US Day 3-7 Hazards Outlook NWS Weather Prediction Center College Park MD 318 PM EST Wed Feb 06 2019 Valid Saturday February 09 2019 - Wednesday February 13 2019 Hazards: Heavy precipitation across portions of the Central Great Basin, California, and the Southwest, Wed, Feb 13. Heavy rain across portions of the Middle Mississippi Valley, the Lower Mississippi Valley, the Southern Plains, the Ohio Valley, and the Tennessee Valley, Sun-Wed, Feb 10-Feb 13. Heavy rain across portions of the Northeast, the Tennessee Valley, the Mid-Atlantic, the Southern Appalachians, the Southeast, and the Ohio Valley, Wed, Feb 13. Heavy snow across portions of California, the Central Great Basin, the Pacific Northwest, and the Northern Great Basin, Sat-Sun, Feb 9-Feb 10. Flooding possible across portions of the Lower Mississippi Valley, the Tennessee Valley, the Middle Mississippi Valley, the Upper Mississippi Valley, the Great Lakes, and the Ohio Valley. Flooding occurring or imminent across portions of the Middle Mississippi Valley and the Great Lakes. Much below normal temperatures across portions of the Central Plains, the Northern Plains, the Northern Rockies, the Middle Mississippi Valley, the Northern Great Basin, the Upper Mississippi Valley, and the Pacific Northwest, Sat-Tue, Feb 9-Feb 12. Heavy snow across portions of mainland Alaska, Mon, Feb 11. Heavy snow across portions of mainland Alaska, Wed, Feb 13. High winds across portions of mainland Alaska, Tue, Feb 12. High winds across portions of the Aleutians, Mon, Feb 11. and Wed, Feb13. High significant wave heights for coastal portions of the Aleutians, Sat-Sun, Feb 9-Feb 10. and Mon-Tue, Feb 11-Feb 12. Detailed Summary: A synoptic pattern that favors mild temperatures along the East Coast and arctic air intrusion over the Northern Plains will support a general storm track from the Central Plains toward the Great Lakes through next Tuesday. This will promote wintry weather from the Northern Plains to the Great Lakes, and heavy rain from the Middle Mississippi Valley to the Ohio Valley. Arctic air from the Plains will then usher into the East Coast, as cold high pressure from West-Central Canada moves southeastward to the Great Lakes by Saturday evening. Much below normal temperatures will continue across the Northern Plains through next Wednesday. Meanwhile, moisture surging northward from the Gulf of Mexico together with strong upper-level dynamics will support the possibility of heavy rain over parts of the Northeast on Friday as the strong cold front approaches. Another arctic front is forecast to form across the Northern High Plains by Saturday that will move southeastward to the Middle Mississippi and Ohio Valleys by Monday. The next low pressure system will develop along this arctic front on Tuesday over the Central High Plains that will move northeastward to the Great Lakes by Wednesday. Southerly flow from the Gulf will once again bring increasing moisture and mild temperatures from the Gulf Coast States to the Southeast Tuesday into Wednesday. The Middle Mississippi Valley and Lower Mississippi Valley into parts of the Southern Plains will once again appear to be the focus for heavy rainfall ahead of the arctic cold front and the developing low pressure system. The Western U.S. should see heavy snow moving across the Sierra Nevada overnight Friday into Saturday a couple of energetic upper troughs move across the southwestern U.S.. Temperatures will be colder than normal over much of the Western U.S. through Wednesday. In Alaska, deep low pressure in the Bering Straits on Saturday and again on Thursday will produce strong wind of 50 knots or more and high seas over 20 feet or greater over parts of the Aleutian Islands. On another note, a developing upper-level low north of Hawaii on Saturday will aid in forming a surface low by Sunday that will move just north of the Islands by Sunday. The low will aid in developing waves up to 30 feet and strong wind of 30 to 40 knots Sunday into Monday. Can anyone say surf is up? Ziegenfelder