Alert archive / Kansas / Mesoscale Discussions in 2012
Mesoscale Discussion 733
The Storm Prediction Center issued this mesoscale discussion at May 6, 2012, 2:40 PM CDT for 27 counties in Kansas; Platte County, Missouri. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- May 6, 2012, 2:40 PM CDT (19:40 UTC)
- Expired
- May 6, 2012, 4:15 PM CDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 60%
All 28 counties
Allen County, KS, Anderson County, KS, Butler County, KS, Chase County, KS, Coffey County, KS, Cowley County, KS, Douglas County, KS, Elk County, KS, Franklin County, KS, Greenwood County, KS, Harvey County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Lyon County, KS, Marion County, KS, Miami County, KS, Morris County, KS, Osage County, KS, Sedgwick County, KS, Shawnee County, KS, Sumner County, KS, Wabaunsee County, KS, Wilson County, KS, Woodson County, KS, Wyandotte County, KS, Platte County, MO
The radar
The Topeka radar (KTWX), 95 km from the middle of the area, began a volume at 19:42 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
Topeka, KS (KTOP), launched 12:00Z, 7.7 hours before the alert went out and 116 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
- 1880 J/kg
- Mixed-layer CIN
- -240 J/kg
- Mixed-layer LCL
- 732 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 286 m²/s²
- 0-3 km storm-relative helicity
- 218 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
661
ACUS11 KWNS 061940
SWOMCD
SPC MCD 061940
MOZ000-KSZ000-062115-
MESOSCALE DISCUSSION 0733
NWS STORM PREDICTION CENTER NORMAN OK
0240 PM CDT SUN MAY 06 2012
AREAS AFFECTED...SRN THROUGH NERN KS
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 061940Z - 062115Z
PROBABILITY OF WATCH ISSUANCE...60 PERCENT
SUMMARY...ISOLATED SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP
ALONG SLOW MOVING COLD FRONT ACROSS KS OVER THE NEXT FEW HOURS. WW
IS BEING CONSIDERED FOR THIS REGION.
DISCUSSION...DESPITE THE CONSIDERABLE HIGH CLOUDS NOTED ACROSS KS
INHIBITION IS GRADUALLY WEAKENING ALONG SFC FRONT THAT STRETCHES
FROM NEAR STJ TO ICT. TEMPERATURES HAVE WARMED INTO THE LOWER 80S
AND CONVECTION IS GRADUALLY DEEPENING ALONG THE FRONTAL ZONE.
FORECAST SOUNDINGS SUGGEST THIS IS SUFFICIENT FOR TSTM
DEVELOPMENT...ESPECIALLY GIVEN THE CONVERGENCE NOTED ALONG THE SLOW
MOVING BOUNDARY. LATEST THINKING IS ISOLATED STORMS WILL EVOLVE
OVER THE NEXT FEW HOURS WITHIN FAIRLY UNSTABLE AIRMASS THEN SPREAD
EWD ACROSS MUCH OF ERN KS INTO WRN MO. WITH STRONGER SHEAR TRAILING
THE WIND SHIFT IT APPEARS LARGE HAIL AND STRONG WINDS WILL BE THE
PRIMARY SEVERE THREATS.
..DARROW/MEAD.. 05/06/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SGF...EAX...TOP...ICT...
LAT...LON 37269832 38609694 39119609 39599445 38159435 37099644
37269832SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Atchison, Butler, Chase, Coffey and 17 more | 7 hr |
| May 6, 4:55 AM CDT | Mesoscale Discussion | SPC | Atchison, Nodaway, Worth | 2 hr |
| May 6, 9:29 AM CDT | Severe Thunderstorm Watch | SPC | Clark, Scotland | 4 hr |
| May 6, 1:22 PM CDT | Mesoscale Discussion | SPC | Audrain, Benton, Boone, Callaway, Chariton, Cooper and 13 more | 53 min |
| May 6, 1:42 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Audrain, Boone, Caldwell, Carroll, Chariton and 25 more | 7 hr |
| May 6, 3:56 PM CDT | Mesoscale Discussion | SPC | Adair, Audrain, Boone, Caldwell, Carroll, Chariton and 25 more | 64 min |
Nearby
Mesoscale Discussions in Kansas, 2012Mesoscale Discussions in Missouri, 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.