Tag Archives: NWS

NOAA shows that wind farms affect weather radar, and that affects their primary mission of forecasting and safety

“Chaotic wind velocities associated with the rotating turbine blades triggers the doppler radar mesocyclone detection algorithm” Note: this essay was written by the National Weather Service Forecast Office is Burlington, Vermont and tipped to me by a reader. Vermont’s wind … Continue reading

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Posted in Technology, thunderstorms, tornadoes, Weather, wind power | Tagged , , , , | 59 Comments

Oklahoma tornado officially an EF5 – wind speeds still less than 1999 Moore tornado

The map below shows ‘Tornado Tracks Streak Across Oklahoma’ as measured by doppler radar. The rotation of tornadoes creates a distinctive signature in radar data, and can be used to estimate the track that the system takes over land. This … Continue reading

Posted in tornadoes, Weather | Tagged , , , , , , , | 31 Comments

2011 US Tornado Year Analyzed – no trend indication, still below 1974 for strong to violent tornadoes

Guest Post by Paul Homewood NOAA have just about finalised their numbers for the 2011 tornado season, although December figures still await confirmation. It usually takes about three months to confirm the provisional reports as each tornado report has to … Continue reading

Posted in tornadoes, Weather | Tagged , , , , , , , | 29 Comments

Extremely Dangerous Storm Slicing Towards Alaska

From Live Science An extremely dangerous storm is slicing toward northwestern Alaska and is expected to bring blizzard conditions and hurricane-strength winds to the state’s west coast. The storm, which formed from a mix of air masses over an area … Continue reading

Posted in Weather | Tagged , , , , , , , | 98 Comments

NOAA: leaving bad data stand in Laredo

From Dr. Roger Pielke Sr.’s Climate Science blog, a story of a poorly sited weather station, followed by leaving in the bad data when it is known to be bad. I’ve located the Laredo airport AWIS, more photos below. Guest … Continue reading

Posted in Climate data, Weather_stations | Tagged , , | 44 Comments

How not to measure temperature, part 50. How to make a rural station “urban”

One of the things that happens when your work becomes well known is that people send you things to look at. Such is the case for today’s subject. Here we have a NOAA COOP station which is on the side … Continue reading

Posted in Weather_stations | Tagged , , , , | 20 Comments

Inside the ASOS HO83 Temp/dewpoint sensor

HO83 ASOS Hygrothermometer (temperature/dewpoint sensor) Much has been written about problems with artificially high temperature readings due to the HO83 aspirated air temperature/dewpoint temperature sensor used on NOAA Automated Surface Observing Stations (ASOS). The most famous problem occurred in Tucson, … Continue reading

Posted in Weather_stations | Tagged , , , , | 6 Comments