Alert archive / Florida / Severe Thunderstorm Warnings in 2006
Severe Thunderstorm Warning 9, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 21, 2006, 2:52 PM EDT for Hernando County, Florida. It was in force for 23 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
- Apr 21, 2006, 2:52 PM EDT (18:52 UTC)
- Expired
- Apr 21, 2006, 3:15 PM EDT
- In force
- 23 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Counties, with a storm outline in the text
County Hernando County, FL
The radar
The Tampa radar (KTBW), 94 km from the middle of the area, began a volume at 18:56 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, 6.9 hours before the alert went out and 94 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
- 373 J/kg
- Mixed-layer CIN
- -105 J/kg
- Mixed-layer LCL
- 973 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- -36 m²/s²
- 0-3 km storm-relative helicity
- -20 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 211853 SVRTBW FLC053-211915- /O.NEW.KTBW.SV.W.0009.060421T1852Z-060421T1915Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 252 PM EDT FRI APR 21 2006 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL HERNANDO COUNTY IN FLORIDA. * UNTIL 315 PM EDT * AT 252 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM WITH LARGE HAIL AND DAMAGING WINDS...MOVING INTO BROOKSVILLE. THE STORM WAS DEVELOPING SLOWLY SOUTHWARD. * THE SEVERE THUNDERSTORM WILL AFFECT... BROOKSVILLE. SPRING HILL. SEVERE THUNDERSTORMS CONTAIN WIND GUSTS OF 60 MPH OR HIGHER...AND HAIL THE SIZE OF PENNIES OR LARGER. MOVE TO A PLACE OF SAFETY. NICKEL TO POSSIBLY QUARTER SIZE HAIL IS LIKELY. MOVE INDOORS IMMEDIATELY. && LAT...LON 2860 8250 2850 8257 2847 8245 2855 8234 $$ 88
1 follow-up statement
000 WWUS52 KTBW 211906 SVSTBW SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 304 PM EDT FRI APR 21 2006 FLC053-211915- /O.CON.KTBW.SV.W.0009.000000T0000Z-060421T1915Z/ HERNANDO- 304 PM EDT FRI APR 21 2006 ...A SEVERE THUNDERSTORM WARNING CONTINUES FOR CENTRAL HERNANDO COUNTY UNTIL 315 PM EDT... AT 250 PM EDT...A SKYWARN SPOTTER REPORTED PEA SIZE HAIL FROM A WEAKER THUNDERSTORM IN BEVERLY HILLS...IN NORTHERN CITRUS COUNTY. THE STORM LOCATED NEAR STATE ROAD 50 BETWEEN THE SUNCOAST PARKWAY AND HIGHWAY 19 IS LIKELY PRODUCING MUCH LARGER HAIL. THE STORM IS DEVELOPING SOUTH AT AROUND 5 MPH. THE SEVERE THUNDERSTORM WILL AFFECT... NORTH BROOKSVILLE. BROOKSVILLE. SPRING HILL NORTH OF SPRING HILL DRIVE. THE SEVERE THUNDERSTORM IS ALSO CAPABLE OF PRODUCING... QUARTER SIZE HAIL. 60 MPH WIND GUSTS. EXCESSIVE AND DEADLY CLOUD-TO-GROUND LIGHTNING. MOVE INTO A STURDY BUILDING IMMEDIATELY REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN RUSKIN. && LAT...LON 2860 8250 2850 8257 2847 8245 2855 8234 $$ 88
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 Apr 21, 1:46 PM EDT, 1 hour 6 minutes earlier.
Area forecast discussion, Apr 21, 1:46 PM EDT, 1 hour 6 minutes before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY RUSKIN FL 146 PM EDT FRI APR 21 2006 .SHORT TERM (TNGT-SUN)...MID/UPPER LEVEL RIDGING WILL BE SHIFTING EAST OUT INTO THE ATLANTIC TONIGHT AS THE NEXT SHORTWAVE TROUGH MOVES EAST AND ACROSS THE SOUTHEAST U.S. SATURDAY FOLLOWED BY WEAK RIDGING ON SUNDAY. AT THE SURFACE...A COOL FRONT ASSOCIATED WITH THE TROUGH WILL MOVE ACROSS NORTH FLORIDA SATURDAY AND INTO THE REGION SATURDAY NIGHT BEFORE WASHING OUT ACROSS SOUTH FLORIDA SUNDAY MORNING. FOR TONIGHT...SOUTHWEST TO WEST WINDS WITH THE SEA BREEZE WILL DIMINISH AND BECOME SOUTH TO SOUTHEAST OVERNIGHT. SKIES ARE ONCE AGAIN EXPECTED TO BE MOSTLY CLEAR TO PARTLY CLOUDY WITH SOME LATE NIGHT LOW CLOUDS AND PATCHY FOG POSSIBLE...MAINLY ACROSS THE NATURE COAST. LOW TEMPERATURES WILL BE MAINLY IN THE 60S...EXCEPT AROUND 70 FROM TAMPA BAY SOUTHWARD ALONG THE GULF COAST. ON SATURDAY THE CURRENT FORECAST STILL LOOKS ON TRACK AS MODELS PUSH THE BOUNDARY INTO THE FLORIDA PANHANDLE WITH SOME UPPER LEVEL ENERGY MOVING ACROSS GEORGIA AND NORTH FLORIDA. THIS WOULD KEEP THE BEST CHANCES OF RAIN ACROSS THE NATURE COAST CLOSER TO THE UPPER LEVEL SUPPORT WHILE THE GENERAL SOUTHWEST TO WEST FLOW WOULD FAVOR THE EASTERN HALF OF THE PENINSULA. FOR NOW WILL CONTINUE WITH CURRENT CHANCE POPS ACROSS THE NATURE COAST WITH SLIGHT CHANCE POPS ELSEWHERE. ADDITIONAL CLOUDS AND SOUTHWEST TO WEST FLOW WILL KEEP HIGH TEMPERATURES A LITTLE COOLER THAN TODAY WITH A RANGE FROM THE UPPER 70S TO AROUND 80 ALONG THE GULF COAST TO UPPER 80S INLAND. FOR SATURDAY NIGHT THE UPPER LEVEL ENERGY AND DEEP MOISTURE WILL BE SHIFTING EAST OUT INTO THE ATLANTIC SO JUST EXPECT TO SEE SOME CLOUDS LEFT BEHIND WITH THE BOUNDARY. THE BOUNDARY SHOULD REACH THE INTERSTATE 4 CORRIDOR AROUND SUNRISE WITH WINDS SHIFTING TO THE NORTH BEHIND IT AND RATHER LIGHT AND VARIABLE AHEAD OF IT. ABUNDANT LOW LEVEL MOISTURE ALONG WITH THE BOUNDARY IN THE VICINITY WILL LIKELY LEAD TO SOME AREAS OF LOW CLOUDS AND FOG SATURDAY NIGHT. TEMPERATURES WILL ONCE AGAIN MAINLY FALL INTO THE 60S...EXCEPT AROUND 70 FROM TAMPA BAY SOUTHWARD ALONG THE GULF COAST. ON SUNDAY WEAK HIGH PRESSURE WILL SETUP OVER THE EASTERN GULF AND FLORIDA WITH THE REMNANTS OF THE FRONT STRETCHED WEST TO EAST ACROSS SOUTH FLORIDA. SOME DRIER AIR WILL OVERSPREAD THE NORTHERN AND CENTRAL ZONES UNDER MOSTLY SUNNY SKIES WITH SOME LOW LEVEL MOISTURE LINGERING ACROSS THE SOUTH NEAR THE REMNANTS OF THE FRONT KEEPING SKIES PARTLY CLOUDY WITH AN OUTSIDE CHANCE OF A SHOWER OVER INLAND AREAS ONCE THE SEA BREEZE GETS GOING. FOR NOW WILL LEAVE SILENT 10 POPS IN FOR THE SOUTHERN INLAND SECTIONS. HIGH TEMPERATURES ARE EXPECTED TO RANGE FROM THE UPPER 70S TO AROUND 80 ALONG THE GULF COAST TO NEAR 90 INLAND. .LONG TERM (SUN NGT-FRI)...DRY HIGH PRESSURE IN PLACE ACROSS THE AREA FOR SUNDAY NIGHT THROUGH EARLY WEDNESDAY. MAY HAVE SOME FIRE WEATHER CONCERNS MONDAY AFTERNOON AS THE DRIER AIR FILTERS DOWN THE STATE WITH HIGH PRESSURE BUILDING IN. A WEAKENING COLD FRONT WILL THEN APPROACH THE AREA WEDNESDAY NIGHT. MODELS STILL VARIED ON HOW THEY HANDLE THE FRONT BUT ARE STARTING TO COME INTO BETTER AGREEMENT. LATEST GFS STALLS IT ACROSS NORTH FLORIDA WEDNESDAY AND THEN KEEPS WEAK LOW PRESSURE OVER THE AREA AS UPPER SHORTWAVES MOVE OVER THE STATE THROUGH FRIDAY. DGEX ALSO STALLS THE FRONT ACROSS NORTH FLORIDA BUT NOT UNTIL THURSDAY MORNING...WITH WEAK RIDGING BUILDING IN AS THE UPPER SHORTWAVES MOVE OVER THE AREA. EITHER WAY...RIGHT NOW IT LOOKS LIKE WE WILL HAVE LIMITED MOISTURE AND ENERGY WITH THE STALLING FRONT THURSDAY SO HAVE KEPT POPS AT 10 PERCENT...EXCEPT 20 PERCENT ACROSS THE NORTH WHERE THEY WILL HAVE BEST CHANCES. UPPER LEVEL ENERGY MOVING OVER THE AREA FRIDAY WILL ALLOW FOR SOME ISOLATED STORMS. TEMPERATURES WILL CONTINUE GENERALLY IN THE MID TO UPPER 80S FOR HIGHS AND IN THE MID 50S NORTH TO THE MID 60S ELSEWHERE FOR LOWS. && .MARINE...SOUTH TO SOUTHWEST FLOW TONIGHT WILL BECOME SOUTHWEST TO WEST SATURDAY AHEAD OF THE BOUNDARY AND THEN BECOME RATHER VARIABLE ON SUNDAY WITH STILL A WEST TO NORTHWEST SEA BREEZE EXPECTED NEAR THE COAST DURING THE AFTERNOON. HIGH PRESSURE WILL SETTLE OVER THE AREA EARLY NEXT WEEK WITH RATHER LIGHT AND VARIABLE WINDS WITH A SEA BREEZE DEVELOPING EACH AFTERNOON. IN GENERAL WINDS AND SEAS ARE EXPECTED TO REMAIN BELOW ADVISORY CRITERIA THROUGH THE PERIOD. && .AVIATION...VFR CONDITIONS WILL CONTINUE INTO EARLY TONIGHT. MAY AGAIN SEE SOME LOCAL 3-5 MILE VISIBILITIES IN FOG WITH SOME SCATERRED TO BROKEN LOW CLOUDS TOWARD MORNING SATURDAY...BUT WINDS SHOULD STAY AROUND 5 KNOTS OVERNIGHT AND KEEP THE FOG DEVELOPMENT MORE LOCALIZED THAN IT WAS THIS MORNING. THE LOW CLOUDS AND FOG SHOULD LIFT/BURN OFF SHORTLY AFTER SUNRISE WITH VFR CONDITIONS FOR THE REMAINDER OF THE DAY. && .FIRE WEATHER...NO FIRE WEATHER HAZARDS EXPECTED NEXT COUPLE OF DAYS...BUT COULD SEE 1 TO 3 HOURS OF RELATIVE HUMIDITY VALUES AROUND OR BELOW 35 PERCENT SUNDAY AFTERNOON OVER THE NORTHERN INTERIOR. && .PRELIMINARY POINT TEMPS/POPS... TPA 71 85 70 86 / 5 20 10 0 FMY 69 88 69 89 / 5 20 10 10 GIF 69 89 69 89 / 20 20 10 0 SRQ 70 84 68 84 / 5 20 10 0 BKV 64 87 62 88 / 5 30 10 0 && .TBW WATCHES/WARNINGS/ADVISORIES... FL...NONE. GULF WATERS...NONE. && SHORT TERM/MARINE...PRC LONG TERM/AVIATION/FIRE WX....JLC
Hazardous weather outlook, Apr 21, 4:42 AM EDT, 10 hours 10 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 442 AM EDT FRI APR 21 2006 FLZ039-042-043-048>052-055>057-060>062-065-212000- LEVY-CITRUS-SUMTER-HERNANDO-PASCO-PINELLAS-HILLSBOROUGH-POLK- MANATEE-HARDEE-HIGHLANDS-SARASOTA-DE SOTO-CHARLOTTE-LEE- 442 AM EDT FRI APR 21 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST FLORIDA AND WEST CENTRAL FLORIDA. .DAY ONE...TODAY AND TONIGHT PATCHY DENSE FOG IS POSSIBLE ACROSS PORTIONS OF WEST CENTRAL FLORIDA THIS MORNING. MOTORISTS THIS MORNING SHOULD SLOW DOWN IN FOG...USE LOW BEAM HEADLIGHTS...AND ALLOW EXTRA TRAVEL TIME. THE FOG SHOULD BURN OFF BY MID MORNING. ISOLATED THUNDERSTORMS ARE EXPECTED ACROSS INTERIOR SECTIONS OF WEST CENTRAL FLORIDA THIS AFTERNOON. PEOPLE WITH OUTDOOR ACTIVITIES SHOULD STAY AWARE OF THE SKY...AND MOVE INDOORS IF LIGHTNING IS SEEN OR THUNDER IS HEARD. BEFORE THE ARRIVAL OF THE SEA BREEZE TODAY...LOW RELATIVE HUMIDITY VALUES AND SEA BREEZE THUNDERSTORMS WILL HAVE THE POTENTIAL TO CREATE DANGEROUS FIRE WEATHER CONDITIONS THIS AFTERNOON ACROSS INTERIOR PORTIONS OF WEST CENTRAL FLORIDA. THESE CONDITIONS WILL BE FAVORABLE FOR INCREASED SPREAD OF ANY FIRE THAT MAY START TODAY. RESIDENTS AND VISITORS OF WEST CENTRAL AND SOUTHWEST FLORIDA SHOULD BE EXTRA CAREFUL WITH ANY OUTDOOR OPEN FLAMES OR BARBECUES TODAY. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY NO SIGNIFICANT HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 3:09 PM EDT | Severe Thunderstorm Warning | TBW | Citrus | 51 min |
| Apr 21, 3:16 PM EDT | Severe Thunderstorm Warning | TBW | Hernando | 44 min |
| Apr 21, 3:53 PM EDT | Severe Thunderstorm Warning | TBW | Levy | 37 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2006Every severe thunderstorm warning in 2006
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.