
Forecasting the weather in Seattle can be a tough job. The National Weather Service (used by King5, Weather.com, and other local weather experts) only had a 75% accuracy rating last year, whereas Forecast Watch (which tracks statistical accuracy of weather forecasts all over the country) has an 80% accuracy rate, still not completely reliable when you consider that 1 out of every 5 forecasts is inaccurate.

Weather Prediction Accuracy
Most of the time, that inaccuracy doesn’t affect the general population much. Forecasters might say it will rain when it doesn’t, or predict warmer temperatures but instead we find cooler temperatures. Occasionally though, a weather situation will be predicted and the more unusual the prediction is, the higher we tend to set our expectations, and the more disappointed we will be when those initial predictions do not become reality.
Yesterday in the blogsophere, I saw post after post from people who were disappointed and in some cases, angry. “The Weather People Need to be Punched in the Neck“, “F**k you, Seattle & KCM“, “Seattle weather forecasters…. YOU’RE FIRED!!!“, and “Seattle schools can suck it!”. The last post was one man’s rant about the Seattle School District’s decision to close school for the day. The decision to close public schools based on weather predictions is one choice I am glad I do not have to make.
School officials’ caution dates back to a 1990 snowstorm that dumped several inches of unexpected snow, paralyzing the city and forcing 1,200 children to spend the night in their classrooms. Since then, the state’s largest school district and its suburban neighbors close as a precaution when snow threatens. (source)
Last winter, BCC received negative feedback after deciding to keep campus open despite predictions for an icy morning. I made the choice to stay home that day because it was not safe for me to walk to my bus stop, and many others made the same choice. BCC responded with a letter detailing the way the decision is made to close campus and what stuck in my mind after all this time was the note that officials have to make a choice between 2am and 5am whether to close schools based on current weather conditions and predictions. As cited above, weather prediction is only about 80% accurate at best. When weather forecasters predict the same scenario for days preceding a big storm that may cripple the region, combined with past experiences of not taking action in time, I can’t blame school district officials for declaring school closures before the storm actually strikes. If the school district had made the opposite decision and the storm did hit the greater Seattle area as predicted, many more people would have been upset that the schools hadn’t been closed as a precaution. Officials just can’t win in this situation.

The main reason that the snow did not come yesterday as expected was the so-called Olympic Rain Shadow. The mountains are similar to a boulder in a stream, splitting the flow of water and creating a calm spot just behind the boulder. Bad analogy, I know, but with Seattle’s geographical features, it’s one reason why the storm split, dumping snow on the greater Puget Sound region and not the main Seattle area. This is explained in a new book from UW professor of atmospheric sciences Cliff Mass regarding Pacific Northwest weather:
It explains how, perhaps 25 times a year, an air mass is split by the Olympic Mountains, then reconnects over Puget Sound somewhere between north Seattle and Everett in what is called the Puget Sound convergence zone, an area that can then be rainy even though the sun shines brightly just 15 miles to the south. It tells how the coastal mountains in Washington and Oregon create a “rain shadow,” wringing a great deal of moisture from Pacific storm systems on the west side of the mountains so substantially less moisture is left for areas east of the mountains. And it dispels the myth that the Seattle area is one of the rainiest places in the country, comparing Seattle’s annual rainfall of 37 inches with the averages of 47 inches in New York City and 56 inches in Miami. (source)
The Seattle region is not equipped to handle harsh winter conditions. We have less than 30 snowplows, many of which cannot access neighborhood streets due to street parking or abandoned vehicles. Metro does have chains for it’s fleet, but some of the hills in Seattle are just too steep or narrow to navigate during times of snow or ice. You can read more at this SDOT website, which includes detailed numbers of equipment, employees, and snowplow/deicing routes. We could spend more taxpayer dollars on building a better infrastructure that can handle this adverse weather, but honestly we only use it a few days a year, so it would be a waste of funds in my opinion. People here are not used to handling such conditions, so the snark from East Coast transplants who have cities used to dealing with these conditions is not appreciated either. Yes, Minnesota can handle 2 feet of snow without closing public schools, but Seattle cannot, for the very reasons I just listed above.

All in all, getting angry because the weather forecasters were wrong is honestly a waste of energy. Getting angry at the school district for not closing campuses is also unfair. We get what we get, we have no control over the weather, and we can only plan ahead for what may happen. Personally, I was glad that we did not have snow and ice yesterday, as it allowed me the chance to travel to my doctor for a post-surgery visit. With the snow today, all I can do is look at it through my window and wish I had chosen to have surgery another time. Traveling through the snow in crutches is definitely against the wishes of my doctor.