Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 149
The Storm Prediction Center issued this mesoscale discussion at Feb 27, 2011, 2:12 PM CST for 9 counties in Kansas; 5 counties in Missouri; 11 counties in Oklahoma. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- Feb 27, 2011, 2:12 PM CST (20:12 UTC)
- Expired
- Feb 27, 2011, 3:45 PM CST
- In force
- 93 min
- Issued by
- the Storm Prediction Center
All 25 counties
Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Cowley County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Barton County, MO, Dade County, MO, Jasper County, MO, Lawrence County, MO, Newton County, MO, Craig County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Noble County, OK, Nowata County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Rogers County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 95 km from the middle of the area, began a volume at 20:13 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
Springfield, MO (KSGF), launched 12:00Z, 8.2 hours before the alert went out and 202 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
- 306 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 507 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 327 m²/s²
- 0-3 km storm-relative helicity
- 349 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
885 ACUS11 KWNS 272012 SWOMCD SPC MCD 272012 MOZ000-OKZ000-KSZ000-272145- MESOSCALE DISCUSSION 0149 NWS STORM PREDICTION CENTER NORMAN OK 0212 PM CST SUN FEB 27 2011 AREAS AFFECTED...NRN OK...SERN KS...SWRN MO CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE VALID 272012Z - 272145Z LEADING EDGE OF STEEPER LOW LEVEL LAPSE RATE PLUME IS DEVELOPING/SPREADING EWD ACROSS THE TX/OK PANHANDLE REGION INTO WRN OK. THIS IS AFFIRMED IN THE LATEST DIAGNOSTIC DATA WHERE DRY ADIABATIC LAPSE RATES ARE NOTED AT LEAST THROUGH 3KM. ADDITIONALLY...VIS IMAGERY INDICATES BOUNDARY LAYER CU FIELD IS DEVELOPING FROM THE OK PANHANDLE...SEWD ALONG THE OK/TX BORDER TO NEAR I-40. AS THIS CU FIELD APPROACHES A MORE MOIST/UNSTABLE AIRMASS DOWNSTREAM IT APPEARS THUNDERSTORMS SHOULD EVOLVE ACROSS THE WARM SECTOR OVER NWRN OK. SUPERCELLS ARE CERTAINLY POSSIBLE GIVEN THE VERY STRONG SHEAR AND ISOLATED TORNADOES CAN BE EXPECTED. TORNADO WATCH MAY BE WARRANTED IN THE NEXT FEW HOURS TO ACCOUNT FOR THIS EVOLVING THREAT. ..DARROW.. 02/27/2011 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SGF...TSA...ICT...OUN... LAT...LON 36839807 38019456 37289361 36509449 36109764 36839807
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 27, 12:46 PM CST | Mesoscale Discussion | SPC | Anderson, Butler, Chase, Coffey, Douglas, Franklin and 20 more | 59 min |
| Feb 27, 1:12 PM CST | Severe Thunderstorm Watch | SPC | Allen, Anderson, Butler, Chase, Coffey, Douglas and 22 more | 9 hr |
| Feb 27, 2:46 PM CST | Tornado Watch | SPC | Chautauqua, Cowley, Elk, Labette, Montgomery, Neosho and 2 more | 8 hr |
| Feb 27, 3:24 PM CST | Mesoscale Discussion | SPC | Anderson, Butler, Chase, Coffey, Douglas, Franklin and 20 more | 66 min |
| Feb 27, 5:49 PM CST | Mesoscale Discussion | SPC | Chautauqua, Cowley, Elk, Montgomery, Wilson | 56 min |
| Feb 27, 12:44 PM CST | Mesoscale Discussion | SPC | Pemiscot | 91 min |
| Feb 27, 4:57 PM CST | Mesoscale Discussion | SPC | Barry, Bollinger, Butler, Cape Girardeau, Carter, Christian and 29 more | 2 hr |
| Feb 27, 5:10 PM CST | Mesoscale Discussion | SPC | Audrain, Boone, Macon, Marion, Monroe, Pike and 3 more | 35 min |
| Feb 27, 5:33 PM CST | Severe Thunderstorm Watch | SPC | Audrain, Boone, Knox, Lewis, Marion, Monroe and 3 more | 4 hr |
| Feb 27, 5:50 PM CST | Mesoscale Discussion | SPC | Harrison, Mercer, Putnam | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Kansas, 2011Mesoscale Discussions in Missouri, 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.