OVERNIGHT STORMS POSSIBLE
An area of showers and storms are expanding northeast from southern Indiana at 10PM. This cluster of storms will reach south central Indiana after 12AM with the northern flank of these storm expected in the city around midnight as well. A few gusty storms are possible within this complex of storms along with vivid lightning and locally heavy downpours.Wide spread severe weather is not expected but a few stronger storms could impact south-cental Indiana through 4AM.Hi resolution short-range forecast models indicate 2 waves of showers and storms overnight. First one reaches city around 12 AM then eases by 3AM. A break from 3AM to 5Am is possible with a new cluster of storms coming north arriving around 5AM through 7AM. Expect wet road ways for the early commute. New showers and storms are likely Wednesday afternoon.
TWO BRIEF TORNADOES EARLY TUESDAY MORNING
Overnight gusty storms which toppled trees and power lines also produced two weak tornadoes around 3 a.m. in Putnam County.
From the National Weather Service survey team:
“A NWS Indianapolis storm damage survey today identified at least one weak tornado occurring west of Brownsburg near North Salem in the storms early this morning. Toppled trees, snapped limbs, and damage to a barn revealed evidence of rotation in the winds and damage consistent with an EF0 tornado with winds up to 85 mph. The tornado occurred around 2:40 A.M. early this morning and was part of a large line of storms that swept across central Indiana overnight causing sporadic damage in many areas.
“Surveying in the Roachdale area north of Greencastle also yielded evidence of an EF0 tornado. This occurred around 2:30 A.M. just south of Roachdale where barn, shed and tree damage were observed suggesting rotating winds of up to 85 mph. This tornado was on the ground for less than a quarter mile.
“Additional damage survey work in southern Hendricks County southwest of Plainfield revealed two separate paths of straight-line wind damage paralleling both sides of US 40 east of Stilesville. Damage in Hazelwood, the southern-most of the two tracks, also offered evidence of a microburst, intense damage over a short and narrow path.”
KILLER TORNADO RATED AN EF-5
Survey of the Moore, Okla., tornado damage was updated Tuesday afternoon and rated as a rare EF-5. The estimated winds were 200 to 210 mph. The 1999 EF-5 was rated at 315 mph but under the old rating scale changed in 2007.
The wedge tornado was on the ground for 17 miles lasting with a stunning width of 1.3 miles. It was on the round for 50 minutes. The death toll at 24 is expected to rise.
This marked only the 59th time in 60 years that an EF-5 tornado has touched down in the U.S. The last was in Guthrie, Okla., two years ago on May 24,2011 and two days after the Joplin, Miss., tornado that claimed 158 lives.
TWO COLD FRONTS COMING ENDING THE STORMY PATTERN
The stretch of warm and humid air is in its eighth day and since last Thursday, the severe weather season really ramped up. More than 1,300 severe weather reports have been received nationwide with a preliminary tornado count at 82.
The passage of a cold front Wednesday evening will bring a big drop to the severe weather threat starting Wednesday night. Much cooler air will filter into the state behind a second cold front Thursday. This second front may trigger a few storms with a small threat of hail in the afternoon.
GREAT OPEN TO RACE WEEKEND – RAIN THREAT LINGERS
Chilly air will arrive behind a second cold front Thursday evening as the holiday weekend gets underway. A beautiful Carb Day is expected with sunshine and very mild air. Temperatures through the long holiday weekend may struggle to crack 70°.
A warm front will inch north early Saturday. It will then stall across the southern half of the state. Along this front, occasional showers and thunderstorms may roam into early Sunday. The impact on Race Day is still unclear at this distance but will be firmed up over the next few days.
Showers and thunderstorms could return as early as Saturday and possibly linger into Sunday.
There will be a huge difference in temperatures this race weekend. The entire race weekend in 2012 included smothering heat and humidity. From Carb Day through Race Day, the heat index at times reach the upper 90’s. The official temperature race Sunday reached 91°, just shy of the hottest race on record (92° 1937).