Alert archive / Kansas / Mesoscale Discussions in 2012

Mesoscale Discussion 542

April 14, 20128 counties in Kansas; Clay County, Platte County, Missouri

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2012, 11:48 PM CDT for 8 counties in Kansas; Clay County, Platte County, Missouri. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Apr 14, 2012, 11:48 PM CDT (04:48 UTC)
Expired
Apr 15, 2012, 1:15 AM CDT
In force
87 min
Issued by
the Storm Prediction Center

Counties Coffey County, KS, Douglas County, KS, Franklin County, KS, Johnson County, KS, Leavenworth County, KS, Lyon County, KS, Osage County, KS, Wyandotte County, KS, Clay County, MO, Platte County, MO

The radar

The Topeka radar (KTWX), 79 km from the middle of the area, began a volume at 04:48 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 00:00Z, 4.8 hours before the alert went out and 40 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.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 2012-04-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1788 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2012-04-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 401 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1788 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
665 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
401 m²/s²
0-3 km storm-relative helicity
443 m²/s²
Significant tornado parameter
5.2
Supercell composite
17.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

597 
ACUS11 KWNS 150449
SWOMCD
SPC MCD 150448
MOZ000-KSZ000-150615-

MESOSCALE DISCUSSION 0542
NWS STORM PREDICTION CENTER NORMAN OK
1148 PM CDT SAT APR 14 2012

AREAS AFFECTED...PARTS OF E CNTRL KANSAS AND WEST CENTRAL MISSOURI

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 150448Z - 150615Z

GIVEN CONTINUED GRADUAL BOUNDARY LAYER COOLING...THERE STILL APPEARS
TO BE A GOOD CHANCE THAT THE LONG-LIVED SUPERCELL MIGRATING
NORTHEASTWARD ALONG THE I-35 CORRIDOR WILL WEAKEN OR DISSIPATE PRIOR
TO PROJECTED PROGRESSION THROUGH THE WESTERN AND NORTHERN KANSAS
CITY METROPOLITAN AREA BY 07-08Z.  HOWEVER...IF THIS CELL DOES NOT
SHOW SUBSTANTIVE FURTHER WEAKENING TRENDS DURING THE NEXT HOUR...A
NEW TORNADO WATCH PROBABLY WILL HAVE TO BE ISSUED.

..KERR.. 04/15/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...EAX...TOP...ICT...

LAT...LON   38299637 38969560 39399490 39409430 39189427 38839469
            38359544 38169578 38009641 38299637

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 14, 7:15 PM CDTMesoscale DiscussionSPCButler, Chase, Dickinson, Geary, Harper, Harvey and 7 more60 min
Apr 14, 10:37 PM CDTMesoscale DiscussionSPCButler, Chase, Clay, Coffey, Dickinson, Douglas and 19 more83 min
Apr 15, 1:37 AM CDTTornado WatchSPCAtchison, Brown, Butler, Chase, Chautauqua, Coffey and 26 more5 hr
Apr 15, 4:32 AM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Chautauqua, Cherokee, Coffey and 13 more88 min
Apr 15, 6:35 AM CDTMesoscale DiscussionSPCCherokee, Crawford, Labette85 min
Apr 15, 6:38 AM CDTSevere Thunderstorm WatchSPCCherokee4 hr
Apr 14, 11:28 PM CDTMesoscale DiscussionSPCPutnam92 min
Apr 15, 9:25 AM CDTMesoscale DiscussionSPCBarry, Christian, Douglas, Greene, Howell, Laclede and 7 more95 min
Apr 15, 10:51 AM CDTTornado WatchSPCBarry, Camden, Christian, Crawford, Dallas, Dent and 19 more7 hr
Apr 15, 1:38 PM CDTMesoscale DiscussionSPCChristian, Crawford, Dent, Douglas, Howell, Laclede and 9 more97 min
Apr 15, 4:22 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 23 more83 min
Apr 15, 4:42 PM CDTTornado WatchSPCAudrain, Boone, Butler, Callaway, Carter, Cole and 35 more6 hr

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.