Alert archive / Florida / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 99, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 5, 1997, 2:13 PM EDT for Hernando 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 5, 1997, 2:13 PM EDT (18:13 UTC)
- Expired
- Jul 5, 1997, 2:45 PM EDT
- In force
- 32 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Hernando County, FL
The radar
The Tampa radar (KTBW), 95 km from the middle of the area, began a volume at 18:14 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 5, 2:20 PM EDT | Thunderstorm Wind | Brooksville, FL | Several large trees were downed by thunderstorm winds near U.S. Highway 98 and Olympia 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, 6.2 hours before the alert went out and 95 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
- 1187 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 896 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTBW 051814 RRA SVRTBW FLC053-FLZ505-051845- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 213 PM EDT SAT JUL 5 1997 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 245 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATION(S) IN WEST CENTRAL FLORIDA ...HERNANDO COUNTY AT 210 PM...RADAR DETECTED A SEVERE THUNDERSTORM NEAR SPRING LAKE. THE MOVEMENT WAS TO THE NORTHEAST AT 15 MPH. BY DEFINITION...SEVERE THUNDERSTORMS HAVE WINDS OF 58 MPH OR GREATER AND/OR DIME SIZE HAIL OR LARGER. IF THIS STORM APPROACHES YOU AREA...GO INDOORS AND STAY THERE UNTIL THE STORM PASSES.
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 5, 9:47 AM EDT, 4 hours 26 minutes earlier.
Area forecast discussion, Jul 5, 9:47 AM EDT, 4 hours 26 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY-RUSKIN, FL 945 AM EDT SAT JUL 5 1997 .CURRENTLY...RADAR AND LIGHTNING DETECTION EQUIPMENT SHOW A PRETTY GOOD AREA OF THUNDERSTORMS STRETCHING FROM ABOUT 30 NM OFFSHORE FROM PASCO COUNTY NORTHWARD AND OUT OF THE FA WITH ANOTHER SMALLER AREA OF THUNDERSTORMS IN LEE COUNTY ...WILL BE HANDLED WITH APPROPRIATE STATEMENTS AS SITUATION UNFOLDS. WEAK UPPER LEVEL LOW ACROSS SOUTH FL EMBEDDED IN A PRETTY GOOD PLUME OF MOISTURE EVIDENT...FROM AT LEAST 400 MB AND HIGHER... ON WATER VAPOR IMAGERY THIS MORNING. CURRENT 12 UTC SOUNDING HAS PRECIP WATER OF 1.58 WHICH IS PRETTY CLOSE TO YESTERDAYS VALUE. LIFTED INDEX OF -6 SAME AS YESTERDAY WHICH IS UNSTABLE ...REMEMBERING THAT THE AVERAGE LI FOR JULY IN A LOCAL CLIMATE STUDY DONE HERE IS -4 ANYWAY!...500 MB TEMP OF -7.3 C IS JUST ABOUT EQUAL TO THE CLIMO VALUE OF -7.4. ALL THE ABOVE JUST JUSTIFIES THAT JULY IS A FAIRLY WET MONTH FOR THE WEST COAST OF CENTRAL FLORIDA AND THE FIRST PERIOD OF CURRENT FORECAST HAS THE WX AND TEMPS HANDELED WELL. WEST COAST SEA BREEZE EXPECTED TO MAKE ITS WAY INLAND AGAIN TODAY...THAT ALONG WITH THE ORIENTATION OF THE CURRENT SURFACE PRESSURE GRADIENhT...WILL KEEP WINDS FROM A SOUTHWEST TO WEST DIRECTION OVER THE FA TODAY. REMAINDER OF FORECAST LOOKS GOOD. PELATTI
In the hours before
Special weather statement, Jul 5, 11:10 AM EDT, 3 hours 3 minutes before
FLZ039-042-043-048>052-055>057-060>062-065-504-505-051530- WEST CENTRAL AND SOUTHWEST FLORIDA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL 1110 AM EDT SAT JUL 5 1997 ...SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING FOR NORTHERN PORTIONS OF WEST CENTRAL FLORIDA FROM HILLSBOROUGH AND POLK COUNTIES NORTHWARD... A MOIST AND UNSTABLE AIRMASS...COMBINED WITH AFTERNOON SEA BREEZE ACTIVITY AND A UPPER LEVEL DISTURBANCE MOVING THROUGH NORTHERN PORTIONS OF CENTRAL FLORIDA...WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS ACROSS WEST CENTRAL AND SOUTHWEST FLORIDA THIS AFTERNOON AND EARLY EVENING. SOME STORMS IN THE RISK AREA MAY BECOME SEVERE...MAINLY OVER LEVY AND CITRUS COUNTIES...AND CAN RESULT IN WINDS IN EXCESS OF 58 MPH AND LARGE HAIL. IN ADDITION SLOW MOVING STORMS WILL HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAIN WITH RAINFALL RATES OF UP TO 2 INCHES PER HOUR WHICH MAY CAUSE MINOR FLOODING IN LOW LYING AND POOR DRAINING AREAS. ALL RESIDENTS AND MARINERS IN WEST CENTRAL AND SOUTHWEST FLORIDA PLANNING ANY OUTDOOR ACTIVITY THIS AFTERNOON SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND MOVE TO SAFETY IF THREATENING WEATHER APPROACHES. LISTEN TO NOAA WEATHER RADIO... RADIO...TELEVISION...OR CABLE TELEVISION FOR MORE INFORMATION. PELATTI
Special weather statement, Jul 5, 11:17 AM EDT, 2 hours 56 minutes before
FLZ039-042-043-048>052-055>057-060>062-065-504-505-051530- WEST CENTRAL AND SOUTHWEST FLORIDA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL 1110 AM EDT SAT JUL 5 1997 ...SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING FOR NORTHERN PORTIONS OF WEST CENTRAL FLORIDA FROM HILLSBOROUGH AND POLK COUNTIES NORTHWARD... A MOIST AND UNSTABLE AIRMASS...COMBINED WITH AFTERNOON SEA BREEZE ACTIVITY AND A UPPER LEVEL DISTURBANCE MOVING THROUGH NORTHERN PORTIONS OF CENTRAL FLORIDA...WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS ACROSS WEST CENTRAL AND SOUTHWEST FLORIDA THIS AFTERNOON AND EARLY EVENING. SOME STORMS IN THE RISK AREA MAY BECOME SEVERE...MAINLY OVER LEVY AND CITRUS COUNTIES...AND CAN RESULT IN WINDS IN EXCESS OF 58 MPH AND LARGE HAIL. IN ADDITION SLOW MOVING STORMS WILL HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAIN WITH RAINFALL RATES OF UP TO 2 INCHES PER HOUR WHICH MAY CAUSE MINOR FLOODING IN LOW LYING AND POOR DRAINING AREAS. ALL RESIDENTS AND MARINERS IN WEST CENTRAL AND SOUTHWEST FLORIDA PLANNING ANY OUTDOOR ACTIVITY THIS AFTERNOON SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND MOVE TO SAFETY IF THREATENING WEATHER APPROACHES. LISTEN TO NOAA WEATHER RADIO... RADIO...TELEVISION...OR CABLE TELEVISION FOR MORE INFORMATION. PELATTI
Special weather statement, Jul 5, 11:18 AM EDT, 2 hours 55 minutes before
FLZ039-042-043-048>052-055>057-060>062-065-504-505-051900- WEST CENTRAL AND SOUTHWEST FLORIDA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE TAMPA BAY AREA RUSKIN FL 1110 AM EDT SAT JUL 5 1997 ...SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING FOR NORTHERN PORTIONS OF WEST CENTRAL FLORIDA FROM HILLSBOROUGH AND POLK COUNTIES NORTHWARD... A MOIST AND UNSTABLE AIRMASS...COMBINED WITH AFTERNOON SEA BREEZE ACTIVITY AND A UPPER LEVEL DISTURBANCE MOVING THROUGH NORTHERN PORTIONS OF CENTRAL FLORIDA...WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS ACROSS WEST CENTRAL AND SOUTHWEST FLORIDA THIS AFTERNOON AND EARLY EVENING. SOME STORMS IN THE RISK AREA MAY BECOME SEVERE...MAINLY OVER LEVY AND CITRUS COUNTIES...AND CAN RESULT IN WINDS IN EXCESS OF 58 MPH AND LARGE HAIL. IN ADDITION SLOW MOVING STORMS WILL HAVE THE POTENTIAL TO PRODUCE LOCALLY HEAVY RAIN WITH RAINFALL RATES OF UP TO 2 INCHES PER HOUR WHICH MAY CAUSE MINOR FLOODING IN LOW LYING AND POOR DRAINING AREAS. ALL RESIDENTS AND MARINERS IN WEST CENTRAL AND SOUTHWEST FLORIDA PLANNING ANY OUTDOOR ACTIVITY THIS AFTERNOON SHOULD BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND MOVE TO SAFETY IF THREATENING WEA THER APPROACHES. LISTEN TO NOAA WEATHER RADIO... RADIO...TELEVISION...OR CABLE TELEVISION FOR MORE INFORMATION. PELATTI
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 7:59 AM EDT | Severe Thunderstorm Warning | TBW | Hernando | 46 min |
| Jul 5, 1:43 PM EDT | Severe Thunderstorm Warning | TBW | Hillsborough | 47 min |
| Jul 5, 2:26 PM EDT | Severe Thunderstorm Warning | TBW | Hillsborough | 49 min |
| Jul 5, 6:46 PM EDT | Severe Thunderstorm Warning | TBW | Pinellas | 44 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1997Every severe thunderstorm warning in 1997
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; radar from the NEXRAD Level II archive.