Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 910
The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 6:51 PM CDT for 18 counties in Oklahoma; Archer County, Clay County, Wichita County, Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- May 23, 2011, 6:51 PM CDT (23:51 UTC)
- Expired
- May 23, 2011, 8:15 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 21 counties
Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Jefferson County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Oklahoma County, OK, Pottawatomie County, OK, Stephens County, OK, Tillman County, OK, Archer County, TX, Clay County, TX, Wichita County, TX
The radar
The Norman radar (KTLX), 56 km from the middle of the area, began a volume at 23:51 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, 11.9 hours before the alert went out and 44 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.
688
ACUS11 KWNS 232351
SWOMCD
SPC MCD 232351
OKZ000-TXZ000-240115-
MESOSCALE DISCUSSION 0910
NWS STORM PREDICTION CENTER NORMAN OK
0651 PM CDT MON MAY 23 2011
AREAS AFFECTED...W-CNTRL AND CNTRL OK INTO NWRN TX.
CONCERNING...TORNADO WATCH 345...
VALID 232351Z - 240115Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 345 CONTINUES.
THE THREAT FOR LARGE HAIL...ISOLATED TORNADOES AND LOCALLY DAMAGING
WIND SHOULD PERSIST THROUGH ABOUT MID EVENING FROM W-CNTRL THROUGH
CNTRL OK INTO NWRN TX.
DISCRETE SUPERCELLS THAT INITIATED EARLIER ALONG DRYLINE CONTINUE
SLOWLY EWD THROUGH W-CNTRL OK INTO NWRN TX. THE ATMOSPHERE REMAINS
STRONGLY UNSTABLE WITH 3000-3500 J/KG MLCAPE. LOW LEVEL
HODOGRAPHS...WHILE NOT EXCEPTIONALLY LARGE WITH 0-1 KM STORM
RELATIVE HELICITY FROM 150-200 M2/S2...WILL FURTHER INCREASE IN SIZE
AS LLJ STRENGTHENS. THIS SUGGESTS A WINDOW REMAINS FOR ISOLATED
TORNADOES BEFORE THE BOUNDARY LAYER COOLS AND INCREASING CONVECTIVE
INHIBITION OVERWHELMS THE UPDRAFTS.
STORMS IN NWRN OK APPEAR TO BE CONSOLIDATING INTO A SMALL
CLUSTER...AND THIS ACTIVITY MIGHT EVENTUALLY EVOLVE INTO A FORWARD
PROPAGATING BOW ECHO AND CONTINUE SEWD ALONG PRE-EXISTING OUTFLOW
BOUNDARY.
..DIAL.. 05/23/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...
LAT...LON 36689752 35839681 34989681 33709810 33459881 33929915
36559834 36689752SPC 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, 2:08 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 15 more | 97 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 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.