Storms prompt tornado watches in Indiana
A line of powerful storms swept through Indiana Thursday night, bringing high winds, hail, lightning and heavy rain.
A severe thunderstorm warning was in effect until 10:00 pm EST for:
HANCOCK, HENRY, MADISON, RANDOLPH, RUSH
ADAMS, BLACKFORD, GRANT, HAMILTON, JAY, TIPTON, WELLS
I-65 is closed in Frankfort (Clinton County) after a semi overturned. The semi is leaking propane.
A tornado watch issued for most of the area until midnight was canceled shortly before 10 p.m.
The combination of melting snow and warm air aloft continues to produce very low visibility north of Indianapolis where snow pack is deeper.
The flood threat remains high. It should be noted that wind and gusts will remain very strong post-frontal passage with a tightening pressure gradient field as this storm nears "bombogenesis" status.
The image below (via WxBell) shows the pressure gradient (packed "black" lines) and wind field at ~4,000 feet. These winds will occasionally "mix" down to the surface and produce gusts in excess of 45mph… which is why the Wind Advisory runs for most of Friday.
As mentioned many times this week, the warmth today is nothing more than a spring tease… with a return to an Arctic flow setting up next week. This will pose timing problems for quick-moving upper disturbances that may trigger some snow. The first of these features arrives sometime this weekend, possibly as early as Saturday afternoon. While the GFS and Euro show only minor amounts of show, it should be noted the Canadian model (which has a done a decent job of late) shows more appreciable snow (>2-3″) moving through Sunday.
For now I'll leave with cold hard facts in the latest 7 day forecast. Plenty of winter to endure as we truly earn our Spring Fever this year.