Alert archive / Florida / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 39, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 20, 2000, 7:13 PM EDT for Polk County, Florida. It was in force for 32 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
- Jul 20, 2000, 7:13 PM EDT (23:13 UTC)
- Expired
- Jul 20, 2000, 7:45 PM EDT
- In force
- 32 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Polk County, FL
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 20, 7:25 PM EDT | Hail 0.75 | Loughman, FL | The public reported dime sized hail in Loughman along U.S. Highway 92 near the Polk-Osceola county line. |
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, 11.2 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
- 3636 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 608 m above ground
- 0-6 km bulk shear
- 2 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS52 KTBW 202314 SVRTBW FLC105-202345- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 713 PM EDT THU JUL 20 2000 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EASTERN POLK COUNTY. * UNTIL 745 PM EDT. * AT 713 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS...OVER EASTERN POLK COUNTY...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT... RURAL EASTERN POLK COUNTY. THIS IS A DANGEROUS STORM! DESTRUCTIVE WIND GUSTS TO 60 MPH WILL CAUSE LOCALLY MAJOR STRUCTURAL DAMAGE. MOBILE HOMES ARE NOT SAFE! TAKE COVER NOW. QUARTER SIZE HAIL IS LIKELY. MOVE INDOORS IMMEDIATELY. $$ LAT...LON 2804 8160 2793 8145 2823 8110 2839 8131 RK 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 20, 2:17 PM EDT, 4 hours 56 minutes earlier.
Area forecast discussion, Jul 20, 2:17 PM EDT, 4 hours 56 minutes before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 217 PM EDT THU JUL 20 2000 LOW LVL SW FLOW WILL CONTINUE TO DOMINATE THIS PACKAGE...AND PROBABLY BEYOND. WITH NO SIG CHANGE TO THE UPPER PATN ACROSS NOAM (STRONG WESTERN U.S. RIDGE...CONTINUED TROFFINESS ACROSS THE E)... THE STATUS QUO IS THE BEST BET. UNFORTUNATELY...COMBINING THIS TYPE OF PATTERN WITH A VERY HUMID LOW LVL AIR MASS MEANS IT'S NEXT TO IMPOSSIBLE TO TIME CONVECTIVE ACTIVITY. IN FACT...THE BEST FORECAST MAY BE A COMBINATION OF PERSISTENCE AND CLIMATOLOGY BLENDED WITH CURRENT OR EXPECTED SHORT TERM CONDITIONS. THE ONE THING WE CAN COUNT ON IS MORE HEAT AND HUMIDITY. HOWEVER... WE REMAIN ON THE CRUX OF TRUE HEAT ADZY CONDITIONS. FOR THE NEXT 24H...EXPECT A VIRTUAL REPEAT OF THE PAST REGARDING AMBIENT AND "FEELS LIKE" TEMPS. SINCE THE ONLY LOCATIONS WHICH MEET THE LOW TEMP CRITERIA ARE ON THE IMMEDIATE COAST AND URBAN CENTERS (ASSUMING NO TSTMS TO KNOCK VALUES DOWN)...WE PREFER TO KEEP HEADLINING AFTN VALUES IN LIEU OF ADZY. THIS ALSO JIBES WITH JAX/MLB/TLH. THE FCST: TONIGHT...STARTING FROM THE COAST...EXPECT ACTIVITY TO CONTINUE TO FIRE NOW (MID AFTN)...BUT DIE BEFORE SUNSET. WILL PROBABLY CARRY A RMDR AFTN/EVE PERIOD...LEAVING THE OVERNIGHT FAIR. THE ONLY EXCEPTION IS THE SW CORNER (SARASOTA CO/S)...WHERE WE'VE SEEN REPEATED SHOTS OF PCPN OVERNIGHT. WILL CARRY AN EVENING POP INTERIOR COS...THEN FAIR. TEMPS GENERALLY 75 TO 80...HIGHEST NEAR THE COAST. FRI...THE BEST GUESS HERE IS THAT LOW LVL SW FLOW WILL PUSH BEST COVERAGE INTO INTERIOR ZONES BY MID AFTN. FORCING REMAINS IN THE FORM OF A SHEAR AXIS...BUT AREA STILL UNDER INFLUENCE OF UPPER RIDGE. FOR NOW...WILL CALL IT CHC POPS CENTRAL/N COAST...SCT PCPN SW THROUGH NE (AS TODAY). FRI NIGHT...ALL MODELS ARE SHOWING SLOW HEIGHT FALLS FROM H50-H85... WITH SW WINDS DEEPENING FROM THE SFC-H85 LAYER. THIS WOULD TEND TO INCREASE NOCTURNAL ACTIVITY...SO WILL PLAY IT SAFE WITH A PTCLDY/30 POP (NO TIMING) ALONG THE COAST...AND SCT RESIDUAL EVE ACTIVITY INLAND. SAT...NO SENSE IN GETTING CUTE HERE. ETA IS MOST PRONOUNCED WITH PENINSULAR MEAN RH...BUT TREND APPEARS TO BE FOR A TEMPORARY WEAKENING OF SW FLOW WHICH WOULD FAVOR AN OVERALL INCREASE IN COVERAGE. WILL GO MIDDLING POPS EVERYWHERE. EXTENDED...MRF SHOWS A CONTINUED TREND FOR DEEPENING SW FLOW IN RESPONSE TO DEVELOPING TROF ACROSS THE LOWER MIDWEST/MS VALLEY REGION. OF COURSE...WE SAW THIS ABOUT A WEEK AGO...AND IT DIDN'T PAN OUT QUITE AS EXPECTED. WILL MODIFY TO GENERIC "CURRENT" PATTERN. MARINE: LOTSA S/SW FLOW...ALL FAIRLY LIGHT (OUTSIDE OF CONVECTION). FIRE WX: HIGH HUMIDITY AND SCT CONVECTION MEANS NO FLAG PROBLEMS. LEVY CO MAY TOUCH 40 PERCENT DUE TO HIGH TEMPS FRI (MU 90S)...BUT THAT'S ABOUT IT. PRELIM NUMBERS... TPA 080/091/078/091 1335 FMY 078/091/077/092 3435 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 20, 7:56 PM EDT | Severe Thunderstorm Warning | TBW | Polk | 24 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.