NWS Forecast Office Tucson, AZ

There is a 50-80% probability of winds in excess of 70 mph (HREF and REFS) hugging locations immediately to the W/NW of the higher terrain. This scenario may result in sustained damaging winds to those locations and should be taken very seriously. This is an anomalously strong event! Those with wind-vulnerable property should take the necessary precautions and secure their items. Although the strongest winds may be focused immediately downstream of the higher terrain, terrain gaps and east-west oriented valleys will also be susceptible to strong winds given the magnitude and duration of the low-level pressure gradient. A High Wind Warning is in effect from 11 PM MST this evening through 11 PM MST Friday from eastern Pima County eastward. A Wind Advisory will then be in effect from 11 PM MST Friday through 2 PM MST Saturday afternoon. Expect east to southeast winds 30-45 mph with gusts 50-70 mph. These winds could lead to downed trees and power poles as well as areas of blowing dust. High profile vehicles should also exercise caution when driving in strong cross-winds.

This is not the typical wind event we see impacting Southeast Arizona. This one will be significant due to the stable air just above the mountains funneling the winds back down the leeward side of the higher terrain. Attached is a graphic to help explain why we are expecting winds on the other side of the terrain instead of those locations being blocked like we see in normal east wind events.

Due to the increased winds Friday there can be lofted areas of blowing dust. Limit physical activity to reduce heavier breathing, which allows for particulate matter to penetrate deeper in the lungs.