* frame-grab up top from RadarScope app showing Friday's evening's bow echo courtesy of WeatherNation meteorologist Todd Nelson. When you see an approaching thunderstorm blob that looks like a horse-shoe, bulging into a spear-like point as it accelerates forward, it's time to head for the basement. Potentially damaging winds are imminent.
- They frequently appear almost simultaneously with cloud-to-ground lightning discharge
- They are generally spherical or pear-shaped with fuzzy edges
- Their diameters range from 1–100 cm, most commonly 10–20 cm
- Their brightness corresponds to roughly that of a domestic lamp, so they can be seen clearly in daylight.
- Minnesota climate scientist Greg Laden