Alert archive / Florida / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 152, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 9, 1999, 1:37 PM EDT for Pinellas County, Florida. It was in force for 33 min. 2 reports 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, 1:37 PM EDT (17:37 UTC)
- Expired
- Jul 9, 1999, 2:10 PM EDT
- In force
- 33 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Pinellas County, FL
The radar
The Tampa radar (KTBW), 40 km from the middle of the area, began a volume at 17:39 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, 2:00 PM EDT | Thunderstorm Wind | Oldsmar, FL | Thunderstorm winds downed two large trees and several large branches along Quail Hollow Drive and Turtle Brook near the Countryside Country Club north of State Road 580 and west of County Road 611. |
| Jul 9, 2:10 PM EDT | Hail 0.88 | St Petersburg, FL | Nickel sized hail was reported near the Howard Franklin Bridge (Interstate I-275) in Pinellas County by WTSP-TV of St Petersburg. |
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, 5.6 hours before the alert went out and 40 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, 10:15 AM EDT, 3 hours 22 minutes earlier.
Area forecast discussion, Jul 9, 10:15 AM EDT, 3 hours 22 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY-RUSKIN, FL 1015 AM EDT FRI JUL 9 1999 FEW TSRA FIRING OFF THE LAND BREEZE ABOUT 20NM OFFSHORE THIS MORNING WHILE MUCH BIGGER COMPLEX FROM UPPER LOW ABOUT 100NM OFFSHORE AND QUICKLY EXPANDING NORTH. H70 FLOW IS AROUND 10 TO 15 KTS WITH DIRECTIONS FROM THE SE IN THE SOUTH...S ACROSS CENTRAL SECTIONS AND MORE SW IN NORTHERN AREAS AS IT ROTATES AROUND A HIGH IN THE BAHAMAS. THINK PERHAPS LEVY IS A BIT UNDERDONE IN POPS THIS AFTERNOON SINCE GULF MOISTURE IS QUICKLY ADVANCING AND WILL UPDATE ALL ZONES TO ADJUST AND CLEAN UP WORDING. MARINE...GULF COMPLEX COULD STIR UP LOCAL COASTAL FORECAST BY THE AFTERNOON HOURS AS 003 OBS INDICATE A SE WIND 18KT AND 4FT SEAS. SUGGEST TWEAKING UP WIND AND SEAS A CAT. 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, 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, 2:31 PM EDT | Severe Thunderstorm Warning | TBW | Hillsborough | 44 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.