Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 350 PM EDT Thu Jun 21 2018 Valid 00Z Fri Jun 22 2018 - 00Z Sun Jun 24 2018 ...Wet weather with continued threats for flash flooding from the Ohio valley to the northern Mid-Atlantic region... ...Threats for severe storms from portions of the Mid-Atlantic into the lower/Mid-Mississippi valley into the High Plains... ...Hot weather in store for California into the Desert Southwest... Increased chances for thunderstorms will be in place near a slow moving cold front which will be edging east from the Mid-Mississippi valley this evening into the Ohio valley on Friday. There is a Slight Risk of severe storms near the front across portions of the lower to middle Mississippi valley today via the Storm Prediction Center with Marginal Risks scattered from the Mid-Atlantic region into the southern High Plains and portions of Montana and Wyoming through Friday morning. Slight Risks are progged on Friday from the southern to central High Plains as well as the lower Mississippi valley into the Southeast in the vicinity of the southern extension of the slow moving front. Scattered storms will be found near and south of a quasi-stationary front extending across the Mid-Atlantic states, positioned east of the main low pressure center moving eastward from the Ohio valley. High moisture content south of this boundary will continue to support a humid airmass across the South and East with at least some thunderstorm potential, though not everybody will see the temporary relief from the heat and humidity from rainfall. High temperatures will be near average across the Northeast on Friday but clouds and rain will keep locations from the Missouri valley into the northern Mid-Atlantic much cooler than mid-late June averages with highs forecast to range from the upper 60s to near 80. Farther south...south of the aforementioned frontal boundary...high temperatures will be seasonably hot, but with greater departures from average across Texas (5-10 degree departures) where 100+ degree readings are expected Friday and Saturday. California will also be heating up with highs expected to eclipse 100 for much of the Sacramento/San Joaquin Valley on Friday with 90s to near 100 expected into portions of the California Coastal Ranges for Saturday. Given the ongoing and expected hot weather, Heat Advisories and Excessive Heat Warnings are in effect for portions of California and the Desert Southwest. Across the interior Northwest U.S., flooding will continue to be a threat from scattered thunderstorms from portions of northern Idaho into central Montana into the weekend. This region has seen above average rainfall in recent weeks along with several rivers and streams in flood stage. Otto Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php