Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 321 PM EDT Mon Jun 19 2017 Valid 00Z Tue Jun 20 2017 - 00Z Thu Jun 22 2017 ...No relief from the current Heat Wave affecting the Southwestern U.S...Great Basin and California... ...An area of disturbed weather coming out of the tropics will threaten the Gulf Coast with heavy rains--- ...Heavy rains...severe weather and flash flooding possible into this evening across portions of the northeast... No let up expected to the ongoing heat wave across the Southwest---Great Basin and into much of California with dangerous heat expected to persist through this forecast period. Both record high temperatures and record high minimum temperatures are possible over the next few days across the southwest...California and into the Great Basin. Excessive heat warnings and heat advisories likely to continue over the next several days across these areas. The much above average temperatures that have spread all the way north into the Pacific Northwest and Northern Rockies will begin to cool down as a strong front pushes inland Tuesday into Wednesday across the northwestern U.S. and into the Northern Plains. In addition to the cooler temperatures with this front---shower/thunderstorm activity will increase over portions of the Northern Plains into the Upper Mississippi Valley Wednesday afternoon and evening. Tropical weather is become increasingly active today with an area of disturbed weather forecast to track northwestward into the central to western Gulf of Mexico. Tropical moisture is already streaming well ahead of this area of disturbed weather covering much of the central to eastern Gulf of Mexico and supporting very showery conditions across much of Florida this afternoon. The heavy rain threat associated with this area of disturbed weather will spread westward along the gulf coast over the next few days with areas from the upper coast of TX into the Florida panhandle possibly seeing very heavy rainfall amounts. Please see the latest outlooks and advisories issued by the National Hurricane Center for updates to this area of disturbed weather. The current active thunderstorms Monday afternoon along and ahead of the cold front pressing into the northeastern U.S. will likely continue into the evening hours before weakening around midnight. Heavy rains---severe weather and flash flooding will all be possible with these thunderstorms for portions of the northeast this afternoon into this evening. Quieter weather expected across the northeast Tuesday into Wednesday---although additional scattered showers/thunderstorms possible ahead of a secondary front sweeping southeastward from the lower Great Lakes Tuesday and into the northeast on Wednesday. Oravec Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php