Alert archive / Florida / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 21, NWS Jacksonville, FL

May 20, 1986Baker County, Clay County, Duval County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 20, 1986, 1:25 PM EDT for Baker County, Clay County, Duval County, Florida. It was in force for 65 min. 5 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
May 20, 1986, 1:25 PM EDT (17:25 UTC)
Expired
May 20, 1986, 2:30 PM EDT
In force
65 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

Counties Baker County, FL, Clay County, FL, Duval County, FL

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
May 20, 1:30 PM EDTHail 1.75Baker, FL
May 20, 1:30 PM EDTHail 1Duval, FL
May 20, 1:30 PM EDTHail 1.5Clay, FL
May 20, 1:45 PM EDTThunderstorm Wind 65Duval, FL
May 20, 2:15 PM EDTThunderstorm Wind 0Baker, FL

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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 5.4 hours before the alert went out and 239 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, Cape Canaveral, FL at 12:00Z on 1986-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 453 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, Cape Canaveral, FL at 12:00Z on 1986-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.193958Sfc1 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
453 J/kg
Mixed-layer CIN
-98 J/kg
Mixed-layer LCL
1030 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
101 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.5

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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 2:45 PM EDTSevere Thunderstorm WarningJAXSaint Johns60 min

Nearby

Severe Thunderstorm Warnings in Florida, 1986Every severe thunderstorm warning in 1986

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.