Alert archive / Delaware / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 35, NWS Wilmington, NC

July 5, 1990Kent County, New Castle County, Delaware

NWS Wilmington, NC issued this severe thunderstorm warning at Jul 5, 1990, 4:42 PM EDT for Kent County, New Castle County, Delaware. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jul 5, 1990, 4:42 PM EDT (20:42 UTC)
Expired
Jul 5, 1990, 6:45 PM EDT
In force
2 hr
Issued by
NWS Wilmington, NC
Area
Whole counties

Counties Kent County, DE, New Castle County, DE

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, 8.7 hours before the alert went out and 93 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 1990-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1652 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 1990-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 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
1652 J/kg
Mixed-layer CIN
-382 J/kg
Mixed-layer LCL
1207 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
157 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 KILG 052042 RRA
SVRILG
DEC001-003-052245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE WILMINGTON DE
442 PM EDT THU JUL 5 1990
 
THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  645 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...S...
 
IN CENTRAL DELAWARE
 
   ...KENT COUNTY
 
  AND FOR MARINE INTERESTS NEAR
 
  ...BOWERS BEACH
 
IN NORTH DELAWARE
 
   ...SOUTHERN NEW CASTLE COUNTY
SEVERE THUNDERSTORM WATCH IN EFFECT FOR NEW CASTLE KENT AND NORTHERN
SUSSEX COUNTIES UNTIL 8PM THIS EVENING.
 
A THUNDERSTORM WITH EXTREMELY HEAVY RAIN SMALL HAIL...DIME SIZE
REPORTED IN NEWARK...DEADLY LIGHTNING AND GUSTY WINDS TO ABOUT 55 MPH
IS MOVING INTO CENTRAL AND SOUTH NEW CASTLE COUNTY OF DELAWARE THEN
INTO NORTHCENTRAL AND NORTHEAST KENT COUNTY AND OUT OVER THE DELAWARE
BAY. RESIDENT IN THESE AREAS SHOULD BE ALERT FOR THIS STORM AND TAKE
SHELTER AS THE STORM APPROACHES. MOTORIST SHOULD PULL OFF THE ROAD
UNTIL THE STORM PASSES. BOATERS SHOULD AVOID THIS STORM. STREETS WILL
BE FLOODED AS THE STORM PASSES.
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.
CKD

The office that day

Everything else NWS Wilmington, NC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 5, 5:07 PM EDTFlash Flood WarningILMNew Castle2 hr
Jul 5, 7:21 PM EDTSevere Thunderstorm WarningILMSussex2 hr

Nearby

Severe Thunderstorm Warnings in Delaware, 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; the sounding from the Mesonet's radiosonde archive.