US Day 3-7 Hazards Outlook NWS Weather Prediction Center College Park MD 411 PM EDT Tue Jun 02 2020 Valid Friday June 05 2020 - Tuesday June 09 2020 Hazards: - Heavy rain across portions of the Middle/Lower Mississippi Valley, the Ohio/Tennessee Valleys, the Southeast, and the Southern Plains, Mon-Tue, Jun 8-Jun 9. - Heavy rain across portions of the Southeast, and the Lower Mississippi Valley, Sat-Mon, Jun 6-Jun 8. - Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Northern Plains, the Northern Rockies, the Middle Mississippi Valley, the Mid-Atlantic, the Northern Great Basin, the Southeast, the Great Lakes, and the Ohio Valley. - Flooding likely across portions of the Middle Mississippi Valley and the Northern Rockies. - Much above normal temperatures across portions of the Central/Southern Plains, the Northern/Central Great Basin, and the Northern/Central Rockies, Fri, Jun 5. - Much above normal temperatures across portions of the Central Rockies, and the Central/Southern Plains, Sat-Mon, Jun 6-Jun 8. Detailed Summary: The medium-range period (Thu Jun 4 - Mon Jun 8) will begin with much above normal temperatures over the interior western U.S. extending eastward into the central and southern High Plains under an upper ridge of high pressure. High temperatures over this area are forecast to reach the century mark Thursday and Friday. By the weekend, the much above normal temperatures should be confined to the central and southern High Plains as a large cool air mass works its way through the northwestern U.S., behind a cold front. Cool rain will tend to be focused along the Cascades together with the possibility of wet snow across the higher elevations of the Pacific Northwest and into the Intermountain region. Meanwhile, summer-like heat and humidity is expected to overspread much of the eastern U.S. Thursday through Saturday. By Sunday, a cold front is expected to bring down cooler and drier air from eastern Canada, ending the heat along much of the East Coast for early next week. Perhaps the area that warrants growing concerns during the medium-range period is in the Gulf of Mexico, where the National Hurricane Center has been monitoring newly formed Tropical Storm Cristobal. Models project that Cristobal will continue to track northward into the central part of the Gulf of Mexico in the short range. Although the exact track of this system is highly uncertain at this point, its relative large size means that many areas along the Gulf Coast will see an increasing threat of heavy rain toward the end of this week. This includes areas from eastern Texas through the central Gulf states to all of Florida including portions of the Southeast. The heavy rain may extend farther inland west of the lower and middle Mississippi Valley depending on the track and forward motion of the tropical system. Heavy rain may continue to spread further east across the northeast and southern New England toward the end of the medium range period, but this is still highly uncertain based on the variance of current model guidance. Elsewhere in the U.S., precipitation will generally be below heavy rain criteria through the medium-range period. However, bouts of showers and thunderstorms can be expected across the northern tier states due to occasional frontal passages. Over Alaska, relatively quiet weather is in store through the medium-range period. Much warmer than normal temperatures across the northwestern part of the state will gradually moderate. However, ice jam flooding remains a concern over the North Slope as rivers have not yet broken up, while minor snowmelt flooding is a possibility in central and southern parts of the mainland. Farther south, some terrain-influenced/enhanced precipitation is expected to linger across southern Alaska, where wet snow is possible for the higher elevations. Precipitation amounts are not expected to be heavy. Fire potential will remain low to moderate in southern Alaska due to the rain, but increased thunderstorm potential, particularly north of the Alaska Range, along heat troughs running through mainland Alaska compounded by favorable fuels could produce a number of starts. Kebede/Kong