Friday, October 21, 2016

Mt. Hopkins Follow-Up

The forecast above was from the 12 UTC WRF-GFS yesterday morning and was valid at noon. The easterly wind layer apparently remained very shallow through this event and did not reach high enough to force high winds at Mt. Hopkins. The max gust up there yesterday was only 31 mph, while the airport reached 30 mph. Early this morning the airport was still having gusts to around 30 mph, while wind had diminshed to only 15 mph. An interesting situation that may indicate that easterlies need to be as deep as the mountain massif, i.e., reach to around 700 mb if a high wind situation is to develop. The grid point forecasts were quite good, see previous post, although gusty winds at airport have continued longer than were forecast.

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