Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 896
The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 2:08 PM CDT for 21 counties in Oklahoma; 17 counties in Texas. It was in force for 97 min.
The area
The outline as issued.
The facts
- Issued
- May 23, 2011, 2:08 PM CDT (19:08 UTC)
- Expired
- May 23, 2011, 3:45 PM CDT
- In force
- 97 min
- Issued by
- the Storm Prediction Center
All 38 counties
Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Childress County, TX, Cottle County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Jones County, TX, King County, TX, Knox County, TX, Shackelford County, TX, Stephens County, TX, Stonewall County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 42 km from the middle of the area, began a volume at 19:11 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 12:00Z, 7.1 hours before the alert went out and 188 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
- 3480 J/kg
- Mixed-layer CIN
- -202 J/kg
- Mixed-layer LCL
- 749 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 286 m²/s²
- 0-3 km storm-relative helicity
- 240 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.6
The text
As transmitted, in the capitals the NWS used until 2016.
465
ACUS11 KWNS 231908
SWOMCD
SPC MCD 231908
OKZ000-TXZ000-232045-
MESOSCALE DISCUSSION 0896
NWS STORM PREDICTION CENTER NORMAN OK
0208 PM CDT MON MAY 23 2011
AREAS AFFECTED...WRN OK...NW TX
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 231908Z - 232045Z
A SEVERE THREAT WILL LIKELY DEVELOP ACROSS WRN OK AND NORTHWEST TX
LATE THIS AFTERNOON AS STORMS INITIATE. INITIALLY...LARGE HAIL WILL
THE GREATEST THREAT BUT A TORNADO THREAT WILL ALSO BE POSSIBLE AS
THE STORMS BECOME MORE MATURE LATE THIS AFTERNOON. WW ISSUANCE WILL
BE LIKELY ONCE INITIATION OF MULTIPLE STORMS BECOMES MORE CERTAIN.
AT THE SFC...A 1002 MB LOW IS LOCATED IN FAR NE TX PANHANDLE WITH A
DRYLINE EXTENDING SWD INTO WEST TX. EAST OF THE DRYLINE...SFC
DEWPOINTS ARE IN THE UPPER 60S AND LOWER 70S F WITH MESOANALYSIS
ESTIMATING MLCAPE VALUES FROM 3500 TO 4500 J/KG ACROSS MUCH OF WRN
OK AND NW TX. VISIBLE SATELLITE IMAGERY SHOWS SOME CUMULUS TOWERS IN
BECKHAM COUNTY OK. ATTM...THE CUMULUS FIELD IS VERY SMALL BUT IS
EXPECTED TO EXPAND OVER THE NEXT HOUR OR TWO AS LOW-LEVEL
CONVERGENCE INCREASES ALONG AND TO THE EAST OF THE DRYLINE. THIS
ALONG WITH INCREASING LARGE-SCALE ASCENT ASSOCIATED WITH A SHORTWAVE
TROUGH MOVING INTO THE SRN PLAINS FROM THE WEST SHOULD RESULT IN
VIGOROUS STORM INITIATION. AS STORMS INCREASE IN COVERAGE...THE
STRONG INSTABILITY AND DEEP LAYER SHEAR OF 40 TO 45 KT SHOULD
SUPPORT SUPERCELL DEVELOPMENT. LARGE HAIL WILL BE LIKELY AND A
TORNADO THREAT MAY ALSO DEVELOP ESPECIALLY AS THE STORMS MATURE AND
THE LOW-LEVEL JET INCREASES EARLY THIS EVENING.
..BROYLES.. 05/23/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...SJT...LUB...AMA...
LAT...LON 36979845 36779912 36279954 35390003 34620039 33710057
33040054 32720036 32449976 32399905 32869853 34159828
36279748 36979845SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 7:52 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Delaware, Haskell, McIntosh and 9 more | 53 min |
| May 22, 8:10 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Garvin and 11 more | 65 min |
| May 22, 8:47 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Choctaw, Delaware, Haskell, Latimer and 6 more | 7 hr |
| May 22, 11:46 PM CDT | Mesoscale Discussion | SPC | Haskell, Sequoyah | 89 min |
| May 23, 5:07 AM CDT | Mesoscale Discussion | SPC | Adair, Alfalfa, Blaine, Canadian, Cherokee, Cleveland and 29 more | 113 min |
| May 23, 5:41 AM CDT | Mesoscale Discussion | SPC | Craig, Nowata, Osage, Ottawa, Washington | 94 min |
| May 23, 6:08 AM CDT | Severe Thunderstorm Watch | SPC | Craig, Delaware, Mayes, Nowata, Osage, Ottawa and 3 more | 7 hr |
| May 23, 7:38 AM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Mayes, Nowata, Ottawa, Rogers and 2 more | 97 min |
| May 23, 9:14 AM CDT | Mesoscale Discussion | SPC | LeFlore, McCurtain, Pushmataha | 91 min |
| May 23, 12:12 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Delaware, Mayes, Nowata and 2 more | 93 min |
| May 23, 2:30 PM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more | 8 hr |
| May 23, 5:07 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Coal, Creek, Delaware, Garvin and 21 more | 23 min |
| May 23, 5:24 PM CDT | Tornado Watch | SPC | Adair, Cherokee, Creek, Haskell, Latimer, LeFlore and 13 more | 4 hr |
| May 23, 6:51 PM CDT | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Cleveland, Comanche, Cotton and 12 more | 84 min |
| May 22, 8:59 PM CDT | Severe Thunderstorm Watch | SPC | Bell, Bosque, Collin, Comanche, Coryell, Dallas and 28 more | 2 hr |
| May 23, 9:57 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Dallas, Delta and 30 more | 33 min |
| May 23, 9:59 AM CDT | Severe Thunderstorm Watch | SPC | Bosque, Collin, Comanche, Cooke, Dallas, Delta and 29 more | 6 hr |
| May 23, 12:10 PM CDT | Mesoscale Discussion | SPC | Anderson, Bosque, Bowie, Camp, Cass, Cherokee and 46 more | 65 min |
| May 23, 4:58 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Eastland, Shackelford, Stephens and 2 more | 62 min |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Texas, 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.