Making the safe decision (AKA "I hate AIRMET ZULU")

I'm parked at Barnes Muni (BAF) and I want to be home in ROC. But there
is a AIRMET ZULU for ice in the clouds and precipitation above the
freezing level, and there are low clouds layered up to the flight levels,
and the MEA is above the freezing level. So it looks like we're going to
be driving the rental car home, and I'll come back to get the plane in a
couple of days when the weather is clear.

--
Paul Tomblin http://xcski.com/blogs/pt/
"Think?" I asked. "I don't think. I'm a witness. Someone asks me a
question, and I answer it as honestly as I can. How could I be on anyone's
*side*?" -- David P. Murphy, on his participation in a lawsuit

no way to head south ? it's looking a bit clearer down on the CT
coastline, perhaps you can make a great circle out of it and wind up
sneaking back into Rochester from somewhere else.

Sucks to have to drive, but better to be on the ground wishing you were
up there than vice versa.

good luck

Robert

Paul Tomblin wrote:
I'm parked at Barnes Muni (BAF) and I want to be home in ROC. But there
is a AIRMET ZULU for ice in the clouds and precipitation above the
freezing level, and there are low clouds layered up to the flight levels,
and the MEA is above the freezing level. So it looks like we're going to
be driving the rental car home, and I'll come back to get the plane in a
couple of days when the weather is clear.

In a previous article, Robert Chambers said:
no way to head south ? it's looking a bit clearer down on the CT
coastline, perhaps you can make a great circle out of it and wind up
sneaking back into Rochester from somewhere else.

The CIP icing models show some high probability over Rochester itself.
Being downwind of the lake is nothing but heartache in the cold weather.


--
Paul Tomblin http://xcski.com/blogs/pt/
And on the seventh day, He exited from append mode.

Yeah I was thinking if you could get to Utica or somewhere a bit closer
than BAF. The drive would be shorter if you have to leave the plane
there and the drive back to retrieve the bird would be shorter as well.

I've been in icing myself exactly twice and that was 2 times more than I
needed. Each time it happened we got lower altitude and either a 180
out of it or vectors to an airport.

Taking the safest course of action is never a dumb move.

Robert

Paul Tomblin wrote:
In a previous article, Robert Chambers said:

no way to head south ? it's looking a bit clearer down on the CT
coastline, perhaps you can make a great circle out of it and wind up
sneaking back into Rochester from somewhere else.


The CIP icing models show some high probability over Rochester itself.
Being downwind of the lake is nothing but heartache in the cold weather.

In a previous article, Robert Chambers said:
Yeah I was thinking if you could get to Utica or somewhere a bit closer
than BAF. The drive would be shorter if you have to leave the plane
there and the drive back to retrieve the bird would be shorter as well.

As I was driving out of the parking lot at Barnes, there was a fair chunk
of blue sky to the west. I was really tempted to fly west and see how far
I could get VFR with maybe a popup IFR clearance for an approach somewhere
and rent a car there, and that's what I would have done if I were alone.
But my wife doesn't like the uncertainty of not knowing whether we're
going to find a rental car or a motel room.

On the drive home, we drove through some high hills with low clouds down
below the peaks and cold rain, and figured that being in the car was
probably the best decision. I'm just not sure when the conditions are
going to be conducive to bringing the plane home, and the club is NOT
going to be happy about that. I might go down on Wednesday and give it a
try to see how far I get.

--
Paul Tomblin http://xcski.com/blogs/pt/
"Legacy (adj): an uncomplimentary computer-industry epithet that
means 'it works'." -- Anthony DeBoer

On Mon, 24 Oct 2005 01:37:41 +0000 (UTC), (Paul
Tomblin) wrote:

I'm just not sure when the conditions are
going to be conducive to bringing the plane home, and the club is NOT
going to be happy about that.

Yes, they would have been much happier had you become an icing accident.

Seriously, if the club is second guessing your decision, there's something
very wrong with the safety culture there.


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)

In a previous article, Ron Rosenfeld said:
On Mon, 24 Oct 2005 01:37:41 +0000 (UTC), (Paul
Tomblin) wrote:
I'm just not sure when the conditions are
going to be conducive to bringing the plane home, and the club is NOT
going to be happy about that.

Yes, they would have been much happier had you become an icing accident.

Well, the guy who had it booked for Monday and Tuesday wrote to me that
he'd been thinking of cancelling anyway because of the weather, so I feel
better about that.

This morning I look at the airmets, and there are two of them for icing,
with a narrow little corridor between them straight between BAF and ROC.
Not sure if I trust that narrow corridor to stay open, though. How good
are the boundaries of airmets? Are you ever going to encounter the
conditions outside the boundaries, or are they pretty conservative about
them?

--
Paul Tomblin http://xcski.com/blogs/pt/
Programmer (n): One who makes the lies the salesman told come true.

"Paul Tomblin" wrote in message
...
How good
are the boundaries of airmets? Are you ever going to encounter the
conditions outside the boundaries, or are they pretty conservative about
them?

Icing is hardly ever as predictable as we'd like but my personal experience
is that I've found that the boundaries are usually broader than actual icing
conditions, but the accumulation rates can be both more and or less severe
than indicated in the airmet because it is also unpredictable and is highly
dependent on your speed and time spent in the conditions. I also fly around
the great lakes, and downwind from the lake is a great place to find ice
building faster than predicted and faster than you can get out of it.
Usually when the windward side is CAVU, the lake effect layer on the leeward
side isn't very thick, but you sure as hell don't want to be stuck in it
very long. If the windward side is IFR and tops into the teens or higher,
the lake effect moisture is just added to those conditions on the leeward
side, and you've probably lost all your "outs". Stay away... stay far away.

I've found that the ADDS forecast has been pretty accurate. If I can get
above a potential icing layer that isn't too thick, fly towards warmer
conditions and then do a slam dunk down through it into warmer and clear
conditions near my destination, I'll give it some serious consideration. If
I don't have at least 3 "outs", (altitude, distance, improving weather,
higher temps, between layers, ect.) I won't consider it.

This weekend in WI was a perfect case of airmets galore, but good planning
wouldn't have prevented flying due to ice. Overcast at 2700, clear above
3000.(4000 MSL) light to moderate rime ICIP airmet blanketing the entire
state. VFR both south and north of us, surface temps between 40 and 45F.
Freezing level 4000 MSL north sloping to 6000 MSL south. ADDS was
predicting a 80-90% chance of icing at 6000, nothing at 3000, and nothing at
9000. The "go" decision could be made because the clouds at 2700-3000 AGL
were below the freezing level and it was clear above, so the airmet didn't
have any weather that it applied to. Be careful when using ADDS that you
remember ceilings are AGL, icing predictions are MSL. So, we could have
taken off, climbed through the ceiling into clear air.

What if we come upon a layer at 6000 where ADDS said 80-90% chance of ice?

What are our outs?
1) Climb above it, ADDS predicted 0% at 9000, climb is always my first
choice. you can climb before you accumulate ice, you can always go down.

2) descend below it and continue, MEA is 3000 MSL

3) descend through it and land

4) turn around and fly back into clear weather

5) turn 90 degrees to the system and fly around it, this requires knowledge
of the area of coverage and conditions surrounding it, plus additional fuel.

I hate airmet zulu as well, it always throws the unknown at you. All we can
do is explore all our options, set minimal standards, do extra planning, and
be willing to stay on the ground. Fly safe.

Jim

On Mon, 24 Oct 2005 11:28:22 +0000 (UTC), (Paul
Tomblin) wrote:

In a previous article, Ron Rosenfeld said:
On Mon, 24 Oct 2005 01:37:41 +0000 (UTC), (Paul
Tomblin) wrote:
I'm just not sure when the conditions are
going to be conducive to bringing the plane home, and the club is NOT
going to be happy about that.

Yes, they would have been much happier had you become an icing accident.

Well, the guy who had it booked for Monday and Tuesday wrote to me that
he'd been thinking of cancelling anyway because of the weather, so I feel
better about that.

This morning I look at the airmets, and there are two of them for icing,
with a narrow little corridor between them straight between BAF and ROC.
Not sure if I trust that narrow corridor to stay open, though. How good
are the boundaries of airmets? Are you ever going to encounter the
conditions outside the boundaries, or are they pretty conservative about
them?

I have not looked in detail at weather in the NY area today. However,
given the general picture these past few days, I would not fly in a
non-deice'd a/c in the clouds higher than the freezing level. There's a
lot of moisture in these clouds.

An FIP map that I downloaded last night valid at 0900Z showed significant
icing probability along your route at 6,000', although it did look doable
at 3,000'.

I flew today from Eastport to Bangor and back in my non-deiced Mooney. But
I stayed at 3,000' and had no ice -- occasional light rain that sure would
have been ice had I been above the FL (about 4,000'). Here, with little
traffic, there were still scattered reports of icing.

One thing that's real important in flying, is to not weigh factors like "so
and so has the plane booked for whenever so I should try harder to get it
back to home base". That's just another form of "get-home-itis".


Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)

In a previous article, Ron Rosenfeld said:
An FIP map that I downloaded last night valid at 0900Z showed significant
icing probability along your route at 6,000', although it did look doable
at 3,000'.

The MEA between CTR and ALB is 6,000 though. I'm looking at the
possibility of going VFR to the Hudson Valley and then the Mohawk Valley.
But there are still those hills to the south of Rochester.

Thanks for you advice and everybody else's on this thread. I feel like
I've made the right decision, but it's easy to second guess yourself.

--
Paul Tomblin http://xcski.com/blogs/pt/
"Man in the tower, this is the man in the bird, I'm ready to go, so give me
the word." "Man in the bird, this is the man in the tower, you sound funny,
delay's an hour." - Rod Machado