Alert archive / Florida / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 5, NWS Melbourne, FL

March 12, 2003Okeechobee County, Saint Lucie County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Mar 12, 2003, 2:43 PM EST for Okeechobee County, Saint Lucie County, Florida. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 12, 2003, 2:43 PM EST (19:43 UTC)
Expired: Mar 12, 2003, 3:30 PM EST
In force: 47 min
Issued by: NWS Melbourne, FL
Area: Counties, with a storm outline in the text

Counties Okeechobee County, FL, Saint Lucie County, FL

The radar

The Melbourne radar (KMLB), 76 km from the middle of the area, began a volume at 19:54 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

Cape Canaveral, FL (KXMR), launched 12:00Z, 7.7 hours before the alert went out and 117 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 310 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1004 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

622 
WUUS52 KMLB 121943
SVRMLB
FLC093-111-122030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING FOR HAIL
NATIONAL WEATHER SERVICE MELBOURNE FL
242 PM EST WED MAR 12 2003

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN OKEECHOBEE COUNTY
  WESTERN ST. LUCIE COUNTY
  IN EAST CENTRAL FLORIDA

* UNTIL 330 PM EST

* AT 234 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EXTREME WEST CENTRAL ST. LUCIE COUNTY...OR
  ABOUT 12 MILES SOUTHEAST OF FORT DRUM...MOVING NORTH AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE OVER...
RURAL NORTHWESTERN ST. LUCIE COUNTY AND RURAL NORTHEASTERN 
OKEECHOBEE COUNTY THROUGH 315 PM EST

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 58 MILES AN
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN. IF
THE STORM APPROACHES YOU...MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR.

LARGE HAIL AND EXCESSIVE LIGHTNING ARE LIKELY. TAKE COVER IN A 
STURDY BUILDING UNTIL THE STORM PASSES.

LAT...LON 2735 8077 2733 8057 2757 8055 2756 8076

$$

KELLY

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 9:58 AM EST	Special Marine Warning	MLB		62 min
Mar 12, 3:02 PM EST	Severe Thunderstorm Warning	MLB	Martin	43 min
Mar 12, 3:47 PM EST	Severe Thunderstorm Warning	MLB	Martin	43 min
Mar 12, 4:30 PM EST	Severe Thunderstorm Warning	MLB	Martin	30 min

Nearby

Severe Thunderstorm Warnings in Florida, 2003 Every severe thunderstorm warning in 2003

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.