Alert archive / Delaware / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 36, NWS Wilmington, NC

July 5, 1990Sussex County, Delaware

NWS Wilmington, NC issued this severe thunderstorm warning at Jul 5, 1990, 7:21 PM EDT for Sussex County, Delaware. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jul 5, 1990, 7:21 PM EDT (23:21 UTC)
Expired
Jul 5, 1990, 9:30 PM EDT
In force
2 hr
Issued by
NWS Wilmington, NC
Area
Whole counties

County Sussex 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

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.4 hours before the alert went out and 84 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, Wallops Is Stn, VA at 12:00Z on 1990-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1310 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, Wallops Is Stn, VA at 12:00Z on 1990-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
1310 J/kg
Mixed-layer CIN
-346 J/kg
Mixed-layer LCL
1501 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KILG 052322 RRA
SVRILG
DEC005-060130-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE WILMINGTON DE
721 PM EDT THU JUL 5 1990
 
THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL  930 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS......
 
IN SOUTH DELAWARE
 
   ...SOUTHERN SUSSEX COUNTY
 
  AND FOR MARINE INTERESTS FROM
 
   ...FENWICK ISLAND  TO  INDIAN RIVER INLET
 
NATIONAL WEATHER SERVICE RADAR SHOWS A THUNDERSTORM NEAR SHARPTOWN
MARYLAND MOVING EAST TOWARD SUSSEX COUNTY DELAWARE...THIS STORM WILL
CROSS THE SOUTH THIRD OF SUSSEX DURING THE NEXT HOUR TO HOUR AND A
HALF AND REACH THE ATLANTIC COAST NEAR FENWICK ISLAND. PERSON IN THE
PATH OF THIS STORM SHOULD BE ALERT AND BE PREPARED TO SEEK A SAFE
SHELTER AS THE STORM MOVES INTO YOUR AREA. THIS STORM WILL CONTAIN
DANGEROUS LIGHTNING...EXTREMELY HEAVY RAIN AND POSSIBLE WIND GUST TO
OVER 50 MPH ALSO HAIL IS POSSIBLE. SOME LOCAL STREET AND HIGHWAY
FLOODING IS LIKELY WITH THIS STORM. MOTORIST SHOULD USE EXTREME
CAUTION. BOATERS ALONG THE ATLANTIC COAST SOUTH OF INDIAN RIVER INLET
SHOULD BE ALERT FOR AND AVOID THIS STORM.
 
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.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUIL<DING BUT STAY AWAY FROM WINDOWS.
CKD

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 4:42 PM EDTSevere Thunderstorm WarningILMKent, New Castle2 hr
Jul 5, 5:07 PM EDTFlash Flood WarningILMNew Castle2 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.