Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 155, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 9, 1999, 2:31 PM EDT for Hillsborough County, Florida. It was in force for 44 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 9, 1999, 2:31 PM EDT (18:31 UTC)
- Expired
- Jul 9, 1999, 3:15 PM EDT
- In force
- 44 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 18:34 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 9, 3:05 PM EDT | Thunderstorm Wind 57 | Riverview, FL | A 60 to 65 mph thunderstorm wind gust was reported in Riverview by an off-duty NWS meteorologist. The thunderstorm winds downed several large tree branches which damaged a lanai in the McMullen Loop area of Riverview. |
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, 6.5 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
- 725 J/kg
- Mixed-layer CIN
- -79 J/kg
- Mixed-layer LCL
- 1121 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 9, 2:15 PM EDT, 16 minutes earlier.
Area forecast discussion, Jul 9, 2:15 PM EDT, 16 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY-RUSKIN, FL 215 PM EDT FRI JUL 9 1999 SEVERE WEATHER ON THE INCREASE WITH AN IMPRESSIVE WATERSPOUT IN CLEARWATER HARBOR AROUND 100 PM AND EXPLOSIVE THUNDERSTORM DEVELOPMENT CONTINUING. COMPLEX IN THE GULF HAS PRODUCED AN OUTFLOW WHICH HAS MADE A DEFINITE TURN TO THE EAST/NORTHEAST. TSRA FROM THE OUTFLOW WILL MAKE LAND IN ABOUT 10 MINUTES AND WILL INTERACT WITH WCSB. HAVENT HAD MUCH TIME TO LOOK AT MODELS BUT FROM WHAT I DID SEE INDICATES SOME DRYING/SUBSIDENCE OVER SOUTHERN HALF OF CWA ON SAT WITH CONSIDERABLE MOISTURE REMAINING IN THE NORTH. THINK FMY AREA WILL BE HOT WITH LIMITED PRECIP ON SAT WHILE NORTHERN AREAS WILL HAVE ENHANCED AFTERNOON PRECIP ALONG THE SEABREEZE. SUN LOOKS TO BE SIMILIAR...ALTHOUGH INLAND AREAS SHOULD BE FAVORED AS SOUTHWEST WINDS PICK UP. MARINE...NUMEROUS TSRA AND GUSTY WINDS WILL CHURN UP SEAS THROUGH TONIGHT...WITH SLOWLY SUBSIDING CONDITIONS ON SAT. EXPECT 10 TO 15KT WITH GUSTS TO 30 AND 4 TO 5 FT SEAS TONIGHT. SUN LOOKS TO BE FAIRLY LIGHT AND QUIET. FMY 76/94/77/94 1212 TPA 76/91/76/92 3323 67/GARRARD
The office that day
Everything else NWS Tampa Bay, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 12:55 PM EDT | Tornado Warning | TBW | Pinellas | 35 min |
| Jul 9, 1:37 PM EDT | Severe Thunderstorm Warning | TBW | Pinellas | 33 min |
| Jul 9, 2:11 PM EDT | Severe Thunderstorm Warning | TBW | Pinellas | 34 min |
| Jul 9, 2:16 PM EDT | Severe Thunderstorm Warning | TBW | Manatee | 49 min |
| Jul 9, 2:32 PM EDT | Tornado Warning | TBW | Manatee | 28 min |
| Jul 9, 3:07 PM EDT | Severe Thunderstorm Warning | TBW | Hillsborough | 48 min |
| Jul 9, 3:11 PM EDT | Tornado Warning | TBW | Manatee | 34 min |
Nearby
Severe Thunderstorm Warnings in Florida, 1999Every severe thunderstorm warning in 1999
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.