State of the Chase Season: 2017 Edition

Thursday could be a sleeper chase close to home...then yeah the cap looks hellish but the 11-15 still look decent in the N Plains, possibly shifting south later in the period, in GFS land at least which has trended towards a slightly deeper secondary trough mid month. Hopefully everything won't evaporate the way much has this abysmal season...
 
I took off the 15th and 19th to coincide with my driver being in town to chase. The 17th of June is the climatological max for tornadoes in Nebraska. The pattern appears to be shaping up with via the GFS and CFS. All we need is 2-3 days of strong south / southeasterly winds and temps near 90/70 and I think we'll be in luck. Never underestimate the power of convergence along a stationary front in the plains when there is 6000 cape.

If that week doesn't produce, I'll be willing to call it total fail for 2017.
 
I personally am eyeing a trip from sunday- tuesday with my friend since that is the best timeframe in the near future for us. Hoping Sunday in Minnesota/Dakotas, then back SW a bit for Neb/KS/Iowa on Monday/Tuesday. That's best case scenario. Unfortunately, Wednesday-Sunday is kinda out of the question for me so I hope to make this upcoming period work. I'm biding a little more time to post in the target area until it gets close.
 
I'm not really understanding the negativity and/or lack of posting/chatting about this weekend and beyond. Pattern is 100000000 times better than what we have had, yes the cap is gonna be strong but there are gonna be SEVERE storms over CHASABLE terrain for the majority of next weekend and the following week! It's go time!

I think people have been afraid to jinx it. 12z GFS coming very tantalizing for Sunday evening over eastern North Dakota, but how many times this season have we seen these "favorable patterns" at +100 hours go to crap on the models right about the time people start talking them up? Still, I technically already had my "(non)chasecation" May 26 - June 1 and if I want next Monday off so I can chase 8-ish hours away Sunday evening, I pretty much have to make a decision by tomorrow at the latest.
 
I'm not really understanding the negativity and/or lack of posting/chatting about this weekend and beyond. Pattern is 100000000 times better than what we have had, yes the cap is gonna be strong but there are gonna be SEVERE storms over CHASABLE terrain for the majority of next weekend and the following week! It's go time!


My negativity comes from bitterness about the pattern finally becoming favorable only after my originally-scheduled chase vacation of 5/26-6/10 ends, a chase vacation which featured only two chase days and then four down days, after which we bailed. By this weekend we're looking at, what, 14 consecutive down days in the heart of peak season?!? I was toying with the idea of flying back out for Saturday/Sunday/Monday, although it would cost a total of two days of travel from the east coast just for three days of chasing; I can't stay out all of next week and neither can my chase partner. And already, things are shifting unfavorably, as it now looks like Saturday is out of play, so it would be down to two days max. I know it's stupid to be "angry at the weather," but when you love something so much, disappointment will do that to you. I hate feeling ambivalent about chasing but at this point I have to ask myself if a short trip is worth the travel time, expense and trouble. Selfishly, at this point it would be easier to not even have any chasing opportunities that I need to think about.




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Chase vacationers should give the models a couple more days. Some of the ensemble members are more bullish than the op models. While the Euro is off and on, its ensembles have a large minority more bullish than the op. Majority still follow the op, but it could change. Now I hate cherry picking members; I only mention because it is large 35-45% minority I am watching.

When I write more bullish members, I mainly refer to slower and/or farther south 500/200 mb troughs. I am also looking at surface low and/or lee trough placements. While too early to look at the LLJ, I do seek consistent. As we get inside 7 days it is harder to wish-cast a major deepening of the trough. However one can expect op model changes for two or three more days, and of course details will keep changing until the event(s).

If all else fails save that chase vacation for the Great American Eclipse. From what I hear a total solar eclipse will make it all better.
 
Well, I went ahead and took Monday morning off to keep open the option of chasing in the northern or central Plains Sunday evening. Whether I actually go or not remains to be seen. It continues to look darn near gorgeous on the GFS if you just look at the CAPE and surface pattern, but at 500mb things get a lot more iffy. The trough hangs back well to the west and the 500mb southwesterlies are 25-35kt at best over the warm sector. The big question is, do the favorable factors (namely CAPE and low-level directional shear) compensate resulting in slow-moving, easily chaseable supercells, or do you have insufficient mid-level shear and thus disorganized, marginally severe multicells?

Capping also remains a concern although I think it should be breakable at least in some areas. I'd rather have that than too little cap and everything going up at once in a convective mess which we have seen all too often thus far this year. Low-level directional shear, SRH and hodograph critical angles look excellent along the warm front and near the triple point, which is another thing that has been lacking in many setups we've seen this year.

Anyone remember what the 500mb winds and capping looked like on Bowdle day? As I recall, that was a pretty low-key risk setup (slight/5%) that paid off big time. I don't recall 500 mb winds being that strong on Dodge City or Chapman day last year, either.

Monday is pretty much my only option since I'd be a huge jerk asking my coworkers to take extra days or work shorthanded again more than that so soon after what was supposed to be my chasecation, so any potentially better days later in the week are off the table for me until/unless something presents itself locally as the trough ejects toward the upper Midwest toward next Thursday/Friday/Saturday.
 
Well, I went ahead and took Monday morning off to keep open the option of chasing in the northern or central Plains Sunday evening. Whether I actually go or not remains to be seen. It continues to look darn near gorgeous on the GFS if you just look at the CAPE and surface pattern, but at 500mb things get a lot more iffy. The trough hangs back well to the west and the 500mb southwesterlies are 25-35kt at best over the warm sector. The big question is, do the favorable factors (namely CAPE and low-level directional shear) compensate resulting in slow-moving, easily chaseable supercells, or do you have insufficient mid-level shear and thus disorganized, marginally severe multicells?

Capping also remains a concern although I think it should be breakable at least in some areas. I'd rather have that than too little cap and everything going up at once in a convective mess which we have seen all too often thus far this year. Low-level directional shear, SRH and hodograph critical angles look excellent along the warm front and near the triple point, which is another thing that has been lacking in many setups we've seen this year.

Anyone remember what the 500mb winds and capping looked like on Bowdle day? As I recall, that was a pretty low-key risk setup (slight/5%) that paid off big time. I don't recall 500 mb winds being that strong on Dodge City or Chapman day last year, either.

Monday is pretty much my only option since I'd be a huge jerk asking my coworkers to take extra days or work shorthanded again more than that so soon after what was supposed to be my chasecation, so any potentially better days later in the week are off the table for me until/unless something presents itself locally as the trough ejects toward the upper Midwest toward next Thursday/Friday/Saturday.

Per http://www.spc.noaa.gov/exper/archive/event.php?date=20100522
It shows 12z and 00z 500mbs winds at70/60 knots over SD. It was a slight risk but with 10% tornado, and would have been enhanced if it existed back then.
 
I would chase the Dakotas Sunday and Monday from Wisconsin. What is it 5-6 hours out and back? (not including chasing) Last year Kansas festivities were with modest 500/200 flow but good boundaries and LLJ. Friday may be Manitoba and Saturday between waves.

Sunday and Monday shortwaves should eject from the Pac NW trough both days. Surface low is shown in SD but so is the cap. ND is not capped but could be cool sector. Reality is thunderstorms should go near the surface low, whether it is warm front or triple point. Might be HP; might get undercut; or, might be lovely. While maybe not worth the trip from Tennessee, I think it is worth it from Wisconsin.

Tuesday and beyond could stay active, but details are way up in the air. Timing and location is all over the place. However I think Sunday Monday is a Dakotas call. Good luck!

Edit for below: Euro also has Kansas going Tuesday when the wave ejects. Watching...
 
I think we're going to have to take these setups day-by-day - June CAPE isn't something I feel confident writing off despite an iron EML. The GFS has broken out precip down into Kansas on Tuesday when the wave ejects, for what that's worth!
 
I would chase the Dakotas Sunday and Monday from Wisconsin. What is it 5-6 hours out and back? (not including chasing) Last year Kansas festivities were with modest 500/200 flow but good boundaries and LLJ. Friday may be Manitoba and Saturday between waves.

Sunday and Monday shortwaves should eject from the Pac NW trough both days. Surface low is shown in SD but so is the cap. ND is not capped but could be cool sector. Reality is thunderstorms should go near the surface low, whether it is warm front or triple point. Might be HP; might get undercut; or, might be lovely. While maybe not worth the trip from Tennessee, I think it is worth it from Wisconsin.

Tuesday and beyond could stay active, but details are way up in the air. Timing and location is all over the place. However I think Sunday Monday is a Dakotas call. Good luck!

Edit for below: Euro also has Kansas going Tuesday when the wave ejects. Watching...

Ah, but worth the 12 hour drive from Chicago to North Dakota? That's where I am at currently. We don't want to commit to the Dakotas for a maybe play on Sunday and Monday, and then a maybe play in Kansas Tuesday. Probably gonna keep putting off decision making until Saturday.
 
I can understand the bitterness James. If you don't go, how would it feel to have bailed out on the seeing the most photogenic tornado of 2017? We all live with regrets in our life and if you could live with that, staying home with your family would be the best option I believe. It probably won't happen, but if it does, it'd be something you'd have to square up with.
 
I think we're going to have to take these setups day-by-day - June CAPE isn't something I feel confident writing off despite an iron EML. The GFS has broken out precip down into Kansas on Tuesday when the wave ejects, for what that's worth!

Agreed, although it is a matter of degree...the models definitely choke on these cap breaking scenarios--tomorrow is the classic example, 12z 3k NAM had nothing down south, then 18Z breaks out serious twisting updrafts in KS! This is at 12 deg C at H7 however; by Friday it is 17 deg C and everything is pretty much toast ;)
 
I'm becoming more interested in Sunday as a good warm front play looks to be setting up. Recent runs have focused across central Minnesota. Otherwise at least on the GFS the cap remains a big issue in the warm sector as 700mb temps of 14-17C are there especially Saturday through Monday.
For me I feel 14C is the point I give up realistic hope of something happening, but of course I've still chased on those days probably too many times[emoji16]


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