Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

October 25, 2021Bucks County, Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Oct 25, 2021, 7:43 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 47 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Oct 25, 2021, 7:43 PM EDT (23:43 UTC)
Expired: Oct 25, 2021, 8:30 PM EDT
In force: 47 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.25 in
Wind: 40

Counties Bucks County, PA, Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 102 km from the middle of the area, began a volume at 23:42 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.

What was reported inside it

Time	Report	Where	Remark
Oct 25, 7:52 PM EDT	TSTM WND DMG	1 N West Vincent Twp, PA	DOWNED TREES AND WIRES NEAR HALF HILL ROAD. TIME ESTIMATED FROM RADAR.
Oct 25, 7:52 PM EDT	TSTM WND DMG	2 Wsw Pughtown, PA	DOWNED TREES AND WIRES NEAR MURRAYS SCHOOL ROAD. TIME ESTIMATED FROM RADAR.
Oct 25, 7:57 PM EDT	TSTM WND DMG	2 Wsw Cedarville, PA	DOWNED TREES AND WIRES NEAR PIGEON CREEK TRAIL. TIME ESTIMATED FROM RADAR.
Oct 25, 8:00 PM EDT	TSTM WND DMG	2 N Plymouth Twp, PA	DOWNED TREE NEAR THE INTERSECTION OF SWEDE ROAD AND DEKALB PIKE. TIME ESTIMATED FROM RADAR.
Oct 25, 8:05 PM EDT	TSTM WND DMG	1 W Lower Gwynedd Twp, PA	DOWNED TREES AND WIRES NEAR STONEBRIDGE ROAD. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 11.7 hours before the alert went out and 207 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1230 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

284 
WWUS81 KPHI 252343
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
743 PM EDT Mon Oct 25 2021
 
PAZ060-061-070-101>106-260030-
Lower Bucks PA-Upper Bucks PA-Lehigh PA-Eastern Montgomery PA-
Western Montgomery PA-Delaware PA-Western Chester PA-
Eastern Chester PA-Berks PA-
743 PM EDT Mon Oct 25 2021

...Strong thunderstorms will impact portions of southeastern Berks,
south central Lehigh, Montgomery, west central Bucks, northeastern
Chester and northeastern Delaware Counties through 830 PM EDT...

At 743 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Honey Brook to Bryn Mawr. Movement was
northeast 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...
Reading, Norristown, Pottstown, Phoenixville, Lansdale, West
Norriton, East Norriton, Quakertown, Perkasie, Doylestown,
Downingtown, Conshohocken, Souderton, Ambler, Birdsboro,
Collegeville, Kutztown, Royersford, Narberth and Fleetwood.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 341.
 Northeast Extension between mile markers 21 and 45.
 Interstate 76 in Pennsylvania between mile markers 327 and 337.
 Interstate 476 in Pennsylvania between mile markers 9 and 19.
 Interstate 176 in Pennsylvania between mile markers 1 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4052 7583 4038 7498 4008 7520 4009 7522
      4006 7526 4003 7523 3997 7529 4002 7595
      4004 7593 4011 7594 4014 7588 4021 7599
TIME...MOT...LOC 2343Z 211DEG 32KT 4007 7594 4002 7530 

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

$$

JEO

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 25, 3:12 AM EDT	Gale Watch	PHI		13 hr
Oct 25, 4:15 PM EDT	Gale Warning	PHI		46 hr
Oct 25, 6:03 PM EDT	Special Marine Warning	PHI		57 min
Oct 25, 6:27 PM EDT	Special Weather Statement	PHI	Salem	33 min
Oct 25, 6:33 PM EDT	Severe Thunderstorm Warning	PHI	Salem	42 min
Oct 25, 7:02 PM EDT	Special Weather Statement	PHI	Camden, Gloucester, Salem	43 min
Oct 25, 7:34 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester	26 min
Oct 25, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware	48 min
Oct 25, 4:15 PM EDT	Special Weather Statement	PHI	Sussex	30 min
Oct 25, 5:27 PM EDT	Special Weather Statement	PHI	Kent	33 min
Oct 25, 5:06 PM EDT	Special Weather Statement	PHI	Talbot	39 min
Oct 25, 5:42 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	48 min

Nearby

Special Weather Statements in Pennsylvania, 2021 Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.