Category Archives: Weather & Sky

Cold Sun

Outside my window (photo by Kate St. John)It’s one of those days when it looks nicer outside than it really is.   The wind is blowing hard from the north but the sun is out so the birds and squirrels are at my feeders. 

It’s a good day for staying indoors with a cup of hot chocolate.  I know this because I took a walk at Duck Hollow this morning.  It’s sheltered from the north so after seeing hundreds of gulls, some hooded mergansers and a lesser scaup I walked along the river trail. 

There I found a flock of cardinals, carolina chickadees and white-throated sparrows eating Oriental bittersweet berries.  This invasive plant seemed to be the only abundant bird food along the trail – except for the birds themselves.  A red-tailed hawk eventually caught one of them. 

I rounded the bend in the river.  Now the wind was in my face but there was a surprise overhead.  Two flocks of tundra swans flew over.  Woo hoo!

By then I was thoroughly cold so I hurried home for lunch and the comforts of home – and to look outside my window.

(photo by Kate St. John, taken from my back window)

So blue!

Absolutely blue skyI couldn’t let this day pass without commenting that we have yet another day of absolutely blue sky in Pittsburgh.  It looks just like that blue square at left (which is actually a picture of the sky).

Without a single cloud, it’s pretty hard to see migrating hawks.  I’m sure they’re up there but there’s no way to see them in a sky this blue.

OK, so I’m asking for clouds.

I’ll live to regret this request next month in gray November.

Not Long Now…

Red Sassafras leaves (photo by Kate St. John)Compared to the Great Plains and the coasts, Pittsburgh is not a windy place.  Our typical wind speed is 5-10 miles per hour and some days there’s no wind at all.

Gentle breezes are the norm, so you’ll understand why one of my favorite sounds is the swish of wind in the leaves.  Their rustling is so soothing that it actually improves my day to hear it.

Because I love this sound, I began to care whether the leaves were on or off the trees.  About ten years ago I started to keep track.

First I developed a rough standard for measuring “on” and “off.”  Then, using my neighborhood and Schenley Park as yardsticks, I watched the seasons change and tried to pick the date when most of the trees were bare.  Over the years that date has been around November 11th.

Of course the date is very weather dependent.  If a strong cold front comes through early, the wind and rain strip the trees.  If the weather’s mild and our first hard frost is late, the leaves hang on longer.  I’ve seen the date move later in recent years.

In any case, the days of leaves are numbered now.  It won’t be long before the trees are bare.  Then silence, except for the clacking of bare branches during winter storms.

(photo from my cell phone)

November 9, 2008:  Today is the first day this fall that most of the trees are bare.

Color & migration at Schenley Park

Ash tree at Schenley Park, Oct 11, 2008 (photo by Kate St.John)Not much to report – but it was a sunny day in Pittsburgh so I ignored my Saturday chores and took a walk in Schenley Park.

The fall colors are beautiful, as you can see by my photo.

I had my binoculars with me (always!) and searched the Cathedral of Learning for the peregrines when I got within view.  It didn’t take long to find them.

A light southeast wind was carrying migrating red-tailed hawks over Oakland.  The migrants didn’t know there are peregrines at Pitt and inevitably tried to catch an updraft at the Cathedral of Learning.  When they did, one of the peregrines would pop off the building and attack them.  This was bewildering for the hawks but I must admit I enjoyed watching the action after so many boring months of peregrine inactivity.

Between mock attacks, Dorothy and E2 perched up high to wait for the next red-tail.  It was a perfect day for hawk watching.

If a tree falls in the forest…

Fallen tree (photo by Kate St. John)…does it make a sound?

You bet it does!

On Sunday night, as the remnants of Hurricane Ike passed through western Pennsylvania, too many of us heard the noise of falling trees.  No rain fell but the wind gusted from 65 to 79 miles per hour.

Just that afternoon I had hiked the Glacier Ridge Trail at Moraine State Park.  At that point the weather was already unpleasant – 86 degrees and humid with winds over 30mph.

In the distance I heard the crack of a rifle shot, then several rapid shots followed by the sound of cannon.  It wasn’t gunfire.  Somewhere out of sight, a tree fell in the forest.

I was lucky I wasn’t close enough to see that tree fall.  When we were in Maine I learned about widow makers from my cousin John.  They’re dead limbs that are about to fall or have fallen partway and are hanging overhead.  Just a touch of wind is enough to send them hurtling to the ground.

Now that I knew what I was looking at, these trees over the trail made me nervous.  (I took their picture anyway).  The stronger the wind got, the sooner I wanted to be out of the woods so I picked up my pace.

Later that night when the wind howled against our house I wondered about the flock of wood thrushes I’d found in a thicket near these broken trees.   I hope they made it through the storm.

Drought

After a long, long spate of beautiful weather we now have a drought.  The sunny days and clear cool nights I find so appealing have not produced any rain.  It’s another case of too much of a good thing.

Pittsburgh’s precipitation is 0.22″ below normal for August, but 1.62″ above normal for the calendar year.  

The statistics are deceiving.  The rain we’ve had has not fallen gently over the course of several hours.  Instead it arrives in huge, brief, torrential downpours that run off rapidly without soaking into the soil.

Of course this is hard on the crops, but I feel bad for the forest too.  Some of the trees have started to turn yellow already – notably the ash trees.  Others are dying, especially elms that are already under the stress of Dutch elm disease. 

Unlike ourselves, everything outdoors is completely at the mercy of the weather – even beautiful weather.

I hope it rains soon!

Citizen science reveals…

The second Pennsylvania Breeding Bird Atlas is drawing to a close and the final data analysis is about to begin.  I think we’ll learn a lot from the results if New York’s Breeding Bird Atlas is any guide.

From 2004 through 2008 Pennsylvania birders roamed the state looking for birds who were claiming territory, building nests, incubating eggs or feeding young.  We did our best to cover every nook and cranny, recording the breeding evidence of species we found in each 9-square-mile block.   With over 4,900 blocks in the state, it was a big job.

The first Pennsylvania BBA was conducted from 1984 through 1988 so one outcome of the second atlas project will be a comparison of breeding ranges and species over the past twenty years.  If we want a hint at the results we can look to New York whose breeding bird atlas was completed three years ahead of ours.

Like Pennsylvania, New York conducted two atlas surveys twenty years apart.  When SUNY College of Environmental Science and Forestry (ESF) compared the two data sets they discovered that the ranges of many species have changed significantly in only two decades.  The birds have moved northward.

Southern birds, like the red-bellied woodpecker pictured here, have moved further into New York while northern birds, like the pine siskin, no longer breed in parts of New York because their southern range boundary has shifted into Canada.

Interestingly, the northern birds are receding faster into Canada than the southern ones are proceeding into New York.  This pattern, added to earlier spring migration arrival, points to climate change as a possible cause.

Will we notice this in Pennsylvania too?  Stay tuned.

(photo by Chuck Tague)

 

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2781852/

Cloud Gazing


One of the benefits of watching birds is that I’ve gained an appreciation for clouds.  The beautiful ones are almost as ephemeral as birds, forming and dissipating in a matter of minutes.  I noticed this principle on Sunday at Lake Arthur.

It was a warm sunny day as I walked the trails along the lake shore.  Eventually the sound of the water and wind lulled me into sleepiness.  Hammock time!  But I didn’t have a hammock so I sat down on the grass.  Pretty soon I lay down and looked straight up.

A few birds caught my attention but the big attraction was the cloud layer that looked like a honeycomb, as shown here.

Cirrocumulus are the highest clouds.  Formed of ice crystals above 16,500 feet, they often have an iridescence that I can see with my polarized sunglasses.   Below them were a few altocumulus, mid-level clouds at 6,500 to 16,500 feet and one beautiful lenticular cloud, a lozenge in the sky.

If the altocumulus clouds had been thicker, they might have meant a weather system was approaching.  Instead, they broke up and floated away leaving a clear sky Sunday night with a bright, full moon.

Summer clouds make me happy.  I will try to remember this in November when Pittsburgh’s clouds blanket the sky.

(stock photo from Shutterstock)

One very wet peregrine

Peregrine falcon from Gulf Tower nest, June 2008 (photo by Terri Watson)Who’s this birdie at the window?  He’s one of the young peregrines who fledged from the Gulf Tower, photographed by Terri Watson at K&L Gates

This isn’t the first time a peregrine perched outside K&L Gates’ windows but it’s the first time they’ve seen such a wet one.  Our weather has been punctuated by downpours lately and this little guy certainly got caught in one.

He’s probably just waiting to dry out and decided the activity indoors was pretty interesting.

Thanks to Jan Christensen for sending this along.

(photo by Terri Watson)

Weather mortality

Rain clouds over Greenfield, Pittsburgh, PA

Tornadoes and cyclones kill people, but did you know that merely lousy weather kills birds?

The past few weeks have been miserable here in Pittsburgh.  My cellphone picture from last Sunday tells it all.  It has rained nearly every day, sometimes it’s windy, always it’s cold.  It’s been bad for farmers and gardeners and anything that lives outdoors.

The birds who eat insects, such as chimney swifts and swallows, have taken it on the chin.  Insects hide from the cold so there’s less to eat, but that’s precisely when the birds need more food to maintain their body temperature.

I haven’t seen as many chimney swifts and swallows as I’d expect at this time of year.  The ones who haven’t arrived yet from the south are probably lucky.  It’s been so miserable that a flock of chimney swifts gave up for the day at 3:00pm last Wednesday.  I saw them spiral around a chimney and drop in to roost where they clung to the inside to wait out the cold.  I hope the chimney was not fed by a furnace.  We all had our furnaces on.

Bluebirds have suffered too.  They lay their first eggs in April and fledge their first brood in May, feeding them insects from the fields around their nests.  Len Hess reported on PABIRDS that 23 of out of 28 baby bluebirds died in the nest boxes he monitors in Westmoreland County.  The young birds were healthy and doing fine the previous week but the cold and rain spelled disaster.  The same was true for Fred Zahradnik’s bluebirds in the eastern part of the state where they experienced a nor’easter.

This morning there’s a break in the clouds.  Tomorrow the weather is supposed to change, bringing sun and temperatures in the 60s and 70s for the weekend.

Thank goodness for all our sakes!