Hi HB,

In case you are interested, here is a comparison of the thermal progression so far for this year compared to expectations for 2020 based on the last 50 years. You can see the flattening and divergence due to cool temperatures during the last week and expected for the next week.

Matt

From: Matthew P. Ayres
Sent: Monday, May 4, 2020 22:05
To: Hubbardbrook@lists.sr.unh.edu
Subject: Updated leaf-out forecast for Hubbard Brook

Hi HB,

Even more good news if you were hoping for a late spring. The last week has been cooler than forecast and the next 10 days are forecast to be much cooler than average for these dates. As a result, the updated spring forecast for budburst on the Main bird plot has slipped back a whopping 6 days since last week to 21 May.

Based on our current best phenology models (after Lany et al. 2015), temperatures to date this year, and the 10-day forecast as of 5 May 2020, predictions for budburst on the Main bird plot (490 m asl) are:

· Budburst = 21 May,

· 90% completion of leaf expansion = 31 May,

· Median date of arrival and first clutch initiation for Black-throated Blue Warblers = 13 May and 4 June, respectively.

More details in enclosure.

If the current budburst prediction is accurate, it will be about 9 days later than that expected for 2020 (below and page 2 in enclosure).

Feel free to share this with anyone who may be interested. We will aim to provide weekly updates of the forecasts.

Matt