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Mid FEB through March Threats/Snow Storms


mitchnick

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starting which week in March?

Heights and 850s give way week 2 tho it keeps cool sfc thru week 3. Seems suspect this far south on that but maybe. It's more or less held to Mar 1ish tho maybe it's dragging a bit which might not be good news. However given expected PNA relax we should ease at least.
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Heights and 850s give way week 2 tho it keeps cool sfc thru week 3. Seems suspect this far south on that but maybe. It's more or less held to Mar 1ish tho maybe it's dragging a bit which might not be good news. However given expected PNA relax we should ease at least.

Snow depth?    :weenie:  :weenie:  :weenie:     lol

 

Thx

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Snow depth? :weenie::weenie::weenie: lol

Thx

Could be .. That was HM's guess too. Not sure that's a huge factor this far south but maybe. They hadnt hit wxbell yet so only saw week avgs. May be wrong but it's consistently highlighted the beginning of mo or so for a while. CFS sub weeklies have a hint of brief warming before turning cold again mid mo or so.
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Heights and 850s give way week 2 tho it keeps cool sfc thru week 3. Seems suspect this far south on that but maybe. It's more or less held to Mar 1ish tho maybe it's dragging a bit which might not be good news. However given expected PNA relax we should ease at least.

 

Interesting.  There's been some consensus in the models (in the longer range) of the amplified flow relaxing.  Whether that's temporary and we go back again sometime later in March, who knows.  Now, when you say "warmer" in the weeklies, I take it that's relative to what we've been experiencing?  I mean, doesn't necessarily mean 60s and 70s as we get into March or something.  Just looking at the GEFS mean pattern, I can see us remaining well below normal through the end of February, perhaps into the first couple days of March.  Then if you "extrapolate" the flow, maybe normal or slightly below.  Which is warmer than what we had and certainly not a snow-looking pattern, but hardly all that mild.  This is all speculation of course, remains to be seen.  The only thing I think that there's any real confidence in is through the end of next week (end of February).

 

(ETA:  Normals are getting into the low-mid 50s for highs and 30s for lows, in early March, at DCA.  Also interestingly, CPC's 0.5 month lead for March calls for below normal temps in the northeast quarter of the U.S., for what it's worth.)

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I always considered it a straight miller A.....no redevelopment...one primary low up the coast....doesn't matter that it was northern stream...

It was kind of messy before 12Z on 1/7/96 with inverted trough extending into Kentucky. The low redeveloped off of NC with the GA low (and accompanying low pressure into WV by then) dissipating soon after. I think it was a hybrid of sorts but still overall, a gulf to east coast track.

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This miller a vs b discission is interesting because technically every low redevelops. Lows done move as much as they continuously redevelop and jump to where the pressure falls are occurring usually along a baroclinic boundary. Of course some lows redevelop along a more continuous track and some have to jump a long way to a new boundary when forcing or the thermal gradient forces it to.

If simply having a low pressure jump of more then 100 miles or something like that is the criteria then 80% of storms are miller b but I would really throw them into 4 categories.

The straight miller a gulf storms. Travel a consistent track up the coast east of the mountains. Those are our holy grails but rare.

Southern stream dominated miller b hybrid. Storm from gulf tracks west of the apps into tn ky initially then redevelops off the coast. If there is cold air in place and the transfer happens below our latitude we can get crushed by those.

Northern stream/southern stream phase miller bs. Northern stream system digs as a southern low comes up and they phase. These are more iffy. If the northern stream digs below our latitude and there is blocking we do ok. Without blocking it's unlikely it comes together in time. Also if the phase happens late like Boxing Day it won't work. But we have had good storms from this type also.

Finally northern stream only miller b. Clipper low bombs. These almost never work for us

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Been working all morning and haven't had a chance to look at anything for next week. How is the midweek system looking.

So far the PV anvil is squashing everything. I'm skeptical of such a suppressed look. Doesn't mean we get hit or anything. Just that the door will open a bit after the hp early next week moves around a bit. Something could sneak up here from thurs-sun timeframe. Impossible to know right now.

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So far the PV anvil is squashing everything. I'm skeptical of such a suppressed look. Doesn't mean we get hit or anything. Just that the door will open a bit after the hp early next week moves around a bit. Something could sneak up here from thurs-sun timeframe. Impossible to know right now.

Thanks. Another very cold week looks almost certain. Would love to sneak in one more anomoly of cold powder late in the season.
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