Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 33, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 1990, 5:19 PM EDT for 5 counties in Pennsylvania. It was in force for 56 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 9, 1990, 5:19 PM EDT (21:19 UTC)
- Expired
- Jul 9, 1990, 6:15 PM EDT
- In force
- 56 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties Bucks County, PA, Chester County, PA, 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 9, 5:20 PM EDT | Thunderstorm Wind 0 | Chester, PA | |
| Jul 9, 5:25 PM EDT | Thunderstorm Wind 0 | Montgomery, PA | |
| Jul 9, 5:40 PM EDT | Thunderstorm Wind 0 | Montgomery, 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, 9.3 hours before the alert went out and 102 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
- -35 J/kg
- Mixed-layer LCL
- 614 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPHL 092122 SVRPHL PAC017-029-045-091-101-092215- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PHILADELPHIA PA 519 PM EDT MON JUL 9 1990 THE NATIONAL WEATHER SERVICE IN PHILADELPHIA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 615 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEAST PENNSYLVANIA ...BUCKS COUNTY...CHESTER COUNTY...DELAWARE COUNTY ...MONTGOMERY COUNTY...PHILADELPHIA COUNTY WEATHER SERVICE RADAR AT 520 PM INDICATED SEVERE THUNDERSTORMS IN WESTERN SECTIONS OF BUCKS...MONTGOMERY AND CHESTER COUNTIES OF SOUTHEASTERN PENNSYLVANIA. THESE THUNDERSTORMS WERE MOVING SOUTHEAST AT 40 MILES AN HOUR...AND WILL MOVE THROUGH THE WARNED COUNTIES AND INTO SOUTHWESTERN PORTIONS OF NEW JERSEY SHORTLY AFTER 600 PM. THESE ARE DANGEROUS STORMS. IF YOU ARE IN THE WARNED AREA...PREPARE FOR STRONG DAMAGING WINDS...LARGE HAIL...VERY HEAVY RAIN AND DEADLY LIGHTNING. SHOULD THE STORM APPROACH YOU...SEEK IMMEDIATE SHELTER INDOORS...BUT DO NOT STAND NEAR WINDOWS. MOBILE HOMES ARE MOST VULNERABLE TO HIGH WINDS AND SHOULD BE AVOIDED. A SEVERE THUNDERSTORM WATCH CONTINUES FOR SOUTHEASTERN PENNSYLVANIA UNTIL 900 PM...AND FOR SOUTHERN NEW JERSEY UNTIL 1000 PM EDT. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCED WARNING. WERT
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 3:45 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 60 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1990Every severe thunderstorm warning in 1990
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.