Chelan, WA 14 Day Weather

Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 321 PM EDT Wed Sep 22 2021 Valid Thu Sep 23 2021 - Sat Sep 25 2021 ...Widespread heavy rain, localized severe weather to transpire with areas of flooding likely from the Great Lakes to the northern Mid-Atlantic this evening; Moderate Risks for Excessive Rainfall are posted... ...Swath of heavy showers and thunderstorms reaches the Northeast on Thursday; hazards such as flash flooding and severe weather are possible... ...Autumn-like temperatures in the South and Northern Plains; the West Coast gradually warms up the second half of the week... All eyes are on a strengthening area of low pressure located in the Ohio Valley this afternoon. This storm system is intensifying thanks to a deepening upper level low tracking through the Lower Great Lakes region. This wave of low pressure is responsible for ongoing showers and thunderstorms up and down the East Coast and as far west as the eastern Corn Belt. Thunderstorms will be severe at times from the Ohio Valley on south into the Carolinas with damaging wind gusts, large hail, and tornadoes all possible. In addition, a rich feed of tropical moisture accompanied within a robust southerly wind field aloft supports Excessive Rainfall rates within heavy showers and thunderstorms in advance of, and along, an advancing cold front. This has led to the issuance of two Moderate Risks for Excessive Rainfall; one in the central Appalachians and one in portions of the Lower Great Lakes. Heavy rainfall rates leading to areas of flash flooding is also a concern in the northern Mid-Atlantic where soil moisture anomalies remain overly saturated versus normal for parts of the region. This has resulted in Flash Flood Watches being issued in these aforementioned areas, including for some of the major markets of the northern Mid-Atlantic. On the back side of the storm, periods of moderate-to-heavy rainfall is likely to produce areas of flash flooding in the lower Great Lakes this evening. Rapid runoff, fast rising creeks and streams, and urbanized flash flooding are all expected to occur where the most intense rainfall rates take shape. As the low occludes over the Great Lakes tonight and into Thursday, the cold front will gradually push east, shifting the focus for heavier rainfall into the Northeast on Thursday. A Slight Risk for Excessive Rainfall remains in place from the northern DelMarVa Peninsula and Delaware Valley on north into the interior Northeast. The front's slow progression will keep rounds of heavy showers and thunderstorms in the forecast across much of New England on Friday, where a Marginal Risk for Excessive Rainfall is in place. Farther south, the trailing end of the cold front comes to a crawling speed over central Florida, leading to daily rounds of strong thunderstorms capable of producing locally heavy downpours over South Florida both Thursday and Friday. Behind the front, high pressure and dry conditions look to stick around throughout the Nation's Heartland Thursday and into Friday. Farther west, a relatively dry cold front brings a reinforcing shot of autumn-like temperatures to parts of the northern Rockies on Thursday, then into the Northern Plains on Friday. Seasonally cooler temperatures and more refreshing humidity levels engulf much of the South, while the West Coast heats up as a ridge of high pressure aloft builds in by Friday. Mullinax Graphics are available at www.wpc.ncep.noaa.gov/basicwx/basicwx ndfd.php
Storm Prediction Center
United States 2 Day Forecast
WPC Short Range Forecasts (Days ½-2½)