Alert archive / Missouri / Mesoscale Discussions in 2017
Mesoscale Discussion 556
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2017, 10:51 PM CDT for 4 states. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2017, 10:51 PM CDT (03:51 UTC)
- Expired
- Apr 25, 2017, 11:45 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 35 counties
Benton County, AR, Boone County, AR, Carroll County, AR, Madison County, AR, Washington County, AR, Cherokee County, KS, Crawford County, KS, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Camden County, MO, Cedar County, MO, Christian County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Henry County, MO, Hickory County, MO, Jasper County, MO, Laclede County, MO, Lawrence County, MO, McDonald County, MO, Morgan County, MO, Newton County, MO, Polk County, MO, St. Clair County, MO, Stone County, MO, Taney County, MO, Vernon County, MO, Webster County, MO, Craig County, OK, Delaware County, OK, Mayes County, OK, Ottawa County, OK
The radar
The Springfield radar (KSGF), 47 km from the middle of the area, began a volume at 03:52 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
Springfield, MO (KSGF), launched 00:00Z, 3.9 hours before the alert went out and 58 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
- 446 J/kg
- Mixed-layer CIN
- -158 J/kg
- Mixed-layer LCL
- 1525 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 196 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted.
067
ACUS11 KWNS 260351
SWOMCD
SPC MCD 260351
MOZ000-ARZ000-OKZ000-KSZ000-260445-
Mesoscale Discussion 0556
NWS Storm Prediction Center Norman OK
1051 PM CDT Tue Apr 25 2017
Areas affected...Portions of western Missouri...far southeastern
Kansas...far northeastern Oklahoma...and far northwestern Arkansas
Concerning...Severe Thunderstorm Watch 159...
Valid 260351Z - 260445Z
The severe weather threat for Severe Thunderstorm Watch 159
continues.
SUMMARY...Strong to occasionally severe storms may persist eastward
beyond Watch 159. Areal expansion or new watch issuance may be
needed.
DISCUSSION...A pair of small linear segments has evolved from
eastern Kansas into far western Missouri this evening, aided by
broad large-scale ascent on the eastern fringe of a mid-level
trough. While diurnal cooling has reduced surface-based buoyancy
some, surface temperatures in the upper 60s/lower 70s and modest
low-level moisture are maintaining MLCAPE values around 500-1000
J/kg. Combined with ample south/southwesterly mid-level flow of
50-60 kt, this thermodynamic environment may support a continued
damaging wind threat beyond the eastern edge of the ongoing watch.
As such, areal expansion or new watch issuance could be needed
within the next 30 minutes or so.
..Picca.. 04/26/2017
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LZK...SGF...EAX...TSA...ICT...
LAT...LON 38359462 38529421 38529311 38399262 37989251 37209262
36349287 35919351 35989441 36239530 36909523 37699492
38359462SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 11:27 PM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll, Crawford, Franklin, Madison, Sebastian and 1 more | 7 hr |
| Apr 26, 1:42 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Crawford, Franklin, Johnson and 10 more | 2 hr |
| Apr 26, 5:37 AM CDT | Mesoscale Discussion | SPC | Conway, Crawford, Franklin, Garland, Howard, Johnson and 14 more | 113 min |
| Apr 26, 6:00 AM CDT | Severe Thunderstorm Watch | SPC | Baxter, Boone, Carroll, Conway, Crawford, Franklin and 23 more | 7 hr |
| Apr 26, 7:29 AM CDT | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Conway, Crawford, Franklin and 23 more | 2 hr |
| Apr 26, 9:39 AM CDT | Mesoscale Discussion | SPC | Arkansas, Baxter, Bradley, Calhoun, Clark, Clay and 47 more | 36 min |
| Apr 26, 10:08 AM CDT | Tornado Watch | SPC | Arkansas, Baxter, Bradley, Calhoun, Clark, Clay and 51 more | 7 hr |
| Apr 26, 1:05 PM CDT | Mesoscale Discussion | SPC | Clark, Columbia, Dallas, Grant, Hempstead, Hot Spring and 9 more | 85 min |
| Apr 26, 3:53 PM CDT | Mesoscale Discussion | SPC | Clay | 97 min |
| Apr 26, 4:23 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 19 more | 67 min |
| Apr 26, 4:44 PM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 11 more | 5 hr |
| Apr 26, 5:02 PM CDT | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 6 hr |
| Apr 26, 6:10 PM CDT | Mesoscale Discussion | SPC | Mississippi | 95 min |
| Apr 25, 7:14 PM CDT | Mesoscale Discussion | SPC | Allen, Bourbon, Chautauqua, Cherokee, Crawford, Elk and 5 more | 91 min |
| Apr 26, 12:26 PM CDT | Mesoscale Discussion | SPC | Bollinger, Butler, Cape Girardeau, Carter, Madison, Mississippi and 6 more | 94 min |
| Apr 26, 12:46 PM CDT | Severe Thunderstorm Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Madison, Perry and 6 more | 6 hr |
| Apr 25, 10:30 PM CDT | Mesoscale Discussion | SPC | Cherokee, Cleveland, Craig, Creek, Delaware, Garvin and 17 more | 90 min |
Nearby
Mesoscale Discussions in Missouri, 2017Mesoscale Discussions in Arkansas, 2017Mesoscale Discussions in Oklahoma, 2017Every mesoscale discussion in 2017
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.