IND issues Area Forecast Discussion (AFD) at Aug 20, 6:13 AM EDT810
FXUS63 KIND 201013
AFDIND
Area Forecast Discussion
National Weather Service Indianapolis IN
613 AM EDT Tue Aug 20 2024
.KEY MESSAGES...
- Dry with well below normal temperatures and lower humidity through
Wednesday.
- Temperatures will return to normal and then above normal late
this week and weekend. The humidity will return as well.
&&
.SHORT TERM (Today and tonight)...
Issued at 218 AM EDT Tue Aug 20 2024
The upper air pattern will remain with northwest flow over
central Indiana today and tonight as an upper low drops from
western Quebec to upstate New York an a high amplitude ridge
extends from Hudson Bay to eastern Colorado. Meanwhile, broad
surface high pressure will remain from Hudson Bay to Arkansas.
This will provide broad subsidence and when combined with a mostly
dry column and northeast winds around the high will provide dry
and cool weather with well below normal temperatures. The only
caveats will perhaps be patches of stratocu over east central
sections, closer to the cyclonic flow, localized brief overnight
shallow fog in rural and low lying areas and scattered diurnal cu
per the cu development progs. DESI afternoon temperatures are
clustered nicely in the 70s which is some 5 to 10 degrees below
normal for this date.
Mostly clear skies are expected tonight and winds should become
light northeast to possibly calm as the pressure gradient relaxes
some. This would allow for very chilly temperatures with most
northern sections expected to drop into the middle to upper 40s.
Meanwhile, Marion county, with the urban effect, along with southern
sections may only see lows in the lower 50s.
&&
.LONG TERM (Wednesday through Monday)...
Issued at 218 AM EDT Tue Aug 20 2024
Things will change very little weatherwise through Wednesday as the
amplified pattern shifts on slightly eastward. Eventually, late week
into the weekend, a much warmer and more humid airmass will move in
as the ridge builds overhead and low level winds shift to the south
around the departing surface high, that will move to the East Coast
by Friday. That should allow temperatures to rebound to a more
Summerlike flavour with highs in the 80s and even possibly lower 90s
by Sunday and 90s by next Monday. The forecast looks mostly dry
through the weekend, will not completely rule out some convection by
late week or early next week depending on the evolution of the upper
ridge as currently there is considerable spread.
&&
.AVIATION (12Z TAF Issuance)...
Issued at 611 AM EDT Tue Aug 20 2024
Impacts:
- None
Discussion:
Surface high pressure and a mostly dry column per Hi-Res soundings
will lead to VFR flying conditions. Should only see some patches of
cu on the back side of the upper low and scattered afternoon fair
weather cu.
Winds will be from the north and northeast less than 10 knots.
&&
.IND WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
SHORT TERM...MK
LONG TERM...MK
AVIATION...MK
Source:
IND issues Area Forecast Discussion (AFD) at Aug 20, 6:13 AM EDT---------------
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