Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 10, 2021Berks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 10, 2021, 3:06 PM EDT for Berks County, Pennsylvania. It was in force for 24 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 10, 2021, 3:06 PM EDT (19:06 UTC)
Expired: Aug 10, 2021, 3:30 PM EDT
In force: 24 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.25 in
Wind: 40

County Berks County, PA

The radar

The State College radar (KCCX), 161 km from the middle of the area, began a volume at 19:07 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 10, 3:33 PM EDT	TSTM WND DMG	2 Nnw Strausstown, PA	TREE DOWN ON ROUTE 183. 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, 7.1 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: 529 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 1096 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

379 
WWUS81 KPHI 101906
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
306 PM EDT Tue Aug 10 2021
 
PAZ060-101930-
Berks PA-
306 PM EDT Tue Aug 10 2021

...A strong thunderstorm will impact portions of northwestern Berks
County through 330 PM EDT...

At 306 PM EDT, Doppler radar was tracking a strong thunderstorm near
Pine Grove, or 8 miles north of Myerstown, moving east at 20 mph.

HAZARD...Winds in excess of 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, Wyomissing, Sinking Spring, Womelsdorf, Wernersville,
Robesonia, Bernville, Strausstown, Fairview Hgts, Spring Ridge,
Wyomissing Hills, West Lawn, Whitfield and West Wyomissing.

This includes Interstate 78 in Pennsylvania between mile markers 10
and 28.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4052 7634 4052 7625 4054 7617 4056 7613
      4057 7608 4058 7606 4058 7605 4032 7595
      4034 7619 4036 7621 4037 7623 4049 7643
TIME...MOT...LOC 1906Z 251DEG 19KT 4049 7635 

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

$$

SFJ

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 1:02 AM EDT	Special Weather Statement	PHI	Burlington	28 min
Aug 10, 3:33 AM EDT	Excessive Heat Warning	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Middlesex and 5 more	4 days
Aug 10, 3:33 AM EDT	Heat Advisory	PHI	Atlantic, Cape May, Cumberland, Monmouth, Ocean, Salem and 2 more	4 days
Aug 10, 3:54 AM EDT	Areal Flood Advisory	PHI	Atlantic	80 min
Aug 10, 4:59 AM EDT	Areal Flood Advisory	PHI	Burlington	60 min
Aug 10, 5:58 AM EDT	Flash Flood Warning	PHI	Burlington, Mercer	2 hr
Aug 10, 2:07 PM EDT	Special Weather Statement	PHI	Salem	38 min
Aug 10, 4:52 PM EDT	Special Weather Statement	PHI	Monmouth	23 min
Aug 10, 4:54 PM EDT	Special Marine Warning	PHI		26 min
Aug 10, 5:05 PM EDT	Special Weather Statement	PHI	Somerset, Warren	25 min
Aug 10, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Hunterdon, Mercer, Somerset, Warren	51 min
Aug 10, 5:30 PM EDT	Special Weather Statement	PHI	Warren	30 min
Aug 10, 5:58 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex, Morris, Somerset, Warren	32 min
Aug 10, 6:27 PM EDT	Special Weather Statement	PHI	Burlington, Mercer, Middlesex, Monmouth, Morris	33 min
Aug 10, 6:59 PM EDT	Special Weather Statement	PHI	Middlesex, Monmouth	31 min
Aug 10, 7:09 PM EDT	Special Marine Warning	PHI		66 min
Aug 10, 7:27 PM EDT	Special Weather Statement	PHI	Monmouth	33 min
Aug 9, 10:10 PM EDT	Areal Flood Advisory	PHI	Carbon	3 hr
Aug 10, 3:33 PM EDT	Special Weather Statement	PHI	Berks	27 min
Aug 10, 3:52 PM EDT	Special Weather Statement	PHI	Berks, Carbon, Lehigh	23 min
Aug 10, 4:01 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Chester, Lehigh, Montgomery, Northampton	44 min
Aug 10, 4:18 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh	3 hr
Aug 10, 4:33 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Carbon, Chester, Lehigh, Monroe and 2 more	42 min
Aug 10, 5:11 PM EDT	Special Weather Statement	PHI	Chester, Montgomery, Philadelphia	34 min
Aug 10, 5:40 PM EDT	Special Weather Statement	PHI	Chester	35 min
Aug 10, 6:36 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester	39 min
Aug 10, 7:10 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	65 min
Aug 10, 7:54 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Chester	51 min
Aug 10, 7:12 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	33 min
Aug 10, 7:42 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's, Talbot	33 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.