Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 152, NWS Philadelphia/Mount Holly

July 29, 2009Monroe County, Pennsylvania; Sussex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2009, 1:56 PM EDT for Monroe County, Pennsylvania; Sussex County, New Jersey. It was in force for 64 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: Jul 29, 2009, 1:56 PM EDT (17:56 UTC)
Expired: Jul 29, 2009, 3:00 PM EDT
In force: 64 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Sussex County, NJ, Monroe County, PA

The radar

The Philadelphia radar (KDIX), 143 km from the middle of the area, began a volume at 17:56 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, 2:48 PM EDT	TORNADO 2	5 Nne Pellettown, NJ	CONFIRMED EF2 TORNADO. NUMEROUS TREES DOWN. PROPERTY DAMAGE MAINLY TO BARNS AND SILOS. PLEASE REFER TO PHLPNSPHI FOR MORE INFO. MAX WINDS 120 MPH.
Jul 29, 2:50 PM EDT	TSTM WND DMG	5 Nne Pellettown, NJ	TREES DOWN ON RT 23 IN WANTAGE.

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

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, 5.9 hours before the alert went out and 173 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 291756
SVRPHI
NJC037-PAC089-291900-
/O.NEW.KPHI.SV.W.0152.090729T1756Z-090729T1900Z/

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

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  NORTHERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 300 PM EDT

* AT 154 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 NEAR ECHO LAKE...OR 15 MILES
  EAST OF MOUNT POCONO...AND MOVING NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  FLATBROOKVILLE AROUND 205 PM EDT...
  6 MILES NORTHWEST OF FIVE POINTS AROUND 210 PM EDT...
  CRANDON LAKES AROUND 215 PM EDT...
  HAINESVILLE AROUND 225 PM EDT...
  HIGH POINT AROUND 240 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 4132 7461 4121 7448 4102 7486 4111 7493
      4101 7513 4113 7521 4116 7515 4115 7509
      4109 7503 4111 7495 4120 7488 4127 7484
      4132 7479 4135 7471
TIME...MOT...LOC 1756Z 232DEG 30KT 4108 7506

$$

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, 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
Jul 29, 12:55 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Somerset	65 min
Jul 29, 1:30 PM EDT	Areal Flood Advisory	PHI	Morris, Somerset	3 hr
Jul 29, 1:35 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	55 min
Jul 29, 2:10 PM EDT	Tornado Warning	PHI	Sussex	65 min
Jul 29, 2:21 PM EDT	Areal Flood Advisory	PHI	Middlesex	3 hr
Jul 29, 2:50 PM EDT	Flash Flood Warning	PHI	Middlesex	4 hr
Jul 29, 3:52 PM EDT	Flash Flood Warning	PHI	Morris, Somerset	4 hr
Jul 29, 5:48 PM EDT	Special Marine Warning	PHI		57 min
Jul 29, 6:11 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	26 min
Jul 29, 6:26 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Gloucester	38 min
Jul 29, 6:42 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 4 more	3 hr
Jul 29, 6:42 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden	39 min
Jul 29, 6:44 PM EDT	Flash Flood Warning	PHI	Middlesex, Somerset	3 hr
Jul 29, 6:50 PM EDT	Areal Flood Advisory	PHI	Morris	94 min
Jul 29, 7:31 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	30 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2009 Severe Thunderstorm Warnings in New Jersey, 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.