Alert archive / Louisiana / Tornado Warnings in 2002

Tornado Warning 22, NWS Shreveport, LA

December 18, 2002Caddo Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Dec 18, 2002, 6:42 PM CST for Caddo Parish, Louisiana. It was in force for 33 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 18, 2002, 6:42 PM CST (00:42 UTC)
Expired: Dec 18, 2002, 7:15 PM CST
In force: 33 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Caddo Parish, LA

The radar

The Shreveport radar (KSHV), 26 km from the middle of the area, began a volume at 00:46 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.

What was reported inside it

Time	Report	Where	Remark
Dec 18, 6:45 PM CST	Thunderstorm Wind 60 E	Gilliam, LA	Power lines were blown down across the town.
Dec 18, 7:10 PM CST	Tornado F1	Dixie, LA	A small supercell produced a weak tornado that moved across Dixie, LA. One trailer home had sheet metal torn off of it. An old airport hanger used for storage was destroyed with its contents strewn over two tenths of a mile. Several power poles were blown d
Dec 18, 7:16 PM CST	Thunderstorm Wind 60 E	Dixie, LA	Wind damage to a mobile home. Several power lines blown down.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Dec 18, 1:10 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.7 hours before the alert went out and 26 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: 1623 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 618 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 291 m²/s²
0-3 km storm-relative helicity: 354 m²/s²
Significant tornado parameter: 3.8
Supercell composite: 12.0

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KSHV 190042
TORSHV
LAC017-190115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
641 PM CST WED DEC 18 2002

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  CADDO PARISH IN NORTHWEST LOUISIANA

* UNTIL 715 PM CST

* AT 641 PM CST...THE SHREVEPORT NATIONAL WEATHER SERVICE DOPPLER
  RADAR INDICATED A TORNADO 8 MILES SOUTHWEST OF OIL CITY...OR ABOUT
  16 MILES SOUTH OF VIVIAN...MOVING NORTHEAST AT 40 MPH.

TORNADOES ASSOCIATED WITH THIS TYPE OF THUNDERSTORM USUALLY OCCUR ON
THE EAST...TO SOUTH...PART OF THE STORM.

REPEATING...THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
FOR...
  CADDO PARISH IN NORTHWEST LOUISIANA
UNTIL 715 PM CST.

LAT...LON 3266 9379 3287 9383 3270 9404 3251 9403

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 18, 7:15 PM CST	Tornado Warning	SHV	Bossier, Caddo	45 min
Dec 18, 8:50 PM CST	Severe Thunderstorm Warning	SHV	Webster	25 min
Dec 18, 9:14 PM CST	Flash Flood Warning	SHV	Bossier, Caddo	4 hr
Dec 18, 9:21 PM CST	Flash Flood Warning	SHV	Webster	4 hr
Dec 19, 3:18 AM CST	Tornado Warning	SHV	Bienville, Lincoln	42 min
Dec 19, 3:53 AM CST	Tornado Warning	SHV	Bienville, Natchitoches	52 min
Dec 19, 4:18 AM CST	Tornado Warning	SHV	Jackson, Lincoln	42 min
Dec 19, 6:26 AM CST	Tornado Warning	SHV	Grant	64 min

Nearby

Tornado Warnings in Louisiana, 2002 Every tornado warning in 2002 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.