Alert archive / Oklahoma / Tornado Warnings in 2011
Tornado Warning 83, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at Nov 8, 2011, 1:57 PM CST for McCurtain County, Oklahoma. It was in force for 33 min. 2 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
- Nov 8, 2011, 1:57 PM CST (19:57 UTC)
- Expired
- Nov 8, 2011, 2:30 PM CST
- In force
- 33 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
County McCurtain County, OK
The radar
The Western Arkansas radar (KSRX), 140 km from the middle of the area, began a volume at 20:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Nov 8, 2:01 PM CST | TORNADO | Valliant, OK | TORNADO REPORTED IN DOWNTOWN VALLIANT, OK. NO DAMAGE REPORTED YET, MOVING NORTHEAST AT 40 MPH. |
| Nov 8, 2:27 PM CST | TORNADO | Valliant, OK | RAILROAD CARS OVERTURNED ON EAST SIDE OF TOWN. |
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 |
|---|---|---|---|
| Nov 8, 10:49 AM CST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 8.0 hours before the alert went out and 217 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.
- Mixed-layer CAPE
- 12 J/kg
- Mixed-layer CIN
- -185 J/kg
- Mixed-layer LCL
- 496 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 296 m²/s²
- 0-3 km storm-relative helicity
- 361 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
541 WFUS54 KSHV 081957 TORSHV OKC089-082030- /O.NEW.KSHV.TO.W.0083.111108T1957Z-111108T2030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 157 PM CST TUE NOV 8 2011 THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A * TORNADO WARNING FOR... WEST CENTRAL MCCURTAIN COUNTY IN SOUTHEAST OKLAHOMA... * UNTIL 230 PM CST * AT 152 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR VALLIANT... OR 23 MILES EAST OF HUGO...MOVING NORTHEAST AT 35 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO SLIM...WRIGHT CITY AND GLOVER... PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM... MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. && LAT...LON 3430 9501 3413 9474 3395 9502 3402 9516 TIME...MOT...LOC 1957Z 217DEG 32KT 3404 9508 $$ 23
1 follow-up statement
389 WWUS54 KSHV 082014 SVSSHV SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 214 PM CST TUE NOV 8 2011 OKC089-082030- /O.CON.KSHV.TO.W.0083.000000T0000Z-111108T2030Z/ MCCURTAIN OK- 214 PM CST TUE NOV 8 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CST FOR MCCURTAIN COUNTY... AT 210 PM CST...LOCAL LAW ENFORCEMENT AND EMERGENCY MANAGERS REPORTED A TORNADO. THIS TORNADO WAS LOCATED NEAR WRIGHT CITY...MOVING NORTHEAST AT 35 MPH. THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM...AND A TORNADO MAY ALREADY BE OCCURRING. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. && LAT...LON 3400 9497 3406 9513 3430 9501 3413 9474 TIME...MOT...LOC 2013Z 217DEG 32KT 3415 9498 $$ 03
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 8, 2:31 PM CST | Tornado Warning | SHV | McCurtain | 44 min |
Nearby
Tornado Warnings in Oklahoma, 2011Every tornado warning in 2011Tornadoes in 2011
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; radar from the NEXRAD Level II archive.