Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 618
The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2012, 1:37 AM CDT for 14 counties in Oklahoma. It was in force for 23 min.
The area
The outline as issued.
The facts
- Issued
- Apr 29, 2012, 1:37 AM CDT (06:37 UTC)
- Expired
- Apr 29, 2012, 2:00 AM CDT
- In force
- 23 min
- Issued by
- the Storm Prediction Center
Counties Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Grant County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK, Roger Mills County, OK
The radar
The Vance AFB radar (KVNX), 55 km from the middle of the area, began a volume at 06:37 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
Lamont, OK (KLMN), launched 00:00Z, 6.6 hours before the alert went out and 71 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
- 167 J/kg
- Mixed-layer CIN
- -203 J/kg
- Mixed-layer LCL
- 868 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
916
ACUS11 KWNS 290637
SWOMCD
SPC MCD 290637
OKZ000-KSZ000-TXZ000-290700-
MESOSCALE DISCUSSION 0618
NWS STORM PREDICTION CENTER NORMAN OK
0137 AM CDT SUN APR 29 2012
AREAS AFFECTED...PARTS OF NRN AND WRN OK
CONCERNING...SEVERE THUNDERSTORM WATCH 200...
VALID 290637Z - 290700Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 200
CONTINUES.
WHILE ISOLATED HAIL POTENTIAL CONTINUES WITH A FEW
REMAINING/ELEVATED SUPERCELLS...WW WILL BE ALLOWED TO EXPIRE AT
29/07Z.
LATEST RADAR LOOP SHOWS CONTINUED/GRADUAL DECREASE IN STORM
ORGANIZATION/INTENSITY ACROSS THE WRN AND NRN OK PORTIONS OF WW 200.
WITH AMPLE CAPE/SHEAR LINGERING ACROSS MAINLY N CENTRAL OK...A FEW
ADDITIONAL LARGE HAIL EVENTS REMAIN POSSIBLE OVER THE NEXT COUPLE OF
HOURS. HOWEVER...DECREASING/ISOLATED NATURE OF THE THREAT DOES NOT
WARRANT NEW WW ISSUANCE.
..GOSS.. 04/29/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...ICT...OUN...AMA...
LAT...LON 36979674 36109686 35629823 35149949 35270001 35940000
37079798 37139704 36979674SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 28, 10:36 PM CDT | Tornado Watch | SPC | Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 11 more | 3 hr |
| Apr 28, 10:54 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Cotton, Grady and 4 more | 2 hr |
| Apr 28, 11:52 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Cherokee, Craig, Creek, Delaware, McIntosh and 13 more | 5 hr |
| Apr 29, 1:53 AM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Creek, Delaware, Kay and 12 more | 2 hr |
| Apr 29, 3:13 AM CDT | Mesoscale Discussion | SPC | Beckham, Custer, Dewey, Roger Mills | 92 min |
| Apr 29, 2:22 PM CDT | Mesoscale Discussion | SPC | Cimarron | 113 min |
| Apr 29, 5:10 PM CDT | Severe Thunderstorm Watch | SPC | Beaver, Cimarron, Harper, Texas | 8 hr |
| Apr 29, 5:51 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Canadian, Craig, Creek, Garfield, Grant and 17 more | 2 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2012Every mesoscale discussion in 2012
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.