Hi,

following this thread from page 1, I found no useful weather informations for the day Mr Boychuck went missing. So I searched myself.
Here are the weather observations from Vancouver CYVR, October 23, hourly from 5 to 11 UTC (12 to 18 PDT).

CYVR 230500Z 08008KT 12SM OVC026 13/10 A3037 RMK SC8 SLP285

CYVR 230600Z 06009KT 12SM OVC027 13/10 A3038 RMK SC8 SLP288

CYVR 230700Z 06010KT 10SM OVC027 13/10 A3038 RMK SC8 SLP288

CYVR 230800Z 07006KT 10SM FEW018 BKN026 OVC046 13/11 A3037 RMK SF2SC5SC2 SLP286

CYVR 230900Z 06007KT 10SM BKN029 BKN034 OVC046 13/11 A3037 RMK SC5SC2SC2 SLP283

CYVR 231028Z 07008KT 10SM -SHRA BKN032 OVC049 13/ RMK SC5SC3

CYVR 231100Z 06005KT 10SM SCT032 OVC056 13/10 A3033 RMK SC4SC4 SLP272

For the non-pilots.
Generaly low winds 5 to 10Kts from 060 to 080 and a low ceiling.
From 12 to 14 PDT overast cloud layer at 2600 to 2700 ft over CYVR (nearly sealevel). In the late afternoon lifting up to 5000+ft (read: getting better).

Note: These are the observations from Vancouver. They are not representative for the whole route Mr Boychuck flew.
They are for information only.

No good weather for a mountain trip.
It is possible that around noon, most ridges were in clouds.
The tendency to become better in the late afternoon could be
the reason for the late departure of Mr Boychuck.

If it helps, I can try to get some aviation weather information from other locations enroute.

Joe