Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 225, NWS Philadelphia/Mount Holly

August 25, 2007Monroe County, Northampton County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 25, 2007, 9:20 PM EDT for Monroe County, Northampton County, Pennsylvania. It was in force for 55 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: Aug 25, 2007, 9:20 PM EDT (01:20 UTC)
Expired: Aug 25, 2007, 10:15 PM EDT
In force: 55 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Monroe County, PA, Northampton County, PA

The radar

The Philadelphia radar (KDIX), 128 km from the middle of the area, began a volume at 01:22 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
Aug 25, 9:36 PM EDT	TSTM WND DMG	Brodheadsville, PA	TREES DOWN IN BRODHEADSVILLE.
Aug 25, 9:40 PM EDT	TSTM WND DMG	4 W Belfast, PA	TREES AND WIRES DOWN COUNTYWIDE. MOST WIDESPREAD DAMAGE OCCURRED IN BUSHKILL TOWNSHIP.

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
Aug 25, 5:58 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 00:00Z, 1.3 hours before the alert went out and 206 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: 620 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 1398 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 260121
SVRPHI
PAC089-095-260215-
/O.NEW.KPHI.SV.W.0225.070826T0120Z-070826T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
920 PM EDT SAT AUG 25 2007

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF BETHLEHEM...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 1015 PM EDT

* AT 918 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 15
  MILES WEST OF BATH...OR ABOUT 15 MILES NORTHWEST OF ALLENTOWN...AND
  MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BATH BY 945 PM EDT...
  STEUBEN BY 950 PM EDT...
  NAZARETH...BELFAST AND 6 MILES SOUTH OF WIND GAP BY 955 PM EDT...
  EASTON AND WILSON BY 1000 PM EDT...

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT
SATURDAY EVENING FOR NORTHEAST MARYLAND AND EASTERN PENNSYLVANIA.

LAT...LON 4109 7512 4075 7518 4075 7519 4072 7519
      4069 7521 4066 7520 4059 7539 4081 7550
      4083 7549 4095 7557 4099 7550 4100 7551
      4116 7529
TIME...MOT...LOC 0120Z 271DEG 28KT 4076 7565

$$

NIERENBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 8:00 PM EDT	Severe Thunderstorm Warning	PHI	Berks	60 min
Aug 25, 8:17 PM EDT	Severe Thunderstorm Warning	PHI	Chester	58 min
Aug 25, 8:55 PM EDT	Flash Flood Warning	PHI	Carbon	4 hr
Aug 25, 8:55 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh	65 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2007 Every severe thunderstorm warning in 2007

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.