IWX issues Area Forecast Discussion (AFD) at Dec 20, 12:21 PM EST348
FXUS63 KIWX 201721
AFDIWX
Area Forecast Discussion
National Weather Service Northern Indiana
1221 PM EST Fri Dec 20 2024
.KEY MESSAGES...
- Cold nights tonight through Sunday night with lows around 10
to 20.
- Becoming very mild this upcoming week with highs around 40 to
50 Tuesday thru Thursday, even milder Friday.
&&
.DISCUSSION...
Issued at 241 AM EST Fri Dec 20 2024
A mid level trof and associated surface low over far northwest
Indiana should drift southeast/south-southeast toward central
Indiana early today. Surface reports and radar images support
up to 1"/hour in the favorable upper level support region/small
deformation zone where snow showers were occurring.
Drizzle/freezing drizzle ended earlier last night and was no
longer supported with the presence of a very deep cloud
saturation layer and a high DGZ. May have to make some snowfall
adjustments on the far south part of the forecast area from
Monticello to Marion where some or most precipitation may fall
as a mix or just rain causing lower snowfall amounts. Overnight
travel impacts were limited mainly to near and north of the
Michigan border where surface temperatures were below freezing
and roads were snow covered and slippery, especially across
Berrien County. Farther south, surface temperatures were above
freezing where roads were mostly just wet. The snow & snow
mixed with rain should end by early afternoon, although a brief
and relatively weak lake effect snow event will follow.
Inversion heights will be too low to support heavy lake effect
snow. Low level winds from 020 degrees favor any lake effect
snow showers to be near or west of Laporte County.
Otherwise, temperatures next week will become very mild for
this time of year with a very dominant positive high latitude
height anomaly developing over all of the North American
interior. Highs by next Friday are likely to be near or above
50 degrees. At this time, little if any impactive travel is
expected next week.
&&
.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 1218 PM EST Fri Dec 20 2024
Snow has tapered off at SBN and will also soon be ending at FWA.
Colder air will be moving in behind the departing low, and
north-northwest gusts around 20 kts can be expected this
afternoon. Further drying and subsidence this evening will
clear extensive lingering stratocu with improvement into VFR by
late evening.
&&
.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...Small Craft Advisory until 10 AM EST Saturday for LMZ043-046.
&&
$$
DISCUSSION...Skipper
AVIATION...Cobb
Source:
IWX issues Area Forecast Discussion (AFD) at Dec 20, 12:21 PM EST---------------
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