US Day 3-7 Hazards Outlook NWS Weather Prediction Center College Park MD 512 PM EDT Thu Apr 09 2020 Valid Sunday April 12 2020 - Thursday April 16 2020 Hazards: - Heavy rain across portions of the Mid-Atlantic, the Lower Mississippi Valley, the Central Appalachians, the Tennessee Valley, the Northeast, the Southern Appalachians, the Southeast, the Great Lakes, and the Ohio Valley, Sun-Mon, Apr 12-Apr 13. - Heavy rain across portions of the Southeast, Wed, Apr 15. - Heavy snow across portions of the Central Plains, the Central Rockies, the Southern Plains, the Southern Rockies, the Upper Mississippi Valley, and the Great Lakes, Sun-Mon, Apr 12-Apr 13. - Heavy snow across portions of the Central Plains, the Middle Mississippi Valley, and the Upper Mississippi Valley, Sun, Apr 12. - Heavy snow across portions of the Central Appalachians, Wed-Thu, Apr 15-Apr 16. - Severe weather across portions of the Lower Mississippi Valley, the Tennessee Valley, the Mid-Atlantic, the Southern Appalachians, the Southeast, and the Southern Plains, Sun, Apr 12. - Severe weather across portions of the Southeast and the Mid-Atlantic, Mon, Apr 13. - Flooding possible across portions of the Northern Plains. - Flooding occurring or imminent across portions of the Lower Mississippi Valley, the Northern Plains, the Tennessee Valley, the Middle Mississippi Valley, the Upper Mississippi Valley, the Southern Plains, and the Ohio Valley. - High winds across portions of the Central Plains, the Central Rockies, the Central Great Basin, the Northern Plains, the Northern Rockies, the Southern Rockies, the Middle Mississippi Valley, the Upper Mississippi Valley, and the Southern Plains, Sun, Apr 12. - High winds across portions of the Central Plains, the Mid-Atlantic, the Lower Mississippi Valley, the Central Appalachians, the Northern Plains, the Tennessee Valley, the Middle Mississippi Valley, the Northeast, the Southern Appalachians, the Upper Mississippi Valley, the Great Lakes, and the Ohio Valley, Mon-Tue, Apr 13-Apr 14. - Much below normal temperatures across portions of the Central Plains, the Central Rockies, the Lower Mississippi Valley, the Central Great Basin, the Northern Plains, the Great Lakes, the Northern Rockies, the Southern Rockies, the Middle Mississippi Valley, the Upper Mississippi Valley, the Southern Plains, and the Ohio Valley, Sun-Thu, Apr 12-Apr 16. - Heavy precipitation across portions of mainland Alaska, Sun-Mon, Apr 12-Apr 13. - High winds across portions of mainland Alaska, Sun-Mon, Apr 12-Apr 13. - High winds across portions of the Aleutians, Tue-Wed, Apr 14-Apr 15. - Much above normal temperatures across portions of mainland Alaska, Sun-Wed, Apr 12-Apr 15. Detailed Summary: A upper-level energy over the Rockies by Monday and upper-level energy over Northern Mexico that will extend into the Texas Panhandle will aid in producing a deep upper-level trough over the Western part of the country. The southern energy will move northeastward to the Lower Great Lakes by Monday. Furthermore, an area of cold high pressure will build southward out of Western Canada moving southward to the Northern High Plains/Northern Rockies by Tuesday. The deep trough and cold high pressure at the surface will aid in developing an area of Much Below Normal Temperatures over parts of the Rockies/Plains into parts of the Mississippi Valley, from Sunday into Thursday. By Wednesday and Thursday the air mass will moderate so the Below Normal Temperatures will start to wane. The upper-level energy and upslope flow will aid in developing areas of Heavy Snow over the Central/Southern Rockies Sunday into Wednesday. Meanwhile, upper-level energy over Northern Mexico on Sunday will move northeastward to the Lower Great Lakes by Monday. An accompanying surface low over the Southern High Plains, Sunday, will roughly move northeastward to the Great Lakes by Monday and into Southeastern Canada by Tuesday. The accompanying front and moisture pooling along the boundary will aid in producing an area of Heavy Precipitation over parts of the Lower Mississippi/Tennessee Valleys into the Mid-Atlantic/Southeast on Sunday moving into parts of New England on Monday. Additional Heavy Rain will linger near the boundary over Florida on Tuesday into Wednesday. The dynamic system will aid in making the atmosphere unstable resulting in severe thunderstorms over the Central Gulf Coast eastward to the Southeast through Monday. In Alaska, An upper-level ridging over the mainland on Sunday will as far north as the Far North on Sunday and again by Tuesday into Wednesday. The upper-level ridging will aid in producing and area of Much Above Normal Temperatures over parts of the Far North, likewise on Sunday into Wednesday. Additionally, Low pressure over the North Pacific will move into the Western Aleutians on Sunday. Another area of low pressure over the North Pacific on Tuesday will consolidate into one are of low pressure a long the southern edge of the Central Aleutians on Wednesday into Thursday. The developing strong pressure gradient will aid in producing an area of High Wind over the Aleutians on Tuesday into Wednesday. Low pressure and the associated front along with an accompanying plume of moisture will aid in producing an area of Heavy Precipitation over parts of eastern Kenai Peninsula, Kodiak Island, and Northern portion of the Alaska Peninsula on Sunday into Monday. The strong pressure gradient associated with the front and area of low pressure will aid in producing high wind over Kodiak Island Sunday into Monday. Ziegenfelder