Alert archive / Kansas / Mesoscale Discussions in 2012
Mesoscale Discussion 381
The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2012, 4:54 PM CDT for 8 counties in Kansas; 5 counties in Missouri; 6 counties in Nebraska. It was in force for 36 min.
The area
The outline as issued.
The facts
- Issued
- Mar 29, 2012, 4:54 PM CDT (21:54 UTC)
- Expired
- Mar 29, 2012, 5:30 PM CDT
- In force
- 36 min
- Issued by
- the Storm Prediction Center
Counties Atchison County, KS, Brown County, KS, Doniphan County, KS, Jackson County, KS, Marshall County, KS, Nemaha County, KS, Pottawatomie County, KS, Washington County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Holt County, MO, Nodaway County, MO, Gage County, NE, Jefferson County, NE, Johnson County, NE, Nemaha County, NE, Pawnee County, NE, Richardson County, NE
The radar
The Topeka radar (KTWX), 103 km from the middle of the area, began a volume at 21:56 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, 9.9 hours before the alert went out and 107 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
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
238
ACUS11 KWNS 292155
SWOMCD
SPC MCD 292154
MOZ000-KSZ000-NEZ000-IAZ000-292230-
MESOSCALE DISCUSSION 0381
NWS STORM PREDICTION CENTER NORMAN OK
0454 PM CDT THU MAR 29 2012
AREAS AFFECTED...NERN KS/SERN NEB AND FAR NWRN MO
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 292154Z - 292230Z
WW WILL BE NEEDED SOON AND WILL BE COORDINATED WITH AFFECTED WFOS
ACROSS NERN KS...SERN NEB AND FAR NWRN MO.
LATE AFTERNOON SURFACE ANALYSIS SHOWED AN AREA OF LOW PRESSURE OVER
SERN NEB ALONG THE KS BORDER /INVOF JEFFERSON COUNTY NEB/...WITH A
WARM FRONT EXTENDING ESEWD THROUGH THE VICINITY OF FAR SERN NEB/NERN
KS BORDER TO EAST CENTRAL MO. THE WARM FRONT RESIDES GENERALLY N OF
I-70 IN KS. A WIND SHIFT EXTENDED SSWWD FROM THE SURFACE LOW
THROUGH CENTRAL KS TO NWRN OK. STRONG SURFACE HEATING ACROSS THE
WARM SECTOR HAS RESULTED IN WEAKENING OF THE CAP THAT WAS OBSERVED
ON THE SPECIAL 20Z SOUNDING AT TOP. THUS...THE DECREASE IN SURFACE
BASED INHIBITION HAS RESULTED IN DEEPENING CU ALONG THE KS WIND
SHIFT AND ALONG THE WARM FRONT PER VISIBLE SATELLITE IMAGERY.
THE PRESENCE OF MODERATE TO STRONG INSTABILITY /MLCAPE 2000-3000 J
PER KG/ AND 30-35 KT OF EFFECTIVE SHEAR ARE SUPPORTIVE FOR ORGANIZED
STORMS. STORMS THAT FORM AND TRACK EWD ALONG THE WARM FRONT WILL
HAVE A POTENTIAL TO PRODUCE TORNADOES GIVEN EFFECTIVE SRH OF 200-300
M2/S2.
..PETERS.. 03/29/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...EAX...OAX...TOP...GID...
LAT...LON 40069745 40529712 40599572 40539477 39769459 39689476
39519517 39379566 39389652 39599725 40069745SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 28, 11:21 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Nemaha | 84 min |
| Mar 29, 4:50 PM CDT | Mesoscale Discussion | SPC | Barber, Comanche, Dickinson, Harper, Harvey, Kingman and 6 more | 55 min |
| Mar 29, 5:10 PM CDT | Tornado Watch | SPC | Atchison, Brown, Doniphan, Jackson, Jefferson, Marshall and 3 more | 6 hr |
| Mar 29, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | Barber, Butler, Chase, Coffey, Cowley, Douglas and 13 more | 8 hr |
| Mar 29, 6:58 PM CDT | Mesoscale Discussion | SPC | Atchison, Brown, Doniphan, Jackson, Jefferson, Marshall and 4 more | 62 min |
| 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, 2012Mesoscale Discussions in Nebraska, 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.