Alert archive / Florida / Tornado Warnings in 2001

Tornado Warning 13, NWS Jacksonville, FL

March 29, 2001Nassau County, Florida

NWS Jacksonville, FL issued this tornado warning at Mar 29, 2001, 11:13 AM EST for Nassau County, Florida. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Mar 29, 2001, 11:13 AM EST (16:13 UTC)
Expired: Mar 29, 2001, 12:00 PM EST
In force: 47 min
Issued by: NWS Jacksonville, FL
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 18 km from the middle of the area, began a volume at 16:16 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 29, 9:15 AM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 4.2 hours before the alert went out and 16 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: 267 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 717 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 105 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS52 KJAX 291613
TORJAX
FLC089-291700-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
1113 AM EST THU MAR 29 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* TORNADO WARNING FOR...
  NASSAU COUNTY IN NORTHEAST FLORIDA
  THIS INCLUDES...CALLAHAN...HILLIARD...

* UNTIL NOON EST

* AT 1111 AM EST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO 2 MILES NORTHWEST OF CALLAHAN...MOVING NORTHEAST
  AT 45 MPH.

* SOME LOCATIONS NEAR THE PATH OF THE STORM THROUGH NOON EST...
  CALLAHAN...
  HILLIARD...

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 PM EST
THURSDAY AFTERNOON FOR NORTHEASTERN FLORIDA.

LAT...LON 3074 8202 3047 8190 3057 8171 3057 8151
          3068 8151

$$

LETRO

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 29, 9:30 AM EST	Severe Thunderstorm Warning	JAX	Gilchrist	45 min
Mar 29, 9:51 AM EST	Severe Thunderstorm Warning	JAX	Baker, Bradford, Columbia, Union	54 min
Mar 29, 9:51 AM EST	Severe Thunderstorm Warning	JAX	Alachua, Marion	54 min
Mar 29, 10:27 AM EST	Severe Thunderstorm Warning	JAX	Clay, Marion, Putnam	63 min
Mar 29, 10:41 AM EST	Severe Thunderstorm Warning	JAX	Duval, Nassau	79 min
Mar 29, 10:44 AM EST	Tornado Warning	JAX	Clay, Putnam	46 min
Mar 29, 10:53 AM EST	Tornado Warning	JAX	Duval	37 min
Mar 29, 11:00 AM EST	Severe Thunderstorm Warning	JAX	Flagler, Saint Johns	45 min
Mar 29, 11:08 AM EST	Tornado Warning	JAX	Saint Johns	52 min
Mar 29, 11:27 AM EST	Tornado Warning	JAX	Duval	33 min

Nearby

Tornado Warnings in Florida, 2001 Every tornado warning in 2001 Tornadoes in 2001

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.