Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 2188
The Storm Prediction Center issued this mesoscale discussion at Sep 18, 2011, 2:45 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2011, 2:45 PM CDT (19:45 UTC)
- Expired
- Sep 18, 2011, 4:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 29 counties
Benton County, AR, Crawford County, AR, Sebastian County, AR, Washington County, AR, Cherokee County, KS, Labette County, KS, Jasper County, MO, McDonald County, MO, Newton County, MO, Adair County, OK, Atoka County, OK, Cherokee County, OK, Craig County, OK, Delaware County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Mayes County, OK, McIntosh County, OK, Muskogee County, OK, Nowata County, OK, Okmulgee County, OK, Ottawa County, OK, Pittsburg County, OK, Pushmataha County, OK, Rogers County, OK, Sequoyah County, OK, Tulsa County, OK, Wagoner County, OK
The radar
The Tulsa radar (KINX), 51 km from the middle of the area, began a volume at 19:46 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, 7.8 hours before the alert went out and 178 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1001 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 228 m²/s²
- 0-3 km storm-relative helicity
- 350 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
294
ACUS11 KWNS 181946
SWOMCD
SPC MCD 181945
ARZ000-MOZ000-OKZ000-KSZ000-182145-
MESOSCALE DISCUSSION 2188
NWS STORM PREDICTION CENTER NORMAN OK
0245 PM CDT SUN SEP 18 2011
AREAS AFFECTED...ERN OK...PARTS OF SE KS/SW MO/WRN AR
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 181945Z - 182145Z
TRENDS ARE BEING MONITORED FOR AN INCREASING SEVERE THREAT THAT
COULD REQUIRE A WATCH...POSSIBLY WITHIN THE NEXT HOUR OR TWO.
WITHIN LARGER SCALE UPPER TROUGHING LIFTING OUT OF THE CENTRAL/
SOUTHERN HIGH PLAINS...AN AREA OF STRONGER FORCING FOR ASCENT
ASSOCIATED WITH AN EMBEDDED LOBE OF CYCLONIC VORTICITY IS NOW
SPREADING EAST OF THE TEXAS/OKLAHOMA PANHANDLE REGION TOWARD THE
OZARKS. THIS MAY CONTRIBUTE TO INCREASING STORM DEVELOPMENT BY THE
21-23Z TIME FRAME...ACROSS PARTS OF EASTERN OKLAHOMA INTO ADJACENT
SOUTHEAST KANSAS/SOUTHWEST MISSOURI AND WESTERN ARKANSAS...WHERE
DESTABILIZATION IS ONGOING...AND WARM ADVECTION IS ENHANCED ON THE
NOSE OF AN AXIS OF STRONGER SURFACE HEATING EXTENDING NORTHEASTWARD
OUT OF CENTRAL TEXAS. VERTICAL SHEAR IS STILL FAIRLY MODEST...BUT
MODEL GUIDANCE IS SUGGESTIVE THAT SOME STRENGTHENING OF MID-LEVEL
FLOW COULD OCCUR LATE THIS AFTERNOON...WHICH MAY BECOME SUPPORTIVE
OF ORGANIZED CONVECTIVE DEVELOPMENT...PERHAPS AN ISOLATED SUPERCELL
OR TWO.
..KERR.. 09/18/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...LZK...SGF...SHV...TSA...ICT...OUN...
LAT...LON 35559633 36519598 37269555 37289425 36479369 35079405
34089488 34409608 35559633SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 8 hr |
| Sep 18, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Clark, Columbia, Conway, Garland, Hempstead and 19 more | 7 hr |
| Sep 18, 6:48 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Conway, Crawford, Garland, Howard and 11 more | 57 min |
| Sep 17, 10:17 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Cherokee, Cleveland, Coal and 28 more | 88 min |
| Sep 18, 3:59 PM CDT | Mesoscale Discussion | SPC | Love | 31 min |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Arkansas, 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.