Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

June 18, 2008Lehigh County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 18, 2008, 4:35 PM EDT for Lehigh County, Northampton County, Pennsylvania. It was in force for 40 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: Jun 18, 2008, 4:35 PM EDT (20:35 UTC)
Expired: Jun 18, 2008, 5:15 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Lehigh County, PA, Northampton County, PA

What was reported inside it

Time	Report	Where	Remark
Jun 18, 5:00 PM EDT	TSTM WND DMG	5 Ssw Lehigh University, PA	WIRES DOWN

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.6 hours before the alert went out and 130 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: 1436 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KPHI 182034
SVRPHI
PAC077-095-182115-
/O.NEW.KPHI.SV.W.0092.080618T2035Z-080618T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
435 PM EDT WED JUN 18 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  SOUTH CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...

* UNTIL 515 PM EDT

* AT 432 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  ANCIENT OAKS...OR ABOUT 8 MILES SOUTHWEST OF ALLENTOWN...AND MOVING
  EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ZIONSVILLE BY 450 PM...
  EMMAUS BY 455 PM...
  ALLENTOWN BY 500 PM...
  HELLERTOWN...LEHIGH UNIVERSITY AND 6 MILES SOUTH OF BETHLEHEM BY
  515 PM...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

LAT...LON 4071 7535 4058 7528 4050 7541 4046 7545
      4043 7550 4047 7556 4047 7558 4051 7564
      4052 7564
TIME...MOT...LOC 2035Z 259DEG 13KT 4052 7559

$$

RNS

1 follow-up statement

000 
WWUS51 KPHI 182109
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
510 PM EDT WED JUN 18 2008

PAC077-095-182120-
/O.EXP.KPHI.SV.W.0092.000000T0000Z-080618T2115Z/
LEHIGH PA-NORTHAMPTON PA-
510 PM EDT WED JUN 18 2008

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL NORTHAMPTON AND
SOUTHEASTERN LEHIGH COUNTIES WILL EXPIRE AT 515 PM EDT...

LAT...LON 4071 7535 4058 7528 4050 7541 4046 7545
      4043 7550 4047 7556 4047 7558 4051 7564
      4052 7564
TIME...MOT...LOC 2110Z 259DEG 13KT 4054 7543

$$

RNS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 4:57 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	42 min
Jun 18, 5:03 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	57 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2008 Every severe thunderstorm warning in 2008

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.