Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 1133
The Storm Prediction Center issued this mesoscale discussion at Jun 11, 2012, 11:29 PM CDT for 14 counties in Oklahoma; Grayson County, Texas. It was in force for 61 min.
The area
The outline as issued.
The facts
- Issued
- Jun 11, 2012, 11:29 PM CDT (04:29 UTC)
- Expired
- Jun 12, 2012, 12:30 AM CDT
- In force
- 61 min
- Issued by
- the Storm Prediction Center
Counties Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, Marshall County, OK, Murray County, OK, Pittsburg County, OK, Pontotoc County, OK, Pushmataha County, OK, Sequoyah County, OK, Grayson County, TX
The radar
The Norman radar (KTLX), 142 km from the middle of the area, began a volume at 04:32 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
Norman, OK (KOUN), launched 00:00Z, 4.5 hours before the alert went out and 144 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
- 3372 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1193 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 189 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 9.7
The text
As transmitted, in the capitals the NWS used until 2016.
509 ACUS11 KWNS 120430 SWOMCD SPC MCD 120429 ARZ000-OKZ000-TXZ000-120530- MESOSCALE DISCUSSION 1133 NWS STORM PREDICTION CENTER NORMAN OK 1129 PM CDT MON JUN 11 2012 AREAS AFFECTED...SRN OK...SWRN AR...NRN TX CONCERNING...SEVERE THUNDERSTORM WATCH 377... VALID 120429Z - 120530Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 377 CONTINUES. SUMMARY...NUMEROUS SHOWERS/THUNDERSTORMS ARE DEVELOPING ACROSS SRN OK/RED RIVER REGION OF TX. MCS SHOULD SPREAD ESEWD INTO THE EARLY-MID MORNING HOURS. DISCUSSION...COMPLEX ARRAY OF TSTMS HAS EVOLVED ALONG THE RED RIVER. MUCH OF THIS ACTIVITY DEVELOPED WITHIN INTENSE CORRIDOR OF HEATING NEAR THE SFC WIND SHIFT OVER NWRN TX BUT NUMEROUS LEFT SPLITS AND INCREASING WARM ADVECTION HAS DISPLACED THE CONVECTIVE COMPLEX INTO SRN OK. SIGNIFICANT OUTFLOW IS RACING NWD ACROSS SWRN OK AND THIS MAY AID IN FURTHER DEVELOPMENT. GIVEN THE AREAL EXPANSION OBSERVED OVER THE LAST HOUR IT APPEARS AN MCS MAY BE EVOLVING THAT WITH TIME SHOULD BEGIN TO TURN/SPREAD ESEWD TOWARD THE ARKLATEX. ASIDE FROM ISOLATED LARGE HAIL HEAVY RAIN WILL BE THE GREATEST THREAT WITH THESE DEVELOPMENT STORMS. ..DARROW.. 06/12/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...SHV...TSA...FWD...OUN... LAT...LON 34659715 35629446 34319446 33369715 34659715
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 7:38 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 13 more | 67 min |
| Jun 11, 9:25 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 10 more | 7 hr |
| Jun 11, 11:52 PM CDT | Severe Thunderstorm Watch | SPC | McCurtain | 6 hr |
| Jun 12, 10:32 AM CDT | Mesoscale Discussion | SPC | Carter, Cotton, Jefferson, Love, Marshall, Murray and 1 more | 88 min |
| Jun 12, 2:02 PM CDT | Mesoscale Discussion | SPC | Cimarron | 88 min |
| Jun 12, 2:16 PM CDT | Severe Thunderstorm Watch | SPC | Cimarron | 8 hr |
| Jun 12, 5:42 PM CDT | Mesoscale Discussion | SPC | Cimarron | 63 min |
| Jun 11, 7:11 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Clay, Coke, Coleman, Collin and 29 more | 94 min |
| Jun 11, 9:54 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Brown, Callahan, Clay, Coke and 31 more | 66 min |
| Jun 12, 2:54 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 3 more | 96 min |
| Jun 12, 3:21 AM CDT | Severe Thunderstorm Watch | SPC | Bowie, Cass, Gregg, Harrison, Marion, Morris and 8 more | 8 hr |
| Jun 12, 4:08 AM CDT | Mesoscale Discussion | SPC | Armstrong, Bailey, Briscoe, Castro, Childress, Deaf Smith and 9 more | 2 hr |
| Jun 12, 6:08 AM CDT | Mesoscale Discussion | SPC | Nacogdoches, Panola, Shelby | 2 hr |
| Jun 12, 7:11 AM CDT | Severe Thunderstorm Watch | SPC | Hardin, Jasper, Jefferson, Newton, Orange, Tyler | 8 hr |
| Jun 12, 9:23 AM CDT | Mesoscale Discussion | SPC | Nacogdoches, Sabine, San Augustine, Shelby | 67 min |
| Jun 12, 11:00 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Bosque, Brown, Callahan, Collin and 36 more | 6 hr |
| Jun 12, 12:12 PM CDT | Mesoscale Discussion | SPC | Chambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more | 63 min |
| Jun 12, 2:45 PM CDT | Mesoscale Discussion | SPC | Coke, Coleman, Concho, Glasscock, Midland, Mitchell and 4 more | 60 min |
| Jun 12, 3:00 PM CDT | Mesoscale Discussion | SPC | Andrews, Bailey, Cochran, Crane, Ector, Gaines and 7 more | 60 min |
| Jun 12, 3:28 PM CDT | Mesoscale Discussion | SPC | Anderson, Bell, Bosque, Brazos, Brown, Burleson and 37 more | 62 min |
| Jun 12, 3:44 PM CDT | Severe Thunderstorm Watch | SPC | Andrews, Bailey, Cochran, Crane, Culberson, Ector and 13 more | 8 hr |
| Jun 12, 3:56 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Austin, Bell, Brazoria, Brazos, Burleson and 24 more | 4 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Texas, 2012Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.