Alert archive / Delaware / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 21, NWS Wilmington, NC

May 13, 1991Sussex County, Delaware

NWS Wilmington, NC issued this severe thunderstorm warning at May 13, 1991, 7:06 PM EDT for Sussex County, Delaware. It was in force for 39 min.

The area

The counties it named.

The facts

Issued
May 13, 1991, 7:06 PM EDT (23:06 UTC)
Expired
May 13, 1991, 7:45 PM EDT
In force
39 min
Issued by
NWS Wilmington, NC
Area
Whole counties

County Sussex County, DE

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.1 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 1991-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 457 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 1991-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 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
457 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1488 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
-7 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 132308
SVRILG
DEC005-132345-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE WILMINGTON DE
706 PM EDT MON MAY 13 1991
 
THE NATIONAL WEATHER SERVICE IN WILMINGTON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  745 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS......
 
IN SOUTH DELAWARE
 
   ...SUSSEX COUNTY
 
 
A SEVERE THUNDERSTORM WARNING IS IN EFFECT FOR SUSSEX COUNTY.
AS OF 655 PM EDT PATUXENT RIVER RADAR INDICATES A LINE OF STRONG
THUNDERSTORMS EXTENDS FROM DOVER DELAWARE TO DENTON MARYLAND.  THESE
STORMS ARE MOVING TO THE SOUTH SOUTHEAST AROUND 30 MPH.  THESE STORMS
COULD CONTAIN STRONG GUSTY WINDS...DANGEROUS LIGHTNING...HAIL AND SOME
MINOR STREET FLOODING IN LOW LYING AREAS.  STAY TUNED TO NOAA
WEATHER RADIO OR YOUR LOCAL TV AND RADIO FOR MORE INFORMATION ABOUT
THESE STORMS.  A SEVERE THUNDERSTORM IS JUST NORTHWEST OF BRIDGEVILLE
MOVING TO THE SOUTH SOUTHEAST AROUND 30 MPH.
 
THE SEVERE THUNDERSTORM WARNINGS FOR SOUTHERN NEW CASTLE AND NORTHERN
KENT COUNTIES HAVE BEEN CANCELLED.
 
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
STRONG BUILDING.  DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLTY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
 
VAUGHAN

The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 5:42 PM EDTSevere Thunderstorm WarningILMKent, New Castle63 min
May 13, 6:09 PM EDTSevere Thunderstorm WarningILMKent51 min

Nearby

Severe Thunderstorm Warnings in Delaware, 1991Every severe thunderstorm warning in 1991

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.