Alert archive / Florida / Tornado Warnings in 2003

Tornado Warning 1, NWS Jacksonville, FL

March 13, 2003Saint Johns County, Florida

NWS Jacksonville, FL issued this tornado warning at Mar 13, 2003, 7:45 AM EST for Saint Johns County, Florida. It was in force for 30 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: Mar 13, 2003, 7:45 AM EST (12:45 UTC)
Expired: Mar 13, 2003, 8:15 AM EST
In force: 30 min
Issued by: NWS Jacksonville, FL
Area: Counties, with a storm outline in the text

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 78 km from the middle of the area, began a volume at 12:48 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 nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 0.8 hours before the alert went out and 79 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: 407 J/kg
Mixed-layer CIN: -146 J/kg
Mixed-layer LCL: 1235 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

207 
WFUS52 KJAX 131245
TORJAX
FLC109-131315-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
745 AM EST THU MAR 13 2003

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

* TORNADO WARNING FOR...
  ST. JOHNS COUNTY IN NORTHEAST FLORIDA

* UNTIL 815 AM EST

* AT 743 AM EST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  DEVELOPING TORNADO OVER ST. AUGUSTINE SOUTH...OR ABOUT 3 MILES WEST
  OF ST. AUGUSTINE BEACH...MOVING NORTHEAST AT 30 MPH.

* SOME LOCATIONS NEAR THE PATH OF THE STORM THROUGH 815 AM EST...
  ST. AUGUSTINE SOUTH AND ST. AUGUSTINE BEACH...
  ST. AUGUSTINE AND VILANO BEACH...

VERY LARGE HAIL IS POSSIBLE WITH THE PARENT THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...TAKE COVER.

LAT...LON 2987 8146 2972 8134 2994 8090 3013 8104
$$

PETERSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 13, 6:17 AM EST	Severe Thunderstorm Warning	JAX	Putnam	28 min
Mar 13, 6:46 AM EST	Severe Thunderstorm Warning	JAX	Clay, Putnam	44 min
Mar 13, 7:03 AM EST	Severe Thunderstorm Warning	JAX	Saint Johns	42 min
Mar 13, 7:33 AM EST	Special Marine Warning	JAX		57 min
Mar 13, 8:24 AM EST	Special Marine Warning	JAX		96 min
Mar 13, 10:25 AM EST	Special Marine Warning	JAX		50 min
Mar 13, 10:48 AM EST	Severe Thunderstorm Warning	JAX	Baker, Columbia	42 min
Mar 13, 11:37 AM EST	Special Marine Warning	JAX		83 min
Mar 13, 11:55 AM EST	Severe Thunderstorm Warning	JAX	Duval, Nassau	50 min
Mar 13, 12:19 PM EST	Severe Thunderstorm Warning	JAX	Clay	41 min
Mar 13, 12:39 PM EST	Severe Thunderstorm Warning	JAX	Duval	51 min
Mar 13, 12:40 PM EST	Special Marine Warning	JAX		95 min
Mar 13, 12:58 PM EST	Tornado Warning	JAX	Duval	32 min
Mar 13, 1:09 PM EST	Severe Thunderstorm Warning	JAX	Saint Johns	36 min
Mar 13, 1:28 PM EST	Special Marine Warning	JAX		47 min
Mar 13, 1:50 PM EST	Severe Thunderstorm Warning	JAX	Clay, Saint Johns	40 min
Mar 13, 2:56 PM EST	Severe Thunderstorm Warning	JAX	Saint Johns	34 min
Mar 13, 2:59 PM EST	Special Marine Warning	JAX		46 min

Nearby

Tornado Warnings in Florida, 2003 Every tornado warning in 2003 Tornadoes in 2003

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.