I realize it is not great to confess weakness, but I suck at weather. I just don't really pay that much attention to it (desk job) and up until now I have cancelled a lot of personal VFR flights because I like to fly on extra nice days. In addition, I stay within 1 hour or less of my home airport, where I can fly pretty darned low if I have to and avoid the mountains, and often I don't land anywhere else. The two times I have (coastal destinations) the clouds have snuck up on me and I've had to hurrry home. Lessons learned. I do not know the patterns of the wind, or clouds, or storms, or how to read a chart (bad I know). These things were never covered by my CFI (not much) and were a "memory" item quickly lost after my written exam - last May. I need to make a go vs no-go decision about a 400nm XC this week (200nm each way). The problem is I'm leaving on Friday and (ideally) coming back on Monday - so the weather can obviously change a lot during that time. What you should know is that I have a passenger, and we have decided to drive OR fly ON FRIDAY ONLY so that we don't miss too many of the activities (about 20 people are going on this vacation / family reunion from his family). In other words, if Friday is a "no go" for flying down there, we will just hop in the car. We will probably need to decide by noon. I have choices regarding my route, but since we barely got 70kts ground speed last time in the 150, I probably don't want to fly the coast due to the restrictions (at one point I need to be below 1500 feet over the ocean to avoid the Bravo if they don't clear me through it). Information: Departing O69 (Petaluma), Friday, anytime after 9:00am (school opens at 8:30am) Full fuel (don't have the POH with me but I bought a copy). It is a 1975 Cessna 150 with - I think - only 22 gallons useable. Destination: San Luis Obispo KSBP (parking for free for 4 days at the Jet Center in exchange for buying 10 gallons of their fuel) Goal: non-stop, but can stop if flight takes longer than 3 hours (fuel = time). Distance (straight line): 200nm - but I need to get out my plotter to measure exact distance or use Foreflight if I can learn way points. There are MOA / RESTRICTED AREAS very close to my destination that need to be avoided, and looking in the general area, using "minimum safe altitudes" from the squares on the sectional, there are some that are as high as 6200 feet. It is south, so that means 5,500 or 7,500 (I still need to look at airspace too).