Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 15, NWS Shreveport, LA

March 21, 2012Grant Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Mar 21, 2012, 2:49 AM CDT for Grant Parish, Winn Parish, Louisiana. It was in force for 26 min. 1 report 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: Mar 21, 2012, 2:49 AM CDT (07:49 UTC)
Expired: Mar 21, 2012, 3:15 AM CDT
In force: 26 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Grant Parish, LA, Winn Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 21, 3:15 AM CDT	TORNADO	2 S Sikes, LA	AN EF0 TORNADO BRIEFLY TOUCHED DOWN ALONG HWY. 499. A FEW TREES WERE SNAPPED ON THE WEST SIDE OF THE HWY. NEAR PARISH ROAD 1134 AND HWY. 499 INTERSECTION. THE TORNADO WAS MOVING NORTH NORTHEAST AND LIFTED IN A CLEARING BEFORE REACHING THE COMMUNITY OF SIKES. P

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 20, 10:59 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 7.8 hours before the alert went out and 228 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: 267 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1256 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

799 
WFUS54 KSHV 210749
TORSHV
LAC043-127-210815-
/O.NEW.KSHV.TO.W.0015.120321T0749Z-120321T0815Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
249 AM CDT WED MAR 21 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL GRANT PARISH IN NORTH CENTRAL LOUISIANA...
  EASTERN WINN PARISH IN NORTH CENTRAL LOUISIANA...

* UNTIL 315 AM CDT

* AT 248 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 23 MILES SOUTH
  OF SIKES...OR 14 MILES SOUTHEAST OF WINNFIELD...MOVING NORTH AT 50
  MPH.

* THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
  INDICATED PARISHES.

LAT...LON 3170 9245 3173 9263 3215 9254 3210 9231
      3206 9231
TIME...MOT...LOC 0748Z 195DEG 44KT 3177 9253

$$

13

1 follow-up statement

892 
WWUS54 KSHV 210759
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
259 AM CDT WED MAR 21 2012

LAC043-210808-
/O.CAN.KSHV.TO.W.0015.000000T0000Z-120321T0815Z/
GRANT LA-
259 AM CDT WED MAR 21 2012

...THE TORNADO WARNING FOR GRANT PARISH IS CANCELLED...

LAT...LON 3180 9245 3181 9258 3215 9254 3210 9231
      3206 9231
TIME...MOT...LOC 0758Z 196DEG 35KT 3186 9250

$$

LAC127-210815-
/O.CON.KSHV.TO.W.0015.000000T0000Z-120321T0815Z/
WINN LA-
259 AM CDT WED MAR 21 2012

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 315 AM CDT FOR WINN
PARISH...

AT 258 AM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED 17 MILES SOUTH OF SIKES...OR 10 MILES SOUTHEAST OF 
WINNFIELD...MOVING NORTH NORTHEAST AT 40 MPH.

COLGRADE AND SIKES ARE IN THE PATH OF THIS STORM. TAKE COVER 
IMMEDIATELY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY 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 3180 9245 3181 9258 3215 9254 3210 9231
      3206 9231
TIME...MOT...LOC 0758Z 196DEG 35KT 3186 9250

$$

13

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 8:55 PM CDT	Flash Flood Warning Emergency	SHV	Grant, Natchitoches, Sabine, Winn	10 hr
Mar 20, 9:02 PM CDT	River Flood Warning	SHV	Bienville, Bossier, Red River, Webster	11 days
Mar 20, 9:03 PM CDT	Tornado Warning	SHV	Natchitoches	27 min
Mar 20, 9:15 PM CDT	Flash Flood Warning	SHV	Bienville, De Soto, Red River	9 hr
Mar 20, 9:24 PM CDT	Tornado Warning	SHV	Natchitoches	36 min
Mar 20, 10:20 PM CDT	Tornado Warning	SHV	Grant, Natchitoches	40 min
Mar 20, 10:50 PM CDT	Flash Flood Warning	SHV	Bossier, Claiborne, Webster	10 hr
Mar 21, 1:52 AM CDT	Flash Flood Warning	SHV	Bienville, Jackson, Lincoln, Union	8 hr
Mar 21, 3:14 AM CDT	Tornado Warning	SHV	Jackson, Winn	46 min
Mar 21, 5:41 AM CDT	Tornado Warning	SHV	Jackson, Winn	34 min
Mar 21, 6:16 AM CDT	Flash Flood Warning	SHV	Bienville, Red River	3 hr
Mar 21, 6:47 AM CDT	Flash Flood Warning Emergency	SHV	Grant, Natchitoches, Red River, Sabine, Winn	4 hr
Mar 21, 8:44 AM CDT	Flash Flood Warning	SHV	Claiborne	2 hr
Mar 21, 9:36 AM CDT	Flash Flood Warning	SHV	Union	114 min
Mar 21, 10:51 AM CDT	Flash Flood Warning Emergency	SHV	Grant, Natchitoches, Winn	3 hr
Mar 21, 1:53 PM CDT	Areal Flood Warning	SHV	Natchitoches	6 hr

Nearby

Tornado Warnings in Louisiana, 2012 Every tornado warning in 2012 Tornadoes in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.