Alert archive / Florida / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 144, NWS Tampa Bay, FL
NWS Tampa Bay, FL issued this severe thunderstorm warning at Sep 4, 2001, 6:37 PM EDT for Polk County, Florida. It was in force for 38 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
- Sep 4, 2001, 6:37 PM EDT (22:37 UTC)
- Expired
- Sep 4, 2001, 7:15 PM EDT
- In force
- 38 min
- Issued by
- NWS Tampa Bay, FL
- Area
- Whole counties
County Polk County, FL
The radar
The Tampa radar (KTBW), 74 km from the middle of the area, began a volume at 22:37 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 |
|---|---|---|---|
| Sep 4, 6:45 PM EDT | Thunderstorm Wind | Davenport, FL | The Davenport fire department reported that several large three to six foot long branches were downed between Davenport and Loughman along U.S. Highway 92 in extreme northeast Polk county. |
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
Cape Canaveral, FL (KXMR), launched 12:00Z, 10.6 hours before the alert went out and 131 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
- 2418 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 681 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -4 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 Sep 4, 1:30 PM EDT, 5 hours 7 minutes earlier.
Area forecast discussion, Sep 4, 1:30 PM EDT, 5 hours 7 minutes before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL 130 PM EDT TUE SEP 4 2001 CURRENTLY...SCT SHOWERS AND TSTMS FIRING AS EXPECTED ALONG THE WEST COAST SEA BREEZE. TSTMS AROUND THE TAMPA BAY AREA MUCH EARLIER THAN YESTERDAY. VISIBLE SAT LOOP SHOWING S-N ALLIGNED CLOUD STREETS... WHICH CLEARLY INDICATES A SOUTHERLY STEERING FLOW. A SLIGHT ANTICYCLONIC CURVATURE IN THE CLOUD STREETS OVER THE CENT FA UNDER THE SFC RIDGE AXIS. --FCST DISC-- MODELS VERY SIMILAR WITH SHOWING LITTLE TO NO CHANGE IN LARGE SCALE PATTERN THROUGH 60 HRS. UPPER SHEAR AXIS AND WEAK SFC TROF WILL REMAIN WELL NORTH OF THE AREA OVER S GA...WHILE IL-DEFINED SFC RIDGE AXIS SITS GENERALLY OVER THE N 1/2 OF THE FA. WEAK SSE SYNOPTIC LOW LEVEL FLOW WILL PERSIST...WITH AFTN WEST COAST SEA BREEZES. WITH WEAK SOUTHERLY STEERING FLOW...EXPECT STORMS TO FIRST FORM ALONG THE SEA BREEZE...AND THEN FORM ALONG CONFLUENT BOUNDARIES WELL INLAND. BY LATER IN THE AFTN/EVENING...THE WEST COAST SEA BREEZE AND OUTFLOW BOUNDARIES WILL INTERACT...ESPECIALLY FROM ABT SRQ N...WHERE WEST COAST SEA BREEZE EXPECTED TO PUSH FARTHER INLAND. NEAR CLIMO 40-50% POPS SEEM APPROPRIATE FOR NOW...SAME AS CURRENT FCST. --EXTENDED-- NEW AVN AND OLD MRF INDICATE ESE FLOW TO PERSIST THROUGH EARLY NEXT WEEK. LITTLE/NO CHANGE EXPECTED TO CURRENT EXTENDED. WILL ALSO NEED TO KEEP A CLOSE EYE ON FUTURE TRACK OF ERIN. --MARINE-- RELATIVELY LIGHT WINDS WITH NO HIGHLIGHTS TO CONTINUE THROUGH THE PERIOD. NO SIGNIFICANT CHGS EXPECTED. PRELIM S: TPA 077/090 076/090 3545 FMY 075/091 075/091 4555= .TBW...NONE. MORALES
Nearby
Severe Thunderstorm Warnings in Florida, 2001Every severe thunderstorm warning in 2001
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.