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June 9-11 Severe/Heavy Rain Threats


Hoosier

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Continues to look like a local chase on Thursday. Love these setups with a NW-SE oriented boundary with NW flow aloft, great directional shear and slow moving storms. Seems like we get these a few times a summer 

 

 

I'd like to have stronger flow in general but I suppose it could work.

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Couldn't agree more. The perfect amount of shear to keep things isolated and slow moving. These kind of events always tend to over perform in the IL/IW/IA area so I will 100% be taking a gamble on it.

 

Continues to look like a local chase on Thursday. Love these setups with a NW-SE oriented boundary with NW flow aloft, great directional shear and slow moving storms. Seems like we get these a few times a summer 

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Couldn't agree more. The perfect amount of shear to keep things isolated and slow moving. These kind of events always tend to over perform in the IL/IW/IA area so I will 100% be taking a gamble on it.

I always feels like Iowa busts :( , there probably isn't any statistical backing of that, but I still feel that way. 

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Should see an MCS of some sorts across the N MN into the Great Lakes Friday night with some weak Pacific energy riding a top the ridge and that potent shortwave dropping through Ontario. Likely right turning too (possibly hard right) with instability axis over S MN into WI.

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Sweet, gives me enough time to finish work, eat supper, and take a leisurely drive north a county or two and bag.

In all seriousness a pretty interesting (conditional) NW flow setup.

The sub relies on you for severe weather capping porn cyclone lol. Your lapse videos are incredible dude.

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Should see an MCS of some sorts across the N MN into the Great Lakes Friday night with some weak Pacific energy riding a top the ridge and that potent shortwave dropping through Ontario. Likely right turning too (possibly hard right) with instability axis over S MN into WI.

That possibility doesn't look all that great to me around here, but I'm just hoping for one severe element. Hail, wind, whatever. It's been an incredibly slow start to the severe season here.

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The 4km NAM doesn't want to convect until late Thursday evening, but the setup still holds some potential given the shear/instability overlay. I'm planning to chase both Thursday and Saturday up in the region. Should be fun to have chase opportunities away from the Plains, as there won't be excessive chaser convergence.

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That possibility doesn't look all that great to me around here, but I'm just hoping for one severe element. Hail, wind, whatever. It's been an incredibly slow start to the severe season here.

 

Yup, not sold on anything for the TC but the potential looks a lot better than a couple days ago.

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I'm getting a bit excited about this Friday and Saturday. SPC and Forbes have Saturday's event staying just to my northeast, but I feel I'm in a good position due to how far out we are and how unpredictable MCS's are. I don't think I'd be feeling good if I was in the bullseye for Saturday's event right now.

 

ILN had a good writeup. Stoked some optimism for me.

 

On Saturday, primarily dry conditions are expected during the
morning hours. Winds pick up during the day on Saturday and expect
a decent amount of sunshine especially across the south. Have
temperatures climbing into the upper 80s to low 90s across the
region. The cooler temperatures are across northern and eastern
portions of the forecast area where expect thunderstorm development
earlier in the afternoon. There is some model uncertainty on where
thunderstorm development will be Saturday afternoon and into the
evening hours. Have some concern that some of the models that have
the current placement further east are a little too displaced and
that the system will make a little more of a right turn and move
into the higher
instability area across the forecast area.
CIPS
analogs show a pattern consistent for the potential for severe
weather across the region. If thunderstorm development does develop
and move into the area Saturday afternoon and evening there will be
the potential for severe weather. Damaging winds will be the
primarily threat. SPC already has the northeast portions of the
region in a risk for Saturday and believe at this time the northeast
across central Ohio does have a greater severe threat. Increased
precipitation chances during this time, however for collaboration
purposes and with some uncertainty still, decided to limit
precipitation chances to the higher chance category.

 


 
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I've had some really bad luck with storms this year. Almost everything has either missed or split me. The last good storm that even had some decent lightning in it was on Christmas Eve, of all times. So, I'm definitely hoping I at least get something decent this weekend.

 

I'd imagine more of an MCS setup is likely, but GFS is showing a non-zero tornado threat in central Ohio late Saturday. Definitely will be watching how this evolves.

 

gfs_2016060718_102_KCMH.png

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Cautiously optimistic about my chances here. NAM solution (lol) would look relatively good for Saturday afternoon. MCS potential the days beforehand also looks pretty good. 

 

Of course, we'll probably see debris and ruined potential like always. 

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I am trying to chase either Thursday in IL or Saturday in OH or IN. Pros or cons to both days. For Thursday, I'm already scheduled to have the day off...for Saturday, I need to decide by about 2PM Wednesday whether or not I want to request the day off. For Saturday, yes the speed shear looks stronger over OH than over IL on Thursday, but it looks like we'll have to contend with some sort of MCS, and that immediately gives me pause. If we had a strong LLJ to facilitate rapid recovery and eye-popping hodos behind the MCS I wouldn't care about it (such as 7/13/15 and perhaps a better example 6/22/15...though I didn't chase 6/22), but we don't so the MCS potential gives me pause...and I don't want to request off work for a setup that I'm just luke-warm on (at best). I also don't like the jet streak arriving very late on Saturday. If the MCS wasn't an issue, I wouldn't be worried and would trust the front to fire convection on its own as there doesn't look to be a ton of capping. There is some disagreement for Saturday as well, with the Euro and Canadian keeping the better shear farther northeast. 

 

For Thursday, I feel confident in moderate to strong instability building over IL. Bulk speed shear looks weaker but still sufficient at 35-40 knots, and low level turning looks good on the GFS and NAM. There isn't a strong upper level forcing mechanism moving in on Thursday, but there isn't a ton of CINH on forecast soundings, so isolated to widely scattered convection seems likely to develop by 0z in IL. Given the lack of stronger forcing, discrete supercells may be the preferred storm mode for a few hours, with enough low level shear and favorable LCLs for tornadoes. Because I already have Thursday off, I'm leaning towards chancing that, assuming the threat continues to look OK in IL. I don't see this being a high-end threat, but maybe a day where there are a couple or few supercells with a couple tornadoes, before things maybe grow into a bit of an MCS by late evening.

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New day 2 outlook still has a marginal risk.

A tiny bit surprised.

Anyways, I just looked at the 0Z in depth and noticed an okay chance for some Severe storms Friday during the day, as well as the fact instability ticked up up north in a more southeasterly pattern, and assuming the MCS rides the instability axis we could see some dramatic shifts on where the MCS is progged to go the next few runs.

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New day 2 outlook still has a marginal risk.

Seems reasonable. Not much ascent, so storm coverage is questionable. But I have to think if a couple storms go they could be nice. Wonder if a lake breeze running into the WF may provide enough focus just south of Chicago.
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GFS shifted the t-storm activity slightly farther north.

Probably means it is a lock for this area.

 

gfs_apcpn_ncus_14.png

 

 

back south

 

these subtle shortwaves are hard to pick up at range and always end up reinforcing the boundary further south, so i'd hedge on it being even further south than this

 

gfs_apcpn_us_20.png

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