Juneau December 2010

Juneau was notably cold and dry in December 2010. The mean monthly temperature was measured as 22.7°F, a deviation of -6.0°F from the long term mean. The maximum temperature of the month occurred on the 5th with a pleasant 41°F, while the minimum was observed on the 20th with 3°F. Precipitation was light for this location with a monthly sum of 1.90", approximately 1/3 of the normal amount of 5.41" water-equivalent.

Anchorage December 2010

Anchorage experienced in December 2010 below normal temperatures. During the first week and towards the end of the month some days recorded above normal temperatures. Especially remarkable was the last day of the month with a maximum temperature of 38°F, while the minimum was observed on 24 December with -7°F. The monthly mean was calculated to 10.5°F, 7.0&Acirc° below the long term mean. There were 10 days of precipitation of at least 1/100-inch water-equivalent, the monthly sum being 0.87", 0.18" below the long term mean.

Big Delta December 2010

Delta Junction recorded a mean temperature of a cold -14.0°F in December 2010. The coldest day was observed on the 15th with -42°F, while the warmest happened on the 31st with 32°F. The month was on average 14.1°F colder than normal. Precipitation was light with a monthly total of 0.37" water-equivalent, very close to the normal of 0.39".

Fairbanks December 2010

In December 2010, Fairbanks was significantly colder and dryer than expected. The mean monthly temperature was -17.9°F, 12.0°F below the long term mean. This is a very substantial deviation for a monthly mean temperature. The coldest day occurred on the 15th with -41°F, while the last day of the month was the warmest with a maximum of 19°F. Precipitation was 0.23", only 1/3 of the normal of 0.74".

MM5 Contrail Forecasting in Alaska

Fifth-generation mesoscale model (MM5) is being used for forecasting the atmospheric layers of aircraft condensation trail (contrail) formation. Contrail forecasts are based on a conventional algorithm describing the adiabatic mixing of aircraft exhaust with environmental air.

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