EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 1231 AM EST SAT MAR 07 2015 VALID 12Z TUE MAR 10 2015 - 12Z SAT MAR 14 2015 THE GLOBAL NUMERICAL GUIDANCE INDICATES THAT THE FLOW IS IN FLUX ACROSS CENTRAL NORTH AMERICA AT THE MEDIUM RANGE, WITH CHANGES FROM THE SHORT RANGE UNDONE BY THE TIME DAY 7 ROLLS AROUND. STUCK WITH THE ENSEMBLE MEANS FOR THIS VOLATILE REGIME, WHICH SHOW ENOUGH OF A RELAXING OF THE NORTHERN STREAM TO ALLOW WIDESPREAD PRECIPITATION TO BREAK OUT FROM THE GULF OF MEXICO TO THE OHIO VALLEY AND MID-ATLANTIC--MOSTLY IN THE FORM OF RAIN. THE WEST COAST IS WETTEST DAYS 4 AND 5, WITH THE TENDENCY TOWARD RIDGING ONCE AGAIN SHUTTING DOWN THE PRECIPITATION DAYS 6 AND 7. MUCH OF THE NATION WILL BE MILD UNTIL LATE IN THE PERIOD WHEN A SPRAWLING SURFACE HIGH BUILDS ACROSS SOUTHEASTERN CANADA AND FEEDS COLD AIR BACK INTO THE BORDER STATES. CISCO