Alert archive / Florida / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 134, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Aug 18, 2001, 4:05 PM EDT for Polk County, Florida. It was in force for 25 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 18, 2001, 4:05 PM EDT (20:05 UTC)
- Expired
- Aug 18, 2001, 4:30 PM EDT
- In force
- 25 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Polk County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 18, 4:10 PM EDT | Thunderstorm Wind | Lakeland, FL | A Skywarn Spotter reported that thunderstorm winds uprooted several large trees south of the intersection of U.S. Highway 98 and Rock Ridge Road. |
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
Tampa Bay, FL (KTBW), launched 12:00Z, 8.1 hours before the alert went out and 74 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.
- Mixed-layer CAPE
- 2466 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 764 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
419 WUUS52 KTBW 182006 SVRTBW FLC105-182030- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 405 PM EDT SAT AUG 18 2001 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHWESTERN POLK COUNTY IN FLORIDA. * UNTIL 430 PM EDT. * AT 405 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL...OVER NORTHWESTERN POLK COUNTY...MOVING NORTHEAST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT... RURAL AREAS NORTH OF KATHLEEN AND ALONG HIGHWAY 98. SEVERE THUNDERSTORMS CONTAIN WIND GUSTS OF 60 MPH OR HIGHER...AND HAIL THE SIZE OF DIMES OR LARGER. MOVE TO A PLACE OF SAFETY. $$ LAT...LON 2824 8211 2805 8197 2824 8188 2831 8201 33 NNNN
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 Tampa Bay, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 2:05 PM EDT, 2 hours earlier.
Area forecast discussion, Aug 18, 2:05 PM EDT, 2 hours before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 205 PM EDT SAT AUG 18 2001 CURRENTLY...CONVECTION JUST BEGINNING ALONG THE WEST COAST SEA BREEZE. VISIBLE LOOP INDICATES LOW LEVEL RIDGE AXIS OVER THE CENT FA. CONVECTION ALSO FIRING ALONG SEA BREEZE OVER SE FL...AND IS MOVING WNW TOWARD THE SW FA. HEAT INDICES ALREADY NEAR 103...WITH INTERIOR LIKELY TO REACH 105. SLOW STORM MOTIONS AND HIGH PWS SHOULD LEAD TO THE POTENTIAL FOR LOCALLY HEAVY RAINFALL. EXPECT CONVECTION TO PUSH INLAND FROM TPA NORTH BY LATE AFTN/EARLY EVENING. --FCST DISC-- LITTLE CHANGE IN OVER ALL PATTERN THROUGH MON. UPPER TROF DIGS OVER THE EASTERN U.S. THROUGH THE PERIOD...WHICH HELPS TO LOWER MID/UPPER HTS OVER THE FA. ASSOCIATED SFC FRONT/TROF REMAINS WELL NORTH OF THE FA OVER SCENT GA. DESPITE UPPER HTS FALLS...THE SFC RIDGE AXIS SEEMS TO SIT GENERALLY OVER THE CENT FA/PENIN...KEEPING RELATIVELY LIGHT FLOW. AS PREVIOUS FCSTRS HAVE MENTIONED...LOWERING OF MID/UPPER HTS SHOULD LESSEN LARGE SCALE SUBSIDENCE...AND HELP INCREASE CONVECTIVE COVERAGE SUN AND MON. WILL CONTINUE TO TREND POPS SLOWLY UPWARD SUN AND MON...WITH 40-50% SUN...AND 50-60% MON. THIS FITS THE AVN TREND IN POPS...AND IS ALSO CLOSE TO CLIMO. FWC POPS SEEM TOO LOW GIVEN DEEP MOISTURE AND LOWERING UPPER HTS. HUMIDITY LEVELS EXPECTED TO REMAIN HIGH GIVEN LITTLE/NO CHANGE IN AIRMASS. --EXTENDED-- MUCH OF THE EXTENDED PERIOD DEPENDS ON THE FATE OF CHANTAL. USING NHCS LATEST FCST TRACK...PLACES THE SYSTEM SOMEWHERE OVER THE NORTHERN YUCATAN PENINSULA BY LATE MON AND TUES. WILL KEEP FCST VERY CONSERVATIVE FOR NOW...AND HOLD POPS GENERALLY NEAR CLIMO THROUGH SAT. MAIN EFFECTS FOR NOW WILL LIKELY BE IN THE MARINE. --MARINE-- NO PROBLEMS THROUGH THE WEEKEND. GIVEN POTENTIAL UNCERTAINTIES WITH THE TRACK OF CHANTAL...WILL BEGIN TRENDING WINDS AND SEAS UPWARD OVER THE S WATERS MON AND TUE...AND LIKELY ALL AREAS BY LATER TUE AND WED. TOO EARLY TO TELL WHETHER ANY HIGHLIGHTS WILL BE NEEDED. PRELIM S: TPA 078/092 078/090 2435 FMY 077/093 077/091 3546= .TBW...NONE. MORALES
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 4:28 PM EDT | Severe Thunderstorm Warning | TBW | Sarasota | 47 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.