However, the gradient wind over the region did begin to increase from the southwest during the afternoon ahead of the approaching low. No capping inversion is evident. Winds veered from south to northwest from the surface to 400 hPa but the wind speed was below 20 knots through this entire layer. Therefore, though thunderstorms were possible, they were unlikely to possess a strong mesocyclone at mid-levels. Michigan at 12Z on 15 August 1993.
Winds are in knots.
Data from surface stations in the region, including a project mesonet, showed that onshore flow began on the Lake Erie shore at 0825 EDT indicating the arrival of the lake breeze. The lake breeze winds were light at about 5 knots. The lake breezes from Lake Erie and Lake St. Clair resulted in opposing flow near Tilbury from 1020 EDT to 1455 EDT, or for 4 hours and 35 minutes. Surface winds and estimated lake breeze front positions at 1400 EDT, the time the landspout was occurring, are shown in Figure 3. The arrow points to Tilbury.