EF1 tornado, Orchardville to Wynoose, Illinois, March 8, 2009

1. EF065 to 85 mph

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. EF186 to 110 mphthis tornado

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. EF2111 to 135 mph

   Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

4. EF3136 to 165 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. EF4166 to 200 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. EF5over 200 mph

   Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

7. Unrated

   The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

Rating

EF1

Date

March 8, 2009

Touchdown

12:42 PM CDT (17:42 UTC)

Lifted

12:56 PM CDT (17:56 UTC)

On the ground

14 minutes

Path length

14.4 miles (23.2 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

1

Property damage

$40,000

County

Wayne County

Touchdown point

38.417, -88.545

Lift-off point

38.571, -88.365

Record number

0903081142-01

A strong 500 mb shortwave moved rapidly northeast from the Plains during the day. The shortwave became a closed low over the Great Lakes region by the evening hours. In the lower levels, a strong southwest 850 mb jet from 60 to 65 knots shifted east from the Ozarks across southern Illinois. These features provided sufficient shear and instability for a significant tornado.

The tornado continued from Jefferson County just a short distance into Wayne County. A grain bin was thrown about 100 yards. A storage bin was toppled. A farm auger was knocked over. Metal decking or shingles were stripped off barns. There was shingle and siding damage to homes. Peak winds were estimated near 85 mph.

Intermittent damage was observed along the path of this tornado, which contained peak winds near 100 mph. Most of the damage was tree damage. Some trees were snapped and uprooted. Two structures were damaged, including a mobile home that was not tied down. The mobile home was rolled while a man was inside. He suffered broken ribs. The other damaged structure was a 40-by-60 foot storage shed. About one third of the shed was blown over a storage barn into a house, causing significant damage to the house. Debris was blown into a field across the street. A power pole was blown down. The tornado was witnessed about four miles north of Sims in the middle of a field. It was described as a black rotating cloud.

Several structures were damaged. Half of the roof was blown off one house. A well-built storage barn was blown into another house. Debris was blown several hundred yards. Debris from a house impacted a second house 250 yards away. The second house had only minor structural damage. A large metal barn partially caved in when a small grain elevator blew onto it. Peak winds were estimated near 122 mph. The tornado crossed into Clay County.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

11 minutes of warning. NWS PAH issued a tornado warning for this county at 17:31 UTC, 11 minutes before the tornado touched down, in force until 18:15 UTC.

The county was under a tornado watch, issued at 15:43 UTC and running to 19:16 UTC.

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The Storm Prediction Center had this point in a Moderate Risk, with a 0.10 chance of a tornado within 25 miles. The outlook in force was issued at 16:26 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

The Evansville,IN radar (KVWX), 69 km away, was scanning. The volume nearest the touchdown began at 17:39 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2009 tornado in IllinoisEvery tornado in Illinois since 1950Warnings in force in Illinois nowThe forecast where you are

25 more were confirmed in the United States that day.

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.