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Tropical Storm Bertha developed extremely quickly this morning, and is expected to bring heavy rainfall and potential flash flooding across portions of eastern and central South Carolina and southwest Virginia. Tropical storm force winds are expected in portions of the South Carolina coast before weakening tonight. A Tropical Storm Warning is in effect for coastal South Carolina. 

Tropical Storm Arthur will continue to track east away from the North Carolina Outer Banks. However, dangerous coastal surf conditions and rip currents are forecast to spread north along the Mid-Atlantic Coast and persist during the next couple of days. Meanwhile, a slow moving storm in the East will bring heavy rain and the potential for flash flooding from Ohio to the Southeast. In the West, another storm will bring locally heavy rain with higher elevation snows to the Inter-mountain West. In the High Plains, storms could become severe. Windy and dry conditions are keeping fire weather threats critical in the Southwest and Four-Corners areas. States with Active Advisories: California, Nevada 

State breakdown below:

California - Winter Weather Advisory - Sierra. 1-3 inches of additional snow until 5pm today, impacting the Sierra Nevada passes.

Nevada - Winter Weather Advisory - Central. 1-2 inches of valley snow and up to 6 inches of mountain snow through 11 AM PDT today.

Our first of the season,  Tropical Storm Arthur, will bring locally heavy rainfall and gusty winds along the North Carolina Coast today, with rough surf and dangerous rip currents throughout the Mid Atlantic. Meanwhile, a slow-moving cold front will bring several days of heavy rainfall from the Ohio Valley to southern Appalachians, which will bring an elevated risk for both flash flooding and river flooding into mid week. States with Active Advisories: North Carolina, California (Winter)

State breakdown below:

California - Winter Storm Warning - Sierras. 3-6 inches of snow with localized amounts up to 13 inches until midnight. Expected to impact transit including along I-80. 

North Carolina - Tropical Storm Warning - Coastal from Surf City to Duck. 30-40mph winds with gusts up to 55mph, 2 foot storm surge, and localized flooding. Further inland, conditions are somewhat favorable for tornadoes. 

Arthur is currently centered 100 miles south-southwest of Cape Hatteras, North Carolina, and is moving to the North-Northeast. It marks the sixth consecutive hurricane season that has started early, prior to June 1st. 

Strong to severe thunderstorms with hail, winds and heavy rain are expected from southeast Texas to southern Mississippi. Elevated fire weather threats are likely across the Southeast, Upper Mississippi Valley and Southern High Plains, due to dry conditions and gusty winds. Expect above normal temperatures in the West and well below normal temperatures in the East, Midwest and South this weekend. Some wet snow is likely Friday night and Saturday in the interior Northeast, which could include rare May lake-effect snow in some of the Great Lakes snowbelts. Low pressure could undergo bombogenesis along the New England coast. States with Active Advisories: North Dakota, Maine

State breakdown below: 

North Dakota - Winter Weather Advisory - North Central. 1-3 inches of snow and winds gusting at 35mph from 4 AM to 3 PM CDT Saturday.

Maine - Winter Weather Advisory - North. 4-6 inches of snow and winds gusting at 35mph From 2 AM Saturday to 2 AM EDT Sunday.

High Winds are present in parts of New Mexico, Texas, Kansas, Oklahoma, Missouri, Arkansas, Louisiana, Illinois, Kentucky, Tennessee, Mississippi, and Alabama.

In addition to unseasonably cold weather in the eastern US, a system is expected to drop into the south-central Plains and Mid to Lower Mississippi Valley to produce strong to severe thunderstorms and locally heavy rainfall. The storms may contain large hail and gusty winds, while the rain may yield some flash flood concerns. Some wet snow is likely Friday night and Saturday in the interior Northeast, which could include rare May lake-effect snow in some of the Great Lakes snowbelts. States with Active Advisories: Montana

Montana - Winter Weather Advisory - Central. 2-4 inches of additional snow above 5500ft and winds gusting up to 40mph Until noon MDT today.