• Category Archives Sleet
  • Unseasonably Cold; Weekend Ends Messy…

    Highlights:

    • Filtered sunshine today
    • Raw and messy Sunday
    • Fast-moving weather pattern next week

    Bundle Up…Wake up temperatures are more like we’d expect in late December as opposed to early November, including lower to middle 20s across central Indiana.  Filtered sunshine will eventually give way to a thickening cloud deck late.  Those clouds will be a harbinger of things to come as moisture overspreads the region Sunday morning.  Look for a cold, raw close to the weekend with periods of light rain (sleet may mix in with the rain during the onset early Sunday, but this won’t be a big deal).

    We’ll open up the work week with dry and chilly conditions before a couple of fast-moving systems impact our mid and late week weather.  Clouds will increase Tuesday and showers will arrive at night, continuing into Wednesday.  Our next (stronger) storm will arrive to wrap up the work week.  A southwesterly air flow will inject briefly milder air Friday morning and may be sufficient enough to create a couple of thunderstorms.  We’ll then transition to a much colder, windy regime to wrap up Friday with falling temperatures.

    Upcoming 7-Day Precipitation Forecast:

    • Snowfall: 0.00″
    • Rainfall: 1.00″ – 1.50″


  • A Cold Halloween On Tap…

    Highlights:

    • Cold and blustery Halloween
    • Unsettled, milder weather builds in
    • Stronger cold front arrives early next week

    Spooky Winds…Northerly breezes are strong and gusty and leading to wind chills in the lower-middle 20s across central Indiana this morning.  Heavier winter coats will be a smart choice out the door!  Otherwise, we’re a state divided from a cloud perspective: the southern half of Indiana will get in on the sunny act much sooner than the northern half of the state.  As we look towards the all-important trick-or-treat weather tonight, anticipate dry conditions, lighter winds, and unseasonably chilly conditions continuing.

    Our next storm system will approach Wednesday with showers.  Rain may be mixed with wet snow or sleet Wednesday morning, but with temperatures above freezing, don’t look for any accumulation.  Periods of showers and light rain will continue Thursday into Friday morning.  Heavy rain won’t occur, but it’ll be damp at times.  Saturday is a bit tricky- some solutions keep rain around, but we’re choosing the more “optimistic” approach for the purpose of this forecast update.  Stay tuned.

    Saturday will feature considerable cloudiness, slightly cooler air, and breezy conditions before a warmer close to the weekend.  A southwesterly flow will help boost highs into the upper 60s Sunday afternoon ahead of an approaching cold front.  That cold front will slide through here with showers and a couple claps of thunder Monday.  Much colder air returns Monday night into Tuesday.

    Upcoming 7-Day Precipitation Forecast:

    • Snowfall: Trace
    • Rainfall: 0.50″ – 1.00″


  • Thursday Morning Weather Rambles…

    1.)  All of a sudden what was a warm March has revered big time.  Officially, Indianapolis is running close to 1° below normal on the month and will continue to fall further once today’s data is factored in.  Always fun to see Mother Nature “balance” things out.

    2.)  It’s another cold start to the day with many central Indiana neighborhoods in the teens and hard freezes extending south into Florida this morning.

    3.)  Sunshine can be expected today and after the frigid beginning, a moderating trend will begin this afternoon that will send temperatures into the lower to middle 40s.  That’s still close to 10° below average for daytime highs, but will feel much better than what we’ve been dealing with over the past several days.  Add in that high March sun angle and it’ll actually be a very pleasant afternoon.

    4.)  Unfortunately, we won’t hang on to the sunshine for St. Patrick’s Day.  A warm front will lift northeast through the region during the overnight and lead to an increase in clouds by evening.  A wintry mix of sleet and freezing rain will impact central IN predawn Friday morning before transitioning to showers mid-to-late morning.  “Light” is the key word here with models suggesting less than 0.20″ total.  By Friday afternoon we’re back to dry times.

    5.)  We’ll turn a touch cooler Saturday and it’ll be a blustery day, as well.  A couple of early snow showers are possible across east and northeast portions of the state before afternoon sunshine returns.  High pressure settles in overhead Saturday evening and will set up a nice second half of the weekend- lots of sunshine and milder temperatures by Sunday (lower 50s).

    6.)  Looking ahead, the quiet times will be hard to come by as we progress through the latter portions of the month.  Both the new JMA Weeklies (shown below) and other ensemble guidance is bullish on a wetter than average close to the month, and also one that features wild temperature swings.  Thoughts shift back to severe prospects, especially for our friends to our south and the potential of backlash wet snow showers in the colder air.  From a temperature perspective, it’s a pattern that will be very “transient” with no true long-lasting periods of significant warmth, or cold- relative to average.


  • Prolonged Stretch Of Gloomy Weather…

    screen-shot-2017-01-10-at-7-25-16-amHighlights:

    • Active stretch of weather begins
    • Moderating trend into midweek
    • Ice concerns Friday-Saturday

    Sunglasses NOT Required…We’re entering the beginning of an active stretch of weather, with an extended period of overcast skies and gloomy conditions.  Let’s dive in and take the challenges one-by-one:

    Showers develop this afternoon as a cold front moves into the state.  Ahead of the front, strong southwest winds will gust upwards of 45 MPH+.  A “big hair warning” is in effect.  🙂

    A brief shot of colder air will arrive late tonight into Wednesday, but just as soon as it arrives, it’ll leave and temperatures will approach 60 Wednesday night as showers return.

    Thursday will be a wet day with periods of rain and slowly falling temperatures during the afternoon/ evening.

    Friday is much colder as the arctic front will be to our south, but most of the day looks dry.  Moisture will lift north Friday afternoon and evening and with cold air in place, the precipitation should take the form of a mixture of freezing rain and sleet.  Periods of freezing rain likely continue Saturday.  It’s far too early to discuss amounts and we also want to reiterate the difference of 1-2 degrees will mean a world of difference between areas dealing with ice versus a cold rain.  The “battle zone” looks to take place across central IN.  If you have travel plans Friday night and Saturday, please keep abreast of later forecasts and updates.

    Regardless of whether or not we’re dealing with icy conditions across central IN during the first half of the weekend, temperatures will warm during the second half of the weekend and change any frozen/ freezing precipitation over to plain ole cold rain Sunday into Monday.

    Upcoming 7-Day Precipitation Forecast:

    • Snowfall: 0.00″
    • Rainfall: 1.50″ – 2.00″


  • Changeable Weather; Late Week Ice Threat…

    screen-shot-2017-01-08-at-10-01-49-amHighlights:

    • Another bitter day
    • Moderating temperatures ahead
    • Late week ice threat looms

    Bitter Cold Gives Way To Moderating Temperatures…The first half of the forecast period is easy, but we caution big time headaches loom and details are far from etched in stone once to the second half of this forecast period.

    First thing’s first and that’s today.  Look for a continuation of bitterly cold air, but slow moderation will be noted this afternoon: Not AS bitter and lighter winds.  We may even crack the 20 degree mark!  I know, break out the swim suits, right?!  This moderating trend is setting the tone for a more significant jump in the mercury later in the week.  Before a “taste of spring” arrives, we’ll have to deal with a brief opportunity for freezing drizzle Monday evening.  Temperatures will zoom to around 50 Tuesday and around 60 for mid week.  Showers will be with us off and on- focused on Tuesday and Thursday for most widespread coverage.

    Then comes the “fun.”  A strong, sprawling arctic high will push south into the northern Plains Friday.  At the same time, “resistance” from the southeast ridge (that can be thanked for the spring-like feel here Wednesday and Thursday) will result in the arctic front only slowly being able to push south.  Ripples of energy, or waves of low pressure, will move along the arctic boundary and result in periods of widespread precipitation Friday into the weekend.  As the cold, dense arctic air oozes south, we have concern for icing- freezing rain and sleet Friday into Saturday.  Depending on how things evolve, this may continue into Sunday, as well.  If you have travel plans this weekend, please keep a close eye on the developments in the forecast from Friday on.  Stay tuned.

    Upcoming 7-Day Precipitation Forecast:

    Snowfall: 1.00″

    Rainfall: 1.50″ – 2.00″


  • Bitter Weekend; Changeable Weather Next Week…

    screen-shot-2017-01-06-at-6-33-47-pmHighlights:

    • Bitterly cold weekend
    • Big shift in temperatures next week
    • Icy set-up late next week?

    Heavy Winter Gear Required…We’ll watch a significant winter storm impact the southern states this weekend with heavy snow and ice accumulations.  Here on the home-front, expect bitterly cold conditions with dry skies.  Clouds tonight should keep most areas around zero.  That’s frigid in and of itself, but should skies clear, temperatures will easily fall below zero.  Very cold conditions remain Sunday.

    We’ll back our air flow around to the southwest early next week and this will help give temperatures a big boost by the mid week period.  Gusty southwest winds and showers will be with us, as well.

    A complex weather pattern will set up to close out the week.  The clash of air masses between a sprawling strong arctic high and an equally impressive southeast ridge will be fun to watch, but not to forecast.  It’s very possible unseasonably warm conditions of Thursday give way to much colder weather going into next weekend as the arctic high helps “ooze” dense, shallow, cold air south.  At the same time, waves of low pressure will move along the pressing arctic front and periods of heavy precipitation will result.  Conditions should grow cold enough by Friday into Saturday for the precipitation to fall as an icy mixture of sleet and freezing rain across portions of central Indiana.  Stay tuned.

    Upcoming 7-Day Precipitation Forecast:

    • Snowfall:  Trace
    • Rainfall:  1.50″ – 2.50″


  • Icy Concerns Grow Again Tonight…

    After a night of freezing rain, many roadways throughout central IN remain glazed over and hazardous as of this update.  If you absolutely don’t have to travel today, please don’t.  Allow road crews to do their job.  Additionally, we have growing concerns of a new round of freezing rain to sleet and eventually snow tonight.  Lingering moisture on roadways will result in “flash freeze” conditions and treacherous travel tonight into Sunday.

    First, a tip of the hat to short-term modeling, including the NAM, for suggesting we’d have a very difficult time eroding the shallow arctic air at the surface across most of central IN today.  While we never bought into the mid/ upper 50s idea the GFS and Euro were once suggesting, we did initially think 40s were in store today.  Forget about it.  Mid to potentially upper 30s are the best we can do today and temperatures will crash this evening as not one, but two, arctic fronts push through central IN.  Even if we didn’t have additional precipitation inbound tonight, “flash freeze” conditions would develop from lingering moisture and lead to renewed problems on area roadways.  Throw in another wave of low pressure riding along the pressing arctic front and a whole slew of problems will develop yet again from a freezing and frozen precipitation perspective.

    Note the incredible temperature gradient from downstate to central and northern Indiana early this afternoon.

    hrrr_t2m_indy_6The heavy, dense, arctic air will win out as evening turns into nighttime.  Indianapolis is back to the freezing mark around 6p and into the 20s by 9p.

    hrrr_t2m_indy_10

    hrrr_t2m_indy_13Temperatures will continue to fall through the day Sunday and by Monday morning central Indiana will be in the single digits, with below zero readings across northern parts of the state.

    hires_t2m_indy_49Wind chill values of 10 to 20 degrees below zero will be common by Sunday night into Monday morning across central Indiana.

    gfs_windchill_indy_8Areas of drizzle and freezing drizzle will continue across the region into the early afternoon, but begin to expand in coverage and intensity once again by evening.  Note the area of freezing rain expand across central IN, including Indianapolis, between 4p and 7p.

    4p

    6p

    7pFreezing rain will eventually begin to mix with sleet and eventually transition to light snow during the overnight from northwest to southeast.  A coating of snow to less than 1″ is a good bet on the new icy glaze that develops tonight.

    When you factor in the current hazardous conditions in place along with the fresh push of arctic air and precipitation tonight, it’s a good idea to hunker down inside and remain off area roadways.  We have big concerns of new travel problems developing by evening across central Indiana.  By this time tomorrow, our attention will turn to the bitterly cold air and dangerous wind chill values developing.

    More later, including prospects of snow around Christmas.  As always, you can follow our updates on social media by following us on Twitter (@indywx) and Facebook.  Stay safe!

     


  • Active Winter Pattern Rumbles Along…

    screen-shot-2016-12-15-at-7-44-16-pmHighlights:

    • Busy weather weekend
    • Fresh shot of bitterly cold air
    • Christmas week snow chances

    Buckle Up For A Busy Winter Pattern…Thursday featured the coldest December 15th high (13 degrees) in a whopping 27 years. Talk about impressive.  This was good for an amazing 26 degrees below average.  Let that sink in…

    We’ll wrap up the work week and head into the busy weekend before Christmas with a new round of challenges.  A couple of warm fronts will lift north through central IN Friday.  Snow showers may accompany the first warm front early Friday before the second warm front lifts north Friday night.  This will result in more widespread wintry precipitation, likely to begin as a period of light snow before a quick transition to sleet and freezing drizzle during the overnight.  Temperatures will warm overnight Friday and precipitation will change to light rain Saturday morning.  That’s when our attention turns to the first of two cold fronts that will sweep through the state.  The first cold front will lead to a quick changeover to sleet and snow Saturday evening (thinking between 6p-8p as of now).  As a secondary wave of moisture moves northeast along the boundary, expect a light accumulation of snow Saturday night.  The second cold front (arctic) will blow through late Saturday night and early Sunday morning and lead to a frigid Sunday.  That 25 degree high you see Sunday will come at midnight as temperatures crash through the day.  Add in a stiff northwest wind and wind chill values will fall below zero (yet again) in the Sunday-Monday time frame.

    We’ll briefly calm things down during the early Christmas week period and remain cold.  Our next storm system is slated for a mid week arrival and could deliver a round of accumulating snow Wednesday night into Thursday morning.  More on that after this weekend system.

    Upcoming 7-Day Precipitation Forecast:

    • Snowfall: 2″ – 4″
    • Rainfall: 0.20″ – 0.40″


  • “Not Fit For Man Nor Beast;” Winter Issues This Weekend…

    screen-shot-2016-12-14-at-9-20-36-pmHighlights:

    • Bitter feel
    • Weekend storm
    • Reinforcing arctic air to open Christmas week

    Heavy Winter Gear Required…An arctic cold front slammed into central IN Wednesday evening with plummeting temperatures, strong and gusty (40 MPH) winds, blowing snow, and just a downright “rude” feel.  Those bitter conditions will remain through the close of the work week, including dangerous wind chills Thursday.  In fact, we still expect wind chills to fall into the 10-20 degree below zero range through the morning, and remain below zero most of the day.

    We’ll flip the page and turn our attention to our next storm system as we rumble into the weekend.  Clouds will increase Friday and moisture will begin to override the cold air locked in place at the surface by the evening and nighttime.  With sub-freezing air still present, this moisture will likely fall as a combination of sleet and freezing rain across central Indiana Friday night.  Eventually, temperatures will warm (briefly) above freezing Saturday morning and allow precipitation to transition to light rain.  Before that takes place, slick road conditions could develop Friday night from the sleet/ freezing rain mixture.  Needless to say, we’ll keep a close eye on the latest data as it comes in.

    Almost as fast as we go above freezing Saturday, temperatures will begin to fall once again during the afternoon and evening as heavy, dense, arctic air “oozes” southeast.  As this is happening, a second wave of moisture will ride northeast along the pressing arctic cold front.  We expect precipitation to break out yet again Saturday evening and night, and fall as a wintry mix before ending as snow.  (Additional light ice and snow accumulation potential).

    Temperatures will fall through the day Sunday along with strong and gusty NW winds.  Wind chills will once again fall below zero Sunday evening into Monday morning…

    While the frigid conditions will “relax” as we go into the middle of Christmas week, we have an eyebrow raised for the potential of “fun and games” just beyond the current 7-day period.  Far too early for specifics, but the potential of wintry prospects around Christmas are alive and kicking…

    Upcoming 7-Day Precipitation Forecast:

    • Rainfall:  0.25″ – 0.50″
    • Snowfall:  1″ – 2″

     


  • Wednesday Morning Weather Rambles…

    1.)  Talk about number-busting cold.  With a fresh snowpack and clear skies overnight, temperatures plummeted (even colder than some high resolution data suggested yesterday evening). Officially, it’s the coldest December morning in Indianapolis since Christmas Eve 2013.  We note even a few communities below zero (talking about you Crawfordsville, Zionsville, and Greenfield).

    Even colder air rushes in tonight behind a secondary arctic cold front.  Expect an increase in cloudiness, scattered snow flurries, and strengthening NW winds by late afternoon and early evening.  As the reinforcing bitter air pours into the region, wind chill values will fall to 10-20 below zero tonight into Thursday morning.  That’s dangerous stuff, friends, and requires limited time outdoors.  The National Weather Service has issued a *Wind Chill Advisory* 10p this evening until 11a Thursday.

    gfs_windchill_indy_62.)  Our next storm will approach Friday evening. Clouds will increase and thicken as the day gives way to evening and a wintry mix of snow, sleet, and freezing rain will overspread central IN Friday night.  With snow on the ground and the recent bitter blast, we have concerns the cold air won’t be “dislodged” as quickly as last weekend.  The end result may be a period of accumulating freezing rain/ sleet Friday night into early Saturday morning.  We’ll keep a close eye on things.

    nam_ptype_slp_mc_25Regardless, icy precipitation will transition to rain during the day Saturday as temperatures briefly surge above freezing.  “Brief” is the key word there as temperatures plummet Saturday night, courtesy of fresh arctic air oozing back in.  A secondary wave of moisture may result in additional wintry issues Saturday night.  Additionally, with sharply colder air returning, “flash freeze” concerns loom Saturday night, as well.

    3.)  Another “lobe” of arctic air will plunge into the area Saturday night and help set-up a frigid close to the weekend.  We’ll have to be on sub-zero watch again.

    d44.)  Our attention then shifts to what may very well be an active Christmas week in the weather department.  We continue to think the frigid times of this week will relax.  That said, it’ll remain cold enough with a favorable storm track to result in wintry issues as Christmas nears.  Far too early for specifics with this 10+ days out, but keep it in the back of your mind that the weather pattern continues to look active and at least present a threat of wintry precipitation at times Christmas week.

    ecmwf-ens_z500a_us_10