Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 PM EDT Sun May 07 2017 Valid 00Z Mon May 08 2017 - 00Z Wed May 10 2017 ...Low pressure systems will bring showers and thunderstorms to parts of the Northeast and the Western U.S. early this week... ...Temperatures across the Central states are expected be well above normal while temperatures across the Southwest could be well below normal... The upper level low which has been the dominant feature over the northeastern U.S. still continue to stubbornly wobble over the region through the short term period. Several rounds of light to moderate showers will move across the Northeast and New England tonight through Tuesday. Temperatures will continue to be below average as northeasterly flow will bring cooler conditions for much of the East Coast. Another deep upper level low moving across the Southwest will bring precipitation across southern California and the Four Corner states over the next few days. As a result, temperatures will be well below average in these regions Sunday through Tuesday. A strong Pacific cold front will continue progressing southeast across the Central Great Basin and Rockies tonight and into tomorrow. By Monday, precipitation will increase along the central and southern Rockies and across the Intermountain West. Thunderstorms could fire off the lee of the Rockies on Monday afternoon--with a slight chance that these storms could be severe. See the Storm Prediction Center for more information. Once the strong front makes its way into the Plains and middle Mississippi Valley/Ohio Valley, showers and thunderstorms will fire off across the warm front. A marginal risk of flash flooding will be possible across these regions. Strong upper level ridging in between the Eastern and Western U.S. storm systems will allow for temperatures as much as 10 to 20 degrees above normal across the Plains states on Sunday and Monday will near record values possible especially across the Northern Plains on Sunday. Reinhart/Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php