Alert archive / Florida / Tornado Warnings in 1991

Tornado Warning 4, NWS Jacksonville, FL

April 23, 1991Putnam County, Saint Johns County, Florida

NWS Jacksonville, FL issued this tornado warning at Apr 23, 1991, 11:07 AM EDT for Putnam County, Saint Johns County, Florida. It was in force for 68 min. 2 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
Apr 23, 1991, 11:07 AM EDT (15:07 UTC)
Expired
Apr 23, 1991, 12:15 PM EDT
In force
68 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

Counties Putnam County, FL, Saint Johns County, FL

What was reported inside it

TimeReportWhereRemark
Apr 23, 11:10 AM EDTTornado F0St. Johns, FL
Apr 23, 11:28 AM EDTThunderstorm Wind 0Putnam, 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

Jacksonville, FL (KAYS), launched 12:00Z, 3.1 hours before the alert went out and 83 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 12:00Z on 1991-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 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 12:00Z on 1991-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 22 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
3 J/kg
Mixed-layer CIN
-339 J/kg
Mixed-layer LCL
712 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
22 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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
Apr 23, 7:10 AM EDTSevere Thunderstorm WarningJAXAtkinson, Ware2 hr
Apr 23, 7:47 AM EDTSevere Thunderstorm WarningJAXAlachua, Columbia, Union58 min
Apr 23, 7:47 AM EDTSevere Thunderstorm WarningJAXBradford58 min
Apr 23, 8:00 AM EDTSevere Thunderstorm WarningJAXClay, Saint Johns60 min
Apr 23, 9:02 AM EDTSevere Thunderstorm WarningJAXPutnam58 min
Apr 23, 9:17 AM EDTSevere Thunderstorm WarningJAXColumbia58 min
Apr 23, 9:30 AM EDTSevere Thunderstorm WarningJAXSaint Johns60 min
Apr 23, 10:09 AM EDTSevere Thunderstorm WarningJAXAlachua, Bradford, Clay, Putnam66 min
Apr 23, 11:02 AM EDTSevere Thunderstorm WarningJAXSaint Johns58 min

Nearby

Tornado Warnings in Florida, 1991Every tornado warning in 1991Tornadoes in 1991

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.