Alert archive / Kansas / Mesoscale Discussions in 2012

Mesoscale Discussion 384

March 29, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2012, 6:58 PM CDT for 4 states. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: Mar 29, 2012, 6:58 PM CDT (23:58 UTC)
Expired: Mar 29, 2012, 8:00 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

All 25 counties

Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Jefferson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Riley County, KS, Shawnee County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Holt County, MO, Nodaway County, MO, Gage County, NE, Johnson County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE

The radar

The Topeka radar (KTWX), 122 km from the middle of the area, began a volume at 00:01 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

Topeka, KS (KTOP), launched 12:00Z, 12.0 hours before the alert went out and 112 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1633 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 545 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

003 
ACUS11 KWNS 292358
SWOMCD
SPC MCD 292358 
MOZ000-IAZ000-KSZ000-NEZ000-300100-

MESOSCALE DISCUSSION 0384
NWS STORM PREDICTION CENTER NORMAN OK
0658 PM CDT THU MAR 29 2012

AREAS AFFECTED...SERN NEB/FAR SWRN IA/FAR NWRN MO/FAR NERN KS

CONCERNING...TORNADO WATCH 115...

VALID 292358Z - 300100Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 115 CONTINUES.

WW 115 HAS BEEN EXTENDED NEWD INTO FAR SWRN IA BASED ON
COLLABORATION BETWEEN WFO OMAHA AND SPC.  

AT 2345Z...REGIONAL RADAR IMAGERY SHOWED THE STRONGEST/ORGANIZED
STORM...THUS FAR WITHIN WW 115...WAS MOVING THROUGH NRN NEMAHA/SRN
OTOE COUNTIES NEB.  GIVEN THIS TRACK ALONG THE WARM FRONT AND INVOF
THE INSTABILITY GRADIENT...THIS STORM WILL LIKELY AFFECT PART OF FAR
SWRN IA.  THIS AND FAVORABLE DEEP LAYER SHEAR WILL SUSTAIN STORM
ORGANIZATION AND POTENTIAL SEVERE WEATHER THREAT AS ACTIVITY
PROGRESSES EWD. 

A COUPLE ADDITIONAL STRONG STORMS HAVE ALSO DEVELOPED ALONG THE SERN
NEB/SWRN IA BORDER MOVING INTO IA.  THIS ACTIVITY IS LOCATED WITHIN
SLIGHTLY WEAKER INSTABILITY /MLCAPE 500-1000 J PER KG/...BUT
EFFECTIVE BULK SHEAR OF 40 KT WILL SUPPORT ORGANIZED STORMS. ESELY
SURFACE WINDS WITH DEEP LAYER WINDS VEERING WITH HEIGHT SUPPORT
ROTATING UPDRAFTS...BUT RELATIVELY WEAK WIND SPEEDS WITHIN THE
LOWEST 1 KM AGL SUGGEST THE TORNADO THREAT MAY BE LESS LIKELY THAN
WITH ACTIVITY A LITTLE FARTHER S OVER THE IMMEDIATE TRI-STATE AREA
OF SERN NEB/SWRN IA/NWRN MO.

MEANWHILE...FARTHER EWD THROUGH SRN IA...THE PRESENCE OF A MORE
STABLE AIR MASS SUGGESTS SOUTH CENTRAL IA WILL TEND TO HAVE LIMITED
SEVERE WEATHER THREAT THIS EVENING...BUT CONVECTIVE TRENDS WILL BE
MONITORED FOR ANY INCREASE IN CONVECTIVE ORGANIZATION.

..PETERS.. 03/29/2012

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

ATTN...WFO...DMX...EAX...OAX...TOP...

LAT...LON   40049688 40469686 40999594 41239583 41139487 40619490
            40539455 39539459 39549501 39429504 39339517 39059521
            39029616 39149698 40049688

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 28, 11:21 PM CDT	Mesoscale Discussion	SPC	Adams, Cass, Decatur, Fremont, Mills, Montgomery and 6 more	84 min
Mar 29, 5:10 PM CDT	Tornado Watch	SPC	Fremont, Mills, Montgomery, Page	6 hr
Mar 28, 7:53 PM CDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Bourbon, Brown, Clay and 24 more	2 hr
Mar 28, 8:17 PM CDT	Severe Thunderstorm Watch	SPC	Allen, Greenwood, Woodson	4 hr
Mar 29, 4:50 PM CDT	Mesoscale Discussion	SPC	Barber, Comanche, Dickinson, Harper, Harvey, Kingman and 6 more	55 min
Mar 29, 4:54 PM CDT	Mesoscale Discussion	SPC	Atchison, Brown, Doniphan, Jackson, Marshall, Nemaha and 2 more	36 min
Mar 29, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	Barber, Butler, Chase, Coffey, Cowley, Douglas and 13 more	8 hr
Mar 29, 11:53 AM CDT	Mesoscale Discussion	SPC	Caldwell, Carroll, Chariton, Daviess, Grundy, Howard and 5 more	97 min

Nearby

Mesoscale Discussions in Kansas, 2012 Mesoscale Discussions in Nebraska, 2012 Mesoscale Discussions in Missouri, 2012 Every 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.