Local Weather:
NWS Sioux Falls Forecast Office
NWS Forecast for Vermillion (current conditions in Yankton)
NWS Forecast and current conditions for Sioux Falls, South Dakota
NWS Forecast and current conditions for Sioux City, Iowa
Weather Channel for Vermillion 10-day forecast
Weather Channel for Sioux Falls 10-day forecast
SDSU Mesonet Automatic Weather Stations -Real Time Weather
NWS surface analysis north-central region
Sioux Falls Climate Graphs (with daily weather and climate)
Road Conditions: South Dakota 511 (DOT)
Discussion of NWS forecast for Sioux Falls area
National Weather:
Current NWS continental U.S. analysis
Upper Air Forecasts from Pivotal Weather
Jetstream Forecast from Weatherstreet
CoCoRaHS (Community Collaborative Rain, Hail & Snow Network)
National Center for Atmospheric Research (real-time weather data)
Hurricane Tracking from spaghettimodel.org
NWS National Snow Analysis (satellite-based)
NOHRSC Interactive Snow Information
Midwestern Regional Climate Center: Accumulated Winter Season Severity Index (AWSSI)
Climate Prediction Center (ENSO & seasonal forecasts)
EarthWindMap with color dynamic flow lines
EarthWindMap with dynamic flow lines for jetstream
NWS Forecast for High Prairie, WA (current conditions for Centerville, WA)
Cloud classification in the World Meteorological Organization's Cloud Atlas
Blogs:
Updraft (Minnesota Public Radio)