Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 411 PM EDT Mon May 08 2017 Valid 00Z Tue May 09 2017 - 00Z Thu May 11 2017 ...There is a slight risk for severe thunderstorms across portions of the Central/Southern High Plains... ...Heavy rain possible over parts of the Ohio Valley... ...Temperatures will be 10 to 20 degrees below average over the Southwest... A wave of low pressure over Northern Plains/Upper Mississippi Valley will move southeastward to the Ohio Valley by Wednesday morning. Showers and thunderstorms will develop along the associated boundary from parts of the Upper/Middle Mississippi Valley into the Ohio Valley that will extend from the Southern Mid-Atlantic to the Ohio Valley to the Central Plains by Wednesday. Meanwhile, a deep upper-level low over Northwestern Mexico/Southern California will slowly move northeastward to the Southwest/Southern Rockies by Wednesday. The storm will produce showers and thunderstorms will develop over parts of Central California eastward to the Central/Southern High Plains westward to the Southwest that will move eastward to the Central/Southern Plains while ending over the western portion of the Great Basin by Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php