Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 4, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 19, 1986, 1:58 AM EDT for Delaware County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 32 min. 3 reports 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 19, 1986, 1:58 AM EDT (05:58 UTC)
- Expired
- Jul 19, 1986, 2:30 AM EDT
- In force
- 32 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Delaware County, PA, Montgomery County, PA, Philadelphia 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 19, 2:05 AM EDT | Thunderstorm Wind 0 | Montgomery, PA | |
| Jul 19, 2:10 AM EDT | Thunderstorm Wind 0 | Delaware, PA | |
| Jul 19, 2:15 AM EDT | Hail 0.75 | Philadelphia, 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 00:00Z, 6.0 hours before the alert went out and 95 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.
- Mixed-layer CAPE
- 684 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 958 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 190558 SVRPHL PAC101-045-091-190630- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA PA 158 AM EDT SAT JUL 19 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 230 AM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF SOUTHEAST PENNSYLVANIA...PHILADELPHIA...EASTERN DELAWARE AND SOUTHERN MONTGOMERY AT 155 AM EDT RADAR INDICATED A HEAVY THUNDERSTORM OVER WESTERN PORTION OF PHILADELPHIA COUNTY AND A TRAINED WEATHER SPOTTER REPORTED 1 INCH HAIL OVER KING OF PRUSSIA PA. THE STORM WAS MOVING TOWARD THE SOUTH AT 30 MILES AN HOUR. THIS IS A DANGEROUS STORM AND PEOPLE IN THE WARNED AREA SHOULDC 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. KWH
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.