Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 330 AM EDT Thu Oct 03 2024 Valid 12Z Thu Oct 03 2024 - 12Z Sat Oct 05 2024 ...Showers and thunderstorms return to the Gulf Coast from Thursday evening into Saturday... ...Rain develops over the Pacific Northwest and scattered showers over parts of the Midwest, Central/Southern Appalachians, and Northeast... ...There are Excessive Heat Warnings and Heat Advisories over parts of Southern California and the Southwest... On Thursday, tropical moisture will start to build over the Central/Eastern Gulf Coast and Florida. Upper-level energy over the Western Gulf Coast and Northern Gulf of Mexico will move into parts of the Southeast and Central Gulf Coast, producing showers and thunderstorms over parts of the Gulf Coast from Thursday evening into Saturday. In addition, showers and thunderstorms will develop over parts of Florida through Saturday. Furthermore, the moisture will also build over the Central/Southern Appalachians, as upper-level energy moves over the area, showers and thunderstorms will develop from Thursday afternoon into Friday evening. Meanwhile, a front extending from the Upper Great Lakes to parts of the Central Plains will move eastward to just off the Northeast and Mid-Atlantic Coast by Saturday. The boundary will produce rain with embedded thunderstorms over parts of the Middle Mississippi Valley on Friday morning into the early afternoon. As the front moves into the Northeast and Mid-Atlantic, showers and thunderstorms will develop over parts of the region late Friday evening into Saturday. In addition, on Friday morning, a second front will move onshore over the Pacific Northwest, moving to the Northern Plains by Saturday. The system will produce rain over parts of the Pacific Northwest from Friday into late Friday evening. Overnight Friday, wet snow will develop over the highest elevations of the Cascades. The rain will expand into the Northern Intermountain Region Friday evening into Saturday. Moreover, the upper-level ridge over the Four Corners Region will create high temperatures over Southern California and the Southwest, ranging from the upper 90s to 110s. Low temperatures will be in the upper 80s to low 90s, providing little relief from the heat overnight. The temperatures have prompted Excessive Heat Warnings and Heat Advisories over parts of Southern California and the Southwest. Record-breaking heat is expected across portions of the Southwest this week. Moderate to major heat impacts are possible in areas near San Francisco, Las Vegas, and Los Angeles. Extreme Heat Risk impacts are forecast for parts of the Southwest. Remember, Heat is the Deadliest Weather Phenomenon in the U.S.! People spending more time outdoors or in a building without cooling are at an increased risk of heat-related illness. Visit www.weather.gov/safety/heat and check local media and government websites for information on cooling centers. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php