Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 13, NWS Philadelphia/Mount Holly

March 8, 20084 counties in Pennsylvania; Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Mar 8, 2008, 5:49 PM EST for 4 counties in Pennsylvania; Warren County, New Jersey. It was in force for 41 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
Mar 8, 2008, 5:49 PM EST (22:49 UTC)
Expired
Mar 8, 2008, 6:30 PM EST
In force
41 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 135 km from the middle of the area, began a volume at 22:50 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

TimeReportWhereRemark
Mar 8, 5:50 PM ESTTSTM WND DMGAllentown, PANUMEROUS REPORTS OF TREES DOWN. SOME ROOFS OFF HOUSES.
Mar 8, 6:10 PM ESTTSTM WND GST 61Easton, PASOME POWER OUTAGES.

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

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 10.8 hours before the alert went out and 209 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, Brookhaven, NY at 12:00Z on 2008-03-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2008-03-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 176 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
444 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
240 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 082249
SVRPHI
NJC041-PAC025-077-089-095-082330-
/O.NEW.KPHI.SV.W.0013.080308T2249Z-080308T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
549 PM EST SAT MAR 8 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LEHIGH COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF ALLENTOWN...
  NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA...
  THIS INCLUDES THE CITY OF BETHLEHEM...
  CARBON COUNTY IN NORTHEAST PENNSYLVANIA...
  MONROE COUNTY IN NORTHEAST PENNSYLVANIA...
  WARREN COUNTY IN NORTHWEST NEW JERSEY...

* UNTIL 630 PM EST

* AT 545 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PENNY SIZE
  HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 8 MILES WEST OF
  NESQUEHONING TO ZIONSVILLE...OR ALONG A LINE EXTENDING FROM 30
  MILES SOUTH OF WILKES-BARRE TO 11 MILES SOUTH OF ALLENTOWN...AND
  MOVING NORTHEAST AT 55 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  BELTZVILLE STATE PARK...STEUBEN...BEERSVILLE AND BERLINSVILLE BY
  555 PM EST...
  WHITE HAVEN...PENN FOREST RESERVOIR...CHRISTMANS AND WILSON BY 600
  PM EST...
  HARMONY AND ROXBURG BY 605 PM EST...

LAT...LON 4116 7515 4115 7509 4109 7503 4110 7499
      4091 7477 4084 7481 4070 7497 4058 7519
      4062 7520 4059 7526 4045 7547 4070 7585
      4074 7578 4091 7600 4100 7576 4110 7577
      4114 7570 4113 7564 4123 7554 4126 7514
TIME...MOT...LOC 2249Z 220DEG 65KT 4088 7590 4051 7535

$$

SZATKOWSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 8, 4:40 AM ESTWind AdvisoryPHIBerks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more27 hr
Mar 8, 12:03 PM ESTFlash Flood WarningPHIBucks, Chester, Delaware, Montgomery, Philadelphia4 hr
Mar 8, 1:05 PM ESTRiver Flood WarningPHIBucks13 hr
Mar 8, 3:58 PM ESTHigh Wind WarningPHIBerks, Carbon, Delaware, Lehigh, Monroe, Northampton and 1 more6 hr
Mar 8, 5:22 PM ESTSevere Thunderstorm WarningPHIDelaware23 min
Mar 8, 5:44 PM ESTSevere Thunderstorm WarningPHIBucks, Delaware, Montgomery, Philadelphia46 min
Mar 8, 10:38 AM ESTSevere Thunderstorm WarningPHIBurlington, Ocean37 min
Mar 8, 12:36 PM ESTFlash Flood WarningPHIHunterdon, Mercer, Morris, Somerset, Sussex, Warren5 hr
Mar 8, 1:35 PM ESTRiver Flood WarningPHISomerset31 hr
Mar 8, 1:35 PM ESTRiver Flood WarningPHIEssex, Morris, Passaic4 days
Mar 8, 1:35 PM ESTRiver Flood WarningPHIEssex, Passaic4 days
Mar 8, 1:35 PM ESTRiver Flood WarningPHIPassaic44 hr
Mar 8, 1:35 PM ESTRiver Flood WarningPHIMorris, Passaic44 hr
Mar 8, 1:35 PM ESTRiver Flood WarningPHIBergen, Morris, Passaic21 hr
Mar 8, 1:35 PM ESTRiver Flood WarningPHIMiddlesex, Somerset25 hr
Mar 8, 1:35 PM ESTRiver Flood WarningPHIMorris65 hr
Mar 8, 4:09 PM ESTRiver Flood WarningPHIMorris, Somerset5 hr
Mar 8, 4:09 PM ESTRiver Flood WarningPHIMorris, Somerset5 hr
Mar 8, 4:09 PM ESTRiver Flood WarningPHIMorris, Passaic5 hr
Mar 8, 4:09 PM ESTRiver Flood WarningPHIMorris25 hr
Mar 8, 4:28 PM ESTRiver Flood WarningPHIHunterdon, Somerset17 hr
Mar 8, 6:03 PM ESTSevere Thunderstorm WarningPHIHunterdon, Mercer, Middlesex, Somerset57 min
Mar 8, 6:28 PM ESTSevere Thunderstorm WarningPHIMorris, Sussex62 min
Mar 8, 6:51 PM ESTRiver Flood WarningPHISomerset10 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2008Severe Thunderstorm Warnings in New Jersey, 2008Every severe thunderstorm warning in 2008

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.