National Weather Service Text Product Display

Severe Storm Outlook Narrative (AC)
Issued by NWS

Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50


000
ACUS11 KWNS 062103
SWOMCD
SPC MCD 062102
PAZ000-WVZ000-OHZ000-KYZ000-INZ000-TNZ000-ALZ000-ILZ000-MSZ000-MOZ000-070030-

MESOSCALE DISCUSSION 2067
NWS STORM PREDICTION CENTER NORMAN OK
0302 PM CST FRI DEC 06 2013

AREAS AFFECTED...WRN TN AND NRN MS THROUGH WRN AND CNTRL
KY...EXTREME SRN IL...SRN IND...SRN AND CNTRL OH AND WRN THROUGH
NCNTRL PA

CONCERNING...WINTER MIXED PRECIPITATION

VALID 062102Z - 070030Z

SUMMARY...BAND OF MODERATE TO OCCASIONALLY HEAVY SNOW WILL CONTINUE
NEWD THROUGH THE OH VALLEY INTO EARLY EVENING. SNOWFALL RATES FROM
0.5 TO 1 INCH PER HOUR WILL REMAIN LIKELY WITH RATES LOCALLY
EXCEEDING 1 INCH PER HOUR. THE PRECIPITATION SHOULD REMAIN MOSTLY
FREEZING RAIN FROM PARTS OF WRN TN INTO SCNTRL AND CNTRL KY.

DISCUSSION...THIS AFTERNOON AN EXPANSIVE AREA OF WINTER
PRECIPITATION PERSISTS FROM WRN PARTS OF THE TN VALLEY NEWD THROUGH
MUCH OF THE OH VALLEY. WITH THE EXCEPTION OF CNTRL AND SRN
KY...PRECIPITATION TYPE WILL LIKELY REMAIN SNOW ACROSS MOST THE OH
VALLEY. THE EXIT REGION OF AN UPPER JET EJECTING NEWD THROUGH THE
MID MS VALLEY IS COUPLED WITH ENTRANCE REGION OF A POLAR JET LOCATED
OVER THE GREAT LAKES. AGEOSTROPHIC CIRCULATION ACCOMPANYING THESE
FEATURES IS AUGMENTING FRONTOGENETIC FORCING ALONG A SW-NE ORIENTED
BAROCLINIC ZONE LOCATED FROM THE LOWER MS VALLEY THROUGH THE OH
VALLEY. THIS ZONE OF STRONGER FORCING WILL CONTINUE SHIFTING NEWD
THROUGH THE OH VALLEY INTO EARLY EVENING RESULTING IN ENHANCED
SNOWFALL RATES. MOREOVER...FORECAST SOUNDINGS SHOW SATURATED DEEP
ISOTHERMAL LAYERS WITH TEMPERATURES BETWEEN -2 TO -8 C BENEATH THE
DENDRITIC GROWTH ZONE...WHICH SHOULD ENHANCE THE EFFICIENCY OF
SNOWFLAKE GROWTH.

FARTHER SOUTH...STRONG SWLY FLOW BETWEEN 850-700 MB WILL MAINTAIN A
NOSE OF WARM AIR ABOVE THE SUBZERO LAYER...RESULTING IN A
CONTINUATION OF FREEZING RAIN FROM PARTS OF WRN TN INTO SRN AND
CNTRL KY INTO EARLY EVENING. PRECIPITATION RATES IN THIS ZONE WILL
BE AUGMENTED AT TIMES WITHIN RAPIDLY MOVING CONVECTIVE SHOWERS.

..DIAL.. 12/06/2013

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

ATTN...WFO...CTP...PBZ...RLX...CLE...JKL...ILN...LMK...OHX...
IND...HUN...PAH...MEG...

LAT...LON   39068688 40268448 41537936 40877837 38788248 36598610
            35018813 34669001 37048915 39068688

National Weather Service National Headquarters