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ACUS11 KWNS 032046
SWOMCD
SPC MCD 032045
ARZ000-MOZ000-032145-

Mesoscale Discussion 0338
NWS Storm Prediction Center Norman OK
0345 PM CDT Thu May 03 2018

Areas affected...Portions of central/eastern AR

Concerning...Severe Thunderstorm Watch 71...

Valid 032045Z - 032145Z

The severe weather threat for Severe Thunderstorm Watch 71
continues.

SUMMARY...Mainly an isolated strong/gusty wind threat continues
across WW 71.

DISCUSSION...A semi-organized line of thunderstorms will continue
eastward across the remainder of WW 71 over the next several hours. Strong/gusty winds occasionally producing mainly tree damage should
continue to be the main threat with this convection. Instability
rapidly decreases with eastward extent into eastern AR as a drier
airmass is present over this region. Therefore, the overall severe
threat is expected to diminish later this afternoon/early evening as thunderstorms interact with an increasingly hostile thermodynamic
environment.

..Gleason.. 05/03/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...MEG...LZK...SHV...

LAT...LON 34039382 34839294 35159230 35469220 35799248 36459206
36449007 35449028 35139054 34109147 33899191 33789234
33779316 34039382



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ACUS11 KWNS 141327
SWOMCD
SPC MCD 141327
ILZ000-141630-

Mesoscale Discussion 0338
NWS Storm Prediction Center Norman OK
0827 AM CDT Sun Apr 14 2019

Areas affected...Portions of Western/Central Illinois

Concerning...Heavy snow

Valid 141327Z - 141630Z

SUMMARY...A few areas of heavy snow are possible along with
potential for thundersnow. Heaviest snow rates will be around 1
inch/hour and last until 10-11 AM CDT.

DISCUSSION...A mid-level shortwave, visible on moisture channel
imagery, is now lifting through Missouri into the Upper Midwest. A
band of heavier snow associated with 850-700 mb frontogenesis is now
occurring from near Quincy, IL to northeast of Peoria, IL. As
mid-level ascent continues to move into the region and 850/700 mb
cold air advection increases, profiles should become more conducive
to heavier snowfall rates, perhaps approaching 1 inch/hour in some
places. Furthermore, weak instability at cloud top -- no more than
100-200 J/kg -- noted on the 12Z ILX sounding will support
convective elements with a few instances of thundersnow. Per NLDN
data, this has already occurred in the vicinity of Peoria over the
last hour or two with the ASOS also reporting heavy snow. The band
will continue to lift to the northeast through the day and the
heaviest snow should end by 10-11 AM CDT.

..Wendt.. 04/14/2019

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...LOT...ILX...LSX...DVN...

LAT...LON 40439112 41009034 41468962 41798894 41728849 41148853
40528962 40148999 39829102 39969139 40229140 40439112



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