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Medium-long range thread


tombo82685

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I haven't really changed my thoughts all week, FWIW. I think we still end up in a roller coaster pattern for a while. A few days torch, then a few days of colder weather behind fronts. The presence a Hudson Bay vortex means cold will never be too far away and the HBV is in the ensembles through the middle of March. The strongest cold will be over the N Rockies/N Plains/Great Lakes, but will make periodic intrusions into our area.

I think there will chances for snow in our area, at least enough that we'll be tracking short term models, but they'll most likely end up as rain here.

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I haven't really changed my thoughts all week, FWIW. I think we still end up in a roller coaster pattern for a while. A few days torch, then a few days of colder weather behind fronts. The presence a Hudson Bay vortex means cold will never be too far away and the HBV is in the ensembles through the middle of March. The strongest cold will be over the N Rockies/N Plains/Great Lakes, but will make periodic intrusions into our area.

I think there will chances for snow in our area, at least enough that we'll be tracking short term models, but they'll most likely end up as rain here.

I agree with your thoughts, good to hear a pro on this.

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Honestly, i would take what the gfs shows with a grain of salt. Just 2-3 days ago the gfs had this system as a snowstorm yikes.png

Euro tracked the storm over Buffalo, 24 hours out. It was atrocious with the low placement. End result still sucked but euro did not do a good job yesterday at all.

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With this pattern, a positive NAO along with the block N of AK getting shoved SE into the Yukon creates a strong confluence zone over SE Canada and likely means a cold pattern N of 40N beginning around Mar 7 or so.

GFS and its ensembles still show the NAO staying pretty positive through the extended.

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With this pattern, a positive NAO along with the block N of AK getting shoved SE into the Yukon creates a strong confluence zone over SE Canada and likely means a cold pattern N of 40N beginning around Mar 7 or so.

No one cares about cold if its not going to snow (I certainly don't) ;)

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So the big mountain torque event ended late last week, which means there is nothing to disturb the polar vortex and it should become stable again around Mar 7-10 or so. At the same time, though, the MJO looks to be heading towards Phase 7 around the 10th. On top of that, d(AAM)/dt is crashing through the floor (probably in response to the negative mountain torque), something we haven't seen all season.

If I'm reading the GSDM stuff right (and there's a good probability I'm not, since I'm still new at it), that would mean a cold to very cold 2nd half of March. No idea if that means snow threats or not, but it will mean the end of the roller coaster temperature pattern.

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So the big mountain torque event ended late last week, which means there is nothing to disturb the polar vortex and it should become stable again around Mar 7-10 or so. At the same time, though, the MJO looks to be heading towards Phase 7 around the 10th. On top of that, d(AAM)/dt is crashing through the floor (probably in response to the negative mountain torque), something we haven't seen all season.

If I'm reading the GSDM stuff right (and there's a good probability I'm not, since I'm still new at it), that would mean a cold to very cold 2nd half of March. No idea if that means snow threats or not, but it will mean the end of the roller coaster temperature pattern.

thanks adam.

would love one more winter punch before 100% spring kicks in.

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So the big mountain torque event ended late last week, which means there is nothing to disturb the polar vortex and it should become stable again around Mar 7-10 or so. At the same time, though, the MJO looks to be heading towards Phase 7 around the 10th. On top of that, d(AAM)/dt is crashing through the floor (probably in response to the negative mountain torque), something we haven't seen all season.

If I'm reading the GSDM stuff right (and there's a good probability I'm not, since I'm still new at it), that would mean a cold to very cold 2nd half of March. No idea if that means snow threats or not, but it will mean the end of the roller coaster temperature pattern.

youve been trying to bring cold back now for the past 3 weeks. Hopefully we get one more run

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youve been trying to bring cold back now for the past 3 weeks. Hopefully we get one more run

Not for you, I haven't. I was colder than the models for last week and this week for the GL/NE and I'm going to be right there. I'm on board with the models for the cool down in the 11-15d period.

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So the big mountain torque event ended late last week, which means there is nothing to disturb the polar vortex and it should become stable again around Mar 7-10 or so. At the same time, though, the MJO looks to be heading towards Phase 7 around the 10th. On top of that, d(AAM)/dt is crashing through the floor (probably in response to the negative mountain torque), something we haven't seen all season.

If I'm reading the GSDM stuff right (and there's a good probability I'm not, since I'm still new at it), that would mean a cold to very cold 2nd half of March. No idea if that means snow threats or not, but it will mean the end of the roller coaster temperature pattern.

I think you will need something to get the AAM to spike back up to support cold East after mid month (since it is currently falling hard). The MT spike did its work and combined with energy entrained from the WPAC tropical heating source, will sustain higher heights in AK for awhile and dump some notable cold into the mid continent, but it seems all we can get is some occasional leaking of this into the East. One such time comes focused on this Thursday in NE especially, and then we watch to see what happens later next week into the start of the following week. By then, the effect of the MT spike should have been worked out of the system, and since there isn't any meaningful blocking left, it could warm back up for awhile. I think if we see a new AAM spike and the next round of tropical forcing tries to come east, that would be your clue for a colder pattern but by then we may be into the final 7-10 days of the month.

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I think if we see a new AAM spike and the next round of tropical forcing tries to come east, that would be your clue for a colder pattern but by then we may be into the final 7-10 days of the month.

Yeah, I am not so good with the GWO yet. I'm trying to track the stages in the GSDM for the potential for an AAM spike, which looks like in the 15-20d time frame?

I assume you're not buying into the P7 signal in the MJO for mid-month?

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Yeah, I am not so good with the GWO yet. I'm trying to track the stages in the GSDM for the potential for an AAM spike, which looks like in the 15-20d time frame?

I assume you're not buying into the P7 signal in the MJO for mid-month?

I'm not buying it yet. In fact the current pattern, thanks to the MT spike, may be closer to a true p7 look even though the OLR anomalies aren't a great fit to that phase. I wouldn't rule out another bump up in AAM down the road. I'm just leaning with a slower idea as far as impact in the U.S.

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