Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 17, NWS Philadelphia/Mount Holly

April 1, 2008Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 1, 2008, 8:18 PM EDT for Monroe County, Pennsylvania. It was in force for 27 min. 2 reports 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: Apr 1, 2008, 8:18 PM EDT (00:18 UTC)
Expired: Apr 1, 2008, 8:45 PM EDT
In force: 27 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Monroe County, PA

The radar

The Binghamton radar (KBGM), 125 km from the middle of the area, began a volume at 00:20 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

Time	Report	Where	Remark
Apr 1, 8:36 PM EDT	TSTM WND GST 44	Mount Pocono, PA	A 44 MPH THUNDERSTORM WIND GUST WAS RECORDED AT THE MOUNT POCONO AIRPORT.
Apr 1, 8:40 PM EDT	TSTM WND DMG	2 Ese Canadensis, PA	TREES DOWN ACROSS THE NORTHEASTERN PART OF THE COUNTY.

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

The nearest sounding before it

Albany, NY (KALY), launched 00:00Z, 0.3 hours before the alert went out and 207 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: 478 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 941 m above ground
0-6 km bulk shear: 97 kt
0-1 km storm-relative helicity: 322 m²/s²
0-3 km storm-relative helicity: 385 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 020018
SVRPHI
PAC089-020045-
/O.NEW.KPHI.SV.W.0017.080402T0018Z-080402T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
818 PM EDT TUE APR 1 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 845 PM EDT

* AT 818 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED 7 MILES WEST OF POCONO PINES...AND MOVING EAST 
  AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  TOBYHANNA...MOUNT POCONO AND SCOTRUN BY 825 PM EDT...
  CANADENSIS...SKYTOP...MOUNTAINHOME AND PARADISE VALLEY BY 830 PM
  EDT...

LAT...LON 4125 7513 4116 7515 4115 7509 4109 7504
      4110 7498 4102 7554 4116 7562 4123 7554
      4123 7552 4125 7550 4125 7530 4126 7514
TIME...MOT...LOC 0018Z 251DEG 63KT 4114 7552

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 1, 9:02 PM EDT	Severe Thunderstorm Warning	PHI	Northampton	37 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; radar from the NEXRAD Level II archive.