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Potential major winter storm - Feb 24-27


snowstormcanuck

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GRR's thoughts:

 

 

THE BIG NEWS IN THE EXTENDED PERIOD CONTINUES TO BE THE INCREASING
CHANCES OF A SIGNIFICANT SNOWSTORM ACROSS CENTRAL AND EASTERN LOWER
MICHIGAN WEDNESDAY AND WEDNESDAY NIGHT.

THE 00Z MODEL GUIDANCE REMAINS IN DECENT AGREEMENT THAT SOUTHERN
PLAINS CYCLOGENESIS WILL OCCUR AND THE LOW WILL TRACK CLOSE ENOUGH
TO BRING SNOW TO LOWER MICHIGAN. IN FACT...BOTH THE ECMWF AND GFS
SHOW A CLASSIC CLIMATOLOGICAL TRACK FOR WARNING CRITERIA SNOW TO
IMPACT AT LEAST THE EASTERN HALF OF THE FORECAST AREA. GIVEN THIS WE
HAVE BUMPED UP POPS TO LIKELY ACROSS THE SOUTHEAST FORECAST AREA ON
WEDNESDAY AND WEDNESDAY NIGHT IN LINE WITH THE TRACK SHOWN BY THE
00Z ECMWF. THE GFS TRACK HAS BEEN A BIT FURTHER WEST AND WOULD BRING
HEAVY SNOW TO THE ENTIRE FORECAST AREA.
 
IWX's thoughts:
 
STRONG PACIFIC JET ENERGY WILL CARVE OUT A DEEP TROUGH/PV ANOMALY
OVER THE SOUTHERN PLAINS BY TUESDAY. THIS ENERGY WILL THEN PHASE
WITH NORTHERN STREAM WAVE DIVING SOUTHEAST AND SPAWN STRONG SURFACE
CYCLOGENESIS SOMEWHERE OVER THE EASTERN CONUS BY WED/THURS.
COUPLED UPPER JETS AND PHASED/NEGATIVELY TILTED LONGWAVE TROUGH
WITH AMPLE MOISTURE AND DIFFLUENCE ALOFT FAVOR A STRONG SURFACE
LOW AND LARGE AREA OF MOD-HEAVY PRECIP. MAJORITY OF LATEST
DETERMINISTIC AND ENSEMBLE GUIDANCE FAVOR THIS SCENARIO BUT VARY
WILDLY IN EXACT SURFACE LOW TIMING AND TRACK. THIS IS UNFORTUNATE
NOT ONLY BECAUSE PRECIP SHIELD COULD LARGELY MISS US WITH AN
EASTERLY TRACK (SEE 00Z NAM AND GEM)...BUT A FURTHER WEST TRACK
(GFS) WOULD ALLOW WARMER AIR TO AT LEAST PARTIALLY INFILTRATE OUR
AREA AND INTRODUCE PRECIP TYPE ISSUES. OBVIOUSLY A LOT OF DETAILS
TO WORK OUT AND CONFIDENCE IN ANY ONE SOLUTION REMAINS LOW AT THIS
TIME RANGE. DID HOWEVER RAISE POPS FOR WED AND INTRODUCE POPS FOR
TUESDAY NIGHT GIVEN POTENTIAL EARLY ARRIVAL OF WAA WING AS SEEN IN
NEWEST NAM AND GFS. WILL CONTINUE TO WATCH THIS PERIOD VERY
CLOSELY AS POTENTIAL FOR AT LEAST PARTS OF OUR AREA TO SEE SOME
SNOW IS INCREASING. COOLER TEMPS AND SOME LIGHT LAKE EFFECT SNOW
POSSIBLE HEADING INTO THE END OF THE WEEK.
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Have to say I'm not liking the trends. I'm starting to think this could be snow to rain scenario for Toronto. There just isn't enough cold air around.

 

Probably more like rain to snow. Somewhat presciently, I mentioned on page 1 or 2 that the eastern lakes don't cash in on bombs. This will be no exception.

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going to break a lot of Ohio posters hearts and break the board entirely with that post 

 

?  I think Ohio posters have been pretty realistic about this one....haven't seen any weenie optimism from any of us.   You have to have a modeled snow storm before you can have your heart broken.   Even when the models were east with the perfect track, they weren't giving us a snowstorm.  

 

No cold HP to our north means if the storm is weak and east, no cold air.  If it's amped, it's warm air.    We were damned if we did, damned if we didn't.   I'm just riding the potential backlash train....which will derail if this keeps heading west.   

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Our only hope for this scenario is if it bombs out overhead or just west of us. Otherwise :underthewx:

 

yep.  The 00z euro op/control/and eps all show decent wrap around for most of Ohio.....   but I don't think the west trend is over.   This has the earmarks of one of those storms that once the models figure out it's going to phase, it becomes katy-bar-the-western-door.  

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