Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 348 AM EDT Mon May 08 2017 Valid 12Z Mon May 08 2017 - 12Z Wed May 10 2017 ...Slight risk for severe thunderstorms across portions of the High Plains Monday and Tuesday... ...Central U.S. temperatures will be above normal, while Northeast and Southwestern states are well below normal... Showers and thunderstorms will be on the increase through the short range period ahead and to the north of a deep upper level low which lifts into the Four Corners region by Tuesday. Locally heavy rainfall and severe thunderstorms are possible, especially across portions of eastern Colorado on Monday and the southern High Plains on Tuesday. Refer to the Storm Prediction Center for more information regarding the severe weather threat. In addition to precipitation, temperatures across much of the Southwest will be well below normal, with afternoon highs as much as 10 to 20 degrees below normal. To the north, rain and storms across the Northern Plains will shift eastward into the middle Mississippi Valley and the Ohio Valley the next few days. Expect the most organized activity to be along a frontal boundary which stalls across the Ohio Valley on Tuesday and into Wednesday. Moderate to heavy rainfall and localized flash flooding may be possible. An upper level low remains anchored over the Northeast which should keep mainly scattered to light rain in the forecast through the middle of the week. With northeasterly flow across the region, temperatures will be below average, with light snowfall possible Monday and Tuesday nights across portions of the interior Northeast. Strong upper level ridging in between the Northeast and Southwestern U.S. storm systems will allow for temperatures as much as 10 to 15 degrees above normal Sunday and Monday across the Central Plains and into the Deep South. Above average temperatures will also be possible across portions of the Northwest as upper level riding builds over the region this week. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php