Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 528
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2011, 11:10 PM CDT for 4 states. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2011, 11:10 PM CDT (04:10 UTC)
- Expired
- Apr 23, 2011, 1:15 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 84 counties
Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Crawford County, AR, Franklin County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Washington County, AR, Cherokee County, KS, Labette County, KS, Montgomery County, KS, Barry County, MO, Christian County, MO, Dade County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Oregon County, MO, Ozark County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Alfalfa County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Craig County, OK, Creek County, OK, Custer County, OK, Delaware County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Haskell County, OK, Hughes County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, Mayes County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Nowata County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Sequoyah County, OK, Stephens County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK, Washita County, OK
The radar
The Tulsa radar (KINX), 23 km from the middle of the area, began a volume at 04:13 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 00:00Z, 4.2 hours before the alert went out and 161 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
- 2835 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 640 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 231 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 4.7
- Supercell composite
- 18.1
The text
As transmitted, in the capitals the NWS used until 2016.
766
ACUS11 KWNS 230411
SWOMCD
SPC MCD 230410
MOZ000-ARZ000-OKZ000-KSZ000-230615-
MESOSCALE DISCUSSION 0528
NWS STORM PREDICTION CENTER NORMAN OK
1110 PM CDT FRI APR 22 2011
AREAS AFFECTED...MUCH OF OK ...SERN KS...SWRN MO...NWRN AR
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 230410Z - 230615Z
WE ARE MONITORING FOR FURTHER DEVELOPMENT BEHIND EARLIER
CONVECTION...AND AN ADDITIONAL WW COULD BE REQUIRED AT SOME POINT
FOR MUCH OF CNTRL/NRN OK. A NEW SEVERE THUNDERSTORM WATCH HAS
ALREADY BEEN ISSUED FOR NERN OK INTO SWRN MO/NWRN AR.
SEVERE STORMS PERSIST ACROSS MUCH OF SRN OK INTO SRN MO DUE TO A
PERSISTENT SWLY LOW LEVEL JET AND PRESENCE OF MODERATE INSTABILITY.
SOME CELLS ARE LEFT SPLITS...AND MAY EFFECT ADJACENT NRN COUNTIES TO
THE ONGOING BAND OF STORMS OVER SRN OK. IT IS UNCLEAR HOW FAR N ANY
SPLITS WILL GO. HOWEVER...FARTHER N INTO THE COOLER AIR...MODELS
DEVELOP CONVECTION LATER TONIGHT AS A DEFORMATION ZONE SETS UP FROM
NRN OK INTO SRN MO. WITH AMPLE SHEAR AND INSTABILITY
AVAILABLE...STORMS WILL HAVE THE POTENTIAL TO PRODUCE HAIL.
ADDITIONAL SEVERE THUNDERSTORMS WATCHES COULD BE NEEDED IF THE
THREAT BECOMES WIDESPREAD ENOUGH.
..JEWELL.. 04/23/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PAH...LSX...LZK...SGF...TSA...ICT...OUN...
LAT...LON 36569125 36139268 34979491 34269728 34349882 35029931
35739928 36359901 36739835 37499405 37689175 37669118
36569125SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:29 PM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Clay, Fulton, Greene, Izard and 7 more | 91 min |
| Apr 22, 8:09 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Madison, Washington | 96 min |
| Apr 22, 9:39 PM CDT | Mesoscale Discussion | SPC | Carroll, Crawford, Franklin, Madison, Sebastian, Washington | 66 min |
| Apr 22, 11:04 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Madison, Marion and 3 more | 7 hr |
| Apr 23, 2:33 AM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Madison, Marion, Washington | 87 min |
| Apr 23, 5:06 AM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Madison, Marion, Newton and 1 more | 24 min |
| Apr 23, 1:04 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Mississippi | 86 min |
| Apr 23, 5:02 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Crawford and 21 more | 58 min |
| Apr 23, 5:09 PM CDT | Mesoscale Discussion | SPC | Baxter, Clay, Fulton, Randolph | 2 hr |
| Apr 23, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 30 more | 6 hr |
| Apr 22, 9:20 PM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Iron, Jefferson, Madison, Mississippi and 9 more | 55 min |
| Apr 23, 1:04 AM CDT | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Crawford, Iron and 11 more | 4 hr |
| Apr 23, 3:41 AM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Madison, Mississippi, Perry, Sainte Genevieve and 3 more | 94 min |
| Apr 22, 11:35 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Carter, Cleveland, Coal, Comanche, Cotton and 19 more | 4 hr |
| Apr 23, 2:08 AM CDT | Mesoscale Discussion | SPC | Latimer, LeFlore, Pittsburg, Pushmataha | 67 min |
| Apr 23, 12:56 PM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Choctaw, Jefferson, Johnston, Love and 2 more | 64 min |
| Apr 23, 3:05 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Cotton and 11 more | 9 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Missouri, 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.