Heavy Snow for the North-Central U.S.; Bitter Cold and a Second Storm to Follow
Heavy snow will develop overnight in the Dakotas and move into northern Minnesota on Thursday. Light sleet and freezing rain accumulations will be possible south of the area of heavy snow from South Dakota into central Minnesota. Bitter cold temperatures will follow this weekend along with another storm impacting the Pacific Northwest starting Friday then moving down the Rockies through Monday.
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The gridded precipitable water plots (above) were created for the maximum, 99th percentile, 75th percentile, 50th percentile, and +2SD values. A separate GIS point shapefile was created for each of these categories, based on the latitude/longitude values of the sounding locations for each month. The point shapefiles were then interpolated to the gridded raster format using the following specifications:
a) Kriging interpolation method
b) Semivariogram: Circular
c) Number of points: 6
d) Grid resolution: 0.1 degrees
Due to increasing uncertainty in interpolated data at increasing distances from the point data source, caution should be used when taking a value from the precipitable water maps. Because of this, the border of the continentual Unites States was used to clip the completed grids.
The data on these plots has changed since the original plots were produced in 2011. This is due to a change in the interpolation method (to a geostatistical technique) as well as the additional of 3 more years of sounding data.
The data on these plots has changed since the original plots were produced in 2011. This is due to a change in the interpolation method (to a geostatistical technique) as well as the addition of 3 more years of sounding data.