Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 239 AM EST Sat Feb 11 2017 Valid 12Z Sat Feb 11 2017 - 12Z Mon Feb 13 2017 ...Rain and snow for the southwest U.S., and another winter storm for New England by Sunday night... A zonal flow pattern at the beginning of the period will transition to a more amplified pattern by Sunday night, with a sharp trough over the northeast U.S. and an upper level low over northwestern Mexico. An upper level ridge will become established over the West Coast. After a brief cold snap for the East Coast, a warming trend is arriving in time for the weekend courtesy of a warm front. It will continue to stay quite cold across northern New England, which will remain north of the frontal boundary. By Sunday night, another nor'easter is forecast to develop rapidly just off the New England Coast and will likely cause significant wind and snow impacts from upstate New York to Maine, and winter storm watches are already in effect. Showers and a few storms will be possible from the Deep South to the Ohio Valley this weekend as moisture from the Gulf of Mexico is advected northward around the departing surface high pressure, and ahead of a strong cold front. Given the lack of sufficient wind shear or instability, no severe weather is anticipated over the next few days. Across the western U.S., a cold front moving across the southern Rockies will keep valley rain and mountain snow in the forecast through Saturday evening. The upper low just south of Arizona will keep the weather unsettled through the entire weekend, with up to an inch of rain possible across parts of Arizona and New Mexico. Drier weather will be the rule for the West Coast with high pressure building in with sunny to partly cloudy skies D. Hamrick Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php