Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 080936
SWOMCD
SPC MCD 080936
MSZ000-LAZ000-TXZ000-081330-

Mesoscale Discussion 1786
NWS Storm Prediction Center Norman OK
0336 AM CST Fri Dec 08 2017

Areas affected...Far Southeast TX...Central/Southern
LA...Southwest/Central MS

Concerning...Heavy snow

Valid 080936Z - 081330Z

SUMMARY...Isolated/brief snowfall rates near 1 inch per hour
possible over the next several hours.

DISCUSSION...Regional radar imagery shows a relatively heavier
region of precipitation moving through central/southern LA with
observations across southwestern portions of the state recently
changing over to snow. Expectation is for wet-bulb effects to result
in enough cooling to support a change-over to snow within the hour
for the remainder of central LA. Once this change-over occurs,
isolated/brief snowfall rates approaching 1" per hour are possible.
Areas of MS that are already experiencing light snow will likely
begin to experience heavier snowfall rates, at times approaching 1"
per hour, during the next 2 to 4 hours. Snowfall will gradually
diminish from west to east as the frontogenesis responsible for this
band of precipitation shifts eastward/northeastward in response to
the progression of the mid-level trough and the advection of dry air
following in its wake.

..Mosier.. 12/08/2017

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

ATTN...WFO...JAN...LIX...LCH...SHV...

LAT...LON   30479454 31819212 32609044 33118907 32348846 30579095
            29839368 30479454




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