On Friday, low pressure over the southern Texas Coast will move northeastward to the Western Ohio Valley by Sunday.
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A deep upper-level low over North-Central Mexico is associated with the surface low over the Western Gulf Coast.
The circulation around the upper-level low will aid in streaming moisture off the Western Gulf of Mexico, producing showers and thunderstorms over the Southern Plains with heavy rain.
Therefore, the WPC has issued a Moderate Risk of excessive rainfall over parts of the Western Gulf Coast through Saturday morning.
The associated heavy rain will create numerous areas of flash flooding.
Furthermore, many streams may flood, potentially affecting larger rivers.
On Saturday, the excessive rainfall threat will reduce two categories to a Marginal Risk of excessive rainfall over the Lower Mississippi Valley and Central Gulf Coast.
The associated heavy rain will create localized areas of flash flooding, affecting areas that experience rapid runoff with heavy rain.
Moreover, temperatures will be 10 to 30 degrees below average under the upper-level low under the Southern High Plains.
The moisture that will intersect with the cold temperatures will produce areas of heavy snow over parts of western Texas and the Southern High Plains on Friday, ending on Saturday morning.
The snow will result in reduced visibility and hazardous driving conditions.
Therefore, the snow has prompted Winter Storm Warnings and Winter Weather Advisories through Saturday.
Meanwhile, upper-level energy and the associated front will move across the Lower Great Lakes/Ohio Valley into the Northeast, moving off the East Coast by Friday afternoon.
The system will produce an area of light snow over parts of the higher elevations of Northern New England on Friday.
In addition, some areas of northern Maine will experience patches of rain/freezing rain.
The front will also produce rain over parts of the Northeast/Mid-Atlantic to the Ohio and Tennessee Valleys and the Southeast, ending by late Friday night.
Elsewhere, a front over the Pacific Northwest will move eastward to the Great Lakes/Ohio Valley by Sunday.
The Storm will produce rain and snow over the higher elevation of the Pacific Northwest through Saturday morning.
In addition, snow will develop over parts of the Northern Intermountain Region into the Northern Rockies overnight Friday into Saturday.
Furthermore, another front will move onshore on Sunday over the Pacific Northwest, producing more rain and higher-elevation snow. ■
A hyperactive weather pattern will bring an expansive low pressure system across mainland U.S., resulting in widespread impactful weather to progress from west to east across the country through the next few days.