Severe Storm Outlook Narrative (AC)
Issued by NWS

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8

000
ACUS11 KWNS 171221
SWOMCD
SPC MCD 171221
NCZ000-VAZ000-SCZ000-171715-

Mesoscale Discussion 0030
NWS Storm Prediction Center Norman OK
0621 AM CST Wed Jan 17 2018

Areas affected...northern South Carolina through central North
Carolina and south central Virginia

Concerning...Heavy snow

Valid 171221Z - 171715Z

SUMMARY...Snowfall rates locally up to 1 inch per hour are possible
through the morning from a portion of northern SC, central NC and
south-central VA.

DISCUSSION...The freezing line from east-central NC through western
SC continues slowly east due to progression of deeper baroclinic
zone and also evaporative cooling within the near-surface melting
layer. Bands of mostly light snow persist from western SC through
western and Central NC into southern VA. However, water vapor and IR
imagery indicates upper trough taking on a more neutral tilt across
the TN Valley with general cloud-top cooling noted within the last
couple of hours. Model data have been consistent with strengthening
a mid-upper jet within base of this trough. The resulting forcing in
the exit region of this feature may enhance snowfall rates within
evolving bands through the morning, especially from central NC into
south central VA where rates could approach 1 inch per hour at
times.

..Dial.. 01/17/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...AKQ...RAH...RNK...CAE...GSP...

LAT...LON   35058154 36907968 36547770 34927981 35058154



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.