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1-20-16 Winter Storm


1234snow

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The RAP and HRRR are sending a band of snow across the state early morning but I'm wondering if most of this will be virga as the dew points are still very low.

 

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Yeah I'm betting so.  The majority of precip that reaches the ground would be back where the southern fetch of moisture is feeding in.  I keep waiting to see signs of that moisture streaming north into it on radar, still nothing appreciable yet on radar.  Although looks as though low level moisture feeding it from the south is growing and expanding a bit.

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Yeah I'm betting so.  The majority of precip that reaches the ground would be back where the southern fetch of moisture is feeding in.  I keep waiting to see signs of that moisture streaming north into it on radar, still nothing appreciable yet on radar.  Although looks as though low level moisture feeding it from the south is growing and expanding a bit.

Looking at the radar,could be coming in quicker?

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NATIONAL WEATHER SERVICE NASHVILLE TN
745 PM CST TUE JAN 19 2016

.DISCUSSION...
LATEST SURFACE ANALYSIS DEPICTS SNOW ACROSS THE NORTHERN HALF OF
MO. FREEZING RAIN AND SOME SLEET OVER SRN MO...SOME FRZ RAIN
ACROSS NRN AR. 00Z OHX SOUNDING REVEALED 850 MB TEMPS THAT WERE
SLIGHTLY WARMER THAN THE MODELS. WET BULB ZERO PROFILES AT THE 850
MB LEVEL SHOWS A RATHER IMPRESSIVE WEDGE OF WARMING ACROSS AR.
PORTIONS OF NRN AR AND SRN MO SHOW FRZ RA WITH TEMPS IN THE LOWER
TO MID 20S...A TESTAMENT AS TO THE DEGREE OF WARM WEDGING THAT IS
ON GOING. SFC LOW IS CURRENTLY LOCATED OVER ERN OK. SLIGHT
INCREASE IN STRENGTH IS EXPECTED WITH THE WARM AIR IN THE 800MB TO
900 MB LEVEL WORKING EASTWARD. THIS WARMER AIR MAY VERY WELL MAKE
IT INTO OUR SOUTHWESTERN COUNTIES PRIOR TO 12Z. THUS...I WILL GO
AHEAD AND INCLUDE MORE IN THE WAY OF SLEET AND FREEZING RAIN
ACROSS OUR SOUTHWESTERN AND SOUTH CENTRAL AREAS.

LATEST HRRR SHOWS PATCHY LIGHT PRECIP MAKING IT ACROSS THE TN
RIVER AND REACHING THE GROUND JUST AFT MIDNIGHT. THE MORE
SIGNIFICANT PRECIP APPEARS TO MAKE IT ACROSS THE TN RIVER RIGHT
AROUND 6 AM. BASED ON THE LATEST 18Z NAM SOUNDINGS...IT STILL
LOOKS LIKE ALL SNOW NORTH OF I-40. BUT...THAT SOUTHWEST AREA IS A
CONCERN AND MORE IN THE WAY OF SLEET AND FREEZING RAIN COULD
FALL. AGAIN...WILL OPT TO MODIFY THE WX GRIDS TO REFLECT THIS
ACROSS SOUTHWEST AND SOUTHCENTRAL AREAS. SFC TEMPS STILL EXPECTED
TO WARM ABOVE FREEZING ACROSS THE SOUTHWEST BY 9AM...AND THEN ALL
BUT THE PLATEAU AREA BY NOON.

UPDATE OUT SHORTLY.

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HELLO! That's approaching warning criteria across much of east TN.

MRX calls it an outliner on their latest disc

 

.DISCUSSION...

LIGHT PRECIP IS SEEN ON RADAR MOVING INTO MIDDLE TN...BUT NOTHINGIS REACHING THE GROUND YET EAST OF THE MS RIVER...AS THE 00Z OHXSOUNDING SHOWS A DRY LAYER FROM THE SURFACE TO AROUND 850 MB. A FEWLIGHT FLURRIES MAY REACH THE GROUND BEFORE SUNRISE...BUT THEMEASURABLE PRECIP WILL LIKELY COME INTO THE PLATEAU AROUND 12-15Z.THE LATEST MODEL DATA SUPPORTS THE CURRENT FORECAST TIMING ANDP-TYPE...WITH A SNOW/SLEET/FZRA MIX SOUTH OF KNOXVILLE...AND ALLSNOW NORTH. THE NAM CONTINUES TO BE AN OUTLIER WITH HEAVIER SNOWAMOUNTS...WHICH GIVEN THE SPEED AND STRENGTH OF THE SYSTEM...SEEMSTOO HIGH. THE CURRENT FORECAST AMOUNTS OF 1-3 INCHES REMAIN INLINE WITH THE GFS/SREF/ECMWF CONCENSUS.NO SIGNIFICANT CHANGES WILL BE MADE TO THE FORECAST.
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HELLO! That's approaching warning criteria across much of east TN.

Very interesting. NAM has consistently been north with the heavier snows in south central KY while the euro, euro control, and rgem have been south with that banding in northern middle TN. Will be interesting to see which model wins there.

Also interesting is the larger max further east into northeast TN too. Pretty crazy.

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