- Category Archives GFS
Temperatures will attempt to approach seasonal norms Monday (average high this time of year is 40°) before arctic reinforcements blow into town Monday night and Tuesday.
This will keep highs in the middle 20s Tuesday with wind chill values in the single digits and teens most of the day.
Scattered snow showers and embedded lake-generated squalls will accompany this arctic surge Tuesday. As the wind trajectory sets up shop Tuesday afternoon, lake effect snow bands will impact portions of northeast and east-central Indiana.
Cold weather will continue to dominate through the work week and an additional upper level disturbance may try to ignite snow showers Thursday.
As we push into the 8-10 day time frame, a “relaxation” of the cold is anticipated, but, as we’ve been discussing, any sort of moderation will be brief in this weather pattern. Cold looks to continue to dominate, overall. With that said, there will be a window of opportunity early next week where temperatures will go above normal for a change and the European ensemble shows this brief moderation nicely.
This doesn’t last long as the pattern begins to reload as Christmas week approaches. As the evolution to a fresh cold pattern takes place, there’s a window of opportunity present for a more significant wintry system to potentially impact the Ohio Valley into the Mid Atlantic region. Notice the relatively “flat” ridge across the southern tier and associated tight thermal gradient. This look suggests we need to be on guard for the chance of a storm system to ride the thermal gradient in a west-to-east fashion, and has wintry implications for our region. Far too early for specifics; just know the possibility looms of a wintry event, locally, as Christmas week nears.
Speaking of Christmas, it sure appears as if cold will overwhelm the pattern for Christmas, itself, and the overall cold regime doesn’t show signs of letting up (with the exception of potentially a day or two) into the new year.
Today’s 12z model suite is in and it remains consistent on a more active weather pattern returning to the delight of many Hoosiers! A blend of the GFS and European 10-day rainfall numbers print out 2″ for Indianapolis. The GFS ensemble ‘mean’ (a blend of 21 individual members) agrees.
Best overall coverage of showers and thunderstorms should come in (3) waves over the upcoming 10-day period:
- Wednesday into Thursday
- Saturday into Sunday
- Middle parts of the following week
While we don’t see any sort of uniform type rains in the upcoming period, the “smattering” of storms should help most neighborhoods get in on the rainy “goods” at one time or another over the upcoming week and a half. Keep in mind, we’re in mid-June now and it’s mighty difficult to ask for anything much more than scattered storms this time of year on through late-summer…unless a tropical entity gets involved. That’s just the way this time of year is. With that said, localized torrential downpours are a very good bet from time to time, beginning as early as mid-week, as precipitable water values approach, or exceed, 2″ (about as moisture-rich as you can ask the air mass to get around these parts) into the upcoming weekend.
As I type this outside on the back porch this evening, I hear the sounds of sprinklers in full-force through the ‘hood. Thankfully, Mother Nature will help save on the water bill later this week. Longer-term, you’ll hear us use the word “transient” many times this summer when discussing the overall weather pattern. Thankfully that tends to result in a fairly busy time of things. Before you know it, college football season will be back (83 days until my beloved Auburn Tigers kick-off), those wetter autumn storms will return, and thoughts will begin to shift to winter (they may have already started here :-))- not that we’re trying to rush summer away or anything…
Through the short-term, there are two words that will sum up Indiana’s weather: Dry and Hot. We’re entering a stretch where the overall weather pattern will promote an expanding hot dome in the coming days, and put many communities across the state solidly in position to break the 90° mark on multiple days.
However, this increasingly hot and dry pattern will be a transient one. This morning’s European model shows the evolution to cooler and increasingly wet, unsettled times nicely as we progress into the 6-10 day period.
The GFS ensemble would also agree in the overall pattern shift back to cooler and unsettled conditions as early as mid-late next week.
Updated 7-day out later this afternoon! Enjoy a beautiful Saturday, friends!
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.
However 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.
This 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.
Unfortunately 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.
Longer-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.
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).
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.
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.