Alert archive / Florida / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 63, NWS Jacksonville, FL

May 14, 2000Clay County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at May 14, 2000, 5:27 PM EDT for Clay County, Florida. It was in force for 48 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: May 14, 2000, 5:27 PM EDT (21:27 UTC)
Expired: May 14, 2000, 6:15 PM EDT
In force: 48 min
Issued by: NWS Jacksonville, FL
Area: Whole counties

County Clay County, FL

The radar

The Jacksonville radar (KJAX), 58 km from the middle of the area, began a volume at 21:28 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.

What was reported inside it

Time	Report	Where	Remark
May 14, 5:35 PM EDT	Hail 1.25	Middleburg, FL
May 14, 6:15 PM EDT	Hail 1.75	Orange Park, 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 9.5 hours before the alert went out and 59 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: 1223 J/kg
Mixed-layer CIN: -66 J/kg
Mixed-layer LCL: 905 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 May 14, 1:55 PM EDT, 3 hours 32 minutes earlier.

Area forecast discussion, May 14, 1:55 PM EDT, 3 hours 32 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE JACKSONVILLE FL
155 PM EDT SUN MAY 14 2000

ANALYSIS OF SATELLITE PIX AND SURFACE OBS INDICATES A BROAD...WEAK
FRONTAL ZONE OVER THE CWA WITH A GOOD AREA OF CU DEVELOPING ACROSS
THE ENTIRE AREA... EXCEPT THE NORTHWESTERN PORTION.

EXPECT LITTLE MOVEMENT IN FRONTAL ZONE... THEREFORE AS THE HIGH
BUILDS TO OUR NORTH... IT MAY STRENGTHEN THE COASTAL LOW LEVEL NE
FLOW AND THE POTENTIAL FOR SURFACE LOW DEVELOPMENT OVER OUR ATLANTIC
COASTAL WATERS LATE TONIGHT AND MONDAY.

PRELIM

AMG 62/84/58/86 0000
SSI 68/77/64/78 3200
JAX 68/83/62/86 3200
GNV 65/83/61/86 2000 22

.JAX...
.GA...NONE
.FL...NONE

JOHNSON

The office that day

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

Issued	Product	Office	Counties	Lasted
May 14, 4:20 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Gilchrist	40 min
May 14, 4:47 PM EDT	Severe Thunderstorm Warning	JAX	Clay	43 min
May 14, 4:59 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	46 min
May 14, 5:23 PM EDT	Severe Thunderstorm Warning	JAX	Saint Johns	47 min
May 14, 5:45 PM EDT	Severe Thunderstorm Warning	JAX	Bradford, Clay	30 min
May 14, 5:58 PM EDT	Severe Thunderstorm Warning	JAX	Putnam, Saint Johns	47 min
May 14, 6:10 PM EDT	Severe Thunderstorm Warning	JAX	Clay	50 min
May 14, 7:14 PM EDT	Severe Thunderstorm Warning	JAX	Flagler	61 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; radar from the NEXRAD Level II archive.