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You can certainly feel a chill in the air over Central Indiana… and this is just an appetizer to the coldest air since mid-April that hits Halloween evening.  The viewing area is split in half this afternoon by a layer of overcast.  Up north it’s gray and in the 40s.  South of I-70 it’s significantly brighter and near 60.

NOW PLANNER EVENING

Tonight and Thursday:  Cloud cover will vary this evening and even the overcast may break by 8pm.  Temperatures will drop into the mid 30s for lows tonight and we’ll similar conditions Thursday… though I believe the overcast eventually becomes more widespread.  By late day tomorrow sprinkles and spotty showers are possible.

PLANNER THURSDAY RPM RPM 2

Halloween:  Rain chances ramp up by midday Friday as an upper level storm system dives southward into the region.  The passage of this feature creates a dramatic wind shift to the north that will keep temperatures in the 40s for Halloween day.  Wind increases from the north later in the day and the atmosphere will be cold enough to support snow showers and flurries by 5-6pm.

RPM 3 RPM 4 RPM WINDCHILL

Temperatures drop into the 30s toward sunset and wind chills plummet into the 20s as wind gusts range between 30-40mph.  Confidence is high on the temperature and wind portion of the Halloween forecast, with medium confidence on wintry precipitation developing for some.

HALLOWEEN HALLOWEEN WINDCHILL

We’ve certainly had colder and wetter Halloweens in Indianapolis.  But this will become only the 6th Halloween since 1960, and 28th since 1871, to exhibit a high below 50 degrees in the city.

HALLOWEEN FACTS

Weekend:  Due to the slower departure of this system, and its intensity, we’ve upped the wind speeds for Saturday morning.  A steady brisk northerly wind of 15 to 20mph will have a big impact on the Monumental Marathon.  Start time temperatures will be in the upper 20s and expect Saturday morning wind chills in the 15 to 20 degree range.  Not ideal running conditions.

LOWS SATURDAY MARATHON JET STREAM

The pressure gradient between a Canadian high to our northwest and a developing coastal low put Indiana in the crosshairs of a “wind sandwich.”  This keeps the funnel to unseasonably cold air open all weekend long and puts highs in the lower 40s Saturday afternoon.

SATURDAY SET UP SATURDAY SET UP 2 HIGHS SATURDAY

A calming wind and clear sky set the stage for a hard freeze and frosty start Sunday morning when lows drop into the lower/mid 20s.  Morning sun gives way to increasing clouds Sunday afternoon as highs struggle to hit 50 degrees.  Don’t forget to set your clocks back one hour before you go to bed Saturday night.

7DAY

Temperatures rebound Monday but rain quickly returns to the Ohio Valley Tuesday.  We need to monitor Thursday/Friday of next week for another potential shot of colder than normal air.  Have a great evening – Sean Ash

 

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Oct
28

Chilly Halloween Will Look And Feel More Like Thanksgiving

Posted By · October 28, 2014 at 3:46 pm

Good Tuesday afternoon.  The band of rain is out of the state and a slow clearing/thinning to the clouds continues from west to east.  While upper 50s and lower 60s are near normal, temperatures are some 20 degrees colder than this time Monday afternoon.

TEMPS 24HR CHANGE RPM TONIGHT RPM MORNING

Tonight and Wednesday:  Our weather settles down for a few days with seasonably cool conditions expected tonight into Friday morning.  Lows tonight will be much colder than this morning, with out the door temperatures Wednesday morning in the mid to upper 30s.  Highs tomorrow only warming into the middle 50s.

RPM WEDNESDAY PLANNER WEDNESDAY HIGHS THURSDAY

Thursday remains seasonably cool in the 50s and there is a chance of spotty showers late in the day in advance of a stronger system Friday.

RPM 2 RPM 3

Halloween:  Computer models remain bullish on sharply colder air diving into Central Indiana Halloween.  This will be accompanied by overcast, highs in the mid-40s, gusty wind and rain showers that mix with or change to snow showers by 8-9pm when temperatures drop into the 30s.  With or without frozen precipitation, it just doesn’t look pleasant for trick-or-treating Friday evening with wind chills likely in the 20s.

RPM 4 HALLOWEEN HIGHS RPM 5 HALLOWEEN

The coldest temperatures since mid-April arrive this weekend with lows in the 20s both Saturday and Sunday mornings… though wind and lingering cloud cover may keep lows closer to 30 Saturday morning.  Depending on the departure time of this upcoming upper level storm, wind may be a factor for the Indy Monumental Marathon.  We’ll fine tune wind speeds in the days ahead.

MARATHON 7DAY

Don’t forget we go back to Standard Time this Sunday at 2am when we “fall back” an hour.  Enjoy the extra hour of sleep!  Have a nice evening – Sean Ash

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Oct
27

Closer To A Record Than Average High Today With Big Chill Late Week

Posted By · October 27, 2014 at 1:18 pm

We’re enjoying another day of above normal warmth in Central Indiana with expected highs to be 15-20 degrees higher than average.  This equates to upper 70s and lower 80s in spots.  Temperatures at 1pm are already near 80 degrees in some locations.  Indianapolis will be closer to the record (83) than normal (61) this afternoon.

BROWN COUNTY TEMPS 24HR CHANGE HIGHS TODAY

This Afternoon and Tonight:  The only trade-off with the warmth will be a gusty southwest wind up to 25-30mph.  Hazy sun fills the sky along with occasional mid to high level clouds.  We’ll be rain-free until after midnight but the arrival time before 8am Tuesday leads to a damp commute for some tomorrow.

 PLANNER TODAY  RPM RPM 2

Tomorrow:  The first part of Tuesday looks cloudy, damp and some thunder is possible.  You’ll still feel a mild breeze in the morning with out the door temperatures in the mid-60s.  Temperatures tomorrow won’t move much due to the early day rain and passage of a cold front.  We should finish the day with some sunshine and steady temperatures in the lower to mid 60s.

RPM 3 RPM 4 RPM 5 PLANNER TUESDAY JET STREAM

Wednesday and Thursday feature seasonably cool temperatures but we’re still on board for a shot of colder than normal air to arrive Halloween evening and into this weekend.  Though there is some uncertainty on the depth of the cold air and associated jet stream trough, confidence is growing on a hard freeze Saturday and Sunday morning.

JET STREAM 2

Halloween:  Highs Friday will be near 50 with a decent amount of cloud cover and a slight shower chance.  Temperatures drop to 40 degrees Friday evening around sunset but a stiff breeze makes it feel like the 30s.  We’ve certainly had colder and wetter Halloweens, but Friday will be significantly colder than the warmth we’re experiencing currently.

HALLOWEEN FORECAST

The Weekend:  We’re on target for the first round of 20s since the middle of April.  Thankfully the cold Saturday morning doesn’t come with much wind which many running in the Monumental Marathon will be pleased to hear.  Start time temperatures will be near 30 degrees and hover in the 30s until around midday.  Sunday becomes blustery and clouds increase in advance of the next rain-maker to arrive a week from today.

MONUMENTAL FORECAST 7DAY

We’ll fine tune the weekend outlook in the days ahead.  Enjoy the summer-like afternoon – Sean Ash

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Oct
26

Warm Start To The Week But Followed By A Cold Finish

Posted By · October 26, 2014 at 5:49 pm

What a weekend!  Mid-70s Saturday and near 70 this afternoon is truly a weather treat for late October.  We’re not done with the unseasonably warm air either and Monday will be the peak of the heat.

PLANNER EVENING RPM

Tonight:  Expect clear, comfortable conditions this evening with temperatures slowly dropping into the 50s before midnight.  Morning lows will be near 50 and the warm up tomorrow won’t take long due to a strengthening southwest wind.

PLANNER MONDAY

Monday:  Upper 60s are likely during the lunch hour and highs will range from 75 to near 80 degrees… 15 to almost 20 degrees warmer than normal.

RPM 2 RPM 3

Rain and storms increase after midnight tomorrow and lead to a wet commute Tuesday morning.  Latest indications suggest the moisture axis moves east of the state by late Tuesday afternoon.  Clouds and the rain keep temperatures much cooler in the mid 60s.

RPM 4 RPM 5 RPM 6 PLANNER TUESDAY HALLOWEEN 850

Seasonably cool days are expected Wednesday and Thursday, but we’re still targeting Halloween and especially next weekend for a shot of colder than normal air.  Halloween highs will be in the lower 50s with more clouds than sun and chance for a few showers.

HALLOWEEN FORECAST

The first 20s of the season are very possible next weekend and highs will be near 50 Saturday and low to mid 50s Sunday.  Cold weather running gear will be needed Saturday morning for those participating in the Indy Monumental Marathon.  Start time temperatures will be near 30 degrees and a light wind will make it feel more like the 20s.  Despite sunshine midday temperatures will struggle into the lower 40s.  We’ll be tweaking the conditions as the week progresses.

MONUMENTAL FORECAST

7DAY

Have a great evening – Sean Ash

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Oct
24

What A Weekend With Highs Nearing 70!

Posted By · October 24, 2014 at 4:49 pm

TGIF!  What a way start to the weekend.  Clouds eventually thinned as expected to allow for hazy sunshine and a rapid rise into the mid-60 to finish Friday.

SATRAD OPERATION FOOTBALL

We’re in store for a pleasant evening of Operation Football Sectionals with a southwest wind keeping kick off temperatures near 60.

Take a light jacket with 50s expected by the 4th quarter but lows tonight shouldn’t drop much below the upper 40s due to an increase in cloud cover after midnight.  Much like Friday… sprinkles and passing showers are possible after midnight and into the morning hours of Saturday.

RPM RPM 2 RPM 3 RPM 4

Much like Friday… sprinkles and passing showers are possible after midnight and into the morning hours of Saturday.

PLANNER MORNING RPM 5 HIGHS SATURDAY

Any precipitation and residual cloud cover should diminish in the afternoon and highs make a charge at 70 degrees (and higher) for the first time since October 13th.  Temperature anomalies this weekend will be nearly 10 degrees above normal.

PLANNER AFTERNOON HIGHS SUNDAY RPM 6 PLANNER SUNDAY

Sunshine blankets the Ohio Valley Sunday in a picturesque day that will see highs of 65 to near 70 with a light wind.  The peak of this heat streak occurs Monday when highs climb into the mid and upper 70s!

HIGHS MONDAY RPM 7 RPM 8

We’re still on target for a decent chance of rain and storms Tuesday as a cold front delivers more seasonal air to Central Indiana.  Long range guidance today continues to hint a surge of colder than normal air during Halloween and into next weekend.  Highs next Friday may struggle to hit 50 degrees and lows next weekend may drop into the 20s for the first time this season.  Have a great weekend – Sean Ash

HALLOWEEN JET STREAM 7DAY

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Oct
23

Clouds Playing Role Of Spoiler For Partial Solar Eclipse Viewing

Posted By · October 23, 2014 at 4:29 pm

As anticipated clouds continue to increase and thicken over central Indiana and unfortunately will cause limited viewing of the partial solar eclipse this evening.  The towercam image below is not what the doctor ordered for the eclipse that begins at 5:42pm.

SKYCAM TEMPS NOW SATRAD

It’s possible some may catch a glimpse in any cloud breaks that may be around or just prior to the sun setting at 6:55pm.  Good luck if you’re outside this evening and please send any pictures to pix@wthr.com.

ECLIPSE PLANNER EVENING

Clouds serve as a blanket overnight and keeps temperatures much warmer tonight.  Many areas that dropped to freezing Thursday morning will likely be 10 to 15 degrees warmer Friday morning.  So expect low to mid 40s out the door tomorrow with the possibility of spotty sprinkles or light showers.

LOWS TONIGHT PLANNER FRIDAY RPM RPM 2 RPM 3

Though not as bright early Friday, temperatures will be milder in the lower to mid 60s… and we’re just scratching the surface of the advertised weekend warm up .  It’s looking like fairly pleasant playing conditions for Operation Football Friday evening with kick off temperatures near 60 degrees.

HIGHS FRIDAY OPERATION FOOTBALL HIGHS SATURDAY

 A period of clouds and/or sprinkles may accompany the surge of warmth Saturday morning.

RPM 4 RPM 5

But under hazy sun and a steady southwest wind highs climb into the 70s Saturday afternoon!  Sunday will be slightly cooler, but milder than normal, with highs in the 65 to near 70 degree range.

HIGHS SUNDAY

Monday still looks to be the warmest of the bunch with highs well into the mid-70s on a gusty southwest wind.  Our next best shower and storm chance arrives during the afternoon Tuesday… but not before many hit the 70s again.

7DAY

It’s a long way out but computer models are aligning on a sharp trough (southward dip in the jet stream) to impact the eastern U.S. beginning Halloween and into next weekend.  The attached image below is GFS (top) & European (bottom) model temperatures the morning of November 1st, which if this verifies would be our first round of 20s.  This could impact the Indy Monumental Marathon.  Stay tuned and have a great evening – Sean Ash

NEXT WEEKEND

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Oct
22

Chilly Start But Brighter Wednesday On Tap

Posted By · October 22, 2014 at 4:05 am

Good Wednesday morning Central Indiana!  After some early morning clouds, on the eastern half of the state, we’re expecting a brighter day for much of the area.

WEATHERBUG

Chilly temperatures in the 30s to start but the sun helps highs rebound into the mid and upper 50s.

PLANNER AFTERNOON

PLANNER AFTERNOON HIGHS

Under a clear sky and calming wind temperatures will rapidly drop overnight.  Areas of frost are very possible Thursday morning withe lows in the mid 30s.  More sunshine on the way tomorrow and pleasant highs nearing 60 degrees.

LOWS RPM 2 RPM 3

A weak upper level system moves across the area Thursday evening that brings clouds and perhaps a few sprinkles or light showers Thursday night.  Some lingering clouds mix with sunshine Friday but we’re still targeting a warmer than normal set up heading into the weekend.

RPM 4 RPM 5 7day

Highs Saturday and Sunday will flirt with 70 degrees and temperatures early next week likely go well above 70.  Our next best chance of showers and some thunder will be along a cold front next Tuesday.  Have a great day – Sean Ash

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Oct
19

Chilly Start To What Becomes A Brighter Day

Posted By · October 19, 2014 at 5:22 am

Lingering low clouds and a north wind have kept the central Indiana from a widespread frost overnight.  Though some patchy frost remains possible in areas that do see clearing and where temperatures drop into the middle 30s.

SATRAD RPM COLTS

Either way it will be a chilly start for Colts tailgating, the Covered Bridge Festival, leaf viewing in Brown County or whatever else you have planned before noon.  Clouds this morning will slowly, but surely lessen and today eventually becomes brighter and certainly drier than Saturday.  As a result afternoon highs return to the upper 50s.

RPM 2 PLANNER AFTERNOON PLANNER EVENING RPM 3

Clouds increase again overnight in response to an approaching cold front and showers are possible by the time you wake Monday morning.  We’ll have a mix of sun and showers Monday afternoon with highs in the 60s

RPM 4 PLANNER MONDAY

Much of our weather this week will greatly be influenced by a developing storm in the northeastern U.S.  This will keep the wind predominantly from the north which results in cooler than normal temperatures until next weekend.

A string of mostly sunny days begins Wednesday and carries into next weekend when highs climb back into the middle 60s.  This dry spell is perfect timing for Harvest 2014!  Have a great Sunday – Sean Ash

7DAY

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