The US National Weather Service predicts for Eureka,

Showers and Thunderstorms today. The greatest chance for thunderstorms will be north of Cape Mendocino late in the morning into the afternoon. Threats will include lightning, small hail, gusty winds, and heavy rain.

Remember, lightning can strike with little warning. When thunder roars, go indoors! If you see lightning or hear thunder, stay safe by: moving indoors or to a vehicle, postponing your outdoor activities, or seeking low lying areas if there are no buildings or vehicles nearby. Dark clouds may signal the potential for hail or heavy rain. If driving, slow down and ensure your headlights are on.