Category: Forecast Models

Oct 17

Pattern Evolution Through Late October…

The teleconnections are aligning in a manner that favors a colder than average period of weather by late-October standards. Note the PNA trend positive while the EPO heads negative. The AO and NAO also follow suit.

The sum of all of the above should feature a predominant western ridge for late month with a persistent eastern trough- at times deeper than others.

Add in the fact that the MJO is anticipated to swing into Phase 2 and this further serves to increase confidence in the colder shift.

The models are focusing in on the colder close to the month and though specifics will continue to vary from run-to-run, the primary message that we want to convey is to expect a colder than average 2nd half of the month with an active storm track. As pops of more “winter-like” air get involved behind one or two of the late month storms, pre-Halloween flakes may fly across a portion of the Ohio Valley.

Days 3-8
Days 8-13
Days 10-15

Given the pattern progression and anticipated teleconnection states, we think it’s wise to ensure the kiddos have a warm Halloween costume this year!

Permanent link to this article: https://indywx.com/pattern-evolution-through-late-october/

Oct 16

VIDEO: Predominantly Colder Than Average Pattern Takes Hold; Timing Out Storm Systems Through The 2nd Half Of October…

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Oct 15

Evening Video: A Tale Of Extended Summer That Gives Way To Sudden Winter…

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Oct 15

VIDEO: Rain Develops By Evening; Potential Of Pre-Halloween Snow?

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Oct 14

Taste Of Winter Before Month’s End?

A cold front will whip through central Indiana Tuesday evening. Showers will accompany the frontal passage, but we still don’t anticipate much in the way of significant moisture across central Indiana. Heavier rainfall totals in excess of 0.50″ will likely fall across drought-stricken areas downstate.

Colder and blustery conditions will be with us Wednesday and Thursday, including wind chills in the upper 20s at times Wednesday morning.

A moderating trend will get underway this weekend as a gusty southwesterly breeze takes hold on the backside of retreating high pressure. This will lead to a couple of days of above normal warmth early next week (not quite done with the 70s just yet).

We’ll continue to monitor for a wet and stormy time of things Monday PM into Tuesday. The severe threat is to be determined and will require fine tuning as we push ahead over the next several days.

Once this area of low pressure and associated cold front blow through, colder air will arrive on gusty northwest winds by the middle to latter portions of next week.

This will set the tone for a rather significant colder shift as we get set to put a bow on the month of October. A secondary and more significant trough will descend into the region just after Day 10. With a developing negative EPO, positive PNA, and MJO heading for Phase 2, it’s time to start “beating the cold drum” a bit harder. In fact, latest 500mb charts would indicate there’s the potential of at least a little wintry mischief present to go along with the colder shift.

This should at least kick up the lake effect snow guns for the first time this season, and we’ll have to monitor things for the possibility of “backside” energy digging south at the base of the trough that would present the possibility of a little early season snow across parts of the Ohio Valley region as Halloween week nears…

Times, they are, indeed, ‘a changing…

Permanent link to this article: https://indywx.com/taste-of-winter-before-months-end/