Mesoscale Discussion 47

Issued

Jan 22, 2016, 7:30 AM CST (13:30 UTC)

Expired

Jan 22, 2016, 11:30 AM CST

In force

4 hr

Issued by

the Storm Prediction Center

The Nashville radar (KOHX), 90 km from the middle of the area, began a volume at 13:29 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

076 
ACUS11 KWNS 221331
SWOMCD
SPC MCD 221330 
KYZ000-TNZ000-INZ000-ILZ000-MOZ000-221730-

MESOSCALE DISCUSSION 0047
NWS STORM PREDICTION CENTER NORMAN OK
0730 AM CST FRI JAN 22 2016

AREAS AFFECTED...PORTIONS OF FAR ERN MO...FAR SRN IL/IND...
WRN/MIDDLE TN...AND MUCH OF KY

CONCERNING...HEAVY SNOW 

VALID 221330Z - 221730Z

SUMMARY...HEAVY SNOW WILL DEVELOP/CONTINUE THROUGH 18Z. SNOWFALL
RATES OF 1-2 INCHES/HR WILL BE COMMON.

DISCUSSION...RADAR MOSAIC AS OF 1330Z SHOWS A BAND OF MODERATE TO
HEAVY PRECIPITATION EXTENDING FROM FAR SERN MO ENEWD INTO PORTIONS
OF WRN/MIDDLE TN AND MUCH OF KY. SFC TEMPERATURES HAVE GENERALLY
FALLEN BELOW FREEZING ACROSS THIS REGION...AND TEMPERATURES ALOFT
HAVE ALSO COOLED OVER THE PAST SEVERAL HOURS. THIS HAS SUPPORTED A
TRANSITION TO MAINLY SNOW ACROSS THE MCD AREA. ACROSS PARTS OF
MIDDLE TN...THE TRANSITION TO SNOW HAS OCCURRED WITHIN THE PAST
HOUR...AS THE 12Z SOUNDING FROM KBNA SHOWED A NEARLY ISOTHERMAL
PROFILE ALONG THE 0 DEG C ISOTHERM FROM THE SFC TO AROUND 780 MB. AS
THE UPPER LOW OVER THE LOWER MS VALLEY/MID SOUTH PIVOTS NEWD THROUGH
THE REMAINDER OF THE MORNING...A DEFORMATION ZONE OF HEAVY SNOW
ASSOCIATED WITH STRONG LOW- TO MID-LEVEL FRONTOGENESIS APPEARS
LIKELY TO DEVELOP/CONTINUE...WITH SNOWFALL RATES OF 1-2 INCHES/HR
COMMON. THE HEAVY SNOW WILL GRADUALLY END ACROSS WRN PORTIONS OF THE
MCD AREA THROUGH 18Z AS THE UPPER LOW AND ASSOCIATED MID- TO
UPPER-LEVEL FORCING MOVE NEWD.

..GLEASON.. 01/22/2016

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...RLX...MRX...JKL...ILN...LMK...OHX...PAH...MEG...

LAT...LON   35798799 35808891 36198923 36658957 37198926 37638866
            37978734 38318556 38438323 38238272 37748243 37428244
            36748322 36388485 36018668 35798799

Mesoscale Discussions in Kentucky, 2016Mesoscale Discussions in Tennessee, 2016Mesoscale Discussions in Illinois, 2016Every mesoscale discussion in 2016

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.