2014-15 Winter Thread (Northern Hemisphere) (climate, snowfall, warm, temperatures)

[NorthStarDelight]

Originally Posted by srfoskey

Funny thing is, it's 45 here. We're supposed to get 8-12" of snow tonight, but I have no idea how that's going to happen, unless it starts cooling off quick. I predict a rain/snow mix with marginal accumulation.

Yeah, we still need to shed those 3 critical degrees to get anything to stick. Mix of sleet and snow, still pretty light although there's some heavier radar returns to the west of us. Sure hope that's frozen precip and not rain.

Cam - is sleet good? Better than rain, I know, but does it portend a positive trend for later in the storm?

[tommyFL]

Would someone like to tell me why the coolest temp in the forecast is 64F?

[NorthStarDelight]

And we have 100% snow.

Let's keep this up and get those temps down, baby. 3 hours 45 minutes to sunset - it can't come soon enough.

[Mr Bruce]

Funny how the GSP radar "sees" Paris Mountain as precipitation extending into the upper sections of the state sometimes.

[Cambium]

Originally Posted by NorthStarDelight

We're getting light sleet - air temp is 35 degrees. Is that a good sign? (Does sleet early on mean snow later, or rain?)

Originally Posted by NorthStarDelight

The sleet's stopped - got nothing for a few minutes and now...drumroll please, we have FLAKES. Big ones, few and far in between, but picking up by the minute.

Originally Posted by NorthStarDelight

Mix of sleet and snow, still pretty light although there's some heavier radar returns to the west of us. Sure hope that's frozen precip and not rain.

Cam - is sleet good? Better than rain, I know, but does it portend a positive trend for later in the storm?

Haha, Awesome OBS's. Looks like you wanted some real time answers. lol. Are you on twitter?? I have over 1000 people and meterologists Im following. They would answer these questions and would love to hear your OBS from the area. You don't even have to tweet...just reading through them is awesome.

Sleet is good because its signaling the layer above the surface is thick enough that it doesn't have time to melt the liquid. But of course that doesn't mean anything for later when warmer air can filter in. But sleet is better than freezing rain. more amount of below freezing above.

So I just checked the sounding for just north of Atlanta.. looks like there was a thick enough cold layer above the surface for the sleet to fall as I said... It wasn't super cold and it was hovering around freezing mark so the flakes were not melting all the way to liquid... then the air cooled enough and you got snow falling.





You're right on the border at the 850mb level! Like walking a tight rope

[Cambium]

Walking a tight rope being on the border of that 850mb freezing line. 4000 feet above your head its hovering around freezing.

Take radar off to see it better. SPC Hourly Mesoscale Analysis

[NorthStarDelight]

Yeah, it's been switching back and forth between sleet and snow - had a bit of a pause, started back with sleet, currently we have about a 50/50 mixture and my temp is 33 - just one more degree to go.

The deck is just now started to get coated too - sleet sticks better than snow for sure.

[Cambium]

Originally Posted by NorthStarDelight

Yeah, it's been switching back and forth between sleet and snow - had a bit of a pause, started back with sleet,

Atmosphere trying to cool, trying to warm. It's an interesting thing to experience but a pain in the neck. Your OBS is exactly what I'm seeing... there's just a borderline layer above you that's not cold or warm enough to make it one thing.

unfortunetly it will stay like that the rest of the evening and night until it all cools below freezing tomorrow morning but by that time the precip is gone.



A look at the current radar, metars and 850mb temps in the south.

2-3 inches has accumulated in Northern Alabama.

You can see below the freezing line it's rain. If it's not below freezing at 4000+ feet forget snow

[Cambium]

We should of started a Southeast Snow storm thread,

Wow. NWSGSP upped Charlotte to 10-12 inches. They kept Asheville as is for the most part.

http://forecast.weather.gov/showsigw...9#.VO43ZWUo7IV

NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
328 PM EST WED FEB 25 2015

...A SIGNIFICANT WINTER STORM WILL AFFECT THE REGION THIS EVENING AND
TONIGHT...

.A LOW PRESSURE SYSTEM OVER THE NORTHWEST GULF OF MEXICO THIS
EVENING...AND THEN TRACK QUICKLY NORTHEASTWARD ALONG THE CAROLINA
COAST TONIGHT. AT THE SAME TIME...COLDER AIR IS EXPECTED TO MOVE
DOWN FROM THE NORTH. PRECIPITATION WILL BEGIN AS RAIN IN SOME
AREAS OUTSIDE THE MOUNTAINS...BUT IS EXPECTED TO CHANGE OVER TO
SNOW AS THE INTENSITY INCREASES AND THE TEMPERATURE COOLS INTO THE
EVENING HOURS. THE SNOW IS LIKELY TO BECOME HEAVY AT TIMES DURING
THE EVENING HOURS AS THE LOW PRESSURE SYSTEM MAKES ITS CLOSEST
PASS BY THE AREA. THE HEAVY SNOW WILL MOVE EAST AND TAPER OFF
EARLY THURSDAY MORNING AS THE LOW MOVES NORTHEAST ACROSS THE
WESTERN ATLANTIC.

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 AM EST
THURSDAY...

* LOCATIONS...FOR MOST OF WESTERN NORTH CAROLINA...NORTHEAST
GEORGIA AND THE SOUTH CAROLINA UPSTATE.

* HAZARDS...RAPIDLY ACCUMULATING SNOW ON HIGHWAYS THIS EVENING
INTO EARLY THURSDAY THAT WILL CAUSE VERY HAZARDOUS TRAVEL
CONDITIONS. HEAVY SNOW WILL RESTRICT VISIBILITIES TO LESS THAN A
HALF A MILE AT TIMES.

* TIMING...PRECIPITATION WILL ARRIVE IN NORTHEAST GEORGIA...THE
WESTERN UPSTATE OF SOUTH CAROLINA AND THE SOUTHWEST MOUNTAINS OF
NORTH CAROLINA BY LATE THIS AFTERNOON AND THEN QUICKLY SPREAD
EAST ACROSS THE REMAINDER OF THE AREA EARLY THIS EVENING. RAIN
MAY OCCUR INITIALLY BUT QUICKLY TRANSITION TO SNOW.

* ACCUMULATIONS...SNOW ACCUMULATION OF 5 TO 8 INCHES ACROSS THE
FOOTHILLS AND NORTHERN UPSTATE OF SOUTH CAROLINA. AREAS ALONG
AND EAST OF THE INTERSTATE 77 CORRIDOR ACROSS CHARLOTTE METRO
AREA MAY SEE VALUES BETWEEN 10 TO 12 INCHES.

[Cambium]

Shreveport Louisiana

https://twitter.com/SteveWAFB/status...817100/photo/1



Monroe Louisiana

https://twitter.com/weatherchannel/s...350208/photo/1