Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 925
The Storm Prediction Center issued this mesoscale discussion at May 24, 2011, 12:18 PM CDT for 27 counties in Oklahoma; 13 counties in Texas. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- May 24, 2011, 12:18 PM CDT (17:18 UTC)
- Expired
- May 24, 2011, 1:45 PM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
All 40 counties
Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pottawatomie County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Haskell County, TX, Jack County, TX, Knox County, TX, Montague County, TX, Throckmorton County, TX, Wichita County, TX, Wilbarger County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 51 km from the middle of the area, began a volume at 17:24 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, 5.3 hours before the alert went out and 122 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
- 2178 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 573 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 422 m²/s²
- 0-3 km storm-relative helicity
- 490 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.9
The text
As transmitted, in the capitals the NWS used until 2016.
987
ACUS11 KWNS 241718
SWOMCD
SPC MCD 241718
OKZ000-TXZ000-241845-
MESOSCALE DISCUSSION 0925
NWS STORM PREDICTION CENTER NORMAN OK
1218 PM CDT TUE MAY 24 2011
AREAS AFFECTED...NW TX...WRN AND CNTRL OK
CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY
VALID 241718Z - 241845Z
STORM INITIATION IS EXPECTED ACROSS WRN OK AND NW TX OVER THE NEXT
HOUR. SUPERCELLS SHOULD RAPIDLY DEVELOP WITH A THREAT FOR LARGE HAIL
AND TORNADOES. A TORNADO WATCH WILL LIKELY NEED TO BE ISSUED BY 18Z.
SFC ANALYSIS SHOWS A 997 MB LOW IN THE NRN TX PANHANDLE WITH A
DRYLINE EXTENDING SWD FROM THE LOW ACROSS FAR WRN OK INTO WEST TX.
THE DRYLINE IS STARTING TO ADVANCE EWD WITH VISIBLE SATELLITE
IMAGERY SHOWING AN EXPANDING FIELD OF CUMULUS FROM I-40 IN WRN OK
SWD TO NEAR SAN ANGELO IN WCNTRL TX. AS FURTHER DESTABILIZATION
OCCURS THIS AFTERNOON AND THE CAP WEAKENS...RAPID CELL INITIATION IS
EXPECTED TO OCCUR ALONG THIS CORRIDOR. AS THIS OCCURS...A 50 TO 65
KT MID-LEVEL JET EJECTING NEWD TOWARD THE SRN PLAINS WILL CREATE
STRONG DEEP LAYER SHEAR PROFILES VERY FAVORABLE FOR SUPERCELLS. AS
STORMS INTENSIFY...VERY LARGE HAIL GREATER THAN 2 INCHES IN DIAMETER
WILL BECOME LIKELY. IN ADDITION...A 30 TO 40 KT LOW-LEVEL JET IS IN
PLACE ACROSS NW TX AND WRN OK. AS THIS FEATURE
STRENGTHENS...LOW-LEVEL SHEAR WILL BECOME VERY FAVORABLE FOR
TORNADOES. WITH 0-3 KM STORM RELATIVE HELICITIES INCREASING INTO THE
450 TO 600 M2/S2 RANGE...LONG-TRACK STRONG TORNADOES ARE EXPECTED TO
OCCUR LATE THIS AFTERNOON INTO EARLY THIS EVENING.
..BROYLES.. 05/24/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...FWD...OUN...SJT...LUB...
LAT...LON 36359864 35549906 34789972 34469989 33560003 32959970
32809942 32789855 33159793 33799761 34609702 35689660
36409722 36629823 36359864SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 7:50 PM CDT | Mesoscale Discussion | SPC | Comanche, Cotton, Jackson, Jefferson, Stephens, Tillman | 55 min |
| May 23, 9:22 PM CDT | Mesoscale Discussion | SPC | Adair, Blaine, Canadian, Cherokee, Creek, Haskell and 15 more | 23 min |
| May 23, 9:42 PM CDT | Severe Thunderstorm Watch | SPC | Blaine, Caddo, Canadian, Cleveland, Creek, Grady and 18 more | 6 hr |
| May 24, 2:08 AM CDT | Mesoscale Discussion | SPC | Cherokee, Creek, Haskell, LeFlore, McIntosh, Muskogee and 5 more | 97 min |
| May 24, 12:47 PM CDT | Tornado Watch | SPC | Alfalfa, Atoka, Blaine, Bryan, Caddo, Canadian and 51 more | 11 hr |
| May 24, 2:35 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Grant, Kay, Woods | 85 min |
| May 24, 4:48 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Carter, Cleveland, Cotton, Creek and 21 more | 87 min |
| May 24, 6:43 PM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Cleveland, Coal, Creek, Garvin and 17 more | 62 min |
| May 24, 2:15 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coke, Coleman, Comanche, Concho and 28 more | 90 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.