Alert archive / Florida / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 9, NWS Melbourne, FL

February 22, 1993Volusia County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Feb 22, 1993, 2:10 PM EST for Volusia County, Florida. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Feb 22, 1993, 2:10 PM EST (19:10 UTC)
Expired
Feb 22, 1993, 3:15 PM EST
In force
65 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Volusia County, FL

The radar

The Melbourne radar (KMLB), 116 km from the middle of the area, began a volume at 19:13 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

Jacksonville, FL (KAYS), launched 12:00Z, 7.2 hours before the alert went out and 168 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 1993-02-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 926 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 1993-02-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939587897Sfc1 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
926 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
548 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
29 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 KDAB 221911
SVRDAB
FLC127-222015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
210 PM EST MON FEB 22 1993
 
THE NATIONAL WEATHER SERVICE IN DAYTONA BEACH HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  315 PM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN EAST CENTRAL FLORIDA
 
   ...VOLUSIA COUNTY...
 
AND THE ADJACENT COASTAL WATERS.
 
A LINE OF SEVERE THUNDERSTORMS STRETCHED FROM JUST SOUTHWEST OF
DAYTONA BEACH INLAND TO DELTONA AND SANFORD.
 
THE THUNDERSTORMS WERE MOVING RAPIDLY EAST AT 45 MPH.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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, Feb 22, 11:05 AM EST, 3 hours 5 minutes before
FLZ012-221730-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
1105 AM EST MON FEB 22 1993

     ...STRONG THUNDERSTORMS MOVING THROUGH FLAGLER COUNTY...
STRONG THUNDERSTORMS WERE LOCATED ACROSS FLAGLER COUNTY FROM JUST WEST
OF MARINELAND TO BUNNELL AND WERE RAPIDLY EAST 45 MPH AND WILL REACH
THE ATLANTIC COASTAL WATERS IN LESS THAN 30 MINUTES. A SPECIAL MARINE
WARNING WILL BE ISSUED.

THESE STRONG THUNDERSTORMS ARE CAPABLE OF PRODUCING STRONG AND GUSTY
WIND...VERY HEAVY RAINFALL...POSSIBLE HAIL AND DANGEROUS LIGHTNING.

ADDITIONAL THUNDERSTORMS...SOME STRONG WITH VERY HEAVY RAIN...WILL
AFFECT THE FLAGLER AND VOLUSIA COUNTY AREA DURING THE MAJOR PART OF
THIS AFTERNOON.
Special weather statement, Feb 22, 12:12 PM EST, 1 hour 58 minutes before
FLZ017-011-016-221815-

SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE
NATIONAL WEATHER SERVICE MELBOURNE FL
1210 PM EST MON FEB 22 1993

...SEVERE THUNDERSTORM WATCH FOR EAST CENTRAL FLORIDA UNTIL 7 PM...

AT 1210 PM...A LINE OF STRONG THUNDERSTORMS EXTENDED FROM ABOUT
FLAGLER BEACH ACROSS LAKE GEORGE TO THE WEST COAST BETWEEN CRYSTAL
RIVER AND NEW PORT RICHEY. THUNDERSTORMS WERE MOVING EAST AT 40 MPH
...WHILE THE LINE WAS SLIDING SOUTHEAST AT ABOUT 10 MPH.

THE OUTLOOK THROUGH 2 PM...THIS LINE OF STORMS SHOULD AFFECT AREAS
FROM AROUND DAYTONA BEACH ACROSS THE OCALA NATIONAL FOREST TO
LEESBURG.

A SEVERE THUNDERSTORM WATCH MEAN CONDITIONS ARE FAVORABLE FOR
DAMAGING WINDS AND HAIL IN SO~ME OF THE THUNDERSTORMS. PEOPLE SHOULD
KEEP ABREAST OF THE LATEST STATEMENTS AND POSSIBLE WARNINGS AS THE LINE
OF THUNDERSTORMS MOVES ACROSS EAST CENTRAL FLORIDA.
Special weather statement, Feb 22, 1:20 PM EST, 50 minutes before
FLZ011-016-017-221915

SPECIAL EAST CENTRAL FLORIDA WEATHER UPDATE
NATIONAL WEATHER SERVICE MELBOURNE FL
115 PM EST MON FEB 22 1993

...STRONG THUNDERSTORMS BEGINNING TO AFFECT LAKE COUNTY...

AT 115 PM...A LINE OF THUNDERSTORMS EXTENDED FROM NEAR ORMOND BEACH ACROSS THE
OCALA NATIONAL FOREST TO NEAR LEESBURG. THE THUNDERSTORMS WERE MOVING
NORTHEAST AT 40 TO 45 MPH WHILE THE LINE WAS MOVING SOUTHEAST AT ABOUT 10 MPH.
THE THUNDERSTORMS WITH THE HEAVIEST RAIN AT THIS TIME WERE FROM AROUND
UMATILLA TO SOUTHWEST OF LEESBURG.

THOSE ACROSS LAKE COUNTY SHOULD BE ESPECIALLY ALERT DURING THE NEXT HOUR OR SO
AS THESE THUNDERSTORMS MOVE RAPIDLY THROUGH.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNPTIL 7 PM...THEREFORE PEOPLE ACROSS
ALL OF EAST CENTRAL FLORIDA SHOULD BE ALERT FOR THREATENING WEATHER AS THIS
LINE OF THUNDERSTORMS SLIDES SOUTHEASTWARD ACROSS THE AREA.
Special weather statement, Feb 22, 1:31 PM EST, 39 minutes before
FLZ006>017-020-221930-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE DAYTONA BEACH FL
130 PM EST MON FEB 22 1993

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PARTS OF CENTRAL
FLORIDA AND THE ADJACENT COASTAL WATERS UNTIL 700 PM...AND
INCLUDES VOLUSIA COUNTY...

STRONG THUNDERSTORMS CONTINUED OVER CENTRAL FLORIDA...REACHING
FROM THE EAST COAST JUST NORTH OF DAYTONA BEACH...INTO THE
INTERIOR AROUND LEESBURG...AND CONTINUING TO THE GULF COAST
NORTH OF TAMPA.

THESE THUNDERSTORMS ALSO EXTENDED NORTHEAST OVER THE COASTAL AND
OFFSHORE WATERS BETWEEN DAYTONA BEACH AND MARINELAND.

THE HEAVIEST RAINFALL WAS OVER THE INTERIOR JUST EAST OF LEESBURG.

THESE THUNDERSTORMS WERE INCLUDED IN A LARGE AREA OF RAIN THAT
COVERED A GOOD PART OF NORTH FLORIDA.

THUNDERSTORMS HAVE DEVELOPED FARTHER SOUTH ALONG THE EAST COAST
BETWEEN VERO BEACH AND MELBOURNE.

THE THUNDERSTORMS WERE MOVING RAPIDLY EAST AT 45 MPH...WHILE THE
RAIN AREA WAS SLIPPING SOUTHEAST INTO THE CENTRAL PART OF THE
FLORIDA PENINUSLA AT 10 MPH.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA.  PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 22, 1:22 PM ESTSevere Thunderstorm WarningMLBLake68 min
Feb 22, 1:54 PM ESTSevere Thunderstorm WarningMLBOrange, Seminole66 min
Feb 22, 5:36 PM ESTSevere Thunderstorm WarningMLBMartin, Saint Lucie54 min
Feb 22, 6:00 PM ESTSevere Thunderstorm WarningMLBOkeechobee45 min
Feb 22, 6:46 PM ESTSevere Thunderstorm WarningMLBMartin, Okeechobee, Saint Lucie44 min

Nearby

Severe Thunderstorm Warnings in Florida, 1993Every severe thunderstorm warning in 1993

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.