Alert archive / Texas / Tornado Warnings in 2011
Tornado Warning 72, NWS Shreveport, LA
NWS Shreveport, LA issued this tornado warning at May 20, 2011, 6:38 PM CDT for Harrison County, Marion County, Texas. It was in force for 21 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
- May 20, 2011, 6:38 PM CDT (23:38 UTC)
- Expired
- May 20, 2011, 6:59 PM CDT
- In force
- 21 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties Harrison County, TX, Marion County, TX
The radar
The Shreveport radar (KSHV), 64 km from the middle of the area, began a volume at 23:40 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, 6:38 PM CDT | TORNADO | 4 Ne Hallsville, TX | AN EF0 TORNADO FIRST TOUCHED DOWN NORTHEAST OF HALLSVILLE ALONG YOUNG ROAD JUST NORTH OF OLD HWY. 80. THE STORM THEN CROSSED NOONDAY ROAD SNAPPING AND OR UPROOTING A FEW TREES. THE STORM CROSSED FM. 449 WHERE IT SNAPPED LARGE LIMBS BEFORE LIFTING JUST AS IT CR |
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, 5:56 PM CDT | Tornado Watch | SPC | 3 hr |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 11.6 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.
- 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.
980 WFUS54 KSHV 202338 TORSHV TXC203-315-210030- /O.NEW.KSHV.TO.W.0072.110520T2338Z-110521T0030Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SHREVEPORT LA 638 PM CDT FRI MAY 20 2011 THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A * TORNADO WARNING FOR... WESTERN HARRISON COUNTY IN NORTHEAST TEXAS... SOUTH CENTRAL MARION COUNTY IN NORTHEAST TEXAS... * UNTIL 730 PM CDT * AT 636 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO JUST NORTHEAST OF HALLSVILLE...OR 11 MILES WEST OF MARSHALL...MOVING NORTHEAST AT 25 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HARLETON AND WOODLAWN... PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO SAFE STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT AND COVER YOUR HEAD. && LAT...LON 3279 9449 3265 9421 3242 9455 3255 9469 TIME...MOT...LOC 2338Z 220DEG 21KT 3257 9454 $$ VII
2 follow-up statements
394 WWUS54 KSHV 202346 SVSSHV SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 646 PM CDT FRI MAY 20 2011 TXC203-315-210030- /O.CON.KSHV.TO.W.0072.000000T0000Z-110521T0030Z/ HARRISON TX-MARION TX- 646 PM CDT FRI MAY 20 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR MARION AND HARRISON COUNTIES... AT 645 PM CDT...DOPPLER RADAR CONTINUED TO SHOW STRONG INDICATION OF A TORNADO JUST NORTHWEST OF NESBITT...MOVING NORTHEAST AT 35 MPH. IF YOU LIVE IN THE NESBITT OR WOODLAWN AREAS...TAKE COVER IMMEDIATELY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM... MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. && LAT...LON 3252 9446 3259 9461 3279 9449 3265 9421 TIME...MOT...LOC 2345Z 213DEG 31KT 3262 9447 $$ 13
497 WWUS54 KSHV 202359 SVSSHV SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SHREVEPORT LA 659 PM CDT FRI MAY 20 2011 TXC203-315-210008- /O.CAN.KSHV.TO.W.0072.000000T0000Z-110521T0030Z/ HARRISON TX-MARION TX- 659 PM CDT FRI MAY 20 2011 ...THE TORNADO WARNING FOR MARION AND HARRISON COUNTIES IS CANCELLED... ALTHOUGH THIS THUNDERSTORM HAS NOT COMPLETELY DISSIPATED...THERE IS NO LONGER EVIDENCE OF ROTATION WITH THIS STORM. LAT...LON 3252 9446 3259 9461 3279 9449 3265 9421 TIME...MOT...LOC 2358Z 213DEG 31KT 3271 9440 $$ VII
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, 5:27 PM CDT | Tornado Warning | SHV | Red River | 48 min |
| May 20, 5:53 PM CDT | Severe Thunderstorm Warning | SHV | Gregg, Harrison, Marion, Rusk | 52 min |
| May 20, 6:55 PM CDT | Severe Thunderstorm Warning | SHV | Bowie, Red River | 47 min |
Nearby
Tornado Warnings in Texas, 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.