Previously, the forecast looked like it would be good for build-up of birds all along the Colorado Rockies. Today's model runs look different though, and you may have noticed a change in your weather app's forecast as well because of it. Here is what it looks like now for tonight at midnight:
https://earth.nullschool.net/#2020/04/16/0600Z/wind/isobaric/850hPa/orthographic=-105.0,40.0,2421/loc=-105.000,40.000 The front came through earlier than expected, and has cut-off the possibility of good overnight migration further north in CO along the Front Range and has now limited down the good migration area to further south (along the Arkansas River). The best bet for overnight migration is along a line from La Junta to Holly, CO (and into KS). The flow looks more convergent over La Junta than over Holly, so the further west on that line you can go the better. With the frontal passage happening earlier than expected, the entire possibility of good migration into CO has changed with more northerly winds throughout (until the Arkansas River). This has also driven the possibility of good migration farther south and east on this side of the system, but driven the eastern portions of the good migration flyway farther north and east into IA/IL at daybreak tomorrow. Here is daybreak tomorrow (with Boulder highlighted as the Green Circle): https://earth.nullschool.net/#2020/04/16/1200Z/wind/isobaric/850hPa/orthographic=-105.0,40.0,2421/loc=-105,40 So major differences in CO migration compared to what we saw yesterday as a good possibility of migration throughout the region overnight. Sorry to those of you in the now-not-so-good areas (CO Front Range north of Pueblo) and bonus to those of you in SE CO who could expect some intrigue out of this system. Best of luck out there. Bryan Bryan Guarente Meteorologist/Instructional Designer UCAR/The COMET Program Boulder, CO -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/CAENnWHs16mwWGDD02Vw2_CBY6c3ZJosoUd-UPjTrpecy4Hzv_w%40mail.gmail.com.
