Skip Navigation Links weather.gov 
NOAA logo-Select to go to the NOAA homepage NOAA's National Weather Service   Select to go to the NWS homepage
Storm Prediction Center
navigation bar left  
  navigation bar end cap


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

Mesoscale Discussion 21
< Previous MD         Next MD >
MD 21 graphic

   Mesoscale Discussion 0021
   NWS Storm Prediction Center Norman OK
   0338 AM CST Fri Jan 12 2018

   Areas affected...Parts of southern AR...northern LA and west-central
   MS

   Concerning...Winter mixed precipitation 

   Valid 120938Z - 121545Z

   SUMMARY...A mixture of freezing rain and sleet will continue to
   spread eastward during the late overnight into the morning across
   south-central and southeast Arkansas, north-central and northeast
   Louisiana, and into west-central Mississippi.  Freezing rain rates
   should generally be up to 0.05-0.10 inches per 3 hours, though
   higher rates (0.10+ inch/hour) associated with a north-south band of
   moderate precipitation will remain possible, as this band advances
   east.  Locations in south-central Arkansas and north-central
   Louisiana should have a decrease in wintry precipitation by 12-13Z.

   DISCUSSION...GOES-16 IR imagery indicated a north-south band of
   cooling cloud tops moving eastward through south-central AR and
   north-central LA early this morning, with surface observations from
   KCDH and KELD to KRSN indicating moderate to heavy precipitation
   rates since 08-09Z in this band.  These higher rates and cooling
   cloud tops are co-located with a compact area of forcing for ascent
   attendant to the progressive shortwave trough.  Forecast soundings
   suggest cooling of the surface to near-surface air (generally below
   900 mb) will occur faster than the lower troposphere from 750-900
   mb, such that freezing rain and eventually a mixture of sleet and
   freezing rain will occur from west to east across the discussion
   area.

   ..Peters.. 01/12/2018

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

   ATTN...WFO...JAN...LZK...SHV...

   LAT...LON   32699273 33059299 33619297 33809264 33829190 33739149
               33539090 33279064 33119066 32789074 32529110 32499197
               32529260 32699273 

Top/All Mesoscale Discussions/Forecast Products/Home
Weather Topics:
Watches, Mesoscale Discussions, Outlooks, Fire Weather, All Products, Contact Us

NOAA / National Weather Service
National Centers for Environmental Prediction
Storm Prediction Center
120 David L. Boren Blvd.
Norman, OK 73072 U.S.A.
spc.feedback@noaa.gov
Page last modified: January 12, 2018
Disclaimer
Information Quality
Help
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities