Alert archive / Florida / Flash Flood Warnings in 1998
Flash Flood Warning 9, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this flash flood warning at Sep 20, 1998, 3:54 PM EDT for Hillsborough County, Florida. It was in force for 111 min. 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, 3:54 PM EDT (19:54 UTC)
- Expired
- Sep 20, 1998, 5:45 PM EDT
- In force
- 111 min
- 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 19:54 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, 7.9 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 201956 FFWTBW FLC057-202145- BULLETIN - EAS ACTIVATION REQUESTED FLOOD WARNING NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 354 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 545 PM EDT * AT 352 PM...DOPPLER RADAR INDICATED RADAR INDICATES THAT BETWEEN 4 TO 7 INCHES OF RAIN HAS FALLEN OVER NORTHERN AND NORTHEASTERN HILLSBOROUGH COUNTY BETWEEN 9 AM AND 3 PM. ADDITIONAL MODERATE TO HEAVY RAIN IS REDEVELOPING OVER THE AREA AND SOUTHWARD TO THE RIVERVIEW AND LITHIA AREAS INCLUDING PORTIONS OF THE BRANDON AND MANGO AREAS. PERSONS LIVING IN LOW LYING AREAS AND ALONG STREAMS PARTICULARLY IN NORTHEAST HILLSBOROUGH COUNTY SHOULD TAKE ACTIONS TO SAVE THEIR PROPERTY. * ALTHOUGH MOST OF THE AREA WILL ONLY SEE RAINFALL OF LESS THAN 1/2 INCH...A FEW AREAS COULD SEE UP TO AN ADDITIONAL 2 INCHES THIS AFTERNOON. PERSONS ALONG STREAMS OR FASTER FLOWING RIVERS NEED TO MOVE TO HIGHER GROUND. DO NOT ATTEMPT TO WALK OR DRIVE THROUGH WATER WHICH IS FLOWING.
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, 2:47 PM EDT, 1 hour 7 minutes earlier.
Area forecast discussion, Sep 20, 2:47 PM EDT, 1 hour 7 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA / RUSKIN, FL 247 PM EDT SUN SEP 20 1998 LARGE AREAS OF MODERATE TO HEAVY RAIN CONT TO BE INDICATED BY 88D ACRS PORTIONS OF THE FA EARLY THIS AFTERNOON. ONE AREA HAS PERSISTED OVER POLK AND HILLSBOROUGH COUNTIES WITH ANOTHER ONE OVER SARASOTA... CHARLOTTE AND LEE COUNTIES. RADAR RAINFALL ESTIMATES IN THESE AREAS SINCE EARLY THIS MORNG HAS BEEN ON THE ORDER OF 2 TO 4 INCHES. THESE HVY RAINS HAVE PROMPTED URBAN FLOOD ADVISORIES AND FLOOD WARNINGS FOR HILLSBOROUGH COUNTY. AFTER COORD WITH WSFO MIA HAVE ALREADY UPDATED ZONES TO PUT A LARGE PORTION OF W-CENTRAL FL UNDER A FLOOD WATCH FOR THE REMAINDER OF THIS AFTERNOON AND INTO TONIGHT. LOOKING OVER SATL TRENDS MAY BEGIN TO SEE SOME SUN DVLP NEXT HR OR SO ESPECIALLY ALONG W COASTAL ZONES. THIS SFC HTG IN COMBINATION WITH PWS ABV 2 WILL LIKELY LEAD TO ADDITIONAL RAIN OR TSTM DVLPMT INTO THE EVENING HRS... THUS WOULD SUGGEST AT LEAST A 50% POP FOR MOST ZONES IN THE 5 PM PACKAGE WITH MENTION OF LOCALLY HVY RAINS AS WELL. WELL NO REAL OVERALL SYNOPTIC SCALE CHANGES EXPECTED ACRS THE FA DURING THIS FCST PERIOD. DEEP LYRD MSTR ASSOCIATED WITH REMNANTS OF TRPCL STORM HERMINE NOW OVER NE LA IS PROGD TO CONT MOVG N-NEWD INTO THE TN/MS VALLEY AREAS THRU THE PERIOD. UPR LVL RDG OVER THE ATL IS PROGD TO BUILD W THRU MONDAY WITH SFC RDG AXIS SHIFTING SLIGHTLY N TO THE S-CENTRAL PENINSULA THRU THE PERIOD. THIS WILL RESULT IN A CONTD S TO SWLY DEEP LYRD FLOW ACRS THE FA WHICH WILL KEEP PWS AOA 2. THIS DEEP LYRD MSTR ALONG WITH DAYTIME SFC HTG AND ADEQUATE INSTABILTY WILL CONT TO RESULT IN SCT HEAVY LOCALIZED RAINS AND WDLY SCT TSTMS THRU MONDAY. ATTM I PREFER A BLEND OF THE AVN/NGM POPS AND RECOMMEND AT LEAST LIKELY CATEGORY POPS FOR MONDAY. BEYOND THIS DRIER AIR AND SUBSIDENCE FROM UPR LVL LOW NOW OVER THE SERN BAHAMAS MOVG WWD MAY LWR POPS SOME OVER THE EXTREME SRN PENINSULA MONDAY NIGHT/ TUES...BUT MUCH OF W-CENTRAL FL SHOULD REMAIN MOIST WITH ABV CLIMO POPS CONTG. AS FOR TEMPS BLEND OF FAN/FWC NUMBERS LOOKS GOOD WITH TEMPS IN THE MID TO UPR 80S FROM CONTG N TO S. MCMICHAEL
In the hours before
Special weather statement, Sep 20, 11:28 AM EDT, 4 hours 26 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, 4 hours 26 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, 1:47 PM EDT | Flash Flood Warning | TBW | Hillsborough | 2 hr |
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.