Alert archive / Delaware / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 92, NWS Philadelphia/Mount Holly

October 5, 1995New Castle County, Delaware; Chester County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 5, 1995, 11:15 PM EDT for New Castle County, Delaware; Chester County, Pennsylvania. It was in force for 60 min.

The area

The counties it named.

The facts

Issued: Oct 5, 1995, 11:15 PM EDT (03:15 UTC)
Expired: Oct 6, 1995, 12:15 AM EDT
In force: 60 min
Issued by: NWS Philadelphia/Mount Holly
Area: Whole counties

Counties New Castle County, DE, Chester County, PA

The radar

The Dover AFB radar (KDOX), 108 km from the middle of the area, began a volume at 03:18 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.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.3 hours before the alert went out and 173 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 937 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 608 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 415 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KPHL 060317 RRA
SVRPHL
DEC003-PAC029-060415-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
1115 PM EDT THU OCT 5 1995
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 AM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN  DELAWARE
 
   ...NEW CASTLE COUNTY
 
IN  PENNSYLVANIA
 
   ...CHESTER COUNTY
 
AT 11:00 PM EDT...WEATHER SERVICE RADAR INDICATED A LINE OF
THUNDERSTORMS FROM EASTERN LANCASTER COUNTY IN PENNSYLVANIA SOUTH THRU
CECIL AND KENT COUNTIES IN MARYLAND. THIS LINE IS MOVING NORTHEAST AT
40 TO 50 MPH AND HAS A HISTORY OF PRODUCING SEVERE WEATHER.
 
THESE ARE DANGEROUS STORMS.  PREPARE FOR STRONG DAMAGING WINDS...
...HEAVY RAINS AND DEADLY LIGHTNING.  SHOULD A STORM
APPROACH MOVE INSIDE QUICKLY. DO NOT STAND NEAR WINDOWS.  MOBILE
HOMES ARE MOST VULNERABLE TO HIGH WINDS AND SHOULD BE AVOIDED.
 `
A TORNADO WATCH CONTINUES FOR EASTERN PENNSYLVANIA...EASTERN
MARYLAND...DELAWARE AND NEW JERSEY UNTIL 400 AM EDT.  REMEMBER
SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCED WARNING.
 
AMC

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 5, 11:43 PM EDT	Severe Thunderstorm Warning	PHI	Delaware	62 min
Oct 6, 12:06 AM EDT	Severe Thunderstorm Warning	PHI	Montgomery	52 min
Oct 6, 12:21 AM EDT	Severe Thunderstorm Warning	PHI	Bucks	54 min

Nearby

Severe Thunderstorm Warnings in Delaware, 1995 Severe Thunderstorm Warnings in Pennsylvania, 1995 Every severe thunderstorm warning in 1995

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; radar from the NEXRAD Level II archive.