Future of the Season Pt 3

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Call it wishcasting, but I'm feeling much more comfortable about the weather situation a week before I leave, than I was at this time last year. I dont see a death ridge or omega block, so I'm happy. Be nice if neither would develop the 4 weeks I'm out there :D
 
I do like the trend with the 18z run. Looks like from Monday 20th on there is a decent change in the pattern.
http://www.nco.ncep.noaa.gov/pmb/nwprod/analysis/namer/gfs/18/images/gfs_500_204s.gif

In addition as Jim points out the ECMWF shows this as well for that week.
http://www.ecmwf.int/products/forec...merica!pop!od!oper!public_plots!2007051112!!/

Finally the spaghetti maps are also showing that trend (where it was showing the death ridge run after run).
http://www.emc.ncep.noaa.gov/gmb/ens/fcsts/ensframe.html

So things are trending in the right direction... until the next run that is.
 
Well, I can tell you that watching the 12Z GFS come in this afternoon in the office in London, the 3 of us coming over on Monday were rather more interested in that run than the last few. The 18Z continues the interest, and the 12z ECMWF (as has already been mentioned) is beginning to jump on the bandwagon. I reckon 20th onwards looks pretty good for severe storms, and a growing risk of another widespread event.
Just a decent supercell would do me, as one of our team, Rob, is coming over for his first US trip, and I would love for him to see the Plains with a mothership hovering overhead! Although I love to see the storms myself, there is nothing like watching someone else's reaction to their 1st Great Plains supercell!
 
Call it wishcasting, but I'm feeling much more comfortable about the weather situation a week before I leave, than I was at this time last year. I dont see a death ridge or omega block, so I'm happy. Be nice if neither would develop the 4 weeks I'm out there :D

Ditto. This is best I felt a week prior to departure since 2004 when I vacation chased the Hallam tornado outbreak..I suspect this vacation when even be better..especially further North. I am going to go out on limb and say that the death ridge naysayers are going to be wrong. :D
 
One thing models are insistent on is some potential shortwave action that will be imbedded an a weak flow pattern. This may be just enough to preclude the first possible date of the picnic (19May, 1pm).

LOL, looks like the worst-case scenario is creeping up yet again....a marginal chase op that cancels the big bash but really isn't a huge deal....but tours and vacationers will no doubt jump on anything convective during their stints on the Plains. Seems like in the good old days we either chased tornadoes or had a party....nowadays a slight 2% tornado in SD usually ruins the fun. My last weekend in Norman is the weekend of the 19th, so hopefully the party happens then.
 
I wish i could just stop looking at the stinkin model runs, cause theyre gonna keep me on a roller coaster until the day my chasing begins (was gonna be the 17th, but will probably save the gas and push that back). Sure hope the 18z gfs pans out, though that seems highly unlikely. I am encouraged by the persistent shortwave that will come through early next week tho, i certainly dont mind chasing in the Dakotas or Iowa--sounds good to me!
 
0Z run looks better, the best 0Z run I have seen since I started obsessing over this pattern. Still has the nice wave coming into the Dakotas and possibly affecting the midwest early next week, or late weekend. Then it tries digging in a much deeper trough after that around the 25th or so. Hope that verifies... but we have a ton of time to wait and see. Til then I'll play with some linear mess on the cold front.

EDIT: If it means anything to anyone, the 18Z GFS and ECMWF are identical with their placement of the trough, and bring it surging through the central plains. The 18z run then brings three strong troughs in one right after another. Not that I'm counting on that actually happening. It actually seems the 18z run is usually the most inaccurate, but I guess this time we can hope for a change in that pattern.
 
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The flow gets nice over the far northern Plains for a couple of days late next week (MT and ND) but the cold front is pushing good moisture far to the south, leaving little to work with up there.

The trough at the end of the month has been fairly consistent.
 
Front timing and southern extent/speed will be difficult to forecast next week -- maybe day by day. PM precipt can drive fronts rapidly south. NCEP is picking up on return SW flow around the 25th as noted by others -- although I'm guessing future model runs will (+/-) it a day or so. It's been my experience over the last 20 years that dynamic seasons generally remain so. (1995). I'm guessing one or two more major SW flow events before the middle of June. Even with NW flow (ridge) events, I've learned to stay put in the Panhandles if the DP's are present because NW flow can produce some of the most photogenic storm/tornado images. I was once told that the only true "death ridge" is a "sprawling large upper level high pressure strength of at least 594dkm centered smack dab over northern Texas, 700 mb temps of at least 14C, and 500 mb temps of warmer than -5C. This will end all attempts at tstms for days on end across the central and southern plains states." Anything less has a twinkle of isolated possibilites.

Warren
 
Good points Warren...this is the time of year when a 30 kt. nw flow setup produces nice picturesque tornadic supercells along the High Plains. It's always great to see the major 50+ kt. deep shear systems show up on the models, but if you can get that excellent upslope LL flow matched up with nw flow...the results can be very rewarding. Looks to me like there is quite a bit of wind energy loaded across the Pacific (GFS trends) set to bring chasers a treat in early and possibly mid June. Just need to have the blocky ridge over the east to shove a touch eastward and allow the systems to move in and lift nicely across the Plains and Mississippi Valley. Hope the road shoulder capacities can withstand the masses :rolleyes:
 
Per the Saturday (5-12) discussion by DDC:

ANOTHER UPPER TROUGH WILL DEVELOP IN THE WESTERN US BY MAY 21-23.
THE DETAILS OF THIS ARE UNCLEAR. LOW LEVEL MOISTURE SHOULD BE
IN PLACE AND THUNDERSTORM CHANCES SHOULD BE IMPROVING. DEPENDING ON THE EVOLUTION OF THE UPPER LEVEL FLOW, SEVERE STORMS COULD BE POSSIBLE DURING THE LAST 10 DAYS OF MAY IF THAT UPPER TROUGH DEVELOPS AND STAYS FOR SEVERAL DAYS.
 
Mark my words... there will be a massive supercallafragilisticexpealladocius severe weather outbreak on Sunday, May 27th. How do I know this? Because I'll be shooting a wedding anniversary at 12:30 that afternoon in Brush, Colorado.:mad:
The timing is awful, as Memorial Day weekend always seems to feature some sort of major severe weather event in the Central Plains, but then again, it's only a half hour commitment and after developing costs it's something like $130 in my pocket for an easy half hour's work:cool: ... as well as more than enough to pay for gas/food for one big chase (I have a goood feeling about some Panhandle Magic in early June) or several smaller, local chases in my classic Tri-State(eastern CO/western NE/northwestern KS) stomping ground.
I'm really hoping the big action will stay in my "backyard" as it be, as with gas prices seemingly heading north to Alaska, I, like many chasers, just won't be able to afford multiple 1000+ mile chase trips. That prolly sounds more than a little selfish, but hey: the Southern Plains have had a lion's share of sweet severe weather thus far this season, and the majority of the chasers who live out there have had multiple, magnificent tornado days; it's time for us Central Plains dwellers to cash in on the action(3/28 being a significant exception). *end of personal rant*

Forecast wise, I think we may start to see a return to a more severe wx favorable pattern around the 20th, and with all the wads of spare cash I have lying around, I'd put money on a massive outbreak around or during Memorial Day weekend and at least one awesome day of Panhandle Magic the first week of June. After that, the High Plains will be the place to be for the remainder of the chase season, with a possible significant Northern Plains event sometime in mid to late June ( a la 6/23/04).
Call it wishcasting, call it dreaming, but I have a feeling Colorado may have its first major tornado day since May 17, 2000 in late May or early June. With the abundant precip we've had this spring, everything is green around here, and I mean EVERYTHING. The evapotranspiration from all this greenery is definitely going to boost dp's around here. Frankly, I expect we will see *gasp* dp's reach the lower 60's across parts of eastern CO on days where we have favorable easterly or southeasterly flow! This kind of juice is extremely rare in this semi-arid climate!
Time after time, as any who has chased in this fair state will tell you, many a potential western High Plains tornado outbreak has been spoiled by lack of deep moisture. These tornado setups can be likened to a slightly botched multi-berry smoothie: the various 'berries' (dynamics, wind shear, surface boundaries, etc) are there, but it seems there isn't ever enough ice ( moisture) and the result is palatable, but rarely delicious.
But if enough "ice" is added to the mix, the smoothie suddenly becomes a spectacular treat. It seems for the first time in many years, all the ingredients will be in place, and I believe that this is what we're going to get in the western High Plains between the end of May and the end of June: a spectacular treat.
I join my fellow 'watchers and waiters' with high hopes and baited breath...
 
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My, how things have changed.

Tonite's run shows a pretty active week starting at the end of next weekend anywhere from the central and northern plains east into the great lakes and midwest. Then later towards Memorial Day it shows a major trough digging in. This is all pointless to get worked up over yet, but it's worth noting that the model runs have gotten better each day. Sometimes I wish I could freeze the models and have things happen exactly how they show things happening on a given run. With as bad as the forecast has looked before now, I kind of wish I could freeze this run before it kills our hopes and keeps the ridge instead.
 
The 00Z runs look awefully good, and i'm quite optimistic. As Warren mentioned, it's hard to keep a good season down! Just look at that lovely low carving a huge chunk of real estate over the N Pacific, and all that tropical convection further to the SE. I sense happy times for chasers ahead!
 
Guys, I think everybody is just worried about this season just now starting to wind down. Why wouldnt anyone start to think this after the past two years of crappy chases. However this year has been my best yet. As warren has mentioned a good year like this just doesnt die down and quit. May isnt over and models can change overnight. Just give it a couple days to a week and I'll bet we will see a nice trough comming in from the west. I think from the 18th all the way through the end of may is going to be a very stormy and active severe weather pattern for much of the plains states. In my opinion this season still has a lot to show us chasers. Hopefully not another greensburg Kansas tornado but it is May, it has been and more than likely will stay an active season. Guys mark my words May has just started for us.
 
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