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December 2022 Observations


yotaman
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 Look at what has occurred in parts of central and even south FL this morning from the first (weaker) of the two post cold front upper level disturbances!
 

Also from MLB NWS:
   
ISSUED AT 1049 AM EST SUN DEC 25 2022  
  
A SMALL BAND OF PRECIPITATION FORMED OVER EASTERN OSCEOLA COUNTY  
AND PUSHED ACROSS CENTRAL BREVARD COUNTY AND OFFSHORE LATE THIS  
MORNING. TEMPERATURES WERE COLD ENOUGH TO PRODUCE A WINTRY MIX OF  
LIGHT SNOW AND SLEET, FROM VIERA TO MERRITT ISLAND, COCOA BEACH   
AND CAPE CANAVERAL. MAINLY TRACE AMOUNTS HAVE OCCURRED WITH RAPID   
MELTING.

 Here's a link to video evidence of wintry precip:

 

https://twitter.com/realTimB/status/1607043178372243457/mediaViewer?currentTweet=1607043178372243457&currentTweetUser=realTimB

 In addition, Immokalee in SOUTH FL a little before this reported "MIX PCPN" at 10 AM!

 IMMOKALEE      MIX PCPN  39  27

 

  How often does it rain with it as cold as 41 in West Palm Beach at noon?!?

 W PALM BEACH   LGT RAIN  41  32  70 NW13

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 What an impressive cold spell that went all of the way to the coast at its peak on 12/24 thanks to very strong W to WNW winds that prevented modification from the ocean. The little bit of modification was mainly from the marshes west of there. The inland areas had lows of 19 on 12/24, but Ft. Pulaski right on the coast had 22! The highs there and inland were only 33.

 On 12/25, Ft. Pulaski had a low/high of 27/44. This morning they were down to ~31.
 
 What's even more impressive are the offshore buoys 41004/41008:

- On 12/24, 41004 (Gray's Reef 50 miles SE of Savannah) got down to a low of 28.2 at 9:50 AM, which was over an SST of 60! It was below 32 for 9 straight hours and below 40 for 40 straight hours!

- On 12/24, 41008 (Edisto 45 miles SE of Charleston) got down to a low of 28.4 at 11:40 AM, which was over an SST of 69! It was under 32 for 10 straight hours and under 40 for 41 straight hours!

 

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 If I were in the Atlanta to Athens corridor and even well south to below the southern ATL burbs, I'd be pretty excited about the chance to see snow fall tonight, possibly even with light accumulations in some areas. This is a very tough call due to the very dry air there now, but check out Tunica in far NW Mississippi posted at the bottom. They received one inch within an hour!  Memphis and other nearby areas also got snow. Most models, including mesoscale, didn't have that much there. 
 

 In GA though, dews are only in the single digits to just below 0! In the Memphis area, dews were a bit higher in the mid teens before the snow fell. So, there's a good bit drier air over N GA to overcome at the surface. Nevertheless, though it isn't mesoscale and thus fwiw, the 12Z UKMET has an area of accumulating snow from N AL to NW GA. But it also has a heavier area from the W ATL burbs through ATL with a likely overdone max of 1.5" at Carrollton and tapering down to ~0.3" in Atlanta. The 12Z Euro has nothing of the sort and instead has a max of ~0.5" between Gainesville and Athens. Neither model had the 1" at Tunica.

 On the mesoscale models, both the latest NAM and WRF have nothing accumulating over N GA other than a very thin strip of a tenth or two on the WRF from E of Lake Lanier to the SC border. But both have a very narrow band quite a ways to the south over north central GA but not til ~midnight with a max on the NAM of nearly 1" near LaGrange! Going to be fun to follow:

 

AREA FORECAST DISCUSSION   NATIONAL WEATHER SERVICE MEMPHIS TN

UPDATE     ISSUED AT 1125 AM CST MON DEC 26 2022    
 

QUICK UPDATE. TEMPERATURES ARE QUITE UNEVEN ACROSS THE FORECAST   AREA AT THIS HOUR. MOST SUBFREEZING TEMPERATURES CAN BE FOUND   ACROSS NORTH MISSISSIPPI, WHERE HEAVY WET SNOW HAS CREATED ICY   ROADWAYS, BRIDGES, AND OVERPASSES. TUNICA, MISSISSIPPI PICKED UP   AN INCH IN ABOUT AN HOUR AND REPORTED VERY DENSE FOG LAST HOUR.   TEMPERATURES LOOK TO REMAIN SUBFREEZING ALONG THE TENNESSEE AND   MISSISSIPPI BORDERS FOR THE NEXT COUPLE OF HOURS, WHERE   ACCUMULATING SNOWFALL IS EXPECTED TO CONTINUE. ANOTHER HALF INCH   UP TO AN INCH OF SNOW IS POSSIBLE IN THESE AREAS.

 

Edit: Check out this from Tunica at 10AM CST!

            
TUNICA         HVY SNOW  31  29  92 S8        30.27R VSB<1/4 WCI  23  
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The radar looks pretty impressive between Atlanta and Athens. But how much is reaching the ground? So far in Atlanta, itself, and just north, very little or nothing has reached the ground with dewpoint depressions still 25-30 in most cases.

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Starting just before 10 PM, snow suddenly started coming down quite nicely from the eastern burbs of ATL eastward under those impressive radar returns! Expect road problems almost immediately!

 Edit: light snow reported at all immediate Atlanta stations as of midnight!

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KATL ended up with 0.1" of snow/sleet 

 KSAV last four mornings had very hard freezes with these lows: 19, 21, 22, and 25. Another freeze is expected tonight with upper 20s. This long stretch of hard freezes isn't something seen often way down here. The last time was five years ago. I (and my Sago Palms) am actually looking forward to some warming, especially feeling that it will likely not be a long lived torch but rather just an interlude of mild. I enjoy the volatility of winter overall as long as a good amount of cold/very low dewpoints is included. It is so much more interesting than the dog days of summer.
 

 What an up and down month with first half torch and last half brrrrr. It will go down in the books as near normal, but that's deceptive as there wasn't much normal about it when you break it into halves. As of today, the month has averaged almost dead on normal! 

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We are already up to 3.20” of rain just since midnight, and it looks like the worst is still west of us. In looking at the radar, the front seems to be moving extremely slow toward the east, with the thunderstorms training toward the north and northeast. Am I seeing it correctly? If so, that is a scary and dangerous scenario for the Upstate of S.C. 

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11 hours ago, gman said:

We are already up to 3.20” of rain just since midnight, and it looks like the worst is still west of us. In looking at the radar, the front seems to be moving extremely slow toward the east, with the thunderstorms training toward the north and northeast. Am I seeing it correctly? If so, that is a scary and dangerous scenario for the Upstate of S.C. 

Wrong month!

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