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Feb 12-13 Sleet/Snow/ZR Event


JoshM

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I still feel like the nam is out to lunch here.  I know yall are super stoked in NC, and hell it may be right, but I just don't think it is. 

 

 Agreed. First of all, although it did slow the first wave some and toward the other models, the 18Z NAM is still the most amped with wave #1 and not agreeing with the non-NAM 12Z models. It is so amped with wave #1 that it looks to have not much of anything with wave #2 (like the 12Z NAM did). The 12Z non-NAM model consensus doesn't agree. Secondly, the NAM often does not perform well past 48 hours and is even questionable earlier. I fully expect it to correct toward the Euro and company over the next couple of days. We'll see.

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granted I want everyone in on the action, but it seems all models are wanting to tick south with the heavy precip. So I would like to see a small jog north! but that is some more of a run! To bad it's the NAM. The one we always trash when it don't show what we want.... lol

Don't get me wrong I'll take it right where it's at!

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 Agreed. First of all, although it did slow the first wave some and toward the other models, the 18Z NAM is still the most amped with wave #1 and not agreeing with the non-NAM 12Z models. It is so amped with wave #1 that it looks to have not much of anything with wave #2 (like the 12Z NAM did). The 12Z non-NAM model consensus doesn't agree. Secondly, the NAM often does not perform well past 48 hours and is even questionable earlier. I fully expect it to correct toward the Euro and company over the next couple of days. We'll see.

Very well said.  It just doesn't jive with anything.  GFS and CMC Are a very northern stream heavy model and they don't have it that strong.  I do fully expect the GFS to come close to something like the EURO at some point soon.

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 Agreed. First of all, although it did slow the first wave some and toward the other models, the 18Z NAM is still the most amped with wave #1 and not agreeing with the non-NAM 12Z models. It is so amped with wave #1 that it looks to have not much of anything with wave #2 (like the 12Z NAM did). The 12Z non-NAM model consensus doesn't agree. Secondly, the NAM often does not perform well past 48 hours and is even questionable earlier. I fully expect it to correct toward the Euro and company over the next couple of days. We'll see.

fwiw, wpc are going with a non nam/uk/euro/canadian solution  in their latest snow/ice discussion for day 3.

 

Even though the nam is pretty bad compared to other guidance, it still manages to get some sleet/freezing rain down to around gainesville to elberton sometime around hour 63 to 69..where a half inch liquid falls afterwards.

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Thanks for sharing. The fact that GSP is already making an early call with 3 inches for MBY tells me this is serious business. It's been a long time since I've seen that from them days in advance. 

Very true Burger. This is interesting because they usually wait about 24 hours prior to the event even starting.

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NWS Wilmington:

 

LONG TERM /TUESDAY THROUGH SATURDAY/...

AS OF 3 PM SATURDAY...INCREASING LOW LEVEL WINDS WILL REINFORCE
THE WEDGE AS SHALLOW COOL NORTHEAST WINDS WILL BE OVERRUN BY SW
FLOW ALOFT. THE ACTUAL SFC FRONT WILL BE DRAPED ACROSS THE GULF
COAST WITH INCREASING NE FLOW AT THE SFC OVER THE CAROLINAS ON
TUES REINFORCING THE COOL AIR AT THE SFC WHILE A VERY BROAD TROUGH
ALOFT WILL MAINTAIN A W-SW FLOW ALOFT. THIS ENHANCED LOW LEVEL
FLOW WILL SET THE STAGE FOR WIDESPREAD PCP ACROSS THE CAROLINAS AS
ISENTROPIC LIFT INCREASES THROUGH THE DAY AND A POTENT SHORTWAVE
CROSSES THE AREA. LOOKING ON THE 295K SURFACE THE BEST LIFT WILL
BE DISPLACED SOUTH AND EAST ON WED WITH INCREASED SUBSIDENCE
BEHIND EXITING SHORTWAVE AS HIGH PRESSURE REMAINS WEDGED IN FROM
THE NORTH AT THE SURFACE. THEREFORE EXPECT WED TO IMPROVE BEFORE
ANOTHER SYSTEM WORKS ITS WAY ACROSS THE SOUTHEAST.

THE BIG QUESTION IS WHAT TO EXPECT IN TERMS OF MIXED PCP FOR THE
COASTAL CAROLINAS. GUIDANCE CONTINUES TO SHOW TREND OF COOLER AIR
OVER THE AREA ON TUES. BUFKIT SHOWING GREATER POTENTIAL FOR MIXED
PCP OVER NORTHERN TIER COUNTIES FROM MARLBORO TO NW PENDER
COUNTIES...BUT OUR FORECAST GRIDS KEEP MIXED WITH RAIN TUES AFTN AND
POSSIBLE MIXED AGAIN WED NIGHT. FOR NOW WITH THE STATE OF FLUX AND
INCONSISTENCY IN MODEL GUIDANCE WILL KEEP SOME MIXED BUT WILL NOT
TRY AND BE TOO PRECISE IN TERMS OF PTYPE...EXACT LOCATION AND AMOUNT.

A WAVE OF LOW PRESSURE WILL RIDE UP FROM THE GULF ACROSS THE
SOUTHEAST MID WEEK. THE LATEST GFS SHOWS IT AFFECTING LOCAL AREA WED
NIGHT INTO THURS WITH BEST LIFT AND UPPER LEVEL ENERGY REMAINING
SOUTH OF THE CAPE FEAR REGION INITIALLY. IT WILL MAINLY ACT TO
ENHANCE THE WEDGE/COASTAL TROUGH AND PRODUCE ANOTHER PERIOD OF
INCREASED ISENTROPIC LIFT OVER THE AREA...BUT A NORTHERN STREAM
SYSTEM WILL DIG DOWN FROM THE GREAT LAKES THROUGH LATE THURS. THIS
DEEPENING LOW TO THE NORTH MAY FIRST LIFT THE COASTAL TROUGH/WARM
FRONT NORTH THURSDAY BUT WILL THEN DRAG A COLD FRONT THROUGH THE
COASTAL CAROLINAS FROM THE WEST OVERNIGHT THURS. OVERALL EXPECT COOL
AND UNSETTLED WEATHER WITH PLENTY OF CLOUDS AND INTERMITTENT PCP
FROM TUES THROUGH THURS.

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At least it's consistent... 18z NAM snow totals

 

Kinda scary how similar they are, hopefully its a sign the NAM has it nailed but I think a general 4-8" is more likely but man would it not be nice to see a statewide thump like that, it would cripple the state though everyone is already out of salt and there are not enough snowplows to handle half that much just in the big cities  much less a foot across the entire state lol...

 

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