Alert archive / Texas / Tornado Warnings in 2011
Tornado Warning 70, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at May 20, 2011, 5:27 PM CDT for Red River County, Texas; McCurtain County, Oklahoma. It was in force for 48 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
- May 20, 2011, 5:27 PM CDT (22:27 UTC)
- Expired
- May 20, 2011, 6:15 PM CDT
- In force
- 48 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties McCurtain County, OK, Red River County, TX
The radar
The Western Arkansas radar (KSRX), 171 km from the middle of the area, began a volume at 22:30 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 |
|---|---|---|---|
| May 20, 5:36 PM CDT | TORNADO | 10 S Valliant, TX | A EF0 TORNADO BRIEFLY TOUCHED DOWN NORTHEAST OF MANCHESTER TEXAS ALONG FM 195 KNOCKING DOWN A FEW SMALL TREES AND SNAPPING LARGE BRANCHES. THE WEAK TORNADO WAS ON THE GROUND FOR 1.5 MILES AND WAS APPROXIMATELY 50 YARDS WIDE. |
| May 20, 5:50 PM CDT | HAIL 1.75 | 2 Se Valliant, OK | |
| May 20, 5:51 PM CDT | FUNNEL CLOUD | 5 Sw Garvin, OK | SHERIFF OFFICE REPORTING A FUNNEL CLOUD IN SOUTHWESTERN MCCURTAIN COUNTY |
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 |
|---|---|---|---|
| May 20, 11:03 AM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 10.5 hours before the alert went out and 199 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
- 2656 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 648 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 151 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
158 WFUS54 KSHV 202227 TORSHV OKC089-TXC387-202315- /O.NEW.KSHV.TO.W.0070.110520T2227Z-110520T2315Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 527 PM CDT FRI MAY 20 2011 THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A * TORNADO WARNING FOR... NORTH CENTRAL RED RIVER COUNTY IN NORTHEAST TEXAS... SOUTHWESTERN MCCURTAIN COUNTY IN SOUTHEAST OKLAHOMA... * UNTIL 615 PM CDT * AT 526 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR MANCHESTER...OR 13 MILES NORTHWEST OF CLARKSVILLE...MOVING NORTHEAST AT 25 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO NEGLEY...SILVER CITY...REDLAND...ALBION AND FARMERS HILL. 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 3402 9507 3386 9487 3369 9517 3377 9528 TIME...MOT...LOC 2226Z 222DEG 13KT 3377 9518 $$ 13
2 follow-up statements
745 WWUS54 KSHV 202241 SVSSHV SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 541 PM CDT FRI MAY 20 2011 OKC089-TXC387-202315- /O.CON.KSHV.TO.W.0070.000000T0000Z-110520T2315Z/ MCCURTAIN OK-RED RIVER TX- 541 PM CDT FRI MAY 20 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR RED RIVER AND MCCURTAIN COUNTIES... AT 541 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO DETECT A TORNADO. THIS TORNADO WAS LOCATED NEAR SILVER CITY...OR 16 MILES NORTH OF CLARKSVILLE...MOVING NORTHEAST AT 35 MPH. OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO FARMERS HILL PRECAUTIONARY/PREPAREDNESS ACTIONS... HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE. && 13 LAT...LON 3378 9511 3383 9518 3402 9507 3386 9487 TIME...MOT...LOC 2241Z 224DEG 31KT 3387 9506 $$
602 WWUS54 KSHV 202248 SVSSHV SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 548 PM CDT FRI MAY 20 2011 OKC089-TXC387-202315- /O.CON.KSHV.TO.W.0070.000000T0000Z-110520T2315Z/ MCCURTAIN OK-RED RIVER TX- 548 PM CDT FRI MAY 20 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR RED RIVER AND MCCURTAIN COUNTIES... AT 547 PM CDT...DOPPLER RADAR CONTINUED TO INDICATE A TORNADO ON THE RED RIVER COUNTY...MCCURTAIN COUNTY LINE OVER THE RED RIVER JUST SOUTHWEST OF THE FARMERS HILL COMMUNITY. THIS STORM IS MOVING NORTHEAST AT 35 MPH. THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE. && LAT...LON 3382 9507 3389 9513 3399 9503 3386 9487 TIME...MOT...LOC 2247Z 244DEG 43KT 3389 9502 $$ 13
The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 4:58 PM CDT | Severe Thunderstorm Warning | SHV | Smith, Upshur | 36 min |
| May 20, 5:02 PM CDT | Severe Thunderstorm Warning | SHV | Gregg, Harrison, Rusk | 43 min |
| May 20, 5:53 PM CDT | Severe Thunderstorm Warning | SHV | Gregg, Harrison, Marion, Rusk | 52 min |
| May 20, 6:38 PM CDT | Tornado Warning | SHV | Harrison, Marion | 21 min |
| May 20, 6:55 PM CDT | Severe Thunderstorm Warning | SHV | Bowie, Red River | 47 min |
| May 20, 5:59 PM CDT | Tornado Warning | SHV | McCurtain | 21 min |
Nearby
Tornado Warnings in Texas, 2011Tornado 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.