Alert archive / Florida / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 26, NWS Tampa Bay, FL

July 17, 2002Levy County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Jul 17, 2002, 10:36 PM EDT for Levy County, Florida. It was in force for 9 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
Jul 17, 2002, 10:36 PM EDT (02:36 UTC)
Expired
Jul 17, 2002, 10:45 PM EDT
In force
9 min
Issued by
NWS Tampa Bay, FL
Area
Whole counties

County Levy County, FL

The radar

The Jacksonville radar (KJAX), 170 km from the middle of the area, began a volume at 02:37 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 2.6 hours before the alert went out and 171 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.

Skew-T log-pSkew-T log-p diagram, Jacksonville, FL at 00:00Z on 2002-07-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2307 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 00:00Z on 2002-07-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2307 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
1355 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

214 
WUUS52 KTBW 180236
SVRTBW
FLC075-180245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
1037 PM EDT WED JUL 17 2002

THE NATIONAL WEATHER SERVICE IN RUSKIN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN LEVY COUNTY IN FLORIDA.

* UNTIL 1045 PM EDT.

* AT 1037 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM WITH DAMAGING WINDS...OVER CEDAR KEY...MOVING
  WEST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT...
  CEDAR KEY.

WIND GUSTS TO 60 MPH WILL CAUSE SOME STRUCTURAL DAMAGE...MAINLY TO
TREES AND POWER LINES. POORLY ANCHORED ROOFS...MOBILE HOMES...AND
SHEDS ARE ALSO AT RISK.

REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY
OR YOUR COUNTY EMERGENCY MANAGEMENT. THEY WILL RELAY YOUR REPORT TO
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN RUSKIN.

$$

LAT...LON 2914 8291 2927 8294 2921 8309 2907 8302

88

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 17, 8:55 PM EDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jul 17, 8:55 PM EDT, 1 hour 41 minutes before
WEST CENTRAL AND SOUTHWEST FLORIDA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAMPA BAY AREA - RUSKIN FL
855 PM EDT WED JUL 17 2002

CURRENTLY...LINE OF STRONG CONVECTION MARCHING ACROSS THE NATURE
COAST...WITH OTHER POP-UP STORMS ALONG OLD BOUNDARIES MOVING THROUGH
POLK AND HIGHLANDS AND INTO CHARLOTTE AND LEE CO.  ALL ACTIVITY IS
MOVING SW AT 15 TO 20 MPH.  OUTSIDE OF PCPN...TEMPS STILL RATHER
HOT FOR THIS TIME OF NIGHT (90) BUT DWPTS DID DROP A BIT AS DRIER
AIR FILTERED DOWN IN WELL MIXED ATMOSPHERE.  KTBW SOUNDING SHOWED
NNW FLOW NEAR SFC AND NNE FLOW ABOVE 850 MB...BUT WAS RELATIVELY
DRY.

DISC...WILL CONTINUE MONITORING NATURE COAST LINE FOR POSSIBLE
WARNINGS FOR THE NEXT HOUR OR SO...ESP AS IT APPROACHES THE MARINE
WATERS.  OTHERWISE...WILL UPDATE ZONES BY 945 AND USE CURR PCPN
TRENDS.  LOOKS LIKE MOST PCPN WILL BE IN THE GULF BEFORE MIDNIGHT...
BUT SHOULD REMAIN ACTIVE INTO THE EARLY MORNING HOURS AS IT SLIDES
INTO THE E CENTRAL GULF.

AS FOR HEAT ADZY...SEE NO REASON TO DEVIATE FROM GOING FCST AS MIN
TEMPS WILL HOVER AT OR ABOVE 80 IN URBAN/COASTAL AREAS (WITH HEAT
INDICES BETWEEN 85 AND 90 AS DWPTS RECOVER).  A STORM WITH HEAVY
RAIN WOULD TEMPORARILY PROVIDE RELIEF...BUT CURR RADAR TRENDS
SUGGESTING ONLY THE SW CORNER WILL EXPERIENCE THIS.  WILL UPDATE NPW
WITH THE ZFP ISSUANCE.

MARINE:  EXPECT SCT-LCL NUMEROUS TSTMS WELL INTO THE NIGHT AS
ACTIVITY MARCHES ON...SO WILL HAVE NO TIMING AS CURRENTLY FCST.
WINDS LIGHT/GENERALLY WNW OUTSIDE OF CONVECTION OVERNIGHT.

.TBW...HEAT ADVISORY FOR HILLSBOROUGH...PINELLAS...MANATEE...
       SARASOTA...CHARLOTTE...LEE.

88/GOLDSMITH

The office that day

Everything else NWS Tampa Bay, FL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 10:32 PM EDTSpecial Marine WarningTBW58 min

Nearby

Severe Thunderstorm Warnings in Florida, 2002Every severe thunderstorm warning in 2002

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.