May 20, 2013
(THURSDAY THROUGH MONDAY)...ALTHOUGH THERE REMAINS SOME DIFFERENCES WITHIN THE DETAILS OF THE MODELS...A VERY COLD AND DRY FORECAST APPEARS LIKELY THROUGH THIS TIME WITH TEMPERATURES PLUMMETING TO WELL BELOW NORMAL. ALOFT...THE MODELS ALL INDICATE A VERY BROAD TROUGH WITH SEVERAL EMBEDDED SHORTWAVES REMAINING OVER THE EASTERN HALF OF THE COUNTRY AND A RIDGE AXIS EXTENDING NORTH ALONG THE WEST COAST. AT THE SURFACE...THE PERIOD WILL BEGIN WITH A 1040-1050MB HIGH DROPPING SOUTH OUT OF CANADA TOWARD OUR REGION...THEN EAST TOWARD THE SOUTHEAST COAST BY THE END OF THE WEEKEND. THE 00Z MEX CONTINUES TO INDICATE WELL BELOW NORMAL TEMPERATURES THROUGH THE WEEKEND WITH OVERNIGHT LOWS RANGING FROM 20-25 DEGREES AND ONLY CLIMBING INTO THE LOW TO MID 50S DURING THE AFTERNOON HOURS. AT THIS TIME...THE COLDEST TWO MORNINGS OF THE PERIOD WILL BE FRIDAY AND SATURDAY MORNINGS. TOWARD THE END OF THIS PERIOD...SUNDAY INTO MONDAY...THE GUIDANCE SUGGESTS A SLIGHT WARMING TREND BACK TOWARD NORMAL.
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