Weather Forecaster Guide: Sioux City Iowa

Many forecasters new and old run across certain things that just don’t get picked up in the weather models that we use to prepare our weather forecast. This is why I have created weather guides for anyone that is getting ready to or just wants to find out more about the weather in their area.

(Here are a few forecaster guide tips to helping prepare a better weather forecast)


North: Look for a gradual rise.
South: Look for no major elevation changes.
West: There is a moderate rise as you leave the basin.
East: Significant rise with moderate size hills on the east side.


    Northerly component will bring in cooler air during the summer, and cold air in the winter.
    Southerly component will bring in warmer conditions all year round.
    Westerly component will bring in a slight warming trend followed by a cooling trend.
    Easterly component will bring in the potential for the city to see warming due to descending air by a couple of degrees.


      Northerly winds lack the moisture and are more familiar with bringing dry air.
      Southerly winds will bring an increase in moisture to the local area.
      Westerly winds will bring in the potential for seeing a slight increase in precipitation amounts due to the small terrain enhancement of the area.
      Easterly winds will bring in increased moisture, however the city itself may see a lighter amount than places to the east due to the small terrain enhancement.

        Storm Index Values:
        (0= Little Impact    1= Slight Impact    2= Moderate Impact    3=Major Impact)

        Storms arriving from the west will tend to have a value of 2-3 during the summer months with enhanced chances of seeing severe weather.
        Storms arriving from the south during the summer will have a 1 for impact as most of the time the system is turning into an occlusion which makes the worst weather further west of the area, however in the winter this could be a setup for a 2-3 as this is a major winter weather maker from snow and ice.
        Storms arriving from the north during the summer and winter would have a 1 for impact as most of the time they are dry systems and only produce small amounts of moisture.
        Storms arriving from the east would be in the 0-1 area for impact because it is very rare to see storms move in this degree of motion into the local area, due to the westerly flow aloft.

 Meteorologist Joshua Kelly