WEATHER SUMMARY AND FORECAST DETAILS
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For 3/20/2023 - from Medford NWS
An upper low will move south into northern California tonight into Tuesday. Most of the ECMWF and GEFS forecast models individual ensemble members, and the operational models take most, if not all of the precipitation south of our area. Could not rule out isolated showers in southern Siskiyou and Modoc county Tuesday afternoon, but that`s about it. Elsewhere it should remain dry. Tuesday night, some wraparound moisture could make it`s way into northern Cal from eastern Siskiyou County into portions of Modoc county, but precipitation amounts should be light, otherwise we should remain dry over the rest of the area.
Wednesday, weak forcing in association with an approaching weak upper trough along with daytime heating will result in isolated showers developing in the afternoon. Showers will persist Wednesday night, mainly along and west of the Cascades. Another upper trough will approach from the northwest and a surface cold front will reach the coast Thursday afternoon. A cold air mass will follow Thursday night with a moist northwest flow with an upper low remaining north of the area. Showers will continue Thursday night with snow levels coming down to around 2000 feet by early Friday morning. It`s not out of the question there could be snow showers over the passes north Grants Pass on I-5, Hay`s and Jacksonville Hills` but road temperatures are likely to be warm enough where snow showers will just end up melting on the roads. All signs are pointing towards a continuation of cool and unsettled weather Friday through at least the middle of next week with systems dropping in from the Gulf of Alaska. This is being supported by output from the various forecast model ensembles.
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