Alert archive / Florida / Tornado Warnings in 2002

Tornado Warning 20, NWS Jacksonville, FL

November 12, 2002Saint Johns County, Florida

NWS Jacksonville, FL issued this tornado warning at Nov 12, 2002, 2:19 PM EST for Saint Johns County, Florida. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Nov 12, 2002, 2:19 PM EST (19:19 UTC)
Expired
Nov 12, 2002, 3:00 PM EST
In force
41 min
Issued by
NWS Jacksonville, FL
Area
Whole counties

County Saint Johns County, FL

The radar

The Jacksonville radar (KJAX), 70 km from the middle of the area, began a volume at 19:19 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, 7.3 hours before the alert went out and 71 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-pSkew-T log-p diagram, Jacksonville, FL at 12:00Z on 2002-11-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2355 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jacksonville, FL at 12:00Z on 2002-11-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2355 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
469 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
1.1
Supercell composite
5.4

Open this sounding in Storm Lab

The text

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

230 
WFUS52 KJAX 121919
TORJAX
FLC109-122000-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE JACKSONVILLE FL
218 PM EST TUE NOV 12 2002

THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A

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

* UNTIL 300 PM EST

* AT 214 PM EST EMERGENCY MANAGEMENT REPORTED A TORNADO AT HIGHWAY 210 
AND I-95.  MOVEMENT IS TO THE NORTHEAST AT 30 MPH.  

TAKE COVER NOW IF YOU ARE IN THE PATH OF THIS STORM


LAT...LON 2982 8156 2969 8141 3000 8100 3017 8120
$$
MZ

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 12, 2:13 AM ESTSevere Thunderstorm WarningJAX47 min
Nov 12, 2:34 AM ESTTornado WarningJAXHamilton10 hr
Nov 12, 2:34 AM ESTTornado WarningJAXHamilton, Suwannee10 hr
Nov 12, 3:04 AM ESTSevere Thunderstorm WarningJAX56 min
Nov 12, 3:59 AM ESTSevere Thunderstorm WarningJAX46 min
Nov 12, 11:14 AM ESTSevere Thunderstorm WarningJAX46 min
Nov 12, 11:28 AM ESTTornado WarningJAXBaker42 days
Nov 12, 12:18 PM ESTTornado WarningJAXAlachua27 min
Nov 12, 12:58 PM ESTSevere Thunderstorm WarningJAX32 min
Nov 12, 1:07 PM ESTSpecial Marine WarningJAX113 min
Nov 12, 1:23 PM ESTSevere Thunderstorm WarningJAX22 min
Nov 12, 1:30 PM ESTTornado WarningJAXDuval42 days
Nov 12, 2:41 PM ESTSpecial Marine WarningJAX2 hr

Nearby

Tornado Warnings in Florida, 2002Every tornado warning in 2002Tornadoes in 2002

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.