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Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA

Posted By admin On December 28, 2009 @ 4:18 am In Sci Tech | Comments Disabled

It has often been said that “Weather is not climate”, but ultimately it provides the only meaningful way to verify climate models. Did the climate models predict the cold, snowy weather [1] which has been seen across much of the US?

According to NOAA, October was the third coldest on record in the US [2], with almost every state showing temperatures from one to ten degrees below normal.  Some Parts of Colorado received record snowfall during October, starting the first week of the month.

Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA [3]

Image from HPRCC – University of Nebraska at Lincoln [4]

With a few days left, it appears that December is headed for a repeat, with temperatures ranging from one to fifteen degrees below normal.  (Note that the color scale is different from October, now the greens show more negative departure, even South Texas is at -6F)

Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA [5]

Image from HPRCC – University of Nebraska at Lincoln [6]

Temperatures for the rest of the month are forecast by NCEP to be below normal for almost the entire country, so it is unlikely that the map will change much before New Years Day.

Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA [7]

Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA 251109banner [8]

NCEP two week forecast [7]

So let’s compare the complete Autumn temperatures vs. the forecasts from NOAA’s Climate Prediction Center.  In August, CPC forecast that most of the US would have above normal temperatures from October through December, and perhaps more importantly did did not predict that any areas would have below normal temperatures.

Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA [9]

NOAA CPC Autumn Forecast [10]

As you can see below, their prediction was largely reversed from what has happened.  Most of the country has seen below normal temperatures during the same period.

Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA [11]

Image from HPRCC – University of Nebraska at Lincoln [12]

So my question is – if the climate models can’t reliably predict the next three months, what basis do they have to claim their ability to forecast 100 years out?  It is well known in the weather modeling community that beyond about three days, the models tend to break down due to chaos.

We have all heard lots of predictions of warmer winters, less snow, animal populations moving north, drought, dying ski resorts, etc.  But did anyone in the climate modeling community forecast the cold, snowy start to winter which has occurred. If not, it would appear that their models are not mature enough to base policy decisions on.

On the other side of the pond, The Met Office forecast 2010 to be the warmest year ever, as they last did in 2007.   On cue, the weather turned bitter cold immediately after the forecast and it appears that the unusally cold weather will continue at least through mid-January.  As in 2007, the Met office 2010 forecast is not getting off to a good start:

Our current weather: A test for forecast models – December shaping up to be one of the coldest on record in the USA [13]

http://wxmaps.org/pix/temp4.html [14]


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URLs in this post:

[1] snowy weather: http://wattsupwiththat.com/2009/12/27/877-new-snowfall-records-set-or-tied-in-the-usa-in-the-last-week/

[2] October was the third coldest on record in the US: http://wattsupwiththat.com/2009/11/11/ncdc-october-usa-temperatures-3rd-coldest-on-record-wettest-ever-on-record/

[3] Image: http://wattsupwiththat.files.wordpress.com/2009/12/conus_oct09_temp_departure.png

[4] Image from HPRCC – University of Nebraska at Lincoln: http://www.hprcc.unl.edu/products/maps/acis/Oct09TDeptUS.png

[5] Image: http://wattsupwiththat.files.wordpress.com/2009/12/conus_dec09_temp_departure.png

[6] Image from HPRCC – University of Nebraska at Lincoln: http://www.hprcc.unl.edu/products/maps/acis/MonthTDeptUS.png

[7] Image: http://wxmaps.org/pix/temp1.html

[8] Image: http://www.efoodsdirect.com/holidaySpecial.html?aid=14&adid=14

[9] Image: http://wattsupwiththat.files.wordpress.com/2009/12/cpc_autumn09_forecast.png

[10] NOAA CPC Autumn Forecast: http://www.cpc.ncep.noaa.gov/products/archives/long_lead/gifs/2009/200908temp.gif

[11] Image: http://wattsupwiththat.files.wordpress.com/2009/12/conus_oct09-dec09_temp_departure.png

[12] Image from HPRCC – University of Nebraska at Lincoln: http://www.hprcc.unl.edu/products/maps/acis/WaterTDeptUS.png

[13] Image: http://wattsupwiththat.files.wordpress.com/2009/12/ncep_eurotemp_1209-0110.png

[14] http://wxmaps.org/pix/temp4.html: http://wxmaps.org/pix/temp4.html

[15] NOAA on Miami Florida: Coldest December on Record: http://www.prisonplanet.com/noaa-on-miami-florida-coldest-december-on-record.html

[16] NCDC: October USA – temperature 3rd coldest on record, wettest ever on record: http://www.prisonplanet.com/ncdc-october-usa-%e2%80%93-temperature-3rd-coldest-on-record-wettest-ever-on-record.html

[17] U.S. Winter May Be Coldest in Decade, Commodity Weather Says: http://www.prisonplanet.com/u-s-winter-may-be-coldest-in-decade-commodity-weather-says.html

[18] Coldest December since records began in UK: http://www.prisonplanet.com/coldest-december-since-records-began-in-uk.html

[19] Beijing’s coldest December day in 57 years: http://www.prisonplanet.com/beijings-coldest-december-day-in-57-years.html

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