Alert archive / Florida / Tornado Warnings in 2001

Tornado Warning 9, NWS Jacksonville, FL

March 15, 2001Nassau County, Florida

NWS Jacksonville, FL issued this tornado warning at Mar 15, 2001, 5:25 PM EST for Nassau County, Florida. It was in force for 50 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 15, 2001, 5:25 PM EST (22:25 UTC)
Expired: Mar 15, 2001, 6:15 PM EST
In force: 50 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), 17 km from the middle of the area, began a volume at 22:27 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 15, 1:00 PM EST	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 10.4 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: 477 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 570 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 362 m²/s²
0-3 km storm-relative helicity: 419 m²/s²
Significant tornado parameter: 1.3
Supercell composite: 7.6

Open this sounding in Storm Lab

The text

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

000 
WFUS52 KJAX 152226
TORJAX
FLC089-152315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
525 PM EST THU MAR 15 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 615 PM EST

* AT 522 PM EST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO 5 MILES NORTHEAST OF CALLAHAN...MOVING NORTHEAST
  AT 15 MPH.

* SOME LOCATIONS NEAR THE PATH OF THE STORM THROUGH 615 PM EST...
  EVERGREEN... YULEE AND BECKER. 

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WIND IN EXCESS OF 60 MPH...LARGE HAIL...AND DEADLY
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 600 PM EST
THURSDAY EVENING FOR NORTHEASTERN FLORIDA AND S2OUTHEAST GEORGIA.

LAT...LON 3059 8196 3049 8183 3068 8151 3074 8169

$$

JOHNSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 15, 2:46 PM EST	Severe Thunderstorm Warning	JAX	Suwannee	44 min
Mar 15, 4:15 PM EST	Severe Thunderstorm Warning	JAX	Duval	30 min
Mar 15, 4:21 PM EST	Severe Thunderstorm Warning	JAX	Gilchrist	39 min
Mar 15, 4:38 PM EST	Severe Thunderstorm Warning	JAX	Columbia	37 min
Mar 15, 4:48 PM EST	Severe Thunderstorm Warning	JAX	Alachua, Bradford, Union	42 min
Mar 15, 4:55 PM EST	Severe Thunderstorm Warning	JAX	Baker	35 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.