Alert archive / Texas / Mesoscale Discussions in 2011
Mesoscale Discussion 1439
The Storm Prediction Center issued this mesoscale discussion at Jun 28, 2011, 6:09 PM CDT for 4 states. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Jun 28, 2011, 6:09 PM CDT (23:09 UTC)
- Expired
- Jun 28, 2011, 7:45 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 46 counties
Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Union Parish, LA, Webster Parish, LA, Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Murray County, OK, Pontotoc County, OK, Pushmataha County, OK, Bowie County, TX, Camp County, TX, Cass County, TX, Collin County, TX, Cooke County, TX, Delta County, TX, Fannin County, TX, Franklin County, TX, Grayson County, TX, Harrison County, TX, Hopkins County, TX, Hunt County, TX, Lamar County, TX, Marion County, TX, Morris County, TX, Rains County, TX, Red River County, TX, Titus County, TX, Upshur County, TX, Wood County, TX
The radar
The Western Arkansas radar (KSRX), 194 km from the middle of the area, began a volume at 23:09 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.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 11.2 hours before the alert went out and 201 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
- 1494 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 869 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- -47 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
663
ACUS11 KWNS 282309
SWOMCD
SPC MCD 282309
LAZ000-ARZ000-TXZ000-OKZ000-290045-
MESOSCALE DISCUSSION 1439
NWS STORM PREDICTION CENTER NORMAN OK
0609 PM CDT TUE JUN 28 2011
AREAS AFFECTED...SERN OK...NERN TX...SWRN AR...NWRN LA
CONCERNING...SEVERE THUNDERSTORM WATCH 571...572...
VALID 282309Z - 290045Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
571...572...CONTINUES.
SEVERE THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG THE INTERSECTION
OF A RESIDUAL OUTFLOW BOUNDARY FROM EARLIER CONVECTION AND A SFC
FRONTAL BOUNDARY MAINLY ACROSS SERN OK INTO NERN TX. BEHIND THE
OUTFLOW BOUNDARY...SOME ELEVATED STORMS WILL BE POSSIBLE ACROSS
PARTS OF SRN AR INTO NWRN LA. THESE STORMS MAY BRIEFLY PULSE AND
BECOME STRONG BUT LIKELY WILL NOT BE SEVERE GIVEN THE AIR MASS HAS
BECOME LESS SUPPORTIVE FOR SEVERE DEEP CONVECTION WITH TEMPERATURES
IN THE 70S AND LACKLUSTER MLCAPE LESS THAN 1500 J/KG.
MUCH OF WW 571 WILL LIKELY BE ALLOWED TO EXPIRE AT 00Z...ESPECIALLY
THOSE PORTIONS OVER AR AND LA. HOWEVER...A LOCAL EXTENSION IN SPACE
AND TIME MAY BE NEEDED OVER NERN TX GIVEN CURRENT STRENGTH AND
MOTION OF THE STORM MOVING OUT OF MCCURTAIN COUNTY OK INTO RIVER
COUNTY TX. GIVEN STORM MOTION TO THE S/SW...THERE MAY BE A NEED FOR
COUNTIES TO BE ADDED TO WW 572 AT SOME POINT AS WELL THIS EVENING.
..LEITMAN.. 06/28/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SHV...TSA...FWD...OUN...
LAT...LON 34539724 34979615 34429432 33089213 32369266 32589528
33389743 34539724SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 7:05 PM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Fulton and 9 more | 115 min |
| Jun 28, 4:08 AM CDT | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 25 more | 82 min |
| Jun 28, 4:17 AM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Carroll, Clay, Cleburne, Craighead and 20 more | 8 hr |
| Jun 28, 6:34 AM CDT | Mesoscale Discussion | SPC | Arkansas, Clay, Cleburne, Conway, Craighead, Crittenden and 28 more | 86 min |
| Jun 28, 7:06 AM CDT | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleveland, Conway and 22 more | 5 hr |
| Jun 28, 9:52 AM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Dallas, Drew and 1 more | 113 min |
| Jun 28, 10:26 AM CDT | Severe Thunderstorm Watch | SPC | Ashley, Chicot | 8 hr |
| Jun 28, 11:42 AM CDT | Mesoscale Discussion | SPC | Bradley, Calhoun, Clark, Columbia, Dallas, Garland and 13 more | 93 min |
| Jun 28, 11:51 AM CDT | Severe Thunderstorm Watch | SPC | Bradley, Calhoun, Clark, Cleveland, Columbia, Conway and 28 more | 7 hr |
| Jun 28, 3:09 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Clark, Cleveland, Columbia and 27 more | 96 min |
| Jun 28, 3:19 PM CDT | Mesoscale Discussion | SPC | Concordia, Tensas | 116 min |
| Jun 28, 3:29 PM CDT | Mesoscale Discussion | SPC | Cimarron | 91 min |
| Jun 28, 3:53 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Johnston and 8 more | 7 hr |
Nearby
Mesoscale Discussions in Texas, 2011Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Arkansas, 2011Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.