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February 16th-17th Potential Winter Storm


Powerball

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IWX...

http://forecast.weather.gov/product.php?site=NWS&issuedby=IWX&product=AFD&format=CI&version=1&glossary=1

PCPN TYPE IS STILL SOMETHING TO BE WATCHED THROUGH THIS EVENT AS

THERMAL PROFILES ALOFT SUPPORT LARGE DENDRITE FORMATION. MODEL

SOUNDINGS ALL IN GOOD AGREEMENT WITH A 3C TO 5C WARM NOSE IN THE 900

TO 950MB LAYER WHICH SHOULD MELT MOST PCPN. HOWEVER...GIVEN STRONG

LIFT AND DYNAMICAL COOLING PROCESSES ALONG WITH OVERNIGHT

TIMING...HAVE CONCERNS THAT WET SNOW POSSIBLE IN FAR NORTHWEST WITH

MORE COOLING THAN IS BEING ADVERTISED BY ANY MODEL. THIS WILL NEED

TO BE WATCHED CLOSELY AND DYNAMIC COOLING ALWAYS DIFFICULT TO

DETERMINE BEYOND NEAR TERM PERIODS. NEIGHBORS TO WEST AND NORTH IN

DEEPER COLD AIR REMAIN ALL RAIN SO WILL HOLD STEADY FOR NOW BUT

WATCH THERMAL FIELDS CLOSELY NEXT FEW RUNS.

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18Z Nam "follows" the Euro by being wetter. Nice...

Also nice little excerpt from South Bend AFD..

PCPN TYPE IS STILL SOMETHING TO BE WATCHED THROUGH THIS EVENT AS

THERMAL PROFILES ALOFT SUPPORT LARGE DENDRITE FORMATION. MODEL

SOUNDINGS ALL IN GOOD AGREEMENT WITH A 3C TO 5C WARM NOSE IN THE 900

TO 950MB LAYER WHICH SHOULD MELT MOST PCPN. HOWEVER...GIVEN STRONG

LIFT AND DYNAMICAL COOLING PROCESSES ALONG WITH OVERNIGHT

TIMING...HAVE CONCERNS THAT WET SNOW POSSIBLE IN FAR NORTHWEST WITH

MORE COOLING THAN IS BEING ADVERTISED BY ANY MODEL. THIS WILL NEED

TO BE WATCHED CLOSELY AND DYNAMIC COOLING ALWAYS DIFFICULT TO

DETERMINE BEYOND NEAR TERM PERIODS. NEIGHBORS TO WEST AND NORTH IN

DEEPER COLD AIR REMAIN ALL RAIN SO WILL HOLD STEADY FOR NOW BUT

WATCH THERMAL FIELDS CLOSELY NEXT FEW RUNS.

nam_namer_039_1000_500_thick.gif

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Lol, good one!

Seems like the northern stream energy gets more involved this run.

Yes it is quite a bit stronger but again lets see if the other 0z model guidance has a similar solution.

I like the storm after this. If you look at 84 hours (500mb vort maps) you'd notice a cut off with decent vort energy across the S/W with another decent energy wave across the PNW and a weak trough across the region reminisce of the last storm.

Whether that can possibly become the first decent negatively tilted storm of the year remains unknown but IMO that has alot of potential. Lets hope it can phase with that energy wave across the PNW.

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Yes it is quite a bit stronger but again lets see if the other 0z model guidance has a similar solution.

I like the storm after this. If you look at 84 hours (500mb vort maps) you'd notice a cut off with decent vort energy across the S/W with another decent energy wave across the PNW and a weak trough across the region reminisce of the last storm.

Whether that can possibly become the first decent negatively tilted storm of the year remains unknown but IMO that has alot of potential. Lets hope it can phase with that energy wave across the PNW.

Yeah, I see what you mean @ 84hours. That would likely be a Monday event about.

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Yes it is quite a bit stronger but again lets see if the other 0z model guidance has a similar solution.

I like the storm after this. If you look at 84 hours (500mb vort maps) you'd notice a cut off with decent vort energy across the S/W with another decent energy wave across the PNW and a weak trough across the region reminisce of the last storm.

Whether that can possibly become the first decent negatively tilted storm of the year remains unknown but IMO that has alot of potential. Lets hope it can phase with that energy wave across the PNW.

Yeah, NAM would be interesting beyond 84 hours. It slows down the southern stream much more so than other OP models, which might give it a chance to phase with that s/w over BC. 18z GEFS yesterday also had a similar look. Haven't seen any other model indicate the same potential though.

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i was going to do an ECMWF QPF list since we're inside 24hrs, but it's not even worth it...just look at the GFS.

Barring a miracle, looks like a substantial failure for the Euro at < 48 hours. Don't see that very often, but I guess it being out on a limb was a sign to take its prior solution with extreme caution.

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