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Short Range Public Discussion
 
(Latest Discussion - Issued 0833Z Dec 18, 2014)
 
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Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 333 AM EST Thu Dec 18 2014 Valid 12Z Thu Dec 18 2014 - 12Z Sat Dec 20 2014 ...Chance for flash flooding and severe storms from the Western Gulf coast to the Lower Mississippi Valley... ...Heavy rain and higher elevation snows expected in the Northwest... ...Rain and snow will clear out over northern New England... The wintry mix of precipitation across the Central Plains and Middle Mississippi Valley will begin to diminish while moving northeastward into the Ohio and Tennessee Valleys on Thursday; However...energy swinging out of northern Mexico will help ignite a new area of precipitation to the north of a frontal boundary stretched over the Western Gulf Coast late Thursday. Abundant moisture from the Gulf will fuel heavy rains with embedded thunderstorms across South Texas early Friday...which should lift into the Lower Mississippi Valley by Friday afternoon. Areas of flash flooding and severe weather will both be a possibility within developing precipitation. After a day of widely scattered shower activity...a strong Pacific system approaching the coast will bring more significant precipitation into the western U.S.. Heavy rains and higher elevation snows will begin impacting the Pacific Northwest by late Thursday...and precipitation will spread southeastward over Northern California...Intermountain West...and Northern Rockies as the system moves inland over the Western U.S. on Friday. Rain and snow wrapping inland over northern New England should come to an end on Thursday as a deep surface cyclone lifts out towards the Canadian Maritimes. Light snow showers downwind of the Lower Great Lakes could linger into Friday...but an expansive surface high sliding eastward from the Upper Midwest will keep locations from the Northern Plains to the Northeast dry and quiet heading into the weekend. Gerhardt Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php