Alert archive / Florida / Tornado Warnings in 2004

Tornado Warning 97, NWS Jacksonville, FL

September 26, 2004Nassau County, Florida

NWS Jacksonville, FL issued this tornado warning at Sep 26, 2004, 4:59 PM EDT for Nassau County, Florida. It was in force for 16 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 26, 2004, 4:59 PM EDT (20:59 UTC)
Expired: Sep 26, 2004, 5:15 PM EDT
In force: 16 min
Issued by: NWS Jacksonville, FL
Area: Counties, with a storm outline in the text

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 21 km from the middle of the area, began a volume at 21:00 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
Sep 26, 4:50 AM EDT	Tornado Watch	SPC	12 hr
Sep 26, 4:25 PM EDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 9.0 hours before the alert went out and 20 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: 1022 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 577 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 287 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 6.4

Open this sounding in Storm Lab

The text

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

000 
WFUS52 KJAX 262100
TORJAX
FLC089-262115-
/X.NEW.KJAX.TO.W.0006.040926T2059Z-040926T2115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
459 PM EDT SUN SEP 26 2004

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS EXTENDED THE

* TORNADO WARNING FOR...
  NASSAU COUNTY IN NORTHEAST FLORIDA

* UNTIL 515 PM EDT

* AT 454 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO NEAR AMELIA CITY...OR ABOUT 6 MILES SOUTH OF
  FERNANDINA BEACH...MOVING WEST AT 50 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  YULEE.

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 3056 8146 3063 8144 3069 8164 3060 8167

$$

ZIBURA

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 26, 12:28 AM EDT	Tornado Warning	JAX	Flagler	32 min
Sep 26, 11:43 AM EDT	Tornado Warning	JAX	Flagler	47 min
Sep 26, 2:34 PM EDT	Tornado Warning	JAX	Saint Johns	41 min
Sep 26, 4:46 PM EDT	Tornado Warning	JAX	Nassau	14 min
Sep 26, 5:07 PM EDT	Tornado Warning	JAX	Duval, Saint Johns	38 min
Sep 26, 6:59 PM EDT	Tornado Warning	JAX	Saint Johns	31 min
Sep 26, 7:12 PM EDT	Tornado Warning	JAX	Duval	18 min
Sep 26, 7:22 PM EDT	Tornado Warning	JAX	Duval, Saint Johns	23 min
Sep 26, 7:54 PM EDT	Tornado Warning	JAX	Duval, Nassau, Saint Johns	51 min

Nearby

Tornado Warnings in Florida, 2004 Every tornado warning in 2004 Tornadoes in 2004

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.