Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 10, NWS Philadelphia/Mount Holly

September 23, 1986Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 23, 1986, 4:21 PM EDT for Bucks County, Pennsylvania. It was in force for 29 min.

The area

The counties it named.

The facts

Issued
Sep 23, 1986, 4:21 PM EDT (20:21 UTC)
Expired
Sep 23, 1986, 4:50 PM EDT
In force
29 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

County Bucks County, PA

The radar

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

The nearest sounding before it

Atlantic City In, NJ (KACY), launched 12:00Z, 8.4 hours before the alert went out and 111 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 1986-09-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 47 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 1986-09-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 123 square meters per square second.1939Sfc1 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
47 J/kg
Mixed-layer CIN
-163 J/kg
Mixed-layer LCL
643 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
123 m²/s²
0-3 km storm-relative helicity
164 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 
TTAA00 KPHL 232021
SVRPHL
PAC017-232050-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA PA
421 PM EDT TUE SEP 23 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 450 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

SOUTHEAST PENNSYLVANIA...NORTHERN BUCKS

AT 415 PM EDT RADAR INDICATED A SEVERE THUNDERSTORM NEAR
ALLENTOWN PENNSYLVANIA MOVING EAST AT 30 MILES AND HOUR.
THE WEATHER SERVICE OFFICE AT ALLENTON-BETHLEHEM REPORTED A
WIND GUST OF 60 MPH SHORTLY AFTER 4 PM EDT.

 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.

 RPW

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; the sounding from the Mesonet's radiosonde archive.