Alert archive / Florida / Flash Flood Warnings in 1998
Flash Flood Warning 8, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this flash flood warning at Sep 20, 1998, 1:47 PM EDT for Hillsborough County, Florida. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 20, 1998, 1:47 PM EDT (17:47 UTC)
- Expired
- Sep 20, 1998, 3:50 PM EDT
- In force
- 2 hr
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Hillsborough County, FL
The radar
The Tampa radar (KTBW), 23 km from the middle of the area, began a volume at 17:49 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.
The nearest sounding before it
Tampa Bay, FL (KTBW), launched 12:00Z, 5.8 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
- 64 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 700 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 69 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 201748 FFWTBW FLC057-201950- BULLETIN - EAS ACTIVATION REQUESTED FLOOD WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 147 PM EDT SUN SEP 20 1998 THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A * FLOOD WARNING FOR... HILLSBOROUGH COUNTY IN WEST CENTRAL FLORIDA * UNTIL 350 PM EDT * AT 143 PM...DOPPLER RADAR INDICATED HEAVY RAIN HAS FALLEN OVER NORTHERN HILLSBOROUGH COUNTY THIS MORNING AND EARLY THIS AFTERNOON. RAIN CONTINUES TO FALL FROM MANGO TO PLANT CITY TO NEAR THE TAMPA PALMS AND LUTZ AREA. ANOTHER 1 TO 2 INCHES OF RAIN ARE POSSIBLE IN NORTHERN AND NORTHEASTERN HILLSBOROUGH COUNTY OVER THE NEXT HOUR. MOST FLOODING DEATHS OCCUR IN AUTOMOBILES. NEVER ATTEMPT TO DRIVE THROUGH WATER WHICH COVERS THE ROADS. PERSONS LIVING IN FLOOD PRONE AREAS NEED TO TAKE ACTION TO PROTECT PROPERTY AND MOVE TO HIGHER GROUND. STAY AWAY FROM STORM DRAINS AND DRAINAGE DITCHES.
What forecasters said that day
The local office's own words before this flash flood 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 flash flood warning went out at Sep 20, 9:51 AM EDT, 3 hours 56 minutes earlier.
Area forecast discussion, Sep 20, 9:51 AM EDT, 3 hours 56 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA / RUSKIN, FL 951 AM EDT SUN SEP 20 1998 AREA OF MOSTLY LIGHT RAIN WITH EMBEDDED HEAVIER SHOWERS STILL COVERING A GOOD PORTION OF THE FA EARLY THIS MORNG VIA 88D RETURNS. ATTM THE HEAVIEST PRECIP IS JUST OFFSHR SARASOTA COUNTY ASSOCIATED WITH SOME DVLPG TSTMS. WITH MORNG RAOBS INDICATING DEEP LYRD TRPCL MSTR AND ADEQUATE INSTABILITY ACRS THE FA WITH PWS AOA 2 AND LIS IN THE -2 TO -4 RANGE FA WILL CONT TO SEE PERIODS OF HEAVY RAINFALL AND ISOLD TSTM TODAY. IN ADDDITON...NEW AREAS OF CONVECTION NOTED ON SATL LOOP DVLPG OVER THE ADJACENT GLF WATERS. WITH DEEP SWLY FLOW ACRS THE REGION INDICATED BY VADS AND RAOBS...THIS CONVECTION WILL LIKELY MOVE TOWARD THE W- CNTRL FL COAST LATER THIS MORNG INTO THE PM HOURS WITH ADDITIONAL HEAVY RAINFALL AMOUNTS. WITH FA ALREADY QUITE SATURATED FROM HEAVY RAINFALL AMOUNTS THE LAST FEW DAYS WILL HAVE TO CONT TO MONITOR 88D AND SATL TRENDS REMAINDER OF THIS MORNG TO SEE IF A FLOOD WATCH MAY BE NEEDED FOR PORTIONS OF MY FA LATER TODAY. ATTM ONLY CHANGE TO PREVIOUS PACKAGE WILL BE TO TWEEK MAX TEMPS DOWN SOME TO ACCOUNT FOR THE CONSIDERABLE CLOUD COVER AND ONGOING AND EXPECTED PRECIP. MCMICHAEL
In the hours before
Special weather statement, Sep 20, 11:28 AM EDT, 2 hours 19 minutes before
FLZ039-042-043-048>052-055>057-060>062-065-202330- WEST CENTRAL AND SOUTHWEST FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 1128 AM EDT SUN SEP 20 1998 ...SHOWERS AND ISOLATED THUNDERSTORMS EXPECTED THIS AFTERNOON SOME WITH LOCALLY HEAVY RAINFALL... ...FLOOD WARNINGS IN EFFECT ON THE ALAFIA...MANATEE...LITTLE MANATEE AND MYAKKA RIVERS... PERIODS OF RAIN AND ISOLATED HEAVIER THUNDERSTORMS ARE EXPECTED OVER WEST CENTRAL AND SOUTHWEST FLORIDA THIS AFTERNOON WITHIN A WARM AND HUMID AIRMASS WHICH COVERS THE STATE. SOUTH TO SOUTHWEST WINDS WILL CONTINUE TO PUMP ABUNDANT TROPICAL MOISTURE NORTHWARD FROM THE CARIBBEAN THROUGH TONIGHT WHICH WILL CONTINUE TO PROVIDE FUEL FOR WIDESPREAD AND LOCALLY HEAVY PRECIPITATION. ALTHOUGH RAINFALL AMOUNTS IN MANY AREAS WILL BE UNDER AN INCH...SOME HEAVIER AMOUNTS OF TWO TO THREE INCHES ARE POSSIBLE. THESE LOCALIZED HEAVY RAINS WILL CAUSE THE PONDING OF WATER ON ROADWAYS AND THE TEMPORARY FLOODING OF LOW LYING OR POOR DRAINAGE AREAS. SEVERAL AREAS HAVE ALREADY RECEIVED FROM THREE TO SIX INCHES OF RAIN SINCE LAST WEDNESDAY...MOST NOTABLY FROM SARASOTA THROUGH LAKELAND AND WINTERHAVEN...AND ALSO IN THE BROOKSVILLE AND SOUTH FORT MYERS AREAS. THESE AREAS WILL BE PARTICULARLY VULNERABLE TO ADDITIONAL HEAVY RAINFALL AMOUNTS THIS AFTERNOON. IF YOU LIVE IN FLOOD PRONE AREAS OR ALONG RIVERS OR FASTER FLOWING STREAMS...REMAIN ALERT TO ANY RAPID RISES IN WATER LEVELS AND BE READY TO MOVE TO HIGHER GROUND IF FLOODING IS OBSERVED. IN ADDITION TO THE HEAVY RAINS ISOLATED THUNDERSTORMS WILL ALSO POSE A THREAT FOR LIGHTNING AND BRIEF GUSTY WINDS TO 30 MPH. AT THE FIRST SIGN OF A THUNDERSTORM MOVE INDOORS IMMEDIATELY. MCMICHAEL
Special weather statement, Sep 20, 11:28 AM EDT, 2 hours 19 minutes before
FLZ039-042-043-048>052-055>057-060>062-065-202330- WEST CENTRAL AND SOUTHWEST FLORIDA HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 1128 AM EDT SUN SEP 20 1998 ...SHOWERS AND ISOLATED THUNDERSTORMS EXPECTED THIS AFTERNOON SOME WITH LOCALLY HEAVY RAINFALL... ...FLOOD WARNINGS IN EFFECT ON THE ALAFIA...MANATEE...LITTLE MANATEE AND MYAKKA RIVERS... PERIODS OF RAIN AND ISOLATED HEAVIER THUNDERSTORMS ARE EXPECTED OVER WEST CENTRAL AND SOUTHWEST FLORIDA THIS AFTERNOON WITHIN A WARM AND HUMID AIRMASS WHICH COVERS THE STATE. SOUTH TO SOUTHWEST WINDS WILL CONTINUE TO PUMP ABUNDANT TROPICAL MOISTURE NORTHWARD FROM THE CARIBBEAN THROUGH TONIGHT WHICH WILL CONTINUE TO PROVIDE FUEL FOR WIDESPREAD AND LOCALLY HEAVY PRECIPITATION. ALTHOUGH RAINFALL AMOUNTS IN MANY AREAS WILL BE UNDER AN INCH...SOME HEAVIER AMOUNTS OF TWO TO THREE INCHES ARE POSSIBLE. THESE LOCALIZED HEAVY RAINS WILL CAUSE THE PONDING OF WATER ON ROADWAYS AND THE TEMPORARY FLOODING OF LOW LYING OR POOR DRAINAGE AREAS. SEVERAL AREAS HAVE ALREADY RECEIVED FROM THREE TO SIX INCHES OF RAIN SINCE LAST WEDNESDAY...MOST NOTABLY FROM SARASOTA THROUGH LAKELAND AND WINTERHAVEN...AND ALSO IN THE BROOKSVILLE AND SOUTH FORT MYERS AREAS. THESE AREAS WILL BE PARTICULARLY VULNERABLE TO ADDITIONAL HEAVY RAINFALL AMOUNTS THIS AFTERNOON. IF YOU LIVE IN FLOOD PRONE AREAS OR ALONG RIVERS OR FASTER FLOWING STREAMS...REMAIN ALERT TO ANY RAPID RISES IN WATER LEVELS AND BE READY TO MOVE TO HIGHER GROUND IF FLOODING IS OBSERVED. IN ADDITION TO THE HEAVY RAINS ISOLATED THUNDERSTORMS WILL ALSO POSE A THREAT FOR LIGHTNING AND BRIEF GUSTY WINDS TO 30 MPH. AT THE FIRST SIGN OF A THUNDERSTORM MOVE INDOORS IMMEDIATELY. MCMICHAEL
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 3:54 PM EDT | Flash Flood Warning | TBW | Hillsborough | 111 min |
Nearby
Flash Flood Warnings in Florida, 1998Every flash flood warning in 1998
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.