US Day 3-7 Hazards Outlook NWS Weather Prediction Center College Park MD 350 PM EDT Fri Mar 27 2020 Valid Monday March 30 2020 - Friday April 03 2020 Hazards: - Heavy precipitation across portions of California, the Pacific Northwest, and the Northern Great Basin, Mon, Mar 30. - Heavy rain across portions of the Lower/Middle Mississippi Valley, the Tennessee Valley, the Mid-Atlantic, the Southern Appalachians, the Southeast, the Southern Plains, and the Ohio Valley, Mon-Tue, Mar 30-Mar 31. - Heavy snow across portions of the Northern Plains, the Northern Rockies, and the Northern Great Basin, Mon-Tue, Mar 30-Mar 31. - Heavy snow across portions of the Northeast, Mon, Mar 30. - Flooding possible across portions of the Great Lakes, the Middle/Upper Mississippi Valley, the Southern Plains, and the Northern Plains. - Flooding occurring or imminent across portions of the Middle/Lower Mississippi Valley, the Northern Plains, the Tennessee Valley, the Southeast, the Southern Plains, and the Ohio Valley. - Flooding likely across portions of the Middle Mississippi Valley, the Upper Mississippi Valley, and the Northern Plains. - Much above normal temperatures across portions of the Upper Mississippi Valley and the Northern Plains, Mon, Mar 30. - Much above normal temperatures across portions of the Southeast, Mon-Tue, Mar 30-Mar 31. - Enhanced wildfire risk across portions of the the Southern Plains, Mon, Mar 30. - Heavy precipitation across portions of mainland Alaska and the Aleutians, Wed-Thu, Apr 1-Apr 2. - High winds across portions of the Alaska Panhandle and mainland Alaska, Mon, Mar 30. - Much below normal temperatures across portions of mainland Alaska, Mon-Tue, Mar 30-Mar 31. Detailed Summary: At the beginning of the medium range period (Monday 3/30), a low pressure system is forecast to redevelop over or just offshore of Cape Cod. In this pattern, precipitation is likely for the Northeast, and much of the precipitation should be in the form of snow for interior New England. Much of Maine and northern New Hampshire in particular could receive a good amount of snow for a late season storm. Upper-level troughing is expected to move fairly quickly across the country during the first half of the workweek, from the Four Corners/Southwest Monday into the Mississippi Valley Tuesday and the Appalachians Wednesday. Ample Gulf moisture will flow into the vicinity of a surface low just ahead of this trough, causing the possibility of heavy rain and potential for flooding and flash flooding despite the quick movement of the system. The southeastern quadrant of the country, from portions of the Southern Plains to the Lower/Middle Mississippi and Tennessee Valleys and Southeast could experience this, but the exact axis of the heaviest precipitation will continue to be refined over the coming days. Over the Northwest, precipitation is possible through the medium-range period, but the heaviest amounts are forecast toward the beginning of the workweek. In the Pacific Northwest, rain is expected along the coast with higher elevations of the Cascades receiving potentially heavy snow. Additionally, heavy snow could occur in higher elevations of the Northern Rockies into the Wind River Range/Tetons. Temperature-wise, warmth should continue into the early part of next week for Florida. Record highs could be set Monday and Tuesday, with temperatures and heat indices over 90 degrees. The north-central tier of the nation is also expected to warm up by early next week, particularly Monday, and a hazard area was drawn where these relatively warm temperatures could lead to snowmelt. In Alaska, colder than normal conditions could persist from the short range especially for the southeastern part of the state, moderating some by midweek. The North Slope, on the other hand, can expect warmer than normal temperatures next week. On Monday, a tight pressure gradient across the Panhandle could lead to gap winds in favored areas, which could impact transportation. Then, model guidance is indicating the possibility for heavy precipitation for portions of the Alaska Peninsula and the southwestern mainland later in the week. Uncertainty remains regarding exact timing and placement of the precipitation, but a hazard area was drawn to outline the potential. Tate