Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 153, NWS Philadelphia/Mount Holly

July 29, 2009Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2009, 2:04 PM EDT for Monroe County, Pennsylvania. It was in force for 56 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: Jul 29, 2009, 2:04 PM EDT (18:04 UTC)
Expired: Jul 29, 2009, 3:00 PM EDT
In force: 56 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Monroe County, PA

The radar

The Binghamton radar (KBGM), 135 km from the middle of the area, began a volume at 18:04 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 29, 12:49 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 6.1 hours before the alert went out and 199 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: 594 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 646 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 291804
SVRPHI
PAC089-291900-
/O.NEW.KPHI.SV.W.0153.090729T1804Z-090729T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
204 PM EDT WED JUL 29 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF MOUNT POCONO...

* UNTIL 300 PM EDT

* AT 202 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  GILBERT...OR 12 MILES SOUTH OF MOUNT POCONO...AND MOVING NORTHEAST
  AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  REEDERS AROUND 215 PM EDT...
  SCOTRUN AND 6 MILES SOUTHEAST OF MOUNT POCONO AROUND 220 PM EDT...
  HERNYVILLE...ANALOMINK...PARADISE VALLEY AND 6 MILES NORTHWEST OF
  EAST STROUDSBURG AROUND 225 PM EDT...
  ALPINE MOUNTAIN AND 6 MILES SOUTHEAST OF MOUNTAINHOME AROUND 230 PM
  EDT...
  7 MILES SOUTHEAST OF CANADENSIS AROUND 235 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT
WEDNESDAY EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN
PENNSYLVANIA.

&&

LAT...LON 4120 7514 4119 7514 4119 7515 4116 7515
      4115 7509 4108 7503 4085 7547 4107 7552
      4124 7521
TIME...MOT...LOC 1803Z 232DEG 30KT 4096 7544

$$

EBERWINE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 10:15 AM EDT	Flash Flood Watch	PHI	Berks, Delaware, Lehigh, Northampton, Philadelphia	17 hr
Jul 29, 11:48 AM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Montgomery	72 min
Jul 29, 12:12 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	78 min
Jul 29, 1:51 PM EDT	Flash Flood Warning	PHI	Carbon, Monroe	9 hr
Jul 29, 1:56 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	64 min
Jul 29, 2:11 PM EDT	Tornado Warning	PHI	Carbon, Monroe	34 min
Jul 29, 2:32 PM EDT	Flash Flood Warning	PHI	Monroe	6 hr
Jul 29, 5:09 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	66 min
Jul 29, 5:28 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh, Northampton	40 min
Jul 29, 5:55 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	4 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009 Every severe thunderstorm warning in 2009

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.