Service Mount Holly NJ
946 PM EDT Wed Sep 8 2021
PAZ055-061-062-090230-
Lehigh PA-Monroe PA-Northampton PA-
946 PM EDT Wed Sep 8 2021
...Strong thunderstorms will impact portions of central Lehigh, south
central Monroe and Northampton Counties through 1030 PM EDT...
At 946 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Bath to near Claussville. Movement was
northeast at 20 mph.
HAZARD...Wind gusts up to 45 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...
Allentown, Bethlehem, Northampton, Nazareth, Bangor, Slatington, Pen
Argyl, Wind Gap, Bath, Walnutport, Belfast, Tatamy, East Bangor,
Steuben, Neffs, Coffeetown, Berlinsville, Emerald, Claussville and
Danielsville.
This includes the following highways...
Northeast Extension between mile markers 57 and 69.
Interstate 78 in Pennsylvania between mile markers 45 and 53.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
A Severe Thunderstorm Watch remains in effect until midnight EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.
&&
LAT...LON 4091 7509 4077 7515 4078 7517 4075 7520
4054 7566 4054 7568 4062 7580 4069 7574
4079 7558 4081 7553 4081 7548 4083 7548
4090 7531
TIME...MOT...LOC 0146Z 244DEG 19KT 4077 7539 4059 7572
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
$$
StaarmannThe 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, 9:48 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, 12:08 AM EDT | Special Weather Statement | PHI | Bucks, Delaware, Montgomery, Philadelphia | 37 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.