Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 268, NWS Jacksonville, FL

August 20, 2000Alachua County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 20, 2000, 3:45 PM EDT for Alachua County, Florida. It was in force for 45 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: Aug 20, 2000, 3:45 PM EDT (19:45 UTC)
Expired: Aug 20, 2000, 4:30 PM EDT
In force: 45 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Alachua County, FL

What was reported inside it

Time	Report	Where	Remark
Aug 20, 4:05 PM EDT	Thunderstorm Wind	Gainesville, FL	Large trees and power lines were blown down.

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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.8 hours before the alert went out and 204 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2114 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 5.8

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.

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 Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 3:00 PM EDT, 45 minutes earlier.

Area forecast discussion, Aug 20, 3:00 PM EDT, 45 minutes before

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In the hours before

Special weather statement, Aug 20, 12:30 PM EDT, 3 hours 15 minutes before

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    <section class="card" role="status" aria-live="polite">
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 8:26 PM EDT	Severe Thunderstorm Warning	JAX	Putnam	49 min
Aug 19, 8:10 PM EDT	Severe Thunderstorm Warning	JAX	Charlton	65 min
Aug 19, 9:13 PM EDT	Severe Thunderstorm Warning	JAX	Clinch	47 min

Nearby

Severe Thunderstorm Warnings in Florida, 2000 Every severe thunderstorm warning in 2000

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.