... A cold front will will bring another round of showers and thunderstorms today, but will cool temperature back to seasonable levels. Another stretch of heat and humidity returns next week. More disturbances will continue rain chances through Monday.
NEAR TERM /THROUGH TODAY/... Made some grid updates to account for recent trends. Area of upper divergence ahead of the approaching trough axis is continuing some showers across southern portions of the CWA at this time. These will slowly continue eastward through the night. As surface low pressure swings across western Lake Erie, shower coverage across the north will increase by sunrise ahead of the approaching front. Temperatures were updated with a hi-res model blend.
Previous discussion... Showers and isolated thunderstorms will continue overnight as the center of a low pressure system lingers over Lake Erie. By this time, storms are expected to be non-severe due to the loss of daytime heating.
SHORT TERM /TONIGHT THROUGH 6 PM SUNDAY/... By early Saturday morning, the low pressure system mentioned above will swing across I-80 and morph into a weak trough. Scattered showers will continue but thunderstorm chances will be low due heavy cloud coverage should hinder destabilization sufficiently to keep storm strength in check.
A brief break in precipitation is expected Saturday night, but another shortwave dipping into the middle Ohio Valley will provide another round of showers and thunderstorms on Sunday. A strong shortwave and a good 850mb moisture feed may provide another soaking rain in some locations. Warm advection will help push temperatures a bit higher during the afternoon, into the mid 80s.
LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Continued troughing aloft will keep rain chances and seasonable temperatures in the forecast Sunday night and Monday. Thereafter, troughing over western Canada will help to drive 500mb heights upward across much of the eastern CONUS. Heat will return to our region, with the 90 degree level likely to be breached once again in most areas by Wednesday and Thursday. Rain chances will be limited to mainly isolated diurnal convection.