Thanks, Ted.
Centennial (Orchard and Colorado Blvd):
Really damp out,,,East Coast bone chilling high humidity. Mild NE breeze,
under 3 mph, or stillness. One seep in 5 minutes...Around midnight I heard
about one bird every 2 min. Back to bed, see what's around in a couple of
hours.
Karl Stecher
Centennial
Ted Floyd writes:
Hello, Birders.
Here's a real-time report from Lafayette, eastern Boulder County, ca. 4:20
a.m., Thurs. morning, Sept. 11. Low cloud ceiling, 51 degrees Fahrenheit,
winds out of the north. We're not quite yet down to the dew point, but with
all the humidity, it should be a mess if the temp drops another degree or
two.
Haven't heard a peep--I mean a tsweep--in the 20 minutes I've been out here.
Regarding upsweeping tsweeps, I agree that they can be Spizella sparrows.
Also Vesper Sparrows, White-crowned Sparrows, and Orange-crowned Warblers.
All the Spizellas (well, n=2) on a quick check yesterday afternoon
(Wednesday, Sept. 10) of Greenlee Preserve, Boulder County, were
Clay-colors, for what it's worth. And a decent pulse of Orange-crowned
Warblers (but Wilson's still dominating). A Gray Flycatcher was a nice
empid (Dusky seen and heard, too).
Ted Floyd
Lafayette, Boulder County, Colorado
On Thursday, September 11, 2014 12:22:31 AM UTC-6, Bryan Guarente wrote:
Another run at Night Flight Calls and I produced 19 calls in two minutes
(all spizella type calls - upsweeping "tseeps"). And the clouds haven't
even started to cover up the skies.
Bryan
Bryan Guarente
Instructional Designer/Meteorologist
UCAR/The COMET Program
Boulder, CO
On Wed, Sep 10, 2014 at 11:18 PM, Bryan Guarente <bryan.g...@gmail.com
<javascript:>> wrote:
Just got back in (11:15) from an early night flight listening. Had 53
night flight calls in 38 minutes. That is WAY up from the normal,
especially for a clear night (so far). One data point for the data set.
Radar is lighting up a little as well if you want to use that. Had 5
species (guesstimate) including Chipping Sparrow and Wilson's Warbler.
Good luck out there.
Bryan
Bryan Guarente
Instructional Designer/Meteorologist
UCAR/The COMET Program
Boulder, CO
On Wed, Sep 10, 2014 at 9:09 PM, Bryan Guarente <bryan.g...@gmail.com
<javascript:>> wrote:
Great question! So the first question to answer is, does it matter if
it is raining or not? If you are Ted Floyd out there in the middle of the
night listening, maybe (it makes it harder to hear if it is raining). But
overall, I believe that it doesn't matter whether it is raining or not.
The winds are what matters and the clouds play an integral part in the
night flight equation. Now, as for the migration pattern, it still remains
nearly the same with a minor deceleration of the entire system (depending
on which computer model you believe). This redistributes some of the bird
movement, but not too much. Here is the 6am Thursday map:
[image: Inline image 1]
Clouds should increase throughout the night, and we still might see
drizzle or rain in the morning, but it is less likely now. The winds are
making nice patterns now for more specific migration locations in the
morning. The two red arrows are giving us a clue to where the migration
should be maximized. The northern arrow is pointing to a corridor from
Brighton through Fort Collins. The southern arrow is pointing toward a
corridor from Pueblo to La Junta. Both of these are approximate. I would
say the more likely one to have more birds is the northern circulation
because there is less need for the birds to turn toward the mountains and
go back to the north. However, one could still see birds locally converge
on these spots, so it could still mean increased bird activity in those
general areas. There is also a convergence zone connecting the two
circulations that will also play nicely for birds. Here is a zoomed in map:
[image: Inline image 2]
You can already see reflections of these circulations in the current
surface observations:
http://weather.rap.ucar.edu/surface/displaySfc.php?region=den&endDate=20140911&endTime=-1&duration=0
That is an auto-updating map that should take you to the "current"
observations. At the time of me writing this, there are circulations
forming around Longmont/Loveland and Pueblo. I would personally pinpoint
the areas where these circulations are in the morning. Keep your eyes on
the surface observations (specifically the winds) and try to figure out
where they are pointing, and that is where you should point as well. "Put
the wind at your back and start walking." or "Go where the winds take you."
Let the list know how your ventures go tomorrow and how that relates to
today or yesterday.
Let me know if there are any questions and thank you to those of you who
have back-channel thanked me. I appreciate the kudos and also like doing
this for the community to see how it plays out. We are all learning more
about the interconnections.
Good luck.
Bryan Guarente
Instructional Designer/Meteorologist
UCAR/The COMET Program
Boulder, CO
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