Alert archive / Florida / Severe Thunderstorm Watches in 1998

Severe Thunderstorm Watch 72

February 28, 199818 counties in Florida

The Storm Prediction Center issued this severe thunderstorm watch at Feb 28, 1998, 11:00 AM EST for 18 counties in Florida. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Feb 28, 1998, 11:00 AM EST (16:00 UTC)
Expired
Feb 28, 1998, 5:00 PM EST
In force
6 hr
Issued by
the Storm Prediction Center

Counties Brevard County, FL, Charlotte County, FL, DeSoto County, FL, Hardee County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Manatee County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL, Volusia County, FL

The radar

The Tampa radar (KTBW), 50 km from the middle of the area, began a volume at 15:55 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.

Warnings issued inside it

6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Feb 28, 11:45 AM ESTSevere Thunderstorm WarningTBWPolk65 min
Feb 28, 12:10 PM ESTSevere Thunderstorm WarningTBWHillsborough, Manatee65 min
Feb 28, 12:17 PM ESTSevere Thunderstorm WarningMLBOsceola48 min
Feb 28, 12:22 PM ESTSevere Thunderstorm WarningMLBOrange63 min
Feb 28, 1:27 PM ESTSevere Thunderstorm WarningMLBBrevard48 min
Feb 28, 2:07 PM ESTSevere Thunderstorm WarningMLBIndian River48 min

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 4.0 hours before the alert went out and 50 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, Tampa Bay, FL at 12:00Z on 1998-02-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1297 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, Tampa Bay, FL at 12:00Z on 1998-02-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 194 square meters per square second.19395878Sfc1 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
1297 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
722 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
194 m²/s²
0-3 km storm-relative helicity
188 m²/s²
Significant tornado parameter
1.5
Supercell composite
10.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

Nearby

Severe Thunderstorm Watches in Florida, 1998Every severe thunderstorm watch 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.