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Blizzard of 2016 - Official Obs Thread


mackerel_sky

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.NEAR TERM /EARLY TONIGHT/...

AS OF 1045 PM THURSDAY...

TEMPERATURES THIS EVENING HAVE RADIATIONALLY-COOLED INTO THE MIDDLE

20S TO LOWER 30S ALREADY...BENEATH A CLEAR SKY THAT HAS JUST IN THE

PAST HOUR OR TWO FILLED WITH MULTI-LAYERED CLOUDS (~3000/12000/25000

FT) OVER THE SOUTHERN NC PIEDMONT. HOURLY TEMPERATURES HAVE BEEN

ADJUSTED TO ACCOUNT FOR THIS TREND...WITH THIS TREND CARRYING INTO

THE DAY ON FRIDAY BASED ON THE LATEST NWP GUIDANCE...AND WHICH

CONSEQUENTLY HOLDS SURFACE TEMPERATURES AT OR BELOW FREEZING -WITH

WINTRY PRECIPITATION- FOR A FEW HOURS LONGER THAN PREVIOUSLY

FORECAST ON THE SOUTHEASTERN FRINGE OF THE WARNING/ADVISORY AREAS.

IN ADDITION...BUFR SOUNDING AND PARTIAL THICKNESS DATA FROM THE

RAP/GFS/NAM...INCLUDING THE 00Z RUN OF THE LATTER...WOULD SUGGEST

SLEET MAY BE A PREDOMINATE PRECIPITATION TYPE FOR SEVERAL HOURS ON

FRIDAY...WHICH WOULD REDUCE BOTH FROZEN (SNOW AND SLEET) AND

FREEZING RAIN ACCUMULATION FOR THE EVENT...WITH THE LATTER LESSENING

THE IMPACT OF OTHERWISE CRIPPLING FREEZING RAIN ACCRUAL. WOULD LIKE

TO SEE THE FULL SUITE OF THE 00Z MODEL GUIDANCE BEFORE MAKING TOO

DRASTIC OF CHANGES TO THOSE ACCUMULATIONS...HOWEVER.

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.NEAR TERM /EARLY TONIGHT/... AS OF 1045 PM THURSDAY...TEMPERATURES THIS EVENING HAVE RADIATIONALLY-COOLED INTO THE MIDDLE20S TO LOWER 30S ALREADY...BENEATH A CLEAR SKY THAT HAS JUST IN THEPAST HOUR OR TWO FILLED WITH MULTI-LAYERED CLOUDS (~3000/12000/25000FT) OVER THE SOUTHERN NC PIEDMONT. HOURLY TEMPERATURES HAVE BEENADJUSTED TO ACCOUNT FOR THIS TREND...WITH THIS TREND CARRYING INTOTHE DAY ON FRIDAY BASED ON THE LATEST NWP GUIDANCE...AND WHICHCONSEQUENTLY HOLDS SURFACE TEMPERATURES AT OR BELOW FREEZING -WITHWINTRY PRECIPITATION- FOR A FEW HOURS LONGER THAN PREVIOUSLYFORECAST ON THE SOUTHEASTERN FRINGE OF THE WARNING/ADVISORY AREAS.IN ADDITION...BUFR SOUNDING AND PARTIAL THICKNESS DATA FROM THERAP/GFS/NAM...INCLUDING THE 00Z RUN OF THE LATTER...WOULD SUGGESTSLEET MAY BE A PREDOMINATE PRECIPITATION TYPE FOR SEVERAL HOURS ONFRIDAY...WHICH WOULD REDUCE BOTH FROZEN (SNOW AND SLEET) ANDFREEZING RAIN ACCUMULATION FOR THE EVENT...WITH THE LATTER LESSENINGTHE IMPACT OF OTHERWISE CRIPPLING FREEZING RAIN ACCRUAL. WOULD LIKETO SEE THE FULL SUITE OF THE 00Z MODEL GUIDANCE BEFORE MAKING TOODRASTIC OF CHANGES TO THOSE ACCUMULATIONS...HOWEVER. 

Which office issued this?

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CAD does not seem as strong as progged.

Anyone know the the current pressure of the parent high? We have talked at length about whether or not the 1024-1028 that was forecast would be strong enough or not. If it it is even weaker then this is going to bust for a whole lot of people. Interested to see what happens with Asheville' seems to have a HUGE bust potential since they don't benefit as much from CAD. 

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Crazy last hr here in eastern NC at PGV as the clouds come and go, temp crashed to 23 then bounced to 30 but DP continues to lower

 

 

21 23:35 NE 6 10.00 Fair CLR 30 21     69% 24 NA 30.29 NA      

21 23:15 NE 5 10.00 Fair CLR 23 21     93% 17 NA 30.29 NA      

21 22:55 Calm 10.00 Fair CLR 27 23     86% NA NA 30.30 NA

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If the wedge isn't as strong as modeled, the warm nose is going to kill a lot of people, especially if the lp center is stronger than progged. Enjoy the initial thump of snow because you may not get any again once you change over until the backside arrives.

 

Btw, my area has been under heavy rain for the last 2 hours....I can't imagine if these types of bands go over areas where the column is cold enough for snow.....VERY heavy snow....probably rates of 2 inches an hour or more.

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Worried abut the moderate rain here in AVL, wet bulb already reached, models are already too cold. It will change to snow at some point tonight but every hour it rains we will get less snow.....

 

Agree this is not a good sign... a recent radiosonde launch by UNCA ATMS department shows that the models are not doing a good job with the initial warm nose at 850hPa... dynamical cooling will kick in as the rates increase, but seems like models thus far have overestimated CAD cooling prior to precip arrival.

 

0400 UTC sounding at UNCA

 

sempe1516_iop1_snd01.png

 

Representative 0400 UTC NCAR ensemble sounding... clear they are underestimating warm nose at 850hPa thus far by 2-3C... not good for those south and east...

 

Eo7MQUB.png

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