Texas

The September 12, 2020 Land Surface Temperature (LST) map  for the northwest portion of Houston, which is shown below, was created using Landsat Analysis Ready Data from USGS. The original Kelvin temperatures have been converted to Fahrenheit.  LST temperatures below 100ºF have been group together and are colored light blue. LST temperatures from 100ºF to 130ºF have been grouped in 5ºF increments.  The LST temperatures from 130ºF to 155ºF have been grouped as polygon areas. This has been done to reduce the file size, which improves web site performance. The reduced file size takes about one minute to load into your web browser (depending on your network). Please be patient.

Click on the map image below to access the dynamic Urban Heat Island map. A new window will open for each click on the map below.

Note: The ambient air temperature in Houston for the day of September 12, 2020 was: Average (85 ºF); Max (96 ºF); Min (77 ºF).  The time of this Landsat data collection was at ~ 5:00 pm (for the center of the Landsat scene). The ambient air temperature at this time was ~ 93 ºF. See this  web site link for more details.


The ERCOT chart below shows the proportion (percent) of power contributed to the Texas ERCOT power grid by the six energy sources (Natural Gas, Wind, Solar, Coal, Hydro, and Nuclear) from January 20, 2021 to February 19, 2021. A temperature chart, shown above the ERCOT chart, is matched with the dates of the ERCOT chart, and shows the loss of wind power associated with the dramatic temperature decline from Feb 9, 2021 to Feb 19, 2021.

The ERCOT chart was produced using data from the U.S. Energy Information Administration. The hourly MWh data for each power source was converted to a percent of the total hourly MWh data for all six power sources.



The Texas Wind Turbine Area map was produced using data from the U.S. Geological Survey. The locations of the wind turbines were used to create a 1/2 mile buffered polygon around each wind turbine installation area. The  USGS data includes the year when each wind turbine was installed. The year data was used to identify the range of years that wind turbines were installed within each polygon area. The first installed wind turbine within a polygon area provides the First Year Build (FirstYrBLD). The last installed wind turbine within a polygon area provides the Last Year Build (LastYrBLD).  In many cases, the First Year Build & the Last Year Build are the same. The total number of wind turbines within a polygon are shown as the Tower Count. The interactive map provides this information by simply moving your cursor over the wind tower polygon of your choice.

Click on the map image below to access the interactive Texas Wind Turbine map. A new map window will open for each click.

https://eerscmap.usgs.gov/uswtdb/data/


The Texas Wind Turbine Area map shown below was produced by using data from the U.S. Geological Survey Wind Turbine Data, the NOAA Daily Temperature Grid and ERCOT Regional Boundary Map. The locations of the wind turbines were used to create a 1/2 mile buffered polygon around each wind turbine installation area. The total number of wind turbines within a polygon are shown as the Tower Count in the interactive map. The temperature map was created using the daily maximum temperature data for each day, starting on February 7th and ending on February 21st. Temperature cell grids for each day, with a maximum value of 32ºF or less, were saved as a new map and assigned a value of 1. Map algebra was used to combine all the daily maps and create the final map where each cell shows the total number of days when the maximum daily temperature was below freezing. The ERCOT Regional Map was used to identify the individual counties within the ERCOT Regional Map.  The  interactive map provides access to the details of this information. 

Click on the image below to access the interactive Texas Wind Turbine & Temperature map. A new window will open for each click.



The table shown below was produced using data from the Texas Wind Turbine & Tmax map. The "Day Count when Tmax was below freezing" column is associated with the wind turbine count that experienced that specific number of days with maximum daily temperatures at or below freezing, from February 7th to February 21st. This analysis was completed by doing a geographical relational join between the Tmax Day Count polygon layer and the individual wind turbine point layer . This relational join allowed each wind turbine in the mapping point layer to "inherit" the "Day Count when Tmax was below freezing" value associated with the Tmax polygon layer.


The Texas wind speed map shown below was produced at the National Renewable Energy Lab.