Alert archive / Pennsylvania / Special Weather Statements in 2022

Special Weather Statement, NWS Philadelphia/Mount Holly

August 9, 2022Montgomery County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 9, 2022, 4:18 PM EDT for Montgomery County, Pennsylvania. It was in force for 27 min. 1 report 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: Aug 9, 2022, 4:18 PM EDT (20:18 UTC)
Expired: Aug 9, 2022, 4:45 PM EDT
In force: 27 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.00 in
Wind: 40

County Montgomery County, PA

The radar

The Philadelphia radar (KDIX), 122 km from the middle of the area, began a volume at 20:20 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
Aug 9, 4:34 PM EDT	HAIL 0.25	1 Nne Pottstown, PA	MPING REPORT OF PEA SIZED HAIL IN POTTSTOWN.

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, 8.3 hours before the alert went out and 199 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: 144 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1264 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

059 
WWUS81 KPHI 092018
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
418 PM EDT Tue Aug 9 2022
 
PAZ060-101-103-092045-
Western Montgomery PA-Western Chester PA-Berks PA-
418 PM EDT Tue Aug 9 2022

...Strong thunderstorms will impact portions of southeastern Berks,
west central Montgomery and north central Chester Counties through
445 PM EDT...

At 418 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Pottstown to near New Morgan. Movement was
east at 10 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Pottstown, Birdsboro, Schwenksville, Elverson, New Morgan, Spring
Mount, Cedarville, Gilbertsville, Stowe, Boyertown, Pottsgrove, South
Pottstown, Amity Gardens, Sanatoga, Kenilworth, Halfway House, Flying
Hills, Lorane and Harleysville.

This includes the following highways...
 Pennsylvania Turnpike between mile markers 296 and 302.
 Interstate 176 in Pennsylvania between mile markers 1 and 9.

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.

&&

LAT...LON 4033 7565 4027 7536 4013 7587 4016 7591
      4024 7604 4025 7604
TIME...MOT...LOC 2018Z 289DEG 7KT 4029 7568 4022 7595 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 10:04 AM EDT	Excessive Heat Warning	PHI	Burlington, Camden, Gloucester, Mercer, Middlesex, Monmouth and 2 more	10 hr
Aug 9, 5:00 PM EDT	Special Weather Statement	PHI	Middlesex	30 min
Aug 9, 6:25 PM EDT	Special Weather Statement	PHI	Gloucester	35 min
Aug 9, 7:08 PM EDT	Special Weather Statement	PHI	Burlington	37 min
Aug 9, 3:02 PM EDT	Special Weather Statement	PHI	Berks	28 min
Aug 9, 4:02 PM EDT	Special Weather Statement	PHI	Lehigh	28 min
Aug 9, 4:32 PM EDT	Special Weather Statement	PHI	Lehigh	28 min
Aug 9, 4:36 PM EDT	Special Weather Statement	PHI	Chester	24 min
Aug 9, 4:55 PM EDT	Special Weather Statement	PHI	Berks	35 min
Aug 9, 5:18 PM EDT	Special Weather Statement	PHI	Berks	27 min
Aug 9, 6:03 PM EDT	Special Weather Statement	PHI	Delaware	27 min

Nearby

Special Weather Statements in Pennsylvania, 2022 Every special weather statement in 2022

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.