★Predicting blooming dates Wendy is interested in Cherry forecast map of Japan very much. So I wrote there were two very easy ways to know blooming time of Somei-yoshinos in short time. She wanted me to write here to start discussion. In Japan many weather companies make Cherry Forecasts using formulas with past weather data, weight of buds and weather forecast of long and short time. But there are two ways of easy short time forecasts in Tokyo and south. 1. Somei-yoshinos start blooming when the sum total of the highest temperature of the days from February 1st exceed 600 degrees. 2. Somei-yoshinos start blooming when the sum total of the average temperature of the days from February 1st exceed 400 degrees. * The temperature of the blooming day must exceed 12 degrees in Tokyo and 10 degrees in north. *There must be some rains before blooming. (In Tokyo winter is very dry. We had only a few rainy days inTokyo this year.) *The blooming date in Tokyo means the day when the sample tree has 5 flowers open. I had heard those rules but I hadn"t tried them myself. So before I wrote here I checked they worked or not. I checked blooming dates and copy-and-pasted resent weather data from Meteorological Agency to excel sheet and calculated. I made a sheet of excel to show the result but I couldn't past here. Anyway, the theory of 600 degrees of highest temperature works very well for Somei-yoshinos in Tokyo. The theory of 400 degrees of average temperature works for most of times but sometimes doesn’t work at all. But when I check Sapporo in Hokkaido, the north island, both theories didn’t work. The weather of Sapporo more similar to the one in Vancouver. I think there are some days the highest temperature are minus. The warm temperatures helped the buds growing but when the coldness came, I don’t think they go back to winter condition again. I think they are rather taking a rest for growing. So I omitted the highest temperature below 0, the theory works a little better. (I didn’t calculate sum of average temperature because it looked not working.) If I make the sum total to 550 degrees, it really looks good. I checked 6 years result but they stayed ±2 days. When I think about predicting blooming date in Vancouver, I think cherries in Vancouver must have some rules about temperatures. Akebono is a little different from Somei-yoshino, but it must have its own rule. Now you have blooming data of past 13 years and I think you can get the detail data of past daily temperature. Then you might be able to find the rule of blooming date.