Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 149, NWS Philadelphia/Mount Holly

July 29, 20094 counties in Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2009, 12:12 PM EDT for 4 counties in Pennsylvania. It was in force for 78 min. 3 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: Jul 29, 2009, 12:12 PM EDT (16:12 UTC)
Expired: Jul 29, 2009, 1:30 PM EDT
In force: 78 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Carbon County, PA, Lehigh County, PA, Monroe County, PA, Northampton County, PA

The radar

The Binghamton radar (KBGM), 148 km from the middle of the area, began a volume at 16:14 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
Jul 29, 12:33 PM EDT	TSTM WND DMG	Jim Thorpe, PA	TREES, POWER LINES, AND HIGH TENSION LINES DOWN
Jul 29, 12:33 PM EDT	HAIL 1	Jim Thorpe, PA
Jul 29, 1:35 PM EDT	TSTM WND DMG	Wsw Stormville, PA	NUMBEROUS TREES DOWN WITH HOUSE DAMAGE IN STROUD AND HAMILTON TWPS.

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, 4.2 hours before the alert went out and 162 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: 1577 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 745 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 291612
SVRPHI
PAC025-077-089-095-291730-
/O.NEW.KPHI.SV.W.0149.090729T1612Z-090729T1730Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1212 PM EDT WED JUL 29 2009

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  NORTHERN NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  THIS INCLUDES THE CITY OF LEHIGHTON...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 130 PM EDT

* AT 1212 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  SOUTHWEST OF NEW MAHONING...OR NEAR TAMAQUA...AND MOVING NORTHEAST
  AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  NEW MAHONING AROUND 1225 PM EDT...
  LEHIGHTON AROUND 1240 PM EDT...
  BELTZVILLE STATE PARK AROUND 1255 PM EDT...
  CHRISTMANS AROUND 100 PM EDT...
  PENN FOREST RESERVOIR AROUND 105 PM EDT...
  ALBRIGHTSVILLE AROUND 110 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 4087 7511 4067 7587 4069 7588 4074 7578
      4081 7590 4086 7595 4099 7578 4101 7575
      4102 7575 4121 7550
TIME...MOT...LOC 1613Z 229DEG 22KT 4075 7591

$$
 
TFG

1 follow-up statement

000 
WWUS51 KPHI 291639
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1239 PM EDT WED JUL 29 2009

PAC025-077-089-095-291730-
/O.CON.KPHI.SV.W.0149.000000T0000Z-090729T1730Z/
LEHIGH PA-NORTHAMPTON PA-CARBON PA-MONROE PA-
1239 PM EDT WED JUL 29 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM EDT
FOR MONROE...CARBON...NORTHERN NORTHAMPTON AND EXTREME NORTH CENTRAL
LEHIGH COUNTIES...

AT 1235 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED NEAR JIM THORPE...OR NEAR LEHIGHTON...MOVING NORTHEAST AT 30
MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  BELTZVILLE STATE PARK BY 1245 PM EDT...
  CHRISTMANS BY 1250 PM EDT...
  PENN FOREST RESERVOIR BY 1255 PM EDT...
  JONAS...MECKESVILLE AND ALBRIGHTSVILLE BY 100 PM EDT...
  GILBERT BY 105 PM EDT...
  POCONO RACEWAY BY 110 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HAIL UP TO ONE INCH IN DIAMETER WAS REPORTED WITH THIS STORM AT 1230 
PM EDT IN JIM THORPE. IF YOU ARE IN THE PATH OF THE STORM...TAKE 
IMMEDIATE ACTION TO PROTECT LIFE AND PROPERTY.

&&

LAT...LON 4087 7512 4074 7573 4089 7587 4119 7552
      4121 7550
TIME...MOT...LOC 1637Z 236DEG 25KT 4087 7571

$$

AMC

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, 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, 2:04 PM EDT	Severe Thunderstorm Warning	PHI	Monroe	56 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.