Alert archive / Pennsylvania / Special Weather Statements in 2020

Special Weather Statement, NWS Philadelphia/Mount Holly

August 2, 2020Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Aug 2, 2020, 5:51 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 39 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, 5:51 PM EDT (21:51 UTC)
Expired
Aug 2, 2020, 6:30 PM EDT
In force
39 min
Issued by
NWS Philadelphia/Mount Holly

Counties Lehigh County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 121 km from the middle of the area, began a volume at 21:53 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, 9.9 hours before the alert went out and 217 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-pSkew-T log-p diagram, Brookhaven, NY at 12:00Z on 2020-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2020-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

143 
WWUS81 KPHI 022151
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
551 PM EDT Sun Aug 2 2020

PAZ054-055-060>062-105-022230-
Upper Bucks-Lehigh-Monroe-Northampton-Berks-Carbon-
551 PM EDT Sun Aug 2 2020

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT NORTHEASTERN BERKS...
LEHIGH...SOUTHEASTERN CARBON...NORTH CENTRAL BUCKS...SOUTHWESTERN
MONROE AND NORTHAMPTON COUNTIES...

At 550 PM EDT, strong thunderstorms were clustered over New Tripoli,
or 11 miles south of Lehighton, moving northeast at 25 mph.

Wind gusts up to 40 mph and pea size hail are possible with these 
storms.

Locations impacted include...
Allentown, Easton, Lehighton, Bethlehem, Forks, Emmaus, Northampton,
Wilson, Hellertown, Nazareth, Palmerton, Bangor, Kutztown, Jim
Thorpe, Slatington, Pen Argyl, Wind Gap, Bath, Walnutport and
Belfast.

This includes the following highways...
 Northeast Extension between mile markers 53 and 82.
 Interstate 78 in Pennsylvania between mile markers 38 and 76.
 Interstate 80 in Pennsylvania between mile markers 302 and 308.

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

LAT...LON 4071 7519 4068 7520 4066 7518 4065 7520
      4062 7519 4061 7520 4057 7519 4056 7517
      4051 7587 4069 7587 4070 7583 4074 7576
      4077 7581 4089 7570 4102 7550 4107 7524
TIME...MOT...LOC 2150Z 240DEG 23KT 4067 7574 

$$

NC

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 7:34 AM EDTAreal Flood AdvisoryPHIHunterdon, Warren3 hr
Aug 2, 8:06 AM EDTSpecial Weather StatementPHIHunterdon24 min
Aug 2, 8:31 AM EDTSpecial Weather StatementPHIHunterdon29 min
Aug 2, 8:46 AM EDTAreal Flood AdvisoryPHIHunterdon, Morris, Somerset, Sussex, Warren3 hr
Aug 2, 3:33 PM EDTFlash Flood WatchPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more48 hr
Aug 2, 5:04 PM EDTTropical Storm WatchPHIAtlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 8 more18 hr
Aug 2, 5:14 PM EDTSpecial Weather StatementPHIWarren31 min
Aug 2, 6:29 PM EDTSpecial Weather StatementPHIWarren31 min
Aug 2, 3:32 AM EDTAreal Flood AdvisoryPHIBerks4 hr
Aug 2, 4:42 AM EDTFlash Flood WarningPHIBerks4 hr
Aug 2, 6:30 AM EDTSevere Thunderstorm WarningPHIBerks, Lehigh45 min
Aug 2, 6:37 AM EDTTornado WarningPHIBerks, Lehigh23 min
Aug 2, 6:56 AM EDTTornado WarningPHIBerks, Lehigh34 min
Aug 2, 7:13 AM EDTAreal Flood AdvisoryPHIBerks, Lehigh, Northampton3 hr
Aug 2, 7:29 AM EDTSpecial Weather StatementPHILehigh31 min
Aug 2, 7:39 AM EDTTornado WarningPHIBucks, Lehigh, Northampton36 min
Aug 2, 7:49 AM EDTAreal Flood AdvisoryPHIBerks, Carbon, Lehigh, Monroe, Northampton84 min
Aug 2, 7:54 AM EDTSpecial Weather StatementPHILehigh36 min
Aug 2, 8:24 AM EDTSpecial Weather StatementPHILehigh36 min
Aug 2, 8:28 AM EDTAreal Flood WarningPHIBerks3 hr
Aug 2, 4:25 PM EDTCoastal Flood WatchPHICaroline, Cecil, Kent, Queen Anne's, Talbot24 hr

Nearby

Special Weather Statements in Pennsylvania, 2020Every 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.