Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 173
The Storm Prediction Center issued this mesoscale discussion at Feb 28, 2012, 9:47 PM CST for 15 counties in Kansas; 15 counties in Missouri; 24 counties in Oklahoma. It was in force for 58 min.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2012, 9:47 PM CST (03:47 UTC)
- Expired
- Feb 28, 2012, 10:45 PM CST
- In force
- 58 min
- Issued by
- the Storm Prediction Center
All 54 counties
Allen County, KS, Anderson County, KS, Bourbon County, KS, Cherokee County, KS, Crawford County, KS, Franklin County, KS, Johnson County, KS, Labette County, KS, Leavenworth County, KS, Linn County, KS, Miami County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Wyandotte County, KS, Bates County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Cass County, MO, Clay County, MO, Clinton County, MO, Daviess County, MO, DeKalb County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Platte County, MO, Ray County, MO, Vernon County, MO, Cleveland County, OK, Craig County, OK, Creek County, OK, Garvin County, OK, Hughes County, OK, Lincoln County, OK, Mayes County, OK, McClain County, OK, Murray County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 101 km from the middle of the area, began a volume at 03:50 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
Lamont, OK (KLMN), launched 00:00Z, 3.8 hours before the alert went out and 157 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
- 386 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 660 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 369 m²/s²
- 0-3 km storm-relative helicity
- 461 m²/s²
- Significant tornado parameter
- 0.8
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
547
ACUS11 KWNS 290348
SWOMCD
SPC MCD 290347
MOZ000-OKZ000-KSZ000-290445-
MESOSCALE DISCUSSION 0173
NWS STORM PREDICTION CENTER NORMAN OK
0947 PM CST TUE FEB 28 2012
AREAS AFFECTED...ERN KS...WRN MO...CNTRL/ERN OK
CONCERNING...TORNADO WATCH 41...
VALID 290347Z - 290445Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 41 CONTINUES.
PRIMARILY A DAMAGING WIND THREAT PERSISTS WITH QLCS EXTENDING FROM
ERN KS INTO N-CNTRL OK...WITH A HISTORY OF MEASURED SEVERE WIND
GUSTS ACROSS S-CNTRL KS/N-CNTRL OK. A MORE ISOLATED DAMAGING WIND
RISK AND PERHAPS A BRIEF TORNADO MAY DEVELOP INTO PORTIONS OF WRN MO
ALONG THE NRN PORTION OF THE LINE...AND SWWD OF THE LINE ACROSS
CNTRL OK. AREAS DOWNSTREAM OF WW 41 ARE BEING MONITORED FOR POSSIBLE
WW ISSUANCE OR LOCAL WFO EXTENSIONS.
NRN PORTION OF QLCS HAS ESSENTIALLY OVERTAKEN AND PINCHED OFF THE
RICHER WARM SECTOR...WITH SURFACE DEW POINTS AOA THE UPPER 50S
REMAINING RELEGATED FROM SERN KS ON SWD. DESPITE THE PRESENCE OF
60-70 KT SWLYS AROUND 1 KM AGL PER AREA VWP AND PROFILER DATA...A
MEAGERLY BUOYANT DOWNSTREAM AIR MASS ACROSS MOST OF W-CNTRL/NWRN MO
SHOULD MITIGATE POTENTIAL FOR DAMAGING WINDS/TORNADOES BEYOND A
LOCALIZED/BRIEF THREAT.
FARTHER SW ACROSS SERN KS INTO NERN OK...A BROADER WARM SECTOR AND
STRONGER SURFACE PRESSURE RISE/FALL COUPLET WILL REMAIN CONDUCIVE TO
SCATTERED SEVERE WIND GUSTS AND POTENTIALLY A TORNADO OR TWO.
ADDITIONAL CU/SMALL CB DEVELOPMENT IS APPARENT DOWN TO THE RED
RIVER. ALTHOUGH REMOVED FROM THE LARGER INFLUENCE OF THE CNTRL
PLAINS SHORT WAVE TROUGH...70-80 KT EFFECTIVE SHEAR WOULD SUPPORT A
RISK FOR DAMAGING WINDS/BRIEF TORNADOES SHOULD TSTM DEVELOPMENT
BECOME SUSTAINED.
..GRAMS.. 02/29/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SGF...EAX...TSA...TOP...ICT...OUN...
LAT...LON 34479827 35019777 36609676 37329603 39229506 39929476
40149401 39549343 38709366 37359445 34849618 34289681
34479827SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 7:57 PM CST | Mesoscale Discussion | SPC | Butler, Chase, Chautauqua, Cowley, Elk, Greenwood and 9 more | 48 min |
| Feb 28, 7:59 PM CST | Mesoscale Discussion | SPC | Clay, Cloud, Jewell, Mitchell, Osborne, Ottawa and 5 more | 31 min |
| Feb 28, 8:10 PM CST | Tornado Watch | SPC | Allen, Anderson, Brown, Butler, Chase, Chautauqua and 25 more | 5 hr |
| Feb 28, 10:07 PM CST | Severe Thunderstorm Watch | SPC | Johnson, Linn, Miami, Wyandotte | 3 hr |
| Feb 28, 10:30 PM CST | Tornado Watch | SPC | Bourbon, Cherokee, Crawford | 6 hr |
| Feb 28, 8:23 PM CST | Mesoscale Discussion | SPC | Atchison, Holt, Nodaway | 37 min |
| Feb 28, 11:40 PM CST | Mesoscale Discussion | SPC | Barry, Camden, Cedar, Christian, Dade, Dallas and 13 more | 95 min |
| Feb 29, 12:49 AM CST | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Franklin and 19 more | 56 min |
| Feb 29, 1:14 AM CST | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Crawford, Franklin and 19 more | 11 hr |
| Feb 29, 3:20 AM CST | Tornado Watch | SPC | Dunklin, Pemiscot | 9 hr |
| Feb 29, 3:53 AM CST | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Dunklin, Madison and 9 more | 97 min |
| Feb 29, 8:07 AM CST | Mesoscale Discussion | SPC | Dunklin, Mississippi, New Madrid, Pemiscot | 53 min |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Kansas, 2012Mesoscale Discussions in Missouri, 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.