Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 233
The Storm Prediction Center issued this mesoscale discussion at Mar 7, 2012, 7:36 PM CST for 5 counties in Kansas; 28 counties in Oklahoma; Hemphill County, Wheeler County, Texas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Mar 7, 2012, 7:36 PM CST (01:36 UTC)
- Expired
- Mar 7, 2012, 9:00 PM CST
- In force
- 84 min
- Issued by
- the Storm Prediction Center
All 35 counties
Chautauqua County, KS, Cowley County, KS, Elk County, KS, Harper County, KS, Sumner County, KS, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Noble County, OK, Nowata County, OK, Oklahoma County, OK, Osage County, OK, Pawnee County, OK, Payne County, OK, Roger Mills County, OK, Washington County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Hemphill County, TX, Wheeler County, TX
The radar
The Vance AFB radar (KVNX), 47 km from the middle of the area, began a volume at 01:40 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, 1.6 hours before the alert went out and 80 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
- 645 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 1207 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 134 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
997
ACUS11 KWNS 080136
SWOMCD
SPC MCD 080136
OKZ000-KSZ000-TXZ000-080300-
MESOSCALE DISCUSSION 0233
NWS STORM PREDICTION CENTER NORMAN OK
0736 PM CST WED MAR 07 2012
AREAS AFFECTED...SRN KS...WRN/NRN OK...FAR ERN TX PANHANDLE
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 080136Z - 080300Z
SCATTERED THUNDERSTORM DEVELOPMENT IS EXPECTED TO OCCUR FROM THE ERN
TX PANHANDLE NEWD INTO NRN OK AND SRN KS TONIGHT. A FEW STORMS MAY
PRODUCE LARGE HAIL...BUT THE THREAT IS EXPECTED TO BE TOO MARGINAL
FOR A WW.
AT 01Z...SUBJECTIVE SURFACE ANALYSIS SHOWS A COLD FRONT LOCATED FROM
MKC SWWD TOWARD AVK IN NRN OK TO AMA IN THE TX PANHANDLE. THIS FRONT
WILL CONTINUE TO ADVANCE SWD ACROSS THE SRN PLAINS DURING THE NIGHT
AS A NRN STREAM TROUGH MOVES FROM THE GREAT PLAINS TOWARD THE GREAT
LAKES REGION. MEANWHILE...AREA VWP/S AND PROFILERS INDICATE SLY FLOW
AT 1 KM AGL IS ACCELERATING OVER TX AND OK...WHICH WILL AID IN
MOISTENING/DESTABILIZATION ABOVE THE COLD/STABLE NEAR SURFACE
AIRMASS ALONG/BEHIND THE FRONT. IN ADDITION...OBSERVED 00Z RAOBS
SHOW THE PRESENCE OF STEEP MIDLEVEL LAPSE RATES OVER THE CNTRL/SRN
PLAINS...WHICH IS LEADING TO MUCAPE VALUES ROOTED AT 850 MB RANGING
FROM 500-1000 J/KG. COMBINATION OF FRONTAL CIRCULATION AS WELL AS
INCREASING CONVERGENCE AND DESTABILIZATION WITHIN THE EXIT REGION OF
THE 30-45 KT LLJ WILL SUPPORT SCATTERED /MAINLY ELEVATED/
THUNDERSTORM DEVELOPMENT ALONG AND TO THE COOL SIDE OF THE FRONT
TONIGHT. GIVEN THE PRESENCE OF STEEP MIDLEVEL LAPSE RATES AND
EFFECTIVE BULK SHEAR VALUES AOA 40 KT...SOME RISK FOR LARGE HAIL
WILL EXIST. HOWEVER...MARGINAL BUOYANCY SHOULD LIMIT THE OVERALL SVR
WEATHER THREAT...AND PRECLUDE THE NEED FOR A WW.
..GARNER.. 03/08/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...ICT...OUN...DDC...AMA...
LAT...LON 36589987 37619736 37669614 36789558 35579728 34549968
35450065 36589987SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 8, 10:19 AM CST | Mesoscale Discussion | SPC | Bryan, Choctaw, McCurtain, Pushmataha | 56 min |
| Mar 8, 2:54 PM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Cotton and 14 more | 66 min |
| Mar 8, 2:28 PM CST | Mesoscale Discussion | SPC | Anderson, Bowie, Camp, Cass, Cherokee, Falls and 18 more | 62 min |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Kansas, 2012Mesoscale Discussions in Texas, 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.