Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 226 AM EDT Mon Jun 03 2024 Valid 12Z Mon Jun 03 2024 - 12Z Wed Jun 05 2024 ...Excessive Rainfall and Severe Weather threaten portions of the Mississippi Valley and Southern Plains today... ...Increasing Excessive Heat Risk potential over parts of the West and southern Texas through mid-week... Shortwave energy spinning through the Northwest will support showers and thunderstorm activity across the region today. Rainfall rates over the favored terrain of the Cascades and Northern Rockies will be high enough to warrant an Excessive Rainfall threat. Thus, a Slight Risk (at least 15%) of Excessive Rainfall leading to Flash Flooding is in effect for portions of the Northern Rockies, while a Marginal Risk (at least 5%) area is in place over the Cascades, Olympics and Seattle Metro area. Elsewhere, showers and thunderstorms are expected to continue over parts of the Great Plains and Mississippi Valley today. Pockets of severe thunderstorms capable of producing heavy to excessive rainfall may develop over parts of the Southern Plains into the Mississippi Valley. Slight Risks of Excessive Rainfall and Severe Thunderstorms are in effect over those areas, where a swath of damaging wind gusts are possible. The severe thunderstorm threat concentrates over parts of the Central Plains and Middle Mississippi Valley on Tuesday, where a Slight Risk is in effect. Large hail is possible at the outset when storms are more cellular, but will then be followed by a congealing of cells into a line of storms with damaging wind gusts eventually being the main threat. An upper ridge is expected to develop over the West early to mid-week. High temperatures will gradually climb into 100s by Wednesday and Thursday with many records potentially being tied or broken on those days. Excessive Heat Warnings are in effect for the central valley region of California while Excessive Heat Watches are in effect for parts of the Desert Southwest. Extreme HeatRisk is probable to continue for much of southern Texas through Wednesday. This level of heat risk means that there will likely be little to no overnight relief for those without effective cooling and/or adequate hydration. Kebede Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php