Saturday, October 31, 2015

Amazing data from the Europeans

The European Center for Medium Range Weather Forecast's computer models are world-renowned for their forecasting ability.  You likely hear it mentioned in current-day weather forecasts from meteorologists.  It gained a lot of attention during the days leading up to "Super Storm" Sandy.  Personally, I've been using the European computer model (ECMWF) since I first started to learn to forecast in 1997.  Since that time, it is the model I most lean on when putting together my forecasts.

It is pretty amazing the resources the European forecast office puts towards the computer model.  It is miles and miles ahead of what the United States puts towards its global forecast model, the GFS.
  • There are 21 member states and 13 co-operating states involved in the project.
  • The office has an annual budget of approximately $88-million.
  • Their system collects 40-million observations a day by more than 50 instruments.
  • Their medium-range computer model runs twice a day (morning and evening).
    • For the medium-range computer model, over 3-million points of data are ingested in to the computer model before it begins running calculations.
    • The supercomputers used operate with a sustained speed of 200 trillion floating point operations per second.
Here's a closer look at the data ingested in to just one computer model run.  Specifically, this is from the 0z June 3 run.
  • 69,627 surface observations
  • 9,296 buoy observations
  • 136,603 aircraft observations
  • 234,543 Infrared atmospheric motion vectors
  • 259,629 Water Vapor atmospheric motion vectors
  • 110,560 Visible atmospheric motion vectors
  • 1,314 Polar Infrared atmospheric motion vectors - Northern Hemisphere
  • 3,205 Polar Infrared atmospheric motion vectors - Southern Hemisphere
  • 348 Polar Water Vapor atmospheric motion vectors - Northern Hemisphere
  • 7,791 Polar Water Vapor atmospheric motion vectors - Southern Hemisphere
  • 638 balloon soundings
  • 3,340 Pilot-profiler soundings
  • 37,517 Microwave imager points
  • 700,651 AMSU-A Satellite soundings
  • 309,580 AMSU-B MHS Satellite soundings
  • 534,853 HIRS Satellite soundings
  • 511,896 SCAT Scatterometer points
  • 64,450 IASI Temp/Humidity profiles
  • 29,164 OZONE points
  • 424,882 GRAD Clear Sky Radiance points
  • 71,307 AIRS Atmospheric IR Sounding points
  • 80,789 GPSRO Precipitable water soundings
  • 57,023 Ground-based precipitable water soundings
TOTAL = 3,658,997 pieces of data

Thursday, October 29, 2015

Early look at what could come in November

I had some time to look over some loooooong range computer model data and make a few observations of what could come between October 28 - November 26 to central Indiana and the Midwest.

One thing to remember, you should take all of the thoughts with a MAJOR grain of salt. This is only one computer model's view over a long period of time and not reality. You should not get too hung up on details. Things can and likely will change.
  • We appear to be moving in to a pattern of upper-level storms coming off the Pacific Ocean and setting up show in the southwest United States before eventually moving east
    • Data suggests 5 of these upper-level storms affecting the Midwest November 2, 8, 10, 19 and 22.
  • Temperatures in the Midwest turn warmer November 3-7.
  • We have a period of above normal temperatures in the Central United States November 12-18.
    • Indiana could see above normal temperatures November 14-21.
  • Colder air arrives in Great Lakes (including Indiana) November 23-24.
  • Above normal temperatures in Indiana November 25-26.

Keep in mind, the model is just that. A computer model. The farther out the model looks, the higher the possible error rate. The key to look at this kind of data is not to look at specifics but instead trends and long wave patterns.

Wednesday, October 28, 2015

Change of Scenery

This post is LONG overdue.  In case you haven't already heard, I have moved to Indiana and I now working as a meteorologist for CBS4 (WTTV-TV) in Indianapolis, Indiana.  The move happened December 2014.

It is a great opportunity for me.  It is working for a great company.  It brings me back to the television station and the chief meteorologist where I interned (1997).  It brings me home.  I'm originally from central Indiana and have wanted to move back from the time I moved away.

You can normally find me on the CBS4 weekend evening news at 6pm and 11pm.  I also fill in a lot during the weekday evening news on CBS4 and also during the weekend evening on our sister-station FOX59.

Time permitting, I will continue to post information for Missouri, Illinois and Kentucky - especially for winter storm.  You can also get more timely updates from my via Twitter by following @johndissauer.  (You don't have to have a Twitter account to see the information, you can go to and read my tweets.)