The two tropical waves discussed last week developed. Nana strengthened southwest of the Cape Verde Islands over the weekend, but strong shear is quickly ending its chances for survival. Tropical Depression 15 formed this morning and could become Tropical Storm Omar tonight. Wind shear is still somewhat moderate and isn't expected to weaken much. Due to this, some very slight strengthening is possible, but I don't foresee significant strengthening. The GFDL and HWRF forecast T.D. 15 to become a hurricane within the next 24 hours, but I feel this is a bit unreasonable. Still, T.D. 15 could become a hurricane within a few days as shown by the NHC forecast. A weakness in the subtropical ridge will prevent this system from impacting the U.S., but it may bring heavy rain and tropical storm force winds to Puerto Rico.
The big Western U.S. trough delivered snow as advertised to Montana, Wyoming, Idaho, and the Dakotas. In fact, snowfall totals up to 48" were reported in the mountainous areas of Southern Montana! Check out the map above from NWS Riverton for snow totals in their CWA.
NWS Billings, MT ReportsNWS Bismarck, NDNWS Riverton, WY
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