Category: Sleet

Mar 03

Cold Pattern Continues…

Tue.

Wed.

Thr.

Fri.

Sat.

Sun.

Mon.

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5/ 32

17/ 36

20/ 39

24/ 52

29/ 39

20/ 38

29/ 53

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Light

Light

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Light

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Forecast Updated 03.04.14 @ 8:22a

Sunny, But Cold…Another day of bright sunshine will help temperatures rebound to the freezing mark Tuesday afternoon.  While this is still well below normal and closer to the normal low for this date of 29 degrees, it’ll be a full 14 degrees “milder” than Monday’s high.  You know it’s been a cold winter when you’re saying the freezing mark is milder for a high in March.

Weak Weather Maker…A weak clipper system will move towards the region Wednesday evening into Thursday.  While this will be an accumulating snow producer for areas to our west, current thinking still moves this moisture towards our region, but with a dry air mass in place we think precipitation starts to fall apart as it moves in.  All of that said, light snow and scattered snow showers will fall for parts of the region Wednesday night into early Thursday.  We still think most don’t deal with much, if any, accumulation, but a light coating is possible in spots.  We’ll continue to monitor.

Eyeing Another Wintry Weekend…Modeling is still far from in agreement on the evolution of things on the weekend, but the general idea is one that brings a cold front through here Friday night into early Saturday morning with a wave of low pressure moving northeast out of the middle Mississippi River Valley into the eastern Ohio Valley Saturday.  With fresh cold air oozing south, combined with the associated track of the low, this is a potentially wintry set up for the region and we’re officially calling for a wintry mixture of light snow and/ or sleet across central Indiana Saturday.  The key word is light, but it could still be enough to create a few slick spots across the region.

Briefly Milder; Tracking The Next Significant Storm…The GFS and Canadian forecast models keep our region dry during the early to middle part of next week as a surface low tracks out of the Gulf and well south and east of our region.  On the other hand, the European forecast model winds a storm up much farther north and west and presents a heavy rain and possible thunderstorm threat here by Tuesday and Wednesday of next week.  We still have time to watch this and think the European may be a little too aggressive at present, but stay tuned.

What we are confident on is a briefly milder push of air early next week that could send temperatures well into the 50s.  Don’t get used to it, however, as yet another polar plunge arrives by the mid week stretch.

Upcoming 7-Day Precipitation Forecast

  • 7-Day Snowfall Forecast: 1-2″
  • 7-Day Rainfall Forecast: Less than 0.10″

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Permanent link to this article: https://indywx.com/a-record-cold-start-possible/

Mar 02

Accumulating Ice And Snow Then Frigid

Sun.

Mon.

Tue.

Wed.

Thr.

Fri.

Sat.

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16/ 23

9/ 19

4/ 28

10/ 30

18/ 38

27/ 50

22/ 37 

Moderate

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Light

Light

Forecast Updated: 03.02.14 @ 12:25a

Sunday Winter Storm…The well advertised winter storm is here and will make a mess of travel and plans for the second half of your weekend.  Moisture is streaming northeast over a bitterly cold air mass locked in place at the surface and this will create a mixture of sleet and freezing rain to quickly change to a mixture of sleet and snow during the early morning hours across central Indiana.

We forecast precipitation intensity to really begin to increase across the greater central Indiana region around 3-4 am.  Waves of accumulating snow will continue through the day, though it won’t snow all day.  In particular, we bracket 4am to 10am and then again early Sunday afternoon.

Finally, a wave of low pressure will eject into the Tennessee Valley Sunday night into Monday, continuing the significant snow and icing down state.  We anticipate the majority, if not all, of “round two” to bypass most of central Indiana to the south Sunday evening into early Monday.  So, what’s the culprit behind the suppression?  As mentioned in previous posts, a powerful arctic high will build south Sunday into Sunday night and this is the primary driver for the shift south in the surface low track.

All of that said, we’re still looking at significant accumulations of sleet and snow across central Indiana today, though reduced from the 6-8″ forecast we’ve had out since Thursday morning.  We now forecast 2-5″ of snow and sleet across central Indiana.  Needless to say, we’ll continue to monitor.  Sunday night will turn downright frigid across the region as temperatures crash into the upper single digits.

As a quick side note, we once again have to tip our cap to the Canadian forecast model.  It began to catch onto the southward shift with “phase 2” of the storm well in advance of the other model data (during the mid week period), including the highly touted European forecast model.

Frigid Start To The Work Week With Slow Mid Week Moderation…Fresh arctic air will be locked in place across the area to begin the new work week.  While it’ll be dry, temperatures will run as much as 30 degrees below seasonal norms.  The cold winter of 2013-2014 just doesn’t want to let up.

As we push into the mid week stretch we’ll note a powerful Gulf low that’s expected to push up the eastern seaboard. Early indications here keep us dry with slowly moderating temperatures.  Though we’ll remain well below normal, it’ll be a step in the right direction, so to speak, from the frigid early week start.

Weak Late Week System…The early take on late next week shows a cold front moving through Friday afternoon and evening. This may create a few rain showers Friday evening followed by light snow Friday night into Saturday morning as a fresh push of cold air blows into the state.  We have time to watch this and update as needed.

Upcoming 7-Day Precipitation Forecast

  • 7-Day Snowfall Forecast: 2-5″
  • 7-Day Rainfall Forecast: 0.25″

We’ll have fresh thoughts posted here and on our social media accounts through the day.  Have a nice Sunday and God Bless!  You can follow us on Twitter @indywx and become a friend of ours on Facebook by searching IndyWx.com.

Permanent link to this article: https://indywx.com/accumulating-ice-and-snow-then-frigid/

Feb 28

Some Late Night Thoughts…

It’s been a long day, but we’d like nothing more than to be right here in the good ole forecast office, digging into data for our next winter storm with you.  While “part 2” of the storm remains just offshore as of this post, it’ll likely be trudging onshore by the time you read this early Saturday morning.  That said, the initial wave of accumulating snow (and for some, ice) will arrive as early as late Saturday night/ wee morning hours (well before sunrise) Sunday in the form of an overrunning event- where comparably warmer, more moist air is lifted up and overruns the cold air at the surface.

Early ideas suggest we undergo a period of moderate to heavy wintry precipitation as early as 3-ish Sunday morning, extending into the late morning hours.  Particularly, we bracket the hours of 3am to 10am Sunday for the initial wave of wintry weather.  This will be a mixed bag of precipitation, including snow, sleet, and freezing rain across central Indiana.  An early look at the high resolution simulated radar courtesy of the NAM shows this well- valid 7am Sunday morning.  Image is courtesy of the fine folks over at Weatherbell Analytics.

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After a “lull” in the accumulating wintry precipitation from late morning/ early afternoon Sunday, we’ll likely deal with another round of moderate to heavy accumulating wintry precipitation Sunday afternoon into Sunday night.  It’s important to note this is where we have more questions than answers in regards to the interaction of a juiced up southern stream of the jet- infused by the powerhouse late season winter storm (still spinning just off shore as of this update).  Powerful arctic high pressure will be sinking south and could result in a more suppressed track of the low. Should this be the correct scenario snow totals would likely be towards the lower end of the ongoing 6-8″ forecast we hoisted back on Thursday morning.  That said, one can’t ignore the pattern as it’s one notorious for heavy snow producers across central Indiana.  A scan over heavy snow events of the past here across central Indiana show similar setups that have yielded impressive snow totals.  Just as the potential of suppression has to be noted, so should the potential of a slightly more north trend that models may currently see as time gets closer.

In closing tonight, 12z model data should really begin to hone in on the area most likely to see heaviest snow and/ or ice accumulations.  Our ongoing forecast of storm totals remains unchanged for now of 6-8″.  Stay tuned, friends.

Permanent link to this article: https://indywx.com/some-late-night-thoughts/

Feb 28

More On This Weekend’s Winter Storm…

As we’ve been discussing, a significant winter storm is developing this weekend.  The set up is one that will feature an arctic cold front sinking south and stalling out across southern and central Indiana Saturday night.  Low pressure will then organize over the Ark-la-tex region and head northeast, tracking into the northern Tennessee Valley Sunday and Sunday night.  The low will move off the southern Mid Atlantic coastline Monday evening.  This will be more of a prolonged event when compared to our last two winter storms as waves of moderate to heavy snow move into central Indiana beginning late Saturday night.

This is an ominous set up for more heavy snow across central Indiana- one that’s notorious for heavy snow events across central Indiana.  We hoisted our initial snowfall forecast Thursday morning and placed central Indiana under the threat for 6-8″.  As of this morning, we’re remaining firm on that idea.  It should be noted that the GFS remains very bullish on heavier totals (and consistent, as well), but it should also be pointed out it’s somewhat of an outlier as of this morning as the GEM and ECMWF are more suppressed with lighter totals.  All of that said, we lean more towards the GFS solution versus the more suppressed Canadian and, to some extent, European forecast model.  Should the other model data begin to trend towards the snowfall idea per the GFS then the initial 6-8″ forecast will have to be adjusted upward.  The storm is just now coming onshore and will be sampled better with model runs later today.

Any way you slice it, a significant and disruptive winter storm is brewing this weekend and could make an absolute mess of your Sunday and Monday.  A shot of bitterly cold air will flow in behind our departing storm early next week.

Our current accumulation idea and storm track can be found below:  We’ll have another update here late tonight and you can keep up-to-date with all of our thoughts on the go on Twitter (@indywx).

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Permanent link to this article: https://indywx.com/more-on-this-weekends-winter-storm/

Feb 28

Winter Storm Watch Hoisted

URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE INDIANAPOLIS IN 405 AM EST FRI FEB 28 2014 ...WINTER STORM TO AFFECT CENTRAL INDIANA... .A WINTER STORM IS PROGGED TO MOVE…

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