Alert archive / Florida / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 11, NWS Melbourne, FL

April 23, 1991Flagler County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Apr 23, 1991, 9:28 AM EDT for Flagler County, Florida. It was in force for 62 min.

The area

The counties it named.

The facts

Issued
Apr 23, 1991, 9:28 AM EDT (13:28 UTC)
Expired
Apr 23, 1991, 10:30 AM EDT
In force
62 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Flagler County, FL

The nearest sounding before it

Jacksonville, FL (KAYS), launched 12:00Z, 1.5 hours before the alert went out and 121 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, Jacksonville, FL at 12:00Z on 1991-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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, Jacksonville, FL at 12:00Z on 1991-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 square meters per square second.19395878Sfc1 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
3 J/kg
Mixed-layer CIN
-339 J/kg
Mixed-layer LCL
712 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Apr 23, 9:11 AM EDT, 17 minutes before
FLZ012-231430-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
910 AM EDT TUE APR 23 1991

VERY STRONG THUNDERSTORMS WERE CLUSTERED IN PUTNAM COUNTY AND
MOVING VERY RAPIDLY TOWARD THE NORTHWEST AND NORTH HALF OF FLAGLER.
COUNTY AND WILL ENTER FLAGLER COUNTY DURING THE NEXT 30 MINUTES.

THESE VERY STRONG THUNDERSTORMS WERE MOVING EAST AND A LITTLE SOUTH
OF EAST AT 40 MPH AND ARE CAPABLE OF PRDUCING VERY STRONG AND GUSTY
WIND...VERY HEAVY DOWNPOURS...FREQUENT DEADLY LIGHTNING STRIKES AND
HAIL.

RESIDENTS OF FLAGLER COUNTY...ESPECIALLY...THE NORTH HALF SHOULD
PREPARE FOR THESE STRONG STORMS AS THEY CROSS THE COUNTY DURING
THE NEXT 1 TO 2 HOURS. MARINE OPERATORS SHOULD SEEK SAFE HARBOR.

WARNINGS ARE LIKEY WITH THESE STORMS DURING THIS HOUR.

The office that day

Everything else NWS Melbourne, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 9:57 AM EDTTornado WarningMLBFlagler48 min
Apr 23, 12:24 PM EDTSevere Thunderstorm WarningMLBLake66 min
Apr 23, 4:01 PM EDTSevere Thunderstorm WarningMLBBrevard29 min
Apr 23, 4:31 PM EDTSevere Thunderstorm WarningMLBBrevard29 min

Nearby

Severe Thunderstorm Warnings in Florida, 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.