Alert archive / Kansas / Mesoscale Discussions in 2012
Mesoscale Discussion 509
The Storm Prediction Center issued this mesoscale discussion at Apr 13, 2012, 2:37 PM CDT for 15 counties in Kansas; Barton County, Missouri. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Apr 13, 2012, 2:37 PM CDT (19:37 UTC)
- Expired
- Apr 13, 2012, 4:30 PM CDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
Counties Allen County, KS, Anderson County, KS, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Coffey County, KS, Crawford County, KS, Elk County, KS, Franklin County, KS, Labette County, KS, Linn County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Woodson County, KS, Barton County, MO
The radar
The Tulsa radar (KINX), 158 km from the middle of the area, began a volume at 19:35 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, 7.6 hours before the alert went out and 157 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 602 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 525 m²/s²
- 0-3 km storm-relative helicity
- 689 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
517
ACUS11 KWNS 131938
SWOMCD
SPC MCD 131937
MOZ000-KSZ000-132130-
MESOSCALE DISCUSSION 0509
NWS STORM PREDICTION CENTER NORMAN OK
0237 PM CDT FRI APR 13 2012
AREAS AFFECTED...SERN KS THROUGH A PORTION OF EXTREME SWRN MO
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 131937Z - 132130Z
A FEW STORMS MAY DEVELOP OVER SERN KS BY 21Z. SUPERCELLS WITH
ISOLATED LARGE HAIL WILL BE THE PRIMARY THREAT...BUT AN ISOLATED
TORNADO OR TWO CANNOT BE RULED OUT...MAINLY DURING THE EARLY
EVENING.
EARLY THIS AFTERNOON A WEAK FRONTAL BOUNDARY EXTENDS FROM NERN KS
SWWD THROUGH S-CNTRL KS AND WRN OK. THE ATMOSPHERE HAS DESTABILIZED
IN MOIST WARM SECTOR WHERE DIABATIC WARMING AND LOW 60S DEWPOINTS
BENEATH STEEP LAPSE RATES HAVE CONTRIBUTED TO 1500-2000 J/KG MLCAPE.
CUMULUS IS INCREASING ALONG THE BOUNDARY AS WELL AS IN WARM SECTOR
AND LATEST OBJECTIVE ANALYSIS SHOWS ONLY A WEAK CAP REMAINING.
THEREFORE A FEW STORMS WILL LIKELY DEVELOP WITHIN THE NEXT HOUR OR
SO. LOW LEVEL SHEAR HAS DECREASED IN WAKE OF PRIMARY LLJ THAT HAS
SHIFTED NEWD INTO THE MID MS VALLEY AREA. HOWEVER...DEEP SHEAR OF
35-40 KT WILL SUPPORT SUPERCELLS CAPABLE OF MAINLY ISOLATED LARGE
HAIL. SOME THREAT FOR AN ISOLATED TORNADO OR TWO MAY INCREASE TOWARD
EVENING AS THE LLJ STRENGTHENS.
..DIAL.. 04/13/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SGF...EAX...TOP...ICT...
LAT...LON 37059501 37059604 37049694 37499635 38339583 38829520
38059466 37509430 37059501SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 7:53 PM CDT | Mesoscale Discussion | SPC | Cheyenne, Decatur, Gove, Lane, Logan, Rawlins and 6 more | 97 min |
| Apr 12, 8:38 PM CDT | Severe Thunderstorm Watch | SPC | Cheyenne, Decatur, Gove, Graham, Greeley, Lane and 9 more | 4 hr |
| Apr 12, 11:24 PM CDT | Mesoscale Discussion | SPC | Decatur, Gove, Graham, Norton, Phillips, Sheridan and 1 more | 96 min |
| Apr 13, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 19 more | 6 hr |
| Apr 13, 5:40 PM CDT | Mesoscale Discussion | SPC | Allen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 14 more | 65 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.