Lake Michigan lake breeze

June 5th, 2019 |

GOES-16 “Red” Visible (0.64 µm) images, with hourly surface wind barbs plotted in cyan, temperatures plotted in yellow and SPC Storm Reports plotted in red [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm) images, with hourly surface wind barbs plotted in cyan, temperatures plotted in yellow and SPC Storm Reports plotted in red [click to play animation | MP4]

GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) showed the formation of a lake breeze along the western shore of Wisconsin — in the wake of a cold frontal passage — on 05 June 2019. This lake breeze enhanced surface convergence, which played a role in the formation of a thunderstorm that produced hail as large as 2.50 inches in diameter when a prominent overshooting top was evident (NWS Green Bay).

The lake breeze also caused sharp drops in surface air temperature — from low 80s to middle 50s F — along with fog reducing visibility to 0.5 mile or less at Milwaukee and Racine in southeastern Wisconsin (below). The arrival of lake breeze fog also restricted the visibility to 0.5 mile or less at Waukegan in northeastern Illinois.

Time series plot of surface reports from Milwaukee Mitchell International Airport [click to enlarge]

Time series plot of surface report data from Milwaukee Mitchell International Airport [click to enlarge]

Time series plot of surface reports from Racine Batten International Airport [click to enlarge]

Time series plot of surface report data from Racine Batten International Airport [click to enlarge]

Mesoscale vortex along the Texas coast

June 5th, 2019 |

GOES-16 “Red” Visible (0.64 µm) images, with hourly surface wind barbs plotted in cyan [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm) images, with hourly surface wind barbs plotted in cyan [click to play animation | MP4]

GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) revealed a mesoscale vortex near the Texas coast (in the general vicinity of Houston) on 05 June 2019. This could have been a Mesoscale Convective Vortex (MCV), but there is evidence to suggest that it was a remnant circulation of what was Tropical Invest 91L a few days earlier.

Using a 3-hourly 850 hPa Relative Vorticity product from the CIMSS Tropical Cyclones site (below), the northward migration of vorticity associated with Invest 91L could be followed from the Bay of Campeche on 02 June to the Texas coast on 05 June.

850 hPa Relative Vorticity product, from 00 UTC on 02 June to 00 UTC on 06 June 2019 [click to play animation]

850 hPa Relative Vorticity product, from 00 UTC on 02 June to 00 UTC on 06 June 2019 [click to play animation]