Alert archive / Florida / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 120, NWS Melbourne, FL

August 25, 2001Osceola County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Aug 25, 2001, 5:18 PM EDT for Osceola County, Florida. It was in force for 57 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Aug 25, 2001, 5:18 PM EDT (21:18 UTC)
Expired
Aug 25, 2001, 6:15 PM EDT
In force
57 min
Issued by
NWS Melbourne, FL
Area
Whole counties

County Osceola County, FL

The radar

The Melbourne radar (KMLB), 49 km from the middle of the area, began a volume at 21:19 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.

What was reported inside it

TimeReportWhereRemark
Aug 25, 6:00 PM EDTThunderstorm Wind 50 ESt Cloud, FLThunderstorm winds blew down trees and power lines near St. Cloud.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 9.3 hours before the alert went out and 78 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, Cape Canaveral, FL at 12:00Z on 2001-08-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Cape Canaveral, FL at 12:00Z on 2001-08-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -29 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1353 m above ground
0-6 km bulk shear
7 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
0.0

Open this sounding in Storm Lab

The text

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

401 
WUUS52 KMLB 252121
SVRMLB
FLC097-252215-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
518 PM EDT SAT AUG 25 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  OSCEOLA COUNTY
  IN EAST CENTRAL FLORIDA

* UNTIL 615 PM EDT.

* AT 515 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  SEVERE THUNDERSTORM NEAR NARCOOSSEE...MOVING SOUTHEAST AT 20 MPH.

* IN ADDITION...ANOTHER STRONG TO SEVERE THUNDERSTORM WILL DEVELOP   
  JUST WEST OF HOLOPAW THROUGH 430 PM.

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.

$$

LAT...LON 2843 8117 2835 8136 2773 8108 2785 8081

MJG

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 Aug 25, 1:50 PM EDT, 3 hours 28 minutes earlier.

Area forecast discussion, Aug 25, 1:50 PM EDT, 3 hours 28 minutes before
EAST CENTRAL FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
150 PM EDT SAT AUG 25 2001

CURRENTLY/THIS EVENING...LATE DEVELOPING CUMULUS INDICATE THAT DEEP
MOISTURE STILL WAS LACKING.  WEAK BOUNDARY EVIDENT JUST NORTH OF THE
COASTAL WATERS DROPPING SOUTHWARD.  MODELS SHOW THIS BOUNDARY
HANGING UP VICINITY OF BIG BEND BUT DROPPING SOUTHWARD OFFSHORE AND
ALONG THE COAST.  PRECIPITABLE WATER FORECASTS SUGGEST MORE THAN
SLIGHT CHANCE MOS POPS...BUT WITH WEAK INSTABILITY WILL PROBABLY
JUST GO WITH 20 PERCENT EVERYWHERE.

SUNDAY...WEAK SURFACE LOW NORTHEAST OF THE AREA WILL CONTINUE TO
PUSH AWAY. WEAK BUBBLE HIGH BUILDING BEHIND IT WILL PROVIDE FOR
LIGHT NORTH BECOMING NORTHEAST FLOW.  MID/UPPER TROUGH AXIS WILL
PUSH EAST SOUTHEAST OF THE AREA WITH MODELS GENERALLY SHOWING SOME
DRYING...ETA BEING THE MOST EMPHATIC.  THINK THAT BEST LOW LEVEL
CONVERGENCE WILL BE OVER THE INTERIOR LATE IN THE AFTERNOON SO WILL
CONTINUE THE CURRENT NO POP FORECAST ALONG THE COAST AND SLIGHT
CHANCE OVER THE INTERIOR AND SOUTH COAST.

MONDAY...TROUGH MOVING TOWARDS THE EASTERN SEABOARD WILL LIFT OUT
THE WEAK LOW...WHICH WILL ALLOW LOW LEVEL ATLANTIC RIDGE TO TRY TO
BUILD BACK ACROSS THE PENINSULA.  ASSOCIATED SURFACE TROUGH WILL NOT
ALLOW THIS TO OCCUR WITH MUCH VIGOR HOWEVER.  MOISTURE CONTINUES TO
LOOK MARGINAL...SO EXPECT THAT INLAND AREAS WILL CONTINUE TO BE THE
FAVORED SPOT FOR AFTERNOON STORMS.

EXTENDED...LOOKED AT A 2 RUN COMPARISON OF THE MRF AND THINGS SEEMED
RATHER SIMILAR.  ACTIVE LOW NEAR THE ALEUTIANS CONTINUES TO PUMP OUT
SHORTWAVES THAT TRAVERSE THE WEST COAST RIDGE THEN DIG INTO THE
EASTERN PART OF THE COUNTRY.  THIS WILL KEEP SURFACE RIDGE AXIS FROM
PUSHING VERY FAR NORTH OF THE AREA. THERE MAY BE A BRIEF WINDOW
WHERE SOUTHERN COASTAL SECTIONS HAVE SOME ATLANTIC SHOWERS MOVE
ASHORE OVERNIGHT...OTHERWISE CONVECTION SHOULD FAVOR THE DAYTIME.
BUILDING 500 MB RIDGE ACROSS THE AREA MAY CONTINUE THE BELOW NORMAL
RAINFALL TREND MUCH OF NEXT WEEK.

MARINE...NOT A LOT GOING ON RIGHT NOW OVER THE WATERS...AS THEY TOO
WERE QUITE FREE OF CLOUDS.  BOUNDARY WILL BE PUSHING ACROSS THE
NORTH LEG THE REST OF THE AFTERNOON AND INTO SOUTHERN SECTIONS
DURING THE EVENING.  MODELS NOT SHOWING ANYTHING OVER 10 KNOTS
THROUGH SUNDAY ...EXCEPT FOR THE AVN.  THEREAFTER...HIGH PRESSURE
RIDGE WILL GRADUALLY BECOME ESTABLISHED ACROSS THE SOUTHERN
PENINSULA MONDAY...THEN BUILD TO THE CENTRAL PENINSULA TUESDAY...AND
POSSIBLY JUST NORTH OF THE WATERS BY THURSDAY.  PROXIMITY OF THIS
RIDGE SUGGESTS 10 KNOT OR LESS FLOW.  LATEST WAVE WATCH MODEL
SHOWING INCREASED SEAS SUNDAY DUE TO NORTHEAST SWELLS...WHICH THEN
DAMPEN OUT QUICKLY EARLY NEXT WEEK.

DAB UB 070/089 070/090 071 1112
MCO BB 071/093 071/093 073 1213
MLB UB 072/089 072/089 073 1112

.MLB...NONE.

PUBLIC/MARINE...LASCODY
AVIATION/FIRE WX...WIMMER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 4:57 PM EDTSevere Thunderstorm WarningMLBOrange63 min
Aug 25, 6:35 PM EDTSevere Thunderstorm WarningMLBIndian River40 min

Nearby

Severe Thunderstorm Warnings in Florida, 2001Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.