Category: Weather Rambles

Friday Morning Rambles; Looking Ahead…

1.) A cold close to the work week can be expected with highs today only topping out in the upper 20s (average highs are in the upper 30s).

gefs_t2ma_1d_noram_52.) What at one time looked to be a significant weekend storm now may not even deliver any precipitation at all to the region.  A flurry is possible, but most should remain precipitation-free this weekend. Expect a gusty southwest wind developing SB Sunday.  Highs around freezing Saturday will zoom into the middle 40s Sunday.  Lows Saturday morning in the middle 10s will rise into the upper 20s to around 30 Sunday morning.

gfs_ptype_slp_conus2_93.) A more significant storm system will cut for the Great Lakes early next week and this will deliver gusty showers and embedded thunderstorms.  A couple of stronger storms aren’t out of the question.  Locally heavy rains can be expected, including amounts of 1″-1.5″ (locally heavier totals).

gfs_ptype_slp_conus2_19

gfs_tprecip_indy_224.)  Cold air will rush back into the region behind the storm and snow showers and squalls are likely by Wednesday.

gfs_ptype_slp_conus2_22

gfs_t2m_a_f_conus2_245.) Longer-term, a real fight is developing on the overall direction we’re heading as February evolves.  Analog methods and teleconnections (shown below) would yield bullish cold signals and give hope to winter enthusiasts.  However, modeling isn’t in agreement on the wintry ideas.  In fact, some modeling is very spring-like as mid-Feb nears.  Stay tuned as we try and iron out the details this weekend. Updates will come.

02.01.17Teleconnections

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Wednesday Morning Weather Brief…

Your complete weekly discussion can be found in the post below from last night, but here’s a recap of our current 7-day:

Screen Shot 2017-01-24 at 9.49.46 PMShowers will expand in overall coverage as we progress through the late morning hours, but shouldn’t amount to much (0.10″ for a few neighborhoods).  We return to a drier theme this afternoon.

10a forecast radar

10a forecast radar

11a forecast radar

11a forecast radar

A mild and windy afternoon is ahead, including gusts close to 40 MPH and highs in the lower-middle 50s.

Colder air will return tonight and remain in place through the second half of the work week, including the upcoming weekend.  Temperatures will grow cold enough Thursday morning for scattered snow showers.

Low-mid 30s Thursday morning

Low-mid 30s Thursday morning

Upper level energy will keep scattered snow showers going late week and on into the weekend.  Models can struggle on timing and specifics of the pieces of energy and we’ll keep an eye on things into the weekend.  Potential is present for a more “robust” clipper Sunday that could yield better coverage of steady snow showers.

gfs_namer_106_500_vort_ht_sLonger term, the GFS ensemble continues to show the cold growing deeper and stronger for the region as we progress into early February.  Winter is far from over.

gfs-ens_T2maMean_us_5

gfs-ens_T2maMean_us_8gfs-ens_T2maMean_us_10gfs-ens_T2maMean_us_12

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Winter Returns…

January got off to a frigid start.  Remember this coast-to-coast cold, including sub-zero temperatures across central IN, during the first week of the month?

t0-1024x818After the past week to ten days, that frigid open to the month seems like forever ago!  The past 7-10 days has featured a significant January thaw, and temperatures now, MTD, are warmer than average across the Ohio Valley.  Warmest anomalies can be found across the southeast region.

conus_mtd_t2max_anom_2017That said, the pattern is shifting back to winter for the last week of the month and while the duration, longer-term, can be argued, the next 2-3 weeks appear to offer an opportunity to play “catch up” in both the snow and cold departments.  Note the developing eastern troughiness.  This will bring colder air back into the east as we close January and open February.  The GFS ensembles, courtesy of Tropicaltidbits.com, also develops an interesting “blocky” look towards the end of the period in Week 2.  Should this verify, it would lead to a better chance of the cold, active pattern locking in.

GEFS2wk12417
You’re corresponding temperature anomalies show the shift back to a colder than normal regime.

Days 2-6

Days 2-6

Days 4-8

Days 4-8

Days 6-10

Days 6-10

Days 12-16

Days 12-16

A fast northwest flow will also result in multiple “pieces” of energy rotating southeast and we’ll forecast a period of snow showers by mid and late week, continuing into the weekend.  There’s the chance of a stronger clipper system sometime in the Sunday-Tuesday time frame that we’ll have to keep a close eye on.  We want to stress that global modeling will struggle with the specifics (timing and strength) of these clipper systems until within a couple days.

Longer term, while confidence is high on the evolution to a cold, wintry regime through the medium range, the longevity and sustainability of the cold is in question.  For instance, by Day 10 (as the GFS continues to drill cold into the region), the European ensembles are much less impressed and suggest the overall transient pattern we’ve dealt with for the balance of the winter continues:

ecmwf-ens_z500aNorm_namer_11

ecmwf-ens_T850a_namer_11Thinking here at IndyWx.com believes the European is likely rushing the warmer central look.  Time will tell…

**We do note the NEW European Weeklies lock a period of cold into the east from mid-February through early March, including a stormy (snowy) look.  Will Old Man Winter have the final say?

Updated 7-day later this evening!

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Quick Friday Evening Notes…

1.)  While we’re still expecting freezing rain across central Indiana tonight into the early morning hours Saturday, dry air will really limit totals.  Instead of the 0.10″-0.20″ of glaze per…

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Winter Having A Tough Time Finding Staying Power…

Through (5) weeks of meteorological winter, it’s been a frustrating time for snow and cold weather enthusiasts across the beautiful state of Indiana.  We’ve seen a few storms cut into the central Lakes, taking their respected snow swaths northwest of central Indiana.  Despite an “overachieving” arctic wave on the 13th and an icy glaze event the following Friday night, it’s been a rather uneventful winter so far.  In ironic fashion, a significant winter event is poised to impact portions of the Lower 48 this weekend, but the general consensus in modeling is for this event not to cut northwest, but, instead, remain suppressed and impact portions of the TN Valley and Southern Appalachians with heavy snow.  Now, sure, there’s still time for this to “correct” north, but as of this writing, there’s just as much argument in the suppressed idea.

Admittedly, we, personally, believed we would be much farther along in the snowfall department than we are through the first 1/3 of meteorological winter.  Looking ahead, there really isn’t much to “like” about the longer term data as far as getting snow prospects. Sure, an arctic shot is still inbound come mid week with very cold air.  We note AK ridging and blocking “trying” to develop over Greenland.

gfs-ens_z500amean_namer_1This will take us through mid week and into the weekend with lows in the single digits and lower teens and highs generally in the lower and middle 20s.  We still need to watch Thursday evening-night for a wave of low pressure that may attempt to deliver light snow, but this doesn’t look like a significant event from this distance.

Additionally, we’ll keep a close eye on the weekend for the prospects of snow, but confidence remains very low in regards to this system.  The GFS ensemble members show the wide range of possibilities Saturday.  Taken verbatim, the respected (or not ;-)) solutions, range from “no snow for you” scenarios to a big hit.

gefs_ptype_ens_ky_22To further complicate matters, the European and Canadian solutions are much less robust and result in a more suppressed scenario.  Forecasters (including yours truly) can only wish for the days to return of worrying about respected snow/ mix/ rain lines amongst the various data, versus the present time of models showing a storm only to take it away from run-to-run and other modeling not even showing the storm.

But once to mid-month, the overall pattern is forecast to break down yet again and results in a much warmer look for the east.

gfs-ens_z500amean_namer_12That brings us to our next point and that’s the modeling performance, itself.  For really the better part of a year now, modeling has been poor, at best- even in the short-term solutions.  More recently speaking to the last few months, I can’t recall model data ever performing worse (13 years of forecasting experience).  It leads to a very low confidence forecast in basically anything beyond (7) days right now.  Additionally, conflicting signals are present (as posted this morning, the AO, EPO, WPO favor cold versus the MJO strongly favoring warmth in the longer range).  The signals are competing with themselves to try and take over the overall weather pattern for mid and late winter, but I’m not sure we’re really ever going to get to a point where we “lock-in” to any one particular warm or cold pattern for any sustained length of time this winter.  As far as snow goes, there’s no way in early January you’ll ever see us greatly alter the long-standing ideas posted originally in the winter outlook.  When a given city averages 26″ of snow on the winter, it only takes one storm to come along and put you in a “good spot” (relative to average).  That said, we hear your frustrations (and know they will only grow louder this weekend if our friends down south cash in on the snowy goods).  Once to late January, we’ll revisit this idea.

The one thing we try to do here is eliminate the “noise” in the short, mid, and long range data by analyzing it all and building a forecast using a blend of the said data, along with teleconnections, etc.  You’ll never see us update our forecast based on a model run every time in comes in.  We don’t buy into the idea of “knee jerk” forecasting.  Let’s sit back and watch the next few days unfold.  Unfortunately, in this weather pattern, we just don’t see confidence increasing in forecasts much past the 3-7 day window at this juncture.

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