Some weather anomalies

I got alarmed a number of days ago when I looked at the Global Forecasting System (GFS) model runs. This weather prediction run goes the farthest of any of them, 16 days, but is not notoriously accurate past about day 7. I was surprised by what I saw. It clearly showed a storm now over Sierra Leone, Africa, moving off the African coast, moving and strengthening across the Atlantic ocean, riding up Puerto Rico to the Bahamas, then crashing into Myrtle Beach, heading to Charlotte, then hooking to the right towards Richmond, on 2004 July 21, Wednesday evening. It then hooks back to the left and hits Washington, DC. In other words, it calls for a hurricane to strike the US East Coast two weeks from now, and I figured it would be called Alex.

I thought, maybe this was a fluke of this run of the GFS. After all, this is two weeks away, and the next run of the model may show something different. So I looked at the 12Z run, one run before this one. That one shows Alex heading straight up the peninsula of Florida, then whipping around to hit Charlotte, finally exiting to sea somewhere near the Outer Banks. So there may be some reality to this one. I looked back one more, and there it nicked the Florida keys and hit Louisiana. The one before that had it turning north out to sea long before it approaches the mainland. Each run seems to get worse as far as the East Coast was concerned.

I am going to SUUSI that week, and so I got concerned that Alex (or Bonnie; a storm is developing southeast of Bermuda) would either strike SUUSI or strike my home.So I looked at subsequent runs. One of these showed it missing the coast and going out to sea, but the last two runs don't show any hurricane much at all; what there is peters out over the open waters of the Atlantic and don't show much motion at all. So much for this storm.

In fact, the weather is going to be great the next few days in central Virginia. Here a local TV station, WWBT-TV, Channel 12, predicts that there will be a chance of storms each day, and showed a 7-day pictorial forecast with a rain symbol on each day of the week. However, the official NOAA forecast, as seen for example on Weather Underground, does not show any rain at all. In fact, after two days, it gets monotonous in predicting partly cloudy with high of 90 and low of 70 each day. One or the other of these two contradictory forecasts is right and one is wrong. We will see the next few days which it is.

Goes to show that weather sometimes plays a fickle tune.

Saturn and Titan

1991 was the year for eclipses. 2001 was Meteor Shower Year. 2003 was the Year of Mars, with its close approach and the two Rovers. It looks like now that 2004 will be the Year of Saturn, for the Cassini spacecraft has just arrived.

As usual, it gives its host of interesting images. The rings show up as a set of parallel lines etched in space, closer than we have ever seen them. The biggest interest point for me now is Titan. The probe is not supposed to eject a probe onto the Titanian surface until this (Northern) winter, but already Titan has given us some interesting images. Finally the surface of Titan has been seen! I remember long ago, in 1981 or something, when Pioneer 11 approached Saturn. It was to take a temperature of the cloud tops of Titan, but a Soviet satellite interfered. I immediately printed out a headline: "The Temperature of Titan is Sputnik." Since then astronomers have been wondering about the surface of Titan. It gives a solid orange to optical telescopes. But with an infrared and other cameras and some photo work, pictures showing the features of Titan have just come out; check out the NASA web site, which, by the way, frequently throws 404s in your face. But once in a while you get the site and you can check out the Titan photos.

The surface, like anything else, is raising more questions than answering them. The features look like Mars' canyons, but what kind of oceans could produce these? Water? Too cold. How about carbon dioxide or nitrogen? But it has a nitrogen atmosphere. So we await the answers and look with awe at Saturn's image in a telescope.

Fireworks 2004

Yesterday I went out to see the fireworks, and saw one of the best fireworks displays of my life. Usually I go out running on July 4, running to all the fireworks displays that I can find. Last year I did not see much in my neighborhood. But yesterday, I saw three good displays, including one that would have rivaled the local community's official display, and further, the displays were enhanced by lightning flashing in the distance.

I walked this year rather than ran, because Anne was with me. We went down one street to a dead end bulb, and saw some sparklers and some shooting fireworks, which fizzled when they exploded. But then we went to another display that shot sets of fireworks three or four times. These fireworks produced colorful and bright bursts in the sky, causing the ground to seem like it was lit by a strobe light. This effect was enhanced from lightning strobing up the sky from about 30-40 miles away. The combination of flashing and bright colored lights was one of the most impressive I have seen, and it beats battling huge traffic jams to go to a public display. There were even a few fireflies around. We also went to a third display, which featured two fireworks trees and several high-flying fireworks with bursts.

Later on that evening, the storm producing the lightning struck and gave us some rain and thunder. It was fortunate that the clouds and rain cleared enough for all the fireworks displays to go on OK. An excellent display, which will be tough for 2005 to beat.