Alert archive / Florida / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 12, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Mar 21, 2003, 10:20 AM EST for Hillsborough County, Florida. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Mar 21, 2003, 10:20 AM EST (15:20 UTC)
- Expired
- Mar 21, 2003, 11:00 AM EST
- In force
- 40 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Counties, with a storm outline in the text
County Hillsborough County, FL
The radar
The Tampa radar (KTBW), 23 km from the middle of the area, began a volume at 15:21 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 3.3 hours before the alert went out and 23 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
- 1275 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 506 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 4.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS52 KTBW 211520 SVRTBW FLC057-211600- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 1020 AM EST FRI MAR 21 2003 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL HILLSBOROUGH COUNTY IN FLORIDA. * UNTIL 1100 AM EST * AT 1020 AM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH DAMAGING WINDS...9 MILES SOUTH OF TAMPA... MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL AFFECT... GIBSONTON BY 1020 AM EST. PALM RIVER CLAIR MEL BY 1030 AM EST. EAST LAKE ORIENT PARK BY 1035 AM EST. BRANDON BY 1040 AM EST. MANGO BY 1045 AM EST. SEFFNER BY 1050 AM EST. MOVE INSIDE A STURDY BUILDING. DAMAGING WIND...LARGE HAIL... TORRENTIAL RAIN...AND DEADLY LIGHTNING ARE EXPECTED. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. && LAT...LON 2789 8257 2776 8243 2792 8215 2810 8230 $$ 57
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 Mar 21, 9:04 AM EST, 1 hour 16 minutes earlier.
Area forecast discussion, Mar 21, 9:04 AM EST, 1 hour 16 minutes before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 904 AM EST FRI MAR 21 2003 FRONT THROUGH NORTHERN COUNTIES ALREADY WILL PROMPT SOME ADDITIONAL CHANGES TO THE ZONES THIS MORNING. POPS LOOK ISOLATED AT BEST THIS AFTERNOON FOR THE NORTHERN COUNTIES...AND WILL LOWER POPS APPROPRIATELY THERE. I WILL ALSO VEER THE WIND DIRECTION AS FRONT WILL BE PASSED. ELSEWHERE...MOISTURE AND INSTABILITY POOLING WILL CONTINUE ALONG THE FRONT THROUGH THE DAY WITH SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS...SLOWLY DIMINISHING IN COVERAGE AS THE DAY WEARS ON... ESPECIALLY NEAR THE COAST WHERE CONVERGENCE SHOULD WEAKEN. MARINE: WILL SHIFT WINDS AROUND FOR THE NORTHERN LEG THIS AFTERNOON TO A WESTERLY DIRECTION...WHICH IS REALLY MORE OF AN AVERAGE OF THE VARIABLE NORTHWEST TO SOUTHWEST IT SHOULD BE. .TBW...NONE. ALSHEIMER
Hazardous weather outlook, Mar 21, 5:00 AM EST, 5 hours 20 minutes before
FLZ039-042-043-048>052-055>057-060>062-065-211530- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 500 AM EST FRI MAR 21 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST CENTRAL AND SOUTHWEST FLORIDA. .DAY ONE...TODAY: ...ISOLATED STRONG THUNDERSTORMS POSSIBLE TODAY... A WEAK COLD FRONT WILL APPROACH THE AREA SLOWLY FROM THE NORTH TODAY...WHICH COMBINED WITH SOME UPPER LEVEL ENERGY...WILL ALLOW FOR SCATTERED SHOWERS AND THUNDERSTORMS. SHOWERS AND THUNDERSTORMS WILL MOVE TOWARD THE NORTHEAST AT 20 TO 25 MPH. ATMOSPHERIC CONDITIONS ARE FAVORABLE FOR SOME STORMS TO BECOME STRONG... ESPECIALLY OVER INTERIOR LOCATIONS THIS AFTERNOON. ANY STORMS THAT DO BECOME STRONG COULD PRODUCE GUSTY WINDS OF 30 TO 40 MPH...BRIEF HEAVY DOWNPOURS...AND FREQUENT CLOUD TO GROUND LIGHTNING. FOR MARINE INTERESTS...CONDITIONS WILL BE FAVORABLE THROUGH THIS MORNING FOR ISOLATED WATERSPOUTS...ESPECIALLY WITHIN 10 MILES OF THE COAST. BE PREPARED TO SEEK SAFE HARBOR IF THREATENING WEATHER APPROACHES. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY: HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .SPOTTER CALL TO ACTION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED. FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT HTTP://WWW.SRH.NOAA.GOV/TBW MORALES
In the hours before
Special weather statement, Mar 21, 9:28 AM EST, 52 minutes before
FLZ050-211515- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 928 AM EST FRI MAR 21 2003 ...STRONG THUNDERSTORMS WILL AFFECT SOUTHERN PINELLAS COUNTY... A LINE OF THUNDERSTORMS...MOVING NORTHEAST AT 30 MPH...WILL AFFECT PINELLAS PARK...SEMINOLE AND SAINT PETERSBURG...UNTIL 1015 AM EST. GUSTY WINDS UP TO 50 MPH MAY CAUSE LOOSE OBJECTS TO BLOW AROUND. SOME DAMAGE TO TREE LIMBS AND WIRES IS POSSIBLE.
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 21, 9:20 AM EST | Special Marine Warning | TBW | 55 min | |
| Mar 21, 10:19 AM EST | Special Marine Warning | TBW | 26 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2003Every severe thunderstorm warning in 2003
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.