Alert archive / Kansas / Mesoscale Discussions in 2013

Mesoscale Discussion 421

April 9, 20136 states

The Storm Prediction Center issued this mesoscale discussion at Apr 9, 2013, 11:27 PM CDT for 6 states. It was in force for 63 min.

The area

The outline as issued.

The facts

Issued
Apr 9, 2013, 11:27 PM CDT (04:27 UTC)
Expired
Apr 10, 2013, 12:30 AM CDT
In force
63 min
Issued by
the Storm Prediction Center
All 96 counties

Fremont County, IA, Montgomery County, IA, Page County, IA, Barber County, KS, Barton County, KS, Brown County, KS, Butler County, KS, Chase County, KS, Clay County, KS, Cloud County, KS, Comanche County, KS, Cowley County, KS, Dickinson County, KS, Edwards County, KS, Ellsworth County, KS, Geary County, KS, Harper County, KS, Harvey County, KS, Jackson County, KS, Kingman County, KS, Kiowa County, KS, Lincoln County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Morris County, KS, Nemaha County, KS, Ottawa County, KS, Pawnee County, KS, Pottawatomie County, KS, Pratt County, KS, Reno County, KS, Republic County, KS, Rice County, KS, Riley County, KS, Saline County, KS, Sedgwick County, KS, Stafford County, KS, Sumner County, KS, Wabaunsee County, KS, Washington County, KS, Atchison County, MO, Cass County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Seward County, NE, Thayer County, NE, Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Montague County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Wichita radar (KICT), 35 km from the middle of the area, began a volume at 04:28 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, 4.5 hours before the alert went out and 101 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, Lamont, OK at 00:00Z on 2013-04-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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, Lamont, OK at 00:00Z on 2013-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 378 square meters per square second.1939587897Sfc1 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
541 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
378 m²/s²
0-3 km storm-relative helicity
508 m²/s²
Significant tornado parameter
0.0
Supercell composite
11.1

Open this sounding in Storm Lab

The text

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

849 
ACUS11 KWNS 100427
SWOMCD
SPC MCD 100427 
IAZ000-MOZ000-NEZ000-KSZ000-OKZ000-TXZ000-100530-

MESOSCALE DISCUSSION 0421
NWS STORM PREDICTION CENTER NORMAN OK
1127 PM CDT TUE APR 09 2013

AREAS AFFECTED...NORTHWEST TX TO SOUTHWEST IA

CONCERNING...SEVERE THUNDERSTORM WATCH 86...87...

VALID 100427Z - 100530Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
86...87...CONTINUES.

SUMMARY...THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG A CORRIDOR
FROM NWRN TX INTO SWRN IA.  REPETITIVE THUNDERSTORM CLUSTERS CAPABLE
OF PRODUCING AT LEAST MARGINALLY SEVERE HAIL COULD LINGER WELL INTO
THE LATE NIGHT HOURS.

DISCUSSION...850MB COLD FRONT IS GRADUALLY ADVANCING EWD AND
CURRENTLY EXTENDS FROM SERN NEB...SSWWD ACROSS WRN OK INTO NWRN TX. 
COINCIDENT WITH THIS FRONT...NUMEROUS THUNDERSTORM CLUSTERS HAVE
EVOLVED WITH LATE EVENING DEVELOPMENT NOW OCCURRING ACROSS NWRN TX. 
THIS ACTIVITY IS LIFTING NNEWD ALONG/AHEAD OF THE AFOREMENTIONED
850MB FRONT AND IS SUPPLIED BY MOIST/BUOYANT ELEVATED PARCELS THAT
YIELD MUCAPE ORDER OF 2000 J/KG ACROSS THE SRN PLAINS TO NEAR 1000
J/KG ACROSS SERN NEB.  HAIL IS THE MOST LIKELY THREAT WITH THESE
STORMS AND THE LARGEST SEVERE HAIL SHOULD BE LINKED TO THE MORE
UNSTABLE AIRMASS ACROSS THE SRN PLAINS.  ADDITIONALLY...REPETITIVE
THUNDERSTORMS MAY PRODUCE CONSIDERABLE ICING WHERE SFC TEMPERATURES
HAVE DROPPED BELOW FREEZING.

..DARROW.. 04/10/2013

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

ATTN...WFO...DMX...EAX...TSA...OAX...TOP...ICT...FWD...OUN...
GID...DDC...LUB...

LAT...LON   33490003 38719925 38719852 41039739 41039487 38789607
            38789647 33489742 33490003

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 9, 7:37 PM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Benton, Black Hawk, Boone and 59 more83 min
Apr 9, 8:41 PM CDTMesoscale DiscussionSPCFremont, Montgomery, Page64 min
Apr 9, 7:22 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Cloud, Comanche, Edwards and 13 more2 hr
Apr 9, 8:51 PM CDTMesoscale DiscussionSPCBarber, Barton, Butler, Chase, Comanche, Cowley and 16 more54 min
Apr 9, 9:01 PM CDTMesoscale DiscussionSPCAllen, Anderson, Bourbon, Cherokee, Crawford, Franklin and 7 more89 min
Apr 10, 5:32 AM CDTMesoscale DiscussionSPCBarber, Butler, Chase, Cowley, Dickinson, Greenwood and 13 more4 hr
Apr 10, 1:03 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 25 more117 min
Apr 10, 1:20 PM CDTTornado WatchSPCDunklin, Pemiscot10 hr
Apr 10, 1:46 PM CDTTornado WatchSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 24 more7 hr
Apr 10, 3:01 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 22 more119 min
Apr 10, 6:09 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Crawford, Dent and 29 more96 min
Apr 10, 6:52 PM CDTSevere Thunderstorm WatchSPCLincoln, Marion, Montgomery, Pike, Ralls, Warren7 hr
Apr 9, 7:28 PM CDTMesoscale DiscussionSPCCallahan, Eastland, Jack, Palo Pinto, Shackelford, Stephens and 3 more62 min
Apr 10, 4:46 PM CDTMesoscale DiscussionSPCNewton119 min

Nearby

Mesoscale Discussions in Kansas, 2013Mesoscale Discussions in Oklahoma, 2013Mesoscale Discussions in Nebraska, 2013Every mesoscale discussion in 2013

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.