By Winn Soldani

It’s always good to have an adult in the room, and our good friend, Chris Bedford, noted something in my write up of KPVD yesterday and I thought I would share his insight with everyone.

  1. The wind roses that we used below were from all the way back to 1942.  This predates automated data collection and in fact was less precise than modern collection.  In the pre-ASOS (the automated sensors used today) manual observers would collect the data using the 16 compass points.

    Using a dataset that goes back that far biases the data towards the 16 compass points (you can see vestiges of this in the wind rose in yesterday’s blog post).


    A better approach is to use wind roses only from the “modern” era, which I will post below after another point…

  2. I got a little too precise time-wise–both in PVD and ORD–by posting the wind rose for only the few days we’re forecasting for.  A broader perspective–perhaps a month, maybe even two in transitional times–makes more sense.

Chris was kind enough to send the roses using modern period data, and for the months of May and June.  You can see May–with some southerly NE/NNE winds and some southerlies (likely as sea breeze “season” starts).  Then, below is the June rose, where you can see that we’re definitely in sea breeze season with southerlies, off of the ocean/bay, quite common!

may pvd rose


june pvd rose


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