WEATHER SUMMARY AND FORECAST DETAILS
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FROM MEDFORD NWS 6/20
Today is the last day of seasonal spring. Seasonal summer starts tomorrow. The low that created the clouds, showers, and thunderstorms yesterday moves eastward today. An upper level shortwave will bring energy to the area. Forecast models are supporting a few isolated thunderstorms in southern Lake County and portions of Siskiyou and Modoc counties in the afternoon. This will be less coverage than yesterday's activity, and there will be a drier trend after. Breezy northwest winds will also come this afternoon. A ridge will build over the Pacific Ocean, and will begin impacting our area tomorrow. A thermal trough will bring warmer temperatures near 80 to the Brookings area tomorrow afternoon. Inland, upper 80s and 90s are forecast west of the Cascades with low/mid-80s east.
Monday onward, the flow pattern becomes more zonal for the start of next week as temperatures begin to warm. A thermal trough will likely develop west of the Cascades by Sunday night into Monday and persist into Tuesday. High temperatures in Medford will approach the 100 degree mark on both Monday and Tuesday. Heat risk becomes elevated/moderate during these days as low temperatures cool into the lower 60`s. As a reminder, moderate heat risk affects those who are sensitive to heat, especially those without cooling. On a side note, the extreme forecast index(EFI) is showing values around 0.7-0.85 for maximum temperatures through Thursday west of the Cascades. These values suggest the ensembles are forecasting unusually warm temperatures for this time of year, yet by no means extreme. Conditions will begin to cool down by Thursday and Friday.
