Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 510 AM EDT Tue Aug 11 2020 Valid 12Z Tue Aug 11 2020 - 12Z Thu Aug 13 2020 ...Heat Advisories for some of the big cities in the Northeast... ...Scattered severe thunderstorms possible over the Northern/Central High Plains... ...Elevated fire weather conditions continuing in portions of the Western U.S... A weather system located over the Great Lakes will prompt an increase of southwesterly winds into the mid Atlantic and New England states today. This will cause temperatures to soar into the 90s, and humidity will push heat indices to the upper 90s or even above 100 degrees at times. Warm overnight lows in the middle 70s also make it difficult for the body to recover from the heat. Avoiding strenuous outdoor activities and ensuring you have or can find a safe, air conditioned environment, is important to staying healthy. Heat advisories on Tuesday include New York and Boston, while Philadelphia, Baltimore, and Washington will also experience very hot weather. Over the middle of the country there is a chance of strong thunderstorms and locally heavy rain. While the storms will not be as strong as what hit Iowa and Illinois on Monday, there is a risk of some severe weather over the Plains and lower Mississippi Valley. A cold front will bring afternoon thunderstorms to western and central New York today, and this same front will help take the edge off of temperatures along the I-95 corridor from late Wednesday into Thursday. A pair of cold fronts producing windy conditions, but little precipitation, will factor into elevated to critical fire weather conditions today across portions of the Northwest, Northern Rockies and Great Basin. Red Flag Warnings are in effect for many areas in the West. And with very little monsoon moisture to speak of, daytime temperatures remain well above 100 degrees in the Desert Southwest. On Monday Death Valley, California, saw the nation's high temperature at 121 degrees Fahrenheit. Local National Weather Service Offices have posted an Excessive Heat Watch for desert areas in southern California and southern Arizona starting Wednesday, as high temperatures may commonly reach 110 to 115 degrees from mid to late week. Burke Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php