Bayani: Masanin hurricane William M. Gray da abokansa a Jami'ar Jihar Colorado suna ba da hasashen ayyukan guguwa a kowace shekara, daban da Hukumar Kula da Ruwa da Ruwa ta Kasa (NOAA). Kungiyar Gray ta ƙaddara matsakaicin yawan guguwa a kowace kakar tsakanin 1950 da 2000 ya zama 9.6 guguwa na wurare masu zafi, 5.9 guguwa, da 2.3 manyan guguwa (guguwa da suka wuce Rukuni na 3).
Jami'ar Jihar Colorado