Area Forecast Discussion
Issued by NWS Northern Indiana

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609
FXUS63 KIWX 210742
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
340 AM EDT Mon Oct 21 2019

.SYNOPSIS...
Issued at 340 AM EDT Mon Oct 21 2019

A band of showers will overspread the area late morning into early
aftn followed by showers and a few thunderstorms this afternoon into
early evening along a strong cold front. In addition, strong south to
southeast winds will overspread the area with gusts to 40 mph likely
this afternoon. Highs will range from 65 to 70.

Much colder and continued windy tonight and Tuesday.

&&

.SHORT TERM...(Today through Tuesday)
Issued at 340 AM EDT Mon Oct 21 2019

Upstream expanding precip shield over MO advancing rapidly newd and
will spread into swrn areas mid morning and into nw OH by early
aftn. A period of strong/gusty winds likely to arise on backside of
this activity per intense mixing within maxmized low level jet core
late morning through mid aftn.

Thereafter some recovery likely ahead of strong sfc cold front this
aftn. Cams solutions remain adamint on low topped convection
developing along cold front w/some suggestion of a thin line event
late through nrn IN which within a very strong kinematic wind field
would pose some certain svr wind risk.

Otherwise robust low level cold advection follows overnight and
Tuesday with gusty post frontal swrly flow expected. Passage of
moist/trailing mid level trough likely to support additional showers
north by late morning through mid aftn and bumped pops a bit higher
per good consensus signals.

&&

.LONG TERM...(Wednesday through Sunday)
Issued at 340 AM EDT Mon Oct 21 2019

Perturbed/active NOAM flow continues this period. Next progressive
sw disturbance digging through highly amplified flow will spurn
additional showers Thu into Friday within over running flow atop low
level baroclinic zone through the srn lakes/wrn OH valley. Lots of
deterministic noise in this time frame yet ensemble clustering
warrants holding close to prior mid range chance pop mention.

Greater disparity seen thereafter for next weekend. Some proclivity
for lagging jet/sw distubance to break off through the srn plains
and spin up another sig cyclone that lifts out through the OH valley
as indicated by similar multi-run trends of the EC/GEM. GFS and most
ensembles contrast with a much more progessive open/weaker sys
aloft. Nevertheless will hold with some mention of pops late
Sat/early Sun attm.

&&

.AVIATION...(For the 06Z TAFS through 06Z Monday Night)
Issued at 207 AM EDT Mon Oct 21 2019

VFR conditions will deteriorate to MVFR/IFR through the period as
the occluding low pressure system over the northern plains lifts
into MN/WI/Upper Michigan. This period we deal with the initial push
of Warm air/moisture advection ahead of the occlusion, with the warm
front lifting north over the terminals through tomorrow, and the
cold front to the west impinging in rapidly behind. We`ll see rain
and maybe even a few thunderstorms during the 15-00z time frame.
Expect some improvement after 00z/3z (west to east) as the dry slot
moves in.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...NONE.
MI...NONE.
OH...NONE.
LM...Small Craft Advisory from 11 AM Monday to 11 AM EDT Tuesday for
     LMZ043-046.

     Gale Warning from 11 AM to 11 PM EDT Tuesday for LMZ043-046.

&&

$$

SYNOPSIS...T
SHORT TERM...T
LONG TERM...T
AVIATION...MCD


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