Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

August 12, 2021Carbon County, Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 12, 2021, 11:20 PM EDT for Carbon County, Lehigh County, Northampton County, Pennsylvania. It was in force for 40 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: Aug 12, 2021, 11:20 PM EDT (03:20 UTC)
Expired: Aug 13, 2021, 12:00 AM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Hail: 0.00 in
Wind: 40

Counties Carbon County, PA, Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 148 km from the middle of the area, began a volume at 03:24 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, 3.3 hours before the alert went out and 235 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: 2808 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 1565 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.9

Open this sounding in Storm Lab

The text

As transmitted.

661 
WWUS81 KPHI 130320
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
1120 PM EDT Thu Aug 12 2021
 
PAZ054-055-060>062-103-105-130400-
Upper Bucks PA-Lehigh PA-Monroe PA-Western Montgomery PA-
Northampton PA-Berks PA-Carbon PA-
1120 PM EDT Thu Aug 12 2021

...Strong thunderstorms will impact portions of northeastern Berks,
Lehigh, northwestern Montgomery, Carbon, northwestern Bucks,
southwestern Monroe and central Northampton Counties through MIDNIGHT
EDT...

At 1119 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Jim Thorpe to Fairview Hgts. Movement was
east at 40 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Allentown, Lehighton, Bethlehem, Emmaus, Northampton, Quakertown,
Hellertown, Nazareth, Palmerton, Kutztown, Jim Thorpe, Hamburg,
Slatington, Fleetwood, Pen Argyl, Nesquehoning, East Greenville, Wind
Gap, Bath and Weatherly.

People at the Musikfest should seek safe shelter immediately!

This includes the following highways...
 Northeast Extension between mile markers 41 and 84.
 Interstate 78 in Pennsylvania between mile markers 26 and 68.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 4058 7607 4057 7602 4065 7598 4070 7583
      4074 7576 4088 7596 4093 7595 4095 7589
      4096 7520 4039 7538 4043 7612
TIME...MOT...LOC 0319Z 260DEG 40KT 4091 7577 4044 7604 

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

$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 12, 11:49 PM EDT	Special Weather Statement	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	56 min
Aug 13, 7:32 PM EDT	Special Marine Warning	PHI		88 min
Aug 12, 10:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon	48 min
Aug 13, 5:31 PM EDT	Special Weather Statement	PHI	Chester	44 min
Aug 13, 3:21 PM EDT	Special Weather Statement	PHI	Sussex	24 min
Aug 13, 6:04 PM EDT	Special Weather Statement	PHI	Sussex	26 min
Aug 13, 6:45 PM EDT	Severe Thunderstorm Warning	PHI	Kent	30 min
Aug 13, 6:47 PM EDT	Special Weather Statement	PHI	Sussex	43 min
Aug 13, 6:53 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	37 min
Aug 13, 7:12 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	33 min
Aug 13, 7:30 PM EDT	Special Weather Statement	PHI	Sussex	45 min
Aug 13, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	47 min
Aug 13, 7:57 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	93 min
Aug 13, 6:02 PM EDT	Special Weather Statement	PHI	Kent, Queen Anne's	58 min
Aug 13, 6:29 PM EDT	Special Weather Statement	PHI	Caroline	31 min
Aug 13, 6:29 PM EDT	Severe Thunderstorm Warning	PHI	Queen Anne's, Talbot	25 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.