ACUS11 KWNS 292110
SWOMCD
SPC MCD 292109=20
MIZ000-WIZ000-300115-

Mesoscale Discussion 0284
NWS Storm Prediction Center Norman OK
0409 PM CDT Sat Mar 29 2025

Areas affected...Northeast WI into southern upper MI and northern
lower MI

Concerning...Freezing rain=20

Valid 292109Z - 300115Z

SUMMARY...An increase in freezing rain rates is possible into the
evening.

DISCUSSION...Some increase in precipitation has been noted this
afternoon from northeast WI into northern lower MI, in advance of a low-amplitude midlevel shortwave trough moving into western WI.
Modest isentropic ascent will continue to support light to moderate precipitation in an west-east band across the region into the
evening, with some tendency for northward expansion with time.=20

The influence of a cold surface ridge over parts of Ontario/Quebec
will maintain cold surface temperatures into the evening, while
modest warm advection continues aloft. This should generally
maintain a favorable thermodynamic profile for freezing rain, though
some mixing with sleet will be possible. Ice accretion rates could
occasionally exceed 0.03 inches per hour, as noted in recent METAR
observations from Alpena (KAPN). Another wave of moderate to locally
heavy precipitation could approach western and northern parts of the
MCD area late tonight.

..Dean.. 03/29/2025

...Please see https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!7mWRfPJ_fdO8Gw2FfeKzgZayytC9mxB_Vhc5nauAW5THzqr08OZyJ-SdrR8gXSCOwVzgTIz4e= yvPwKxNVfG14Sdo9zo$ for graphic product...

ATTN...WFO...APX...MQT...GRB...

LAT...LON 45918798 45998565 45578315 44898275 44478289 44398360
44898630 44608806 44618980 44878967 45688920 45918798=20


=3D =3D =3D
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