Category: GFS

February Tug Of War…

With data only encompassing the first couple days of the month, February has gotten off to a warm start.  As we know, the trend over the past 24 hours has been colder and this will continue as we open up the weekend.

conus_mtd_t2max_anom_2017However the cold air won’t last and milder times will return by the second half of the weekend.  This back and forth “tug of war” type regime will remain as cold and warmth (relative to average) continue to battle over the upcoming couple weeks.  The latest European ensemble shows this nicely.

EPS2317This also favors a rather active pattern and confidence is high on a wetter than average period upcoming over the next couple weeks.  See the GFS ensembles support this idea.  A couple strong storms are also possible Tuesday.

gfs-ens_apcpna_us_4Unfortunately for snow lovers, the majority of significant moisture should fall as rain.  Best snow chances appear to come with “backlash” wrap around snow showers and squalls Tuesday night into Wednesday morning.  Accumulating snow is possible, but most amounts should be light.  We’ll keep an eye on it.

gfs_ptype_slp_conus2_19Longer-term, the fight continues deeper into the month.  As mentioned this morning, teleconnections and analogs would suggest cold and wintry conditions, but modeling sure isn’t going in that direction as of yet.  The battle rages on and given the trends of the winter, it’s hard to bet against the warmer solutions, albeit with lower confidence than we’d like to have from this distance.

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Monday Evening Video Update…

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Saturday Night-Sunday Challenges…

Here’s our initial snowfall map, brought to you by dustytaylorphotography.com.

1stCallSnowfallMap11016

Permanent link to this article: https://indywx.com/6103/

Confidence Increasing On Leader-Follower Event; But Details Murky…

A look over model data from overnight suggests we need to focus on a “leader-follower” event for the upcoming weekend.

We’re confident the “leader” player is a rain maker for IN in the Thursday afternoon-Friday time frame (.40-.70 rainfall potential).

Source: Tropicaltidbits.com

Source: Tropicaltidbits.com

As we progress into the second half of the weekend, details get quite murky on the specifics with the secondary (follower) area of low pressure that develops along a pressing arctic front.

As we’ve been discussing, model solutions will vary within each respected model (GFS, Euro, GEM, etc.) in a run-to-run fashion.  Stack them up against one another, and we’ll likely continue to have as many different solutions as we do models that we’re looking at.  It’s a byproduct of a pattern transition and that crashing SOI (which is still crashing this morning, btw).  Case in point, note the various options below for Sunday.

The GFS takes a low from southern AL into the coastal plain of NC. Source: Tropicaltidbits.com

The GFS takes a low from southern AL into the coastal plain of NC. Source: Tropicaltidbits.com

The Canadian is a blend of the GFS and European as it tracks low pressure from eastern LA into the central Appalachians. Source: Tropicaltidbits.com

The Canadian is a blend of the GFS and European as it tracks low pressure from eastern LA into the central Appalachians. Source: Tropicaltidbits.com

The European is most aggressive in the west track as it takes low pressure from the MO bootheel into northern IN. Source: Tropicaltidbits.com

The European is most aggressive in the west track as it takes low pressure from the MO bootheel into northern IN. Source: Tropicaltidbits.com

Past experience with similar patterns certainly leads us to lean more towards the European/ Canadian solution over the GFS from this distance.  We know that models have their own biases though.  Time and time again the GFS bias is to rush things along a bit too much from this distance and become too progressive.  On the flip side, the European is notorious for dragging it’s heels a bit and, at times, can be too slow with bringing energy out of the west.  This in return impacts things downstream…

From this distance, we still can’t be too specific with snow/ precipitation prospects Sunday.  While confidence is increasing on at least some sort of snow to contend with, the significance of such isn’t possible to iron out at the moment.  Much fine tuning will be required.  Stay tuned.

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Periods Of Heavy Rain…

Saturday will dawn dry across the region, but that will quickly begin to change as morning progresses into afternoon. Moisture is streaming north and a “wavy” frontal system will remain…

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