Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 401 AM EDT Wed Jun 13 2018 Valid 12Z Wed Jun 13 2018 - 12Z Fri Jun 15 2018 ...Severe thunderstorms are possible across the Northeast today and likely across the Northern Plains Thursday mad Friday... ...Heavy rain and flash flooding possible for portions of the central U.S. and the lower Ohio Valley today, Upper Midwest Thursday and Friday and southern Arizona on Friday... ...Heat wave to continue for portions of the Southwest with a warming trend expected across the Intermountain West and the central U.S.... Scattered showers and thunderstorms will persisted across much of the Central Plains, the Deep South and the Ohio Valley ahead of a frontal boundary tracking slowly to the east. This boundary will provide a focus for heavier rainfall and strong to severe thunderstorms, particularly across portions of the lower Ohio Valley and the Central Plains. Slow storm movement will increase the threat for heavy rainfall and flooding. WPC has slight risks for excessive rainfall/flash flooding highlighted across these regions today. Strong to severe thunderstorms will be possible for much of the Northeast. The Storm Prediction Center is has a slight risk for severe weather for this sector of the U.S. A frontal system will cross through the Rockies and exit into the Northern High Plains over the next few days which will provide focus for strong convection across the Northern Plains. The Storm Prediction Center has much of North Dakota and western Minnesota in a slight risk with an enhanced risk over central North Dakota through Friday. Please refer to the SPC webpage for additional information on the risque for severe weather. Persistent ridging in the upper levels will keep summer heat locked in across the Southwest with afternoon highs in the 90s and low 100s likely through Wednesday. These values are as much as 10 degrees above normal for this time of the year, and excessive heat warnings are in effect across parts of southern Arizona, eastern California and far southern Nevada. Temperatures are expected to moderate to near or below normal by Thursday as the upper ridging shifts eastward. Elsewhere, temperatures across the central U.S. and intermountain West will also be 10 to 15 degrees above normal ahead of a frontal boundary entering the Pacific Northwest by Wednesday. Moisture from Hurricane Bud is making its way northward through Western Mexico. Portions of southern Arizona will begin to have rain associated with this tropical system by Thursday, with more coverage by Friday. Campbell/Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php