Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 AM EDT Tue Mar 10 2020 Valid 12Z Tue Mar 10 2020 - 12Z Thu Mar 12 2020 ...There is a slight risk of excessive rainfall for parts of Southern California from Tuesday into Wednesday morning and over parts of Arizona on Wednesday into Thursday morning... ...There is a possibility extensive possible record high low temperatures from the Ohio Valley to the Northeast... Over California, an occluded surface low over the eastern Pacific will slowly track eastward through Thursday and approach southern California. Rain and high mountain snow will increase as the cold front approaches the coast, mainly for the southern half of the state. With areal rainfall amounts of one half to one inch in lower elevations, and one to three inches for favored mountain areas, some instances of flooding will be possible, and therefore WPC maintains a Slight Risk for Excessive Rainfall on Tuesday. This moisture then reach Arizona by Wednesday with rounds of moderate to locally heavy rain expected across central portions of the state Likewise, the WPC maintains a Slight Risk for Excessive Rainfall on Wednesday into Thursday morning over parts of Arizona. A frontal boundary currently over the Lower Great Lakes southwestward into the Lower Mississippi Valley and Southern Plains will continue to advance southeastward and reach the East Coast by Tuesday night. This will serve as a focus for periods of light to moderate rain from the Central Gulf Coast, Tennessee Valley, Ohio Valley, and into the Great Lakes. Mixed precipitation will be likely over Northern Maine, which will be north of the main frontal boundary, and rain elsewhere for most of the Northeast U.S. Temperatures will be above average ahead of the front with 60s and 70s for highs being widespread. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php