Thursday, March 8, 2012

Blog Post 1



Eugene, OR
Eugene sits approximately 60 miles west of the central Oregon coast. Eugene probably has a low (maritime) bowen ratio, with a rough guess of around 0.25. Eugene offers a temperate climate with winter temperatures averaging in the 40's and summer temperatures averaging in the upper 70's and lower 80's. Eugene is nestled in the Wilamette Valley, at the convergence of two rivers. The weather station chosen is KEUG, located at the Eugene airport (44.1˚N 123.2˚W) which is just north of downtown. The station history goes back to 1939. According to the National Climatic Data Center, the Eugene Area (Lane County) has experienced periods of heavy snow and blizzards, very strong thunderstorms, tornadoes (the last one in 1999 F0), funnel clouds, flooding, and hail. 

Image: USGS, 2011
This topographic map shows the drastic elevation changes that take place in the Eugene Area. Eugene has an elevation of approximately 500 feet, sitting at the base of a valley.
 
Image Source: http://www.world-climates.com/city-climate-eugene-oregon-usa-north-america/
It is evident through this chart that Eugene is warmest in July-August, which is also when it gets the least amount of precipitation. The coldest months are December-January, which is also the peak of the moist season. This year has been a La Nina year, which would suggest that Eugene has received higher than normal precipitation. 

This graph shows the average high temperatures and low temperatures for Eugene in each given month.
Source: 
http://www.weather.com/weather/wxclimatology/monthly/graph/USOR0118

Image Source:  http://graphical.weather.gov/sectors/pacnorthwestWeek.php#tabs
This visual forecast from the National Weather Service indicates a much needed break in precipitation for the Eugene area. This coincides with a news story in The Oregonian stating Portland will be reaching 60 for the first time in 2012 tomorrow. This may support hypothesis La Nina is weakening.  
Image Source: NOAA
The East-West weather patterns, combined with different pressure gradients allow much of the weather that comes to Colorado to enter land through the Pacific Northwest, including Eugene, contributing largely to Eugene's very wet climate. 

GEEBIT
Using GEEBIT B3 to play with Earth's albedo revealed increasing the albedo by just 0.1, cooled earths temperature by 9.7˚C (from -18.8˚C to -28.5˚C). Decreasing the albedo by 0.1, warmed earths temperature by 8.7˚C (to -10.1˚C). Changing Earth's Greenhouse gasses by 0.1 changed earth's temperature less drastically, on average by 2.8˚C. With normal albedo and greenhouse factor, earth averaged about 15˚C. Changing either in either direction could be detrimental to Eugene. A warmer atmosphere could cause more severe weather, or even encroaching oceans. Warmer Pacific Ocean temperatures could bring tropical storms or hurricanes to Eugene. Cooler weather would certainly cause more ice storms. The latent heat flux between the ocean and land may become more dramatic in either circumstance. 

Total Words Excluding Captions: 242



1 comment:

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