Alert archive / Florida / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 41, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 21, 2000, 2:38 PM EDT for Polk County, Florida. It was in force for 37 min. 2 reports 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
- Jul 21, 2000, 2:38 PM EDT (18:38 UTC)
- Expired
- Jul 21, 2000, 3:15 PM EDT
- In force
- 37 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Polk County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 21, 2:40 PM EDT | Hail 0.88 | Lake Alfred, FL | The public reported, through WTVT-TV of Tampa, nickel sized hail near the intersection of U.S. Highways 92 and 17 in Lake Alfred of northern Polk county. |
| Jul 21, 2:50 PM EDT | Thunderstorm Wind | Lake Alfred, FL | Polk County Emergency Management reported that thunderstorm winds downed several large trees and a few power poles along County Road 557 in Lake Alfred to State Road 60 in Bartow. |
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, 6.6 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
- 3275 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 47 m²/s²
- 0-3 km storm-relative helicity
- 33 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
863 WUUS52 KTBW 211839 SVRTBW FLC105-211915- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 238 PM EDT FRI JUL 21 2000 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN POLK COUNTY. * UNTIL 315 PM EDT. * AT 238 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS...OVER AUBURNDALE...MOVING NORTH AT 20 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT... LAKE ALFRED. 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 2809 8182 2811 8164 2826 8163 2832 8180 88 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 Jul 21, 1:37 PM EDT, 1 hour 1 minute earlier.
Area forecast discussion, Jul 21, 1:37 PM EDT, 1 hour 1 minute before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 137 PM EDT FRI JUL 21 2000 ACTION FIRING QUICKLY AS EXPECTED...AND MORE WIDESPREAD ACTIVITY BY MID AFTERNOON...SO WILL KEEP THIS BRIEF. UNSETTLED IS THE WATCHWORD FOR THE WEEKEND. FALLING HEIGHTS FROM THE MIDWEST THROUGH THE CENTRAL GULF WILL ALLOW PERSISTENT SHORT WAVE(S) AND/OR SHEAR AXIS TO REMAIN ACROSS THE PENINSULA RIGHT THROUGH THE WEEKEND. IRONICALLY...ALL MODELS ARE CONSISTENT ON THIS BIG PICTURE...WHICH (HOPEFULLY) WILL MAKE THIS A GOOD FORECAST PACKAGE. IN A NUTSHELL...PLENTY OF CLOUDS...SCT TO NUMEROUS SHOWERS AND TSTMS...AND CONTINUED MUGGY (BUT WITH LOWER HEAT INDICES GIVEN MORE CLOUD COVER). POPS NOT REALLY A FACTOR...RANGING FROM THE HIGH CHC (SCT) RANGE TO THE LOW LIKELY RANGE. ULTIMATELY...AN MCS (OR TWO) IS POSSIBLE...BUT IT'S FAR TOO EARLY TO SPECULATE ON WHEN AND WHERE. THE FCST: TONIGHT...ALL MODELS LEAVE SHEAR AXIS AND ABUNDANT MEAN RH ACROSS THE CWFA. THE TREND IS TO DRIFT THE BEST LIFT/RH INTO THE GULF OVERNIGHT. FOR THIS REASON...AND GIVEN CONTINUED SW LOW LVL FLOW...WILL NOT TIME PCPN HERE. FOR INLAND AREAS...MOST ACTION WILL BE THIS EVENING...BUT COULD WELL LAST TOWARD MIDNIGHT. SAT...THE MEAN GUIDANCE NUMBERS GIVE 60 POP INTERIOR...AND 50 POP COAST. WITH SHEAR AXIS IN PLACE...OLD BOUNDARIES...AND A HINT OF BETTER SEA BREEZE COLLISION AS LOW LVL FLOW BECOMES A SHADE MORE SOUTHERLY...LIKELY POPS OVER INTERIOR PORTIONS IS PLAUSIBLE. CERTAINLY...THIS COULD BE THE CASE EVERYWHERE BUT WILL DEFER TO THE NEXT SHIFT TO MAKE FINAL DETERMINATION. SAT NIGHT...SHEAR AXIS GETS "ACTIVATED" BY UPSTREAM ACTIVITY... WHICH FURTHER DEEPENS THE TROUGH. IN ADDITION...SW FLOW MAY STRENGTHEN A TAD. WILL CONTINUE 50 POP (NO TIMING) ON THE COAST... MAINLY EVENING INLAND. SUN...ONCE AGAIN...STRAIGHT MODEL SOLNS ARGUE FOR LIKELY POPS EVERYWHERE. BUT...MODEL SOLNS ARE ALWAYS APT TO CHANGE. WILL FCST CLIMO (50) EVERYWHERE. FOR CLOUDS...VRBL CLOUDS CERTAINLY A GOOD BET WITH THIS PATTERN... PERHAPS A BIT LESS OVER INTERIOR PORTIONS OVERNIGHT. FOR TEMPS... CLIMO DURING THE DAY...A SMIDGE WARMER (MU 70S) AT NIGHT. MARINE: NOTHING DIFFICULT HERE. AVG WINDS GENERALLY 5 TO 10 KNOTS...HIGHER IN TSTMS. DIRECTION SW...PERHAPS A BIT MORE S BY SUN NIGHT. FIRE WX: COMBINATION OF SHOWERS AND HIGH RH MEANS NO RED FLAG CONDITIONS. PRELIM NUMBERS: TPA TT 077/091/077/091 5555 FMY TT 076/091/076/091 4545 88 .TBW...NONE. GOLDSMITH
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 5:07 PM EDT | Severe Thunderstorm Warning | TBW | Hillsborough | 23 min |
| Jul 21, 5:08 PM EDT | Severe Thunderstorm Warning | TBW | Hillsborough | 37 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2000Every severe thunderstorm warning in 2000
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.