There are a few ways to find out if there is a severe weather alert in your area before leaving for the airport or taking any flight:
Check the website of your national meteorological service. For example, in the United States, you can check the National Weather Service. Make sure you check the weather in advance on websites like Windy, AccuWeather, MSN Weather
Check the website of your airline. Many airlines have pages on their websites that list current weather conditions and any severe weather alerts that may affect their flights.
Use a flight tracking app. There are many flight tracking apps available for smartphones and tablets. These apps often provide information about weather conditions along the flight path.
Listen to the news. Local news stations often report on severe weather alerts.