Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 PM EDT Sun Jun 07 2020 Valid 00Z Mon Jun 08 2020 - 00Z Wed Jun 10 2020 ...Tropical Storm Cristobal makes landfall in Louisiana this afternoon, then tracks up the Mississippi Valley through Tuesday with impacts from heavy rain, strong wind gusts, coastal and inland flooding, and isolated tornadoes... ...Strong low pressure system to generate severe thunderstorms across the northern and central Plains, heavy snow in parts of the northern Rockies... ...The West cools off substantially but critical to extreme fire danger continues in the southern Rockies and High Plains... Cristobal makes landfall in Louisiana this afternoon with intense rain bands and tropical storm force winds battering the central Gulf Coast. A High Risk for excessive rainfall remains in place for eastern Louisiana and southern Mississippi along with the ongoing threat for dangerous coastal flooding along the Central Gulf Coast through this evening. An additional 2 to 5 inches of rain is possible in the High Risk areas with localized amounts of 7 inches or more possible. Heavy showers and thunderstorms also continue across northern and central Florida where torrential downpours could occur. As the storm moves ashore, Cristobal's northeast quadrant will also over the central Gulf Coast, thus leading to the opportunity for tornadoes this evening and overnight. Cristobal then heads for the Mississippi Delta region Monday morning, then into the Arkansas later in the day where very heavy rainfall will keep the threat for flash flooding in the forecast across much of the Lower Mississippi Valley. Cristobal becomes post-tropical Tuesday with heavy rain and gusty winds working there way through the mid-Mississippi Valley and eventually into the Upper Midwest by Tuesday night. Cristobal is not the only significant storm system in town as an anomalously broad and vigorous upper trough for early June swings through the western and central U.S. the first half of the week. Severe storms should develop across the northern Plains this afternoon as a low pressure system intensifies in the Canadian Prairies. Cold air behind the low pressure system will support periods of snow across the higher elevations of the Great Basin, Intermountain region, and especially for the Bitterroot, Salmon River, and Sawtooth mountain ranges where heavy snow is possible this evening into Monday. Across the northern and central Plains, another low pressure system looks to form along a slow-moving cold front triggering additional severe storms and heavy rainfall for these areas. Meanwhile, a drier and windy pattern continues to support critical to extreme fire danger from the southern High Plains and southern Rockies to the Four Corners region through Tuesday. Temperature-wise, a strong cold front ushers in a very cool air-mass for early June across the West and will only lower the fire danger slightly across the Southwest by Tuesday. Temperatures look to be cold enough that Frost Advisories and Freeze Warnings have been posted for parts of the Great Basin and Intermountain West. While parts of the Northwest witness wintry conditions, summer heat engulfs the Plains today, then into the Upper Midwest on Monday, and into the Great Lakes by Tuesday. Farther south, triple-digit high temperatures are likely across western and central Texas on Monday. Tuesday's heat indices look to range between 100-110 across east and south Texas. Cooler and more comfortable temperatures across the Northeast today gradually warm up and become increasingly more humid Monday into Tuesday. Mullinax Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php