21. The ice crystals in cirrus clouds have different shapes in addition to different sizes. 22. These high cirrus clouds may be the first signs of an approaching tropical cyclone. 23. Patches of cirrus clouds and coastal fog may dull the weather along the Coast. 24. Like other cirrus clouds , cirrus fibratus occur at high altitudes. 25. Cirrus clouds typically form between 20, 000 and 50, 000 feet above sea level.26. Thin cirrus clouds can also indicate high probability of CAT. 27. Individual cirrus cloud formations can be the remnants of anvil clouds formed by thunderstorms. 28. Even light cirrus clouds reduce this to 50 %, stronger cirrus clouds to 40 %. 29. Filaments of high, thin cirrus clouds will block the sunshine at times across the region. 30. A veil of cirrus clouds will obscure the sun from Texas to the interior Southeast.
