Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 2187
The Storm Prediction Center issued this mesoscale discussion at Sep 17, 2011, 10:17 PM CDT for 34 counties in Oklahoma; 4 counties in Texas. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Sep 17, 2011, 10:17 PM CDT (03:17 UTC)
- Expired
- Sep 17, 2011, 11:45 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 38 counties
Atoka County, OK, Bryan County, OK, Carter County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Creek County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Jefferson County, OK, Johnston County, OK, Latimer County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Marshall County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Noble County, OK, Okfuskee County, OK, Oklahoma County, OK, Okmulgee County, OK, Pawnee County, OK, Payne County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Rogers County, OK, Seminole County, OK, Tulsa County, OK, Wagoner County, OK, Cooke County, TX, Grayson County, TX, Montague County, TX, Wise County, TX
The radar
The Norman radar (KTLX), 101 km from the middle of the area, began a volume at 03:19 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 nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 3.3 hours before the alert went out and 105 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
- 2097 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1371 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 234 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 7.8
The text
As transmitted, in the capitals the NWS used until 2016.
967
ACUS11 KWNS 180318
SWOMCD
SPC MCD 180317
OKZ000-TXZ000-180445-
MESOSCALE DISCUSSION 2187
NWS STORM PREDICTION CENTER NORMAN OK
1017 PM CDT SAT SEP 17 2011
AREAS AFFECTED...NW TX INTO OK
CONCERNING...SEVERE THUNDERSTORM WATCH 850...851...
VALID 180317Z - 180445Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
850...851...CONTINUES.
STORMS OVER NRN OK MERGED INTO AN MCS...AND CONTINUE TO SURGE SEWD
INTO A MUCH COOLER AND MORE STABLE AIR MASS. A SLY LOW LEVEL JET IS
HELPING TO MAINTAIN AN ELEVATED FEED OF MOISTURE...WITH STORM CORES
THE STRONGEST ON THE WRN FRINGE OF THIS CLUSTER. LARGE HAIL WILL BE
POSSIBLE WITH THE WRN CELLS.
TO THE S...ISOLATED SEVERE STORMS PERSIST NEAR THE RED RIVER. THESE
STORMS WILL HAVE BETTER ACCESS TO THE WARM SECTOR AND MAY PERSIST
FOR A COUPLE HOURS WITH A LARGE HAIL THREAT.
OVERALL...THE SEVERE THREAT IS EXPECTED TO REMAIN ISOLATED WITH
MAINLY HAIL...AND THE WATCHES WILL BE ALLOWED TO EXPIRE AT 04Z.
..JEWELL.. 09/18/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...FWD...OUN...
LAT...LON 34169562 33259663 33179773 33509809 34759760 36439757
36699597 36249523 35619475 35159504 34169562SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 2:45 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Craig, Delaware, Haskell and 14 more | 2 hr |
| Sep 18, 3:30 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 24 more | 8 hr |
| Sep 18, 3:59 PM CDT | Mesoscale Discussion | SPC | Love | 31 min |
| Sep 18, 5:41 PM CDT | Severe Thunderstorm Watch | SPC | McCurtain | 7 hr |
| Sep 18, 6:48 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Cherokee, Choctaw, Coal and 20 more | 57 min |
| Sep 18, 4:06 PM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bosque, Brown, Callahan, Coke, Coleman and 51 more | 9 hr |
| Sep 18, 6:18 PM CDT | Mesoscale Discussion | SPC | Bandera, Bexar, Blanco, Comal, Edwards, Hays and 6 more | 57 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.