Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 209, NWS Philadelphia/Mount Holly

August 19, 2009Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 19, 2009, 4:35 PM EDT for Monroe County, Pennsylvania. It was in force for 55 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 19, 2009, 4:35 PM EDT (20:35 UTC)
Expired
Aug 19, 2009, 5:30 PM EDT
In force
55 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

County Monroe County, PA

The radar

The Binghamton radar (KBGM), 126 km from the middle of the area, began a volume at 20:35 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.6 hours before the alert went out and 202 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, Phillips Aaf/Abe, MD at 12:00Z on 2009-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 277 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, Phillips Aaf/Abe, MD at 12:00Z on 2009-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 square meters per square second.1939Sfc1 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
277 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
953 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-17 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 192035
SVRPHI
PAC089-192130-
/O.NEW.KPHI.SV.W.0209.090819T2035Z-090819T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
435 PM EDT WED AUG 19 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

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

* UNTIL 530 PM EDT

* AT 432 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES NORTH OF GOULDSBORO
  STATE PARK...OR 12 MILES SOUTHEAST OF SCRANTON...AND MOVING
  SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  6 MILES NORTHEAST OF GOULDSBORO STATE PARK AROUND 440 PM EDT...
  7 MILES NORTHEAST OF TOBYHANNA AROUND 445 PM EDT...
  SKYTOP...CANADENSIS...MOUNTAINHOME AND 8 MILES NORTHEAST OF
  PARADISE VALLEY AROUND 505 PM EDT...
  8 MILES NORTHEAST OF ALPINE MOUNTAIN AND 9 MILES NORTHEAST OF
  HERNYVILLE AROUND 515 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 GREATEST KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4124 7513 4116 7516 4115 7509 4109 7504
      4095 7519 4114 7563 4121 7558 4123 7554
      4123 7552 4125 7550 4125 7531 4126 7514
TIME...MOT...LOC 2034Z 293DEG 21KT 4130 7545

$$

EBERWINE
1 follow-up statement
000 
WWUS51 KPHI 192115
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
515 PM EDT WED AUG 19 2009

PAC089-192130-
/O.CON.KPHI.SV.W.0209.000000T0000Z-090819T2130Z/
MONROE PA-
515 PM EDT WED AUG 19 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR NORTHERN MONROE COUNTY...

AT 513 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR MOUNT POCONO...MOVING
SOUTHEAST AT 20 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  PARADISE VALLEY BY 520 PM EDT...
  SCOTRUN AND ALPINE MOUNTAIN BY 525 PM EDT...
  HERNYVILLE...ANALOMINK...REEDERS AND 6 MILES NORTHWEST OF ARLINGTON
  HEIGHTS BY 530 PM EDT...

LAT...LON 4112 7547 4114 7545 4115 7540 4120 7531
      4124 7525 4126 7514 4124 7513 4116 7516
      4115 7509 4109 7504 4095 7519 4109 7553
TIME...MOT...LOC 2115Z 325DEG 17KT 4113 7533

$$

EBERWINE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 18, 8:35 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery, Philadelphia70 min
Aug 19, 4:30 PM EDTAreal Flood AdvisoryPHIMonroe2 hr
Aug 19, 5:04 PM EDTFlash Flood WarningPHIMonroe115 min
Aug 19, 5:08 PM EDTSevere Thunderstorm WarningPHICarbon37 min
Aug 19, 5:51 PM EDTAreal Flood AdvisoryPHICarbon114 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009Every 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.