Over the past few days, several weather records have been broken in Arizona. Unfortunately for us, all of them are in the wrong direction for generating convection.
With no moisture in the air to prevent heat loss, Flagstaff's overnight lows on Friday and Saturday night broke records. Saturday night's low (on Sunday morning) was 35o, breaking (shattering!) the old record (set in 1999) of 44o. In fact, as we gathered at 5am to do our sunrise balloon launch, my iPhone mentioned that it was 37o in Flagstaff AND in Barrow, Alaska. Brrr. Of course, nobody brought winter wear, so it was multiple tee shirt layers!
The previous night's low was also 35o, breaking the old record (1950) of 39o. Meanwhile down south, the Phoenix TV stations are reporting record-breaking low dew point temperatures. Unfortunately these are not archived by the NWS, but the numbers we're been seeing both in Flagstaff and in Phoenix are really low. Normally they would be in the 50's or better in the monsoon season. In fact, the record high dew point temperature for today (8/10/09) in Phoenix is reported as 73.9o. As I write this, Td in FLG is 23o. Rats!
Precipitation forecasting is pretty accurate in these conditions. Even I can do it! Forecast: zero.
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