Alert archive / Pennsylvania / Special Weather Statements in 2021

Special Weather Statement, NWS Philadelphia/Mount Holly

September 8, 2021Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this special weather statement at Sep 8, 2021, 8:47 PM EDT for Northampton County, Pennsylvania. It was in force for 28 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
Sep 8, 2021, 8:47 PM EDT (00:47 UTC)
Expired
Sep 8, 2021, 9:15 PM EDT
In force
28 min
Issued by
NWS Philadelphia/Mount Holly
Hail
0.50 in
Wind
40

County Northampton County, PA

The radar

The Philadelphia radar (KDIX), 140 km from the middle of the area, began a volume at 00:49 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

TimeReportWhereRemark
Sep 8, 9:00 PM EDTTSTM WND DMG1 N Wind Gap, PATREE DOWN ACROSS NORTH BROADWAY AT TRIBE LANE. TIME BASED ON RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 0.8 hours before the alert went out and 183 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 00:00Z on 2021-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 619 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 00:00Z on 2021-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 211 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
619 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
807 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
211 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.4

Open this sounding in Storm Lab

The text

As transmitted.

679 
WWUS81 KPHI 090047
SPSPHI

Special Weather Statement
National Weather Service Mount Holly NJ
847 PM EDT Wed Sep 8 2021
 
NJZ001-007-PAZ054-055-061-062-090115-
Sussex NJ-Warren NJ-Lehigh PA-Monroe PA-Northampton PA-Carbon PA-
847 PM EDT Wed Sep 8 2021

...Strong thunderstorms will impact portions of northwestern Sussex,
northwestern Warren, northern Lehigh, southeastern Carbon, central
Monroe and central Northampton Counties through 915 PM EDT...

At 846 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles north of Bushkill to East Stroudsburg
to near Walnutport. Movement was east at 35 mph.

HAZARD...Wind gusts up to 40 mph and half inch 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...
Allentown, Montague, Bethlehem, Northampton, East Stroudsburg,
Blairstown, Nazareth, Palmerton, Bangor, Slatington, Pen Argyl, Wind
Gap, Bath, Walnutport, Belfast, East Bangor, Steuben, Stormville,
High Point and Neffs.

This includes the following highways...
 Northeast Extension between mile markers 61 and 69.
 Interstate 80 in Pennsylvania between mile markers 304 and 314.
 Interstate 80 in New Jersey between mile markers 0 and 7.

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.

A Severe Thunderstorm Watch remains in effect until midnight EDT for
northwestern New Jersey...and eastern and northeastern Pennsylvania.

&&

LAT...LON 4131 7461 4107 7486 4063 7543 4064 7581
      4098 7535 4123 7514 4115 7515 4114 7509
      4108 7503 4116 7490 4127 7484 4135 7475
      4136 7469
TIME...MOT...LOC 0046Z 255DEG 28KT 4119 7502 4102 7520 4072 7558 

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

$$

Staarmann

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 8, 9:16 PM EDTAreal Flood AdvisoryPHIWarren3 hr
Sep 8, 9:16 PM EDTSpecial Weather StatementPHISussex, Warren29 min
Sep 8, 9:43 PM EDTSpecial Weather StatementPHISussex, Warren47 min
Sep 8, 10:42 PM EDTFlash Flood WarningPHIWarren6 hr
Sep 8, 10:56 PM EDTSpecial Weather StatementPHIWarren34 min
Sep 8, 11:27 PM EDTSevere Thunderstorm WarningPHIHunterdon, Warren48 min
Sep 8, 11:30 PM EDTAreal Flood AdvisoryPHIMorris, Sussex4 hr
Sep 9, 12:07 AM EDTSpecial Weather StatementPHIHunterdon, Somerset, Warren23 min
Sep 9, 12:18 AM EDTSpecial Marine WarningPHI57 min
Sep 9, 12:30 AM EDTSpecial Weather StatementPHIMorris30 min
Sep 9, 12:41 AM EDTSpecial Marine WarningPHI52 min
Sep 9, 2:17 AM EDTSpecial Weather StatementPHIOcean28 min
Sep 9, 2:46 AM EDTSpecial Weather StatementPHIAtlantic29 min
Sep 9, 3:14 AM EDTSpecial Weather StatementPHIAtlantic31 min
Sep 9, 3:30 AM EDTAreal Flood AdvisoryPHIAtlantic, Burlington, Cape May, Cumberland112 min
Sep 9, 4:28 AM EDTAreal Flood WarningPHIWarren4 hr
Sep 8, 9:12 PM EDTSpecial Weather StatementPHILehigh48 min
Sep 8, 9:38 PM EDTSpecial Weather StatementPHIBerks52 min
Sep 8, 9:46 PM EDTSpecial Weather StatementPHILehigh, Northampton44 min
Sep 8, 9:48 PM EDTFlash Flood WarningPHILehigh, Northampton7 hr
Sep 8, 9:59 PM EDTAreal Flood AdvisoryPHIBerks3 hr
Sep 8, 10:11 PM EDTSevere Thunderstorm WarningPHIBerks49 min
Sep 8, 10:23 PM EDTTornado WarningPHIBerks22 min
Sep 8, 10:27 PM EDTSpecial Weather StatementPHINorthampton33 min
Sep 8, 10:47 PM EDTAreal Flood AdvisoryPHICarbon, Monroe3 hr
Sep 8, 10:47 PM EDTSevere Thunderstorm WarningPHIBerks, Lehigh, Montgomery, Northampton58 min
Sep 8, 11:35 PM EDTSpecial Weather StatementPHIChester, Delaware, Montgomery40 min
Sep 9, 12:08 AM EDTSpecial Weather StatementPHIBucks, Delaware, Montgomery, Philadelphia37 min
Sep 9, 4:26 AM EDTAreal Flood WarningPHILehigh, Northampton3 hr
Sep 9, 12:58 AM EDTSpecial Weather StatementPHINew Castle32 min
Sep 9, 1:12 AM EDTAreal Flood AdvisoryPHINew Castle62 min
Sep 9, 5:37 AM EDTAreal Flood AdvisoryPHIKent, New Castle, Sussex3 hr

Nearby

Special Weather Statements in Pennsylvania, 2021Every 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.