Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 424 PM EDT Tue Oct 22 2013 Valid 00Z Wed Oct 23 2013 - 00Z Fri Oct 25 2013 ...Dry and warm across the West... ...Unseasonably cold from the Great Lakes-Northeast to the Southeast... ...Lake-effect precipitation developing in the lee of the Great Lakes... ...Showers and thunderstorms moving slowly south across Florida... From the Rockies westward, conditions are expected to remain dry with seasonal to above average temperatures under an amplified upper ridge that is forecast to remain largely intact across the region over the next couple of days. Further to the east however the story is quite different, with deep cyclonic flow providing the avenue for a number of weak disturbances and reinforcing shots of cold air to move through the eastern half of the U.S. One of these disturbances is expected to deliver light to moderate precipitation as it moves from the mid Mississippi valley through the Ohio valley overnight. In is wake, cold Canadian high pressure is forecast to settle into the region, with widespread frost advisories and freeze watches hoisted for parts of the central and southern Appalachians back toward the mid Mississippi valley. As the aforementioned upper disturbance nears the mid Atlantic coast early tomorrow, an area of low pressure along a stalled surface front will develop further as it lifts to the north along the mid Atlantic to the Northeast coasts tomorrow. This may produce some organized light to moderate precipitation along the immediate coast before the system moves south of the Canadian Maritimes Wed evening. Meanwhile, unseasonably cold air will continue to spread across the East. This cold air moving across the warm Great Lakes will result in lake effect showers downwind of the lakes, some of which will fall in the form of snow. Across Florida, expect showers and thunderstorms to center near a slow moving front dropping south across the state. Pereira Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php