John (and others), For the easternmost third of North America, 850hPa can be too high, that's true. Looking at a level like 950 or 925hPa would be really useful for you in Nova Scotia (or any coastal location). Yet this isn't available on earth.nullschool.net. If you wanted to see the different levels of winds between 1000hPa and 850hPa, you could go to windy.com <https://www.windy.com/-Cloud-base-cbase?950h,cbase,44.719,-63.812,6>. Here you can adjust vertical levels with a little more granularity AND you can also turn on cloud bases which would be helpful for NFC predictions (lower cloud bases = better probability of hearing calls). You cannot, however, go backwards in time (as far as I know) to see previous dates that were of interest to you.
Overall, the forecasted winds from computer models can be useful for prediction of migration changes as well as when concentrations of birds will be higher in a given area or not. What Chris had the other day <https://earth.nullschool.net/#2020/09/18/0300Z/wind/isobaric/850hPa/orthographic=-77.30,42.81,960/loc=-76.383,42.485> was a great example of the winds coming from an appropriate origin, a large scale convergence pattern for his area, and likely lower cloud bases with the passage of the weak cold front. The speed of the front helped as well, making the event last longer over his area as birds were likely piled up at the frontal boundary itself since the wind shift on the opposite side of the front was not conducive for migrants. Thanks, Bryan Bryan Guarente Meteorologist/Instructional Designer UCAR/The COMET Program Boulder, CO On Fri, Oct 2, 2020 at 11:26 AM John Kearney <john.kear...@ns.sympatico.ca> wrote: > I have often used the earth.nullschool streams to understand bird > migration movements. However, here in coastal Nova Scotia many birds, > mainly passerines, fly well above 1000 hpa and well below 850 hpa altitudes > (the choices available in nullschool streams). The HYSPLIT models often > provide more insight into passerine and small passerine movements at these > intermediate altitudes between 100 and 1500 meters. I have only analyzed > past events and never tried forecasting. > > John Kearney > > Yarmouth, Nova Scotia > > > > *From:* bounce-3195061-53237...@mm.list.cornell.edu *On Behalf Of *Bryan > Guarente > *Sent:* Thursday, October 01, 2020 20:56 > *To:* Night Flight Call Discussions <nfc-l@mm.list.cornell.edu> > *Subject:* Re: [nfc-l] Epic Movement - Etna, NY > > > > Lee and others, > > I didn't see this at the time because it unfortunately went to spam. > > > > The website earth.nullschool.net is available for anyone to use and gives > computer modeled streamlines that can help with predicting migration > patterns. It is best to look at the 850hPa (mb) level when looking for > migrational movements away from taller topography. There is a lot more to > it than that, but Chris's example was a really good one to use. On that > website, you have the ability to go back in time to Dec 31 of 2013, so feel > free to time travel to look at your "best days" and see what the weather > was like. Also, you can move forward in time approximately 4 days. All > of the controls for this site are in the "Earth" button in the bottom left > corner. > > > > Caveat: This website uses computer model data and computer models can be > quite wrong, especially the further forward in time you travel. So take > the forecast maps with a large grain of salt. The maps from the past are > also from this same computer model, so there are still errors, but they are > smaller errors than the forecasts have in them. > > > > Sorry for the delayed response. > > Bryan > > > Bryan Guarente > > Meteorologist/Instructional Designer > > UCAR/The COMET Program > > Boulder, CO > > > > > > On Fri, Sep 18, 2020 at 6:01 AM Lee Simpson <flutteri...@yahoo.com> wrote: > > This is a great map. Is this something we can access? I have looked at the > NOAA aviation wind/streamlines maps but they are nothing like this > > Thanks > > Lee Simpson > > > > On Friday, September 18, 2020, 01:36:07 AM EDT, Bryan Guarente < > bryan.guare...@gmail.com> wrote: > > > > > > Christopher, > > Based on your signature location and the current wind pattern: > > > https://earth.nullschool.net/#2020/09/18/0300Z/wind/isobaric/850hPa/orthographic=-77.30,42.81,960/loc=-76.383,42.485 > > > > You should be seeing this likely through the night with numbers getting > less as the night goes on but plenty of migrants. I have an article coming > out in the Fall North American Birds about why this is the case. > > > > For the short and sweet, looking at the right altitude for migration, the > winds are the right direction for fall migrants into your area, the origin > is quite distant from you, and there is a frontal passage at right this > time getting you some extra convergence of birds in your area. The larger > scale pattern shows that there may be better places than where you are in > terms of large scale convergence, but your pattern is pretty damn good for > migrants. > > > > If you have questions, ask. I am happy to talk more about this. > > > > Bryan Guarente > > Meteorologist/Instructional Designer > > The COMET Program > > Boulder, CO > > > > > > On Thu, Sep 17, 2020 at 11:21 PM Christopher T. Tessaglia-Hymes < > c...@cornell.edu> wrote: > > > > > > > > > > > Posted the following to the NFC Facebook group just now and thought I > would share here: > > > > > > > > > > > I’ve been listening live in Etna, NY tonight since 10:30pm. This has been > an epic migration night here and one of the more constantly vocal in recent > memory. Literally thousands and thousands of calls. Nearly constant calls of > > warblers, thrushes, (and tanagers?), grosbeaks, occasional sparrows, all > stepping upon one another. First regular groups of Gray-cheeked Thrushes > late tonight. One Black-billed Cuckoo. > > Only just now was there a notable gap of some 10-20 seconds without a > call, as a group of coyotes started yipping and whooping. > > > > > > > > > > > > > > Most impressive night to be listening prior to this first calm. It will be > interesting to try to run these data through Vesper (I am recording to file > sequence using Raven Pro; plus recording the full night with my Swift > recorder > > and Flowrabola microphone.) > > > > > > > > > > > > > > Good night-listening! > > > > > > > > Sincerely, > > > > Chris Tessaglia-Hymes > > > > > > > > > Sent from my iPhone > > > > > > > > > > > > > > > > > -- > > > > > *NFC-L List Info:* > > > > > Welcome and Basics > > > > > Rules and Information > > > > > Subscribe, Configuration and Leave > > > > > *Archives:* > > > > > The Mail Archive > > > > > Surfbirds > > > > > Birding.ABA.Org > > > > > *Please submit your observations to eBird!* > > > > > -- > > > > > > > > > -- > > Bryan Guarente > > Meteorologist/Instructional Designer > > UCAR/The COMET Program > > Boulder, CO > > -- > > *NFC-L List Info:* > > Welcome and Basics > > Rules and Information > > Subscribe, Configuration and Leave > > *Archives:* > > The Mail Archive > > Surfbirds > > Birding.ABA.Org > > *Please submit your observations to eBird!* > > -- > > -- > > *NFC-L List Info:* > > Welcome and Basics > > Rules and Information > > Subscribe, Configuration and Leave > > *Archives:* > > The Mail Archive > > Surfbirds > > Birding.ABA.Org > > *Please submit your observations to eBird!* > > -- > > -- > > *NFC-L List Info:* > > Welcome and Basics <http://www.northeastbirding.com/NFC_WELCOME> > > Rules and Information <http://www.northeastbirding.com/NFC_RULES> > > Subscribe, Configuration and Leave > <http://www.northeastbirding.com/NFC-L_SubscribeConfigurationLeave.htm> > > *Archives:* > > The Mail Archive > <http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html> > > Surfbirds <http://www.surfbirds.com/birdingmail/Group/NFC-L> > > Birding.ABA.Org <http://birding.aba.org/maillist/NFC> > > *Please submit your observations to eBird > <http://ebird.org/content/ebird/>!* > > -- > -- > *NFC-L List Info:* > Welcome and Basics <http://www.northeastbirding.com/NFC_WELCOME> > Rules and Information <http://www.northeastbirding.com/NFC_RULES> > Subscribe, Configuration and Leave > <http://www.northeastbirding.com/NFC-L_SubscribeConfigurationLeave.htm> > *Archives:* > The Mail Archive > <http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html> > Surfbirds <http://www.surfbirds.com/birdingmail/Group/NFC-L> > Birding.ABA.Org <http://birding.aba.org/maillist/NFC> > *Please submit your observations to eBird > <http://ebird.org/content/ebird/>!* > -- > -- NFC-L List Info: Welcome and Basics � http://www.northeastbirding.com/NFC_WELCOME Rules and Information � http://www.northeastbirding.com/NFC_RULES Subscribe, Configuration and Leave � http://www.northeastbirding.com/NFC-L_SubscribeConfigurationLeave.htm Archives: The Mail Archive � http://www.mail-archive.com/nfc-l@cornell.edu/maillist.html Surfbirds � http://www.surfbirds.com/birdingmail/Group/NFC-L Birding.ABA.Org � http://birding.aba.org/maillist/NFC Please submit your observations to eBird! ��http://ebird.org/content/ebird/ --
