Alert archive / Pennsylvania / Special Weather Statements in 2020

Special Weather Statement, NWS Philadelphia/Mount Holly

August 2, 2020Lehigh County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 2, 2020, 8:24 AM EDT for Lehigh County, Pennsylvania. It was in force for 36 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 2, 2020, 8:24 AM EDT (12:24 UTC)
Expired: Aug 2, 2020, 9:00 AM EDT
In force: 36 min
Issued by: NWS Philadelphia/Mount Holly

County Lehigh County, PA

The radar

The Philadelphia radar (KDIX), 138 km from the middle of the area, began a volume at 12:23 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 12:00Z, 0.4 hours before the alert went out and 240 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: 940 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 129 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

866 
WWUS81 KPHI 021224
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
824 AM EDT Sun Aug 2 2020

PAZ054-061-062-021300-
Lehigh-Northampton-Carbon-
824 AM EDT Sun Aug 2 2020

...A STRONG THUNDERSTORM WILL AFFECT NORTHERN LEHIGH...SOUTHEASTERN
CARBON AND WEST CENTRAL NORTHAMPTON COUNTIES...

At 824 AM EDT, a strong thunderstorm was located over New Tripoli, or
11 miles south of Lehighton, moving northeast at 25 mph.

Wind gusts up to 45 mph are possible with this storm.

Locations impacted include...
Allentown, Bethlehem, Northampton, Palmerton, Slatington, Walnutport,
Danielsville, Neffs, Coffeetown, New Tripoli, Berlinsville, Jordan
Valley, Emerald, Beersville, Schnecksville, Claussville, Catasauqua,
Coplay, North Catasauqua and Bowmanstown.

This includes the following highways...
 Northeast Extension between mile markers 58 and 73.
 Interstate 78 in Pennsylvania between mile markers 45 and 47.

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4072 7580 4074 7576 4075 7576 4087 7556
      4064 7538 4057 7573 4059 7576 4070 7582
TIME...MOT...LOC 1224Z 245DEG 21KT 4067 7572 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 7:34 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Warren	3 hr
Aug 2, 8:06 AM EDT	Special Weather Statement	PHI	Hunterdon	24 min
Aug 2, 8:31 AM EDT	Special Weather Statement	PHI	Hunterdon	29 min
Aug 2, 8:46 AM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	3 hr
Aug 2, 3:33 PM EDT	Flash Flood Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	48 hr
Aug 2, 5:04 PM EDT	Tropical Storm Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more	18 hr
Aug 2, 5:14 PM EDT	Special Weather Statement	PHI	Warren	31 min
Aug 2, 6:29 PM EDT	Special Weather Statement	PHI	Warren	31 min
Aug 2, 3:32 AM EDT	Areal Flood Advisory	PHI	Berks	4 hr
Aug 2, 4:42 AM EDT	Flash Flood Warning	PHI	Berks	4 hr
Aug 2, 6:30 AM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	45 min
Aug 2, 6:37 AM EDT	Tornado Warning	PHI	Berks, Lehigh	23 min
Aug 2, 6:56 AM EDT	Tornado Warning	PHI	Berks, Lehigh	34 min
Aug 2, 7:13 AM EDT	Areal Flood Advisory	PHI	Berks, Lehigh, Northampton	3 hr
Aug 2, 7:29 AM EDT	Special Weather Statement	PHI	Lehigh	31 min
Aug 2, 7:39 AM EDT	Tornado Warning	PHI	Bucks, Lehigh, Northampton	36 min
Aug 2, 7:49 AM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	84 min
Aug 2, 7:54 AM EDT	Special Weather Statement	PHI	Lehigh	36 min
Aug 2, 8:28 AM EDT	Areal Flood Warning	PHI	Berks	3 hr
Aug 2, 5:51 PM EDT	Special Weather Statement	PHI	Lehigh, Northampton	39 min
Aug 2, 4:25 PM EDT	Coastal Flood Watch	PHI	Caroline, Cecil, Kent, Queen Anne's, Talbot	24 hr

Nearby

Special Weather Statements in Pennsylvania, 2020 Every special weather statement in 2020

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.