Alert archive / Florida / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 101, NWS Melbourne, FL

July 13, 1999Lake County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jul 13, 1999, 5:06 PM EDT for Lake County, Florida. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 13, 1999, 5:06 PM EDT (21:06 UTC)
Expired: Jul 13, 1999, 5:55 PM EDT
In force: 49 min
Issued by: NWS Melbourne, FL
Area: Whole counties

County Lake County, FL

The radar

The Melbourne radar (KMLB), 126 km from the middle of the area, began a volume at 21:06 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 (KJAX), launched 12:00Z, 9.1 hours before the alert went out and 193 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: 5 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 1336 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 78 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 KMLB 132109 RRA
SVRMLB
FLC069-132155-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
506 PM EDT TUE JUL 13 1999

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

     LAKE COUNTY IN EAST CENTRAL FLORIDA

* UNTIL 555 PM EDT

* AT 500 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM NEAR PAISLEY. MOVEMENT WAS NEARLY STATIONARY.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HIGHWAY 42 BETWEEN PAISLEY AND THE SAINT JOHNS RIVER THROUGH
  530 PM

ANOTHER STRONG STORM WAS DEVELOPING NEAR MOUNT PLYMOUTH.


SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 58
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING AND VERY HEAVY RAIN.
MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STRONG BUILDING.


CRISTALDI

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.

NWS Melbourne, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 13, 2:30 PM EDT, 2 hours 36 minutes earlier.

Area forecast discussion, Jul 13, 2:30 PM EDT, 2 hours 36 minutes before

EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
230 PM EDT TUE JUL 13 1999

PRECIPITATION GETTING OFF TO A LATE START THIS AFTERNOON WITH BULK
OF CONVECTION YET TO OCCUR. SEA BREEZE MERGER OVER CENTRAL FL
WILL SIGNAL A FEW STRONG STORMS LATER THIS AFTERNOON. SUBSIDENCE AND
DRY AIR OVER THE IMMEDIATE ATLANTIC WATERS WILL MOVE ASHORE IN THE
WAKE OF THE SEABREEZE ...CLEARING COASTAL COUNTIES SOUTH OF VOLUSIA
FROM ANY PRECIPITATION THE REST OF TODAY.

TONIGHT...SYNOPTIC LOW LEVEL WINDS TO BECOME MORE SLY AS HIGH
PRESSURE RIDGE OVER THE STATE BROADENS. AFTER DISSIPATION OF EVENING
DEBRIS CLOUDS...OVERALL HIGH CLOUD COVERAGE SHOULD BE SPARSE.
POCKETS OF GROUND FOG LIKELY AGAIN BY SUNRISE AS WINDS AREA WIDE
DROP TO NEAR CALM BY MIDNIGHT.

WEDNESDAY-THURSDAY NIGHT...DEEP LAYER RIDGE AXIS RETREATS
NORTHWARD...REACHING S GA THURSDAY. LOW-MID LEVEL FLOW AROUND BROAD
RIDGE WILL RESULT IN GENERAL SOUTHERLY STEERING WINDS WED AFTERNOON.
THUS...BOTH EAST AND WEST COAST BOUNDARIES SHOULD BE SLOW TO MOVE
INLAND. POSITION OF RIDGE AXIS SHOULD STILL ALLOW GREATEST INLAND
PENETRATION BY WEST COAST BREEZE AND ASSOCIATED CONVECTIVE OUTFLOWS NORTH
OF MCO-TTS BY LATE IN THE DAY. ALTHOUGH MOISTURE DEPTH WILL INCH
UPWARD...EXPECT LESS CONVERGENCE BETWEEN BREEZE BOUNDARIES THAN
RECENT DAYS AND THUS ONLY SCATTERED COVERAGE OF STORMS. DEEPENING
E/SE FLOW WILL RETURN THU. EXPECT CONTINUED SCATTERED COVERAGE OF
STORMS ALTHOUGH DISTRIBUTION WILL FAVOR INTERIOR COUNTIES DURING THE
EARLY-MID AFTERNOON THEN AFFECTING TBW CWA BY SUNSET. TEMPS CLOSE TO
NORMAL.

FRIDAY-SUNDAY...WILL RIDGE AXIS REMAINING WELL TO THE NORTH...DEEP
E/SE FLOW WILL PREVAIL. LACK OF PRONOUCED MOISTURE SOURCES/DISTURBANCES
UPSTREAM OVER ATLANTIC/CARRIB SHOULD HOLD PRECIP CHANCES NEAR/BELOW
CLIMO. GIVEN FLOW REGIME...EXPECT SOME SHOWERS/STORMS THROUGH EARLY
AFTERNOON OVER COASTAL COUNTIES...WITH HIGHEST COVERAGE INLAND
DURING THE EARLY-MID AFTERNOON. DONT EXPECT GRADIENT FLOW TO BE
STRONG ENOUGH TO WARRANT NOCTURAL RAIN CHANCES AT THIS TIME. TEMPS
NEAR CLIMO.

MARINE...NO HIGHLIGHTS. AFTER ONE MORE DAY OF WEAK SOUTHERLY
GRADIENT WITH PM SEA BREEZES...TRANSITION TO E/SE FLOW WILL OCCUR.
SCATTERED SHOWERS/STORMS OVER PENINSULA MAY AFFECT NEAR SHORE WATERS
N OF MLB THROUGH MID EVENING TONIGHT.

DAB TB 074/090 073/090 073 65353
MCO TB 072/092 073/092 072 65353
MLB BB 071/090 074/089 075 65143

.MLB...NONE.

PENDERGRAST/SPRATT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 5:14 PM EDT	Severe Thunderstorm Warning	MLB	Orange	61 min

Nearby

Severe Thunderstorm Warnings in Florida, 1999 Every severe thunderstorm warning in 1999

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.