IND issues Area Forecast Discussion (AFD) at Jun 9, 6:53 PM EDT085
FXUS63 KIND 092253
AFDIND
Area Forecast Discussion
National Weather Service Indianapolis IN
653 PM EDT Sun Jun 9 2024
.KEY MESSAGES...
- Unseasonably cool Monday
- Mid-week moderation will bring highs near 90F by Thursday
- Mainly dry past low-chances of showers/t-storms Thu Night-Friday
&&
.SHORT TERM (This evening through Monday)...
Issued at 300 PM EDT Sun Jun 9 2024
The cirrus shield associated with the earlier convective cluster to
our southwest has continued to shift south into the early afternoon
as cloud tops warm and diminish overall. Diurnal cu has formed in
its place especially across the northern half of the forecast area
as the upper trough anchored across the northeast States has begun
to amplify. Temperatures are comfortable this afternoon with mid and
upper 70s common across central Indiana as of 18Z.
The aforementioned upper trough will serve as the main influence
across the region through the short term...with increasing
amplification of the trough tonight and Monday before shifting away
from the Ohio Valley Monday night. With an expanding area of high
pressure at the surface approaching from the northwest on Monday as
well...the stage is set for a brief shot of cooler air before Summer
is set to arrive in earnest later this week. Monday will not only be
the coolest day of the next 7 days...but it very likely will be the
coolest day across the region for the foreseeable future.
Gusty northwest winds will be the primary impact for the rest of the
afternoon as soundings already showing a well mixed airmass up to
about 800mb currently that is likely to mix even higher by the end
of the afternoon. Peak gusts at 25 to 30mph will continue through
the remainder of the afternoon before diminishing this evening. Cu
will persist into the early evening then dissipate near sunset.
Expect highs to peak in the upper 70s and lower 80s over the next
few hours.
Skies will be mainly clear to start this evening but a broad area of
lower stratus and stratocu dropping south currently through the
Great Lakes will advect into the region early Monday associated with
a wave aloft aiding in the mean trough amplification. Model
soundings and RH progs both supporting an expansion of lower stratus
into the northern half of the forecast area Monday morning.
The question then becomes how extensive the cloud cover will be and
how long it will hold on Monday. While cold advection will be
ongoing... broad stratus lingering for a full day in June is
difficult considering that our sun angle is at nearly peak level for
the year. Suspect that as the wave aloft shifts off to the east
Monday afternoon...will see stratus mix out into a cu field with the
greatest coverage over the northeast half of the forecast area where
cold advection will remain strongest. The lingering cu along with a
resumption of breezy winds from the north will make for a
distinctively early Fall feel to the air on Monday.
Temps...cool night expected tonight with lows falling into the 50s.
Could see a few spots make a run at the upper 40s in northern
counties but think the arrival of the stratus late will keep that
from occurring. As mentioned above...Monday is easily set up to be
the coolest day for the foreseeable future. Nudged temps down based
on the expected cloud coverage and cold advection regime with highs
in the upper 60s and lower 70s from north to south. After a chilly
Monday night...temperatures will quickly recover through the week
with heat on the horizon. More on this in the Long Term section
below.
&&
.LONG TERM (Monday night through Sunday)...
Issued at 302 PM EDT Sun Jun 9 2024
Monday Night through Wednesday...
The long term will start on the heels of what may well end up being
the coolest day of the foreseeable future Monday...as the inflection
point between the departing deep H500 trough and arriving short wave
upper ridge crosses Indiana Monday night. Seasonably strong surface
high pressure (currently over the Canadian interior Plains) will
then cross the local region during Tuesday-Tuesday night...while the
upper ridge crossing the Great Lakes breaks down ahead of
strengthening upstream retracted/zonal flow.
Mostly clear skies will include a period of scattered clouds late
Tuesday under a passing ripple in the building zonal ridge. This
subtle transition will mark the switch from below to above normal
readings amid the steadily moderating pattern. Mainly light
southwesterly breezes will bring 80s on Wednesday under H850
temperatures rising to around 15 Celsius. The western extents of
the slowly departing/weakening surface ridge will keep the CWA dry
through Wednesday night.
Thursday through Sunday...
Very warm to hot conditions will be the rule throughout the late
week and upcoming weekend as the subtropical zonal ridge attempts to
build northward over much of the CONUS. A short wave trough will
cross the Great Lakes around the Thursday night-Friday night
timeframe...which will bring at least isolated rain chances to
central Indiana, and likely slightly cooler and less humid
conditions around Friday night and Saturday. Not the greatest
confidence in the late week precipitation forecast with strong to
severe storms likely well to our northwest...which may spill at
least scattered peripheral showers across northern Indiana for maybe
6-12 hours ahead of this late-week cool frontal passage.
Otherwise mid-summer type marginal heat and moderate humidity should
prevail most days, with highs most likely 5-10 degrees above normal
and dewpoints often into the 60s. A glance into next week shows the
potential continuing for heat...as CPC Max Temp probability of 90F+
at 25-50 percent across the CWA through Day 14...with greatest
likelihood of hot conditions south/west of Indianapolis.
&&
.AVIATION (00Z TAF Issuance)...
Issued at 653 PM EDT Sun Jun 9 2024
Impacts:
- MVFR ceilings at most sites Monday morning
- Wind gusts near 20kt possible Monday afternoon
Discussion:
Cumulus will dissipate some as heating is lost this evening, and
wind gusts will diminish as well.
Another cold front will move through tonight. Winds will back
briefly before the front moves through then return to north and
northwest. Clouds will increase once again overnight with MVFR
ceilings developing at most sites Monday morning.
Clouds will gradually lift and break up Monday afternoon. Mixing
will bring some gusts as well.
&&
.IND WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
SHORT TERM...Ryan
LONG TERM...AGM
AVIATION...50
Source:
IND issues Area Forecast Discussion (AFD) at Jun 9, 6:53 PM EDT---------------
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