Heavy rains, isolated flash flooding for portions of central tosouthern California, while heavy snows likely in the Sierra.Record low maximum temperatures possible across Southern California andthe Southwest this weekend.Heavy snows possible Friday night into early Saturday across northernMaine.Wintry weather to spread eastward this weekend from the NorthernRockies into the Northern Plains.Much above average temperatures for the Easter weekend from the Centralto Southern Plains, east across the Mid to Lower Mississippi Valley, OhioValley and into the Southeast...A cold and wet weather pattern on tap for the Easter weekend across muchof California into the Southwest.  An area of low pressure currently offthe northern California coast will be sinking slowly southeastward alongthe central to southern California coast over the next two days.  This lowwill produce the potential for widespread heavy rains along the central tosouthern California coastal regions, along with the potential for isolatedflash flooding.  Flood watches are currently in effect across portions ofcoastal southern California from north and east of San Diego, northwardthrough the LA metro region, including the Transverse range.  While heavyrains occur along the coastal areas of central to southern California,heavy snows are likely through much of the Sierra where 1 to 2 feet arepossible.  Locally heavy snows will also be likely farther inland from theMogollon Rim of Arizona, into the Wasatch of Utah, the Rockies of Wyomingand across the higher terrain of the Nevada Great Basin as this systempushes eastward this weekend.  In addition to the wet weather acrosssouthern California, high temperatures are expected to be much belowaverage both Saturday and Sunday, with the potential for record lowmaximum temperatures across the Los Angeles to San Diego metro areas. Much below average temperatures also expected across much of the GreatBasin, Southwest and Northern Plains this weekend.Warmer more spring like temperatures are on tap from the Southern toCentral Plains, eastward across the Middle to Lower Mississippi Valley,Ohio Valley and the Southeast.  Across these regions, high temperaturesare expected to be 10 to 20 degrees above average.Winter weather will be hanging on across portions of northern Maine lateFriday into early Saturday as a strong low moves slowly northward to theeast of Maine across the Canadian maritimes.  Early Spring heavy snows arepossible across northern Maine with accumulation in the 4 to 6 inch rangeforecast.  A fast moving area of low pressure moving west to east fromIowa into the L.P. of Michigan Friday night into Saturday will produce anarea of 2-4" snows well to its north from the Arrowhead of Minnesota intothe U.P. of Michigan.An expanding area of wintry weather is also expected to push eastward fromthe Northern Rockies Saturday and into the Northern Plains on Sunday.  Theheaviest snow accumulations are expected over portions of the NorthernRockies with generally light totals pushing east into the High Plains.