Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 13, NWS State College, PA

July 29, 1986Northampton County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jul 29, 1986, 2:45 PM EDT for Northampton County, Pennsylvania. It was in force for 15 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 29, 1986, 2:45 PM EDT (18:45 UTC)
Expired
Jul 29, 1986, 3:00 PM EDT
In force
15 min
Issued by
NWS State College, PA
Area
Whole counties

County Northampton County, PA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
Jul 29, 2:46 PM EDTHail 1.75Northampton, PA

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 6.8 hours before the alert went out and 160 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, Atlantic City In, NJ at 12:00Z on 1986-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2023 joules per kilogram.LCLLFCEL10008507005003002001001 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, Atlantic City In, NJ at 12:00Z on 1986-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.193958Sfc1 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
2023 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1005 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHL 291901
SVRABE
PAC011-095-291850-

BULLETIN-IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE ALLENTOWN PA
ISSUED BY PHILADELPHIA
 245 PM EDT TUE JUL 29 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL    3 PM EST FOR PEOPLE IN THE FOLLOWING COUNTY   OF

EASTERN PENNSYLVANIA...NORTHAMPTON

AT   230 PM EDT  1 INCH HAIL WAS REPORT NEAR WALNUTPORT  BY A SEVERE
WEATHER SPOTTER

THIS IS A DANGEROUS STORM AND PEOPLE IN THE WARNED AREA SHOULD
PREPARE FOR STRONG DAMAGING WINDS..LARGE HAIL..VERY HEAVY RAIN AND
LIGHTNING.  SHOULD THE STORM APPROACH YOU..SEEK IMMEDIATE SHELTER.
MOBILE TRAILERS ARE MOST VULNERABLE TO HIGH WINDS AND SHOULD BE
AVOIDED.

A SEVERE THUNDERSTORM WATCH CONTINUES FOR UNTIL 8PM EDT FOR EASTERN
PENNSYLVANIA AND NEW JERSEY.


WN/FUNK

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 29, 1:15 PM EDTSevere Thunderstorm WarningCTPDauphin30 min
Jul 29, 3:45 PM EDTSevere Thunderstorm WarningCTPDauphin45 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1986Every severe thunderstorm warning in 1986

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.