October 26, 2010 Severe Storms & Tornadoes from Extremely Deep Low Pressure

Overview   |    Tornadoes    |     Severe Winds    |     Peak Wind Gusts


Overview

Map of October 26, 2010

A very powerful, near-record low pressure system over Minnesota pushed a cold front across northern Illinois and northwest Indiana on the morning of Tuesday, October 26th, 2010 which aided in the development of strong to severe thunderstorms.  Thunderstorms stretched all the way from northern Wisconsin across Illinois and into Missouri.  Storms intensified in a line as they crossed northern Illinois just prior to daybreak.  Several storms were able to develop rotating updrafts which can lead to wind damage and, in some cases, tornadoes.  Numerous reports of damage were received from a variety of areas including Kane, Will, Kankakee, and Iroquois Counties in Illinois and in Porter County in Indiana. 

The 955.2 millibar pressure at the deepest time of this low pressure recorded in Bigfork, Minnesota on October 26, 2010 appears to be the lowest extratropical sea level pressure on the record books in the mainland United States, excluding the west and east coasts.

For more on the pressure of this system and how it stacks up with U.S. records, please visit this page by the NWS Duluth:  http://www.crh.noaa.gov/dlh/?n=101026_pressurerecords

The radar image below shows the expansive line of showers and thunderstorms associated with the deep low and attendant cold front at 7 AM CDT/8 AM EDT on October 26th.  The white circular lines show the strong low pressure which is centered over north central Minnesota in this image.

12z Surface Map and Radar Mosaic


Tornadoes

Peotone Tornado (EF 2)

A tornado rated at EF 2 strength on the enhanced Fujita tornado scale was confirmed by National Weather Service Meteorologists surveying the damage.

A tornado touched down between Peotone and Beecher at 7:40 am the morning of October 26th... about 4 miles east of Peotone.  The tornado's path length was surveyed to be 2.9 miles...with a path width of 200 yards.  The tornado produced its most intense damage at 30651 South WIll Center Road removing a house's roof...collapsing exterior walls on the second floor of the house... and completely destroying a garage and 2-3 other outbuildings.  Four power poles were also downed just northeast of the area along Peotone-Beecher Road.  Additional EF1 and EF0 damage was found along a path running southwest toward Kennedy Road.  This damage consisted of collapsed outbuildings, snapped cedar trees, and minor damage to homes.

Damage path of EF2 tornado east of Peotone, IL

  

EF2 tornado damage east of Peotone
EF2 tornado damage to home east of Peotone, IL

EF2 damage east of Peotone
EF2 tornado damage to farm outbuildings east of Peotone, IL, looking northeast

EF2 debris path east of Peotone
Debris path from EF2 tornado east of Peotone, IL, looking northeast toward Peotone-Beecher Road

Funnel cloud near Peotone. Photo courtesy Carol Cantone.

 Radar Reflectivity

    Radar Velocity  

reflectivity image

Elburn Tornado (EF 1)

A tornado rated at EF1 on the enhanced Fujita tornado scale was confirmed by a National Weather Service storm survey team surveying the damage near Elburn, IL.

A tornado touched down about 2 miles northwest of Elburn in Kane County at 6:55 AM on October 26th.  The tornado's path length was surveyed to be about 3/4 of a mile... with a path width of 50 yards. Two barns and a grain bin were destroyed along with a pole snapped at the base at one farmstead... and there was damage to a homestead two other farmsteads nearby.  Debris from some of the damaged structures was blown 1/4 mile downstream. 

Map of tornado path near Elburn

Map of tornado path near Elburn, IL

EF1 damage near Elburn, IL
EF1 tornado damage northwest of Elburn, IL.  Photo by Andrew Pritchard.

Malden-Kouts Tornado (EF 0)

Another tornado rated at EF 0 strength was confirmed by an NWS survey team surveying the damage between Malden and Kouts in Porter County, IN.

This tornado touched down 4 miles southeast of Malden at 8:33 AM on October 26th.  The tornado's path length was surveyed to be about 200 yards... with a path width of 30 yards.  One outbuilding was damaged by this tornado. 

 

Ashton Tornado (EF 1)

A fourth tornado rated at EF 1 was confirmed by a NWS survey team surveying the damage 3 miles southeast of Ashton in Lee County, IL.

A tornado touched down near Meridian Road southeast of Ashton at approximately 5:41 AM on October 26th. The tornado's path length was surveyed at 0.8 miles long with a debris path that was 50 yards wide, convergent and narrow. Some of the damage included a couple of outbuildings with poor structural integrity, and a few that had their roofs ripped off. The top of a metal silo was 'punched' in and a grain cart was flipped on to its side. In addition to the structural damage, numerous 2x4's were speared into the ground and metal siding was strewn into the fields to the northeast of the farm. The winds were estimated to be at 95 MPH.

Lee County EF1 Path
Path of EF1 tornado in Lee County (roughly a mile long, with EF1 damage only at the start).

 

EF1 tornado damage southeast of Ashton, IL.

The Fujita Scale

The EF tornado scale is used to assign a tornado a rating based on estimated wind speeds and related damage.  When tornado related damage is surveyed... it is compared to a list of damage indicators and degrees of damage which help estimate better the range of wind speeds the tornado likely produced.  From this... a rating (zero to five) is assigned.  


 Local Storm Reports

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
224 PM CDT THU OCT 28 2010
..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..
0633 AM     NON-TSTM WND GST 3 NNW DIXON             41.89N 89.51W
10/26/2010  M71.00 MPH       LEE                IL   TRAINED SPOTTER

            RECORDED BY COCORAHS OBSERVER.
0953 AM     NON-TSTM WND DMG WOODSTOCK               42.31N 88.44W
10/26/2010                   MCHENRY            IL   PUBLIC

            TREE BRANCHES DOWN.
1028 AM     NON-TSTM WND GST WAUKEGAN                42.37N 87.87W
10/26/2010  M62.00 MPH       LAKE               IL   ASOS
1103 AM     NON-TSTM WND GST PERU                    41.34N 89.13W
10/26/2010  M58.00 MPH       LA SALLE           IL   AWOS
1110 AM     NON-TSTM WND GST 5 SSE BEACH PARK        42.36N 87.81W
10/26/2010  M56.00 MPH       LMZ740             IL   OFFICIAL NWS OBS

            49 KNOT GUST MEASURED AT WAUKEGAN HARBOR GLOS WEATHER
            STATION.
1215 PM     NON-TSTM WND GST 4 NE CHICAGO            41.92N 87.57W
10/26/2010  M75.00 MPH       LMZ741             IL   C-MAN STATION

            65 KNOT GUST MEASURED AT CHICAGO CRIB.
0100 PM     NON-TSTM WND GST 3 NE TOWN OF PINES      41.73N 86.91W
10/26/2010  M62.00 MPH       LMZ046             IN   C-MAN STATION

            53 KNOT GUST MEASURED AT MICHIGAN CITY C-MAN STATION.
0510 PM     NON-TSTM WND DMG 1 NE ELBURN             41.90N 88.46W
10/26/2010                   KANE               IL   TRAINED SPOTTER

            POWER LINE FELL ONTO A HOUSE...RESULTING IN A LARGE FIRE
            ON A FARM ALONG IL-38.
1230 PM     NON-TSTM WND DMG YORKVILLE               41.64N 88.45W
10/27/2010                   KENDALL            IL   FIRE DEPT/RESCUE

            WIND GUST GREATER THAN 50 MPH AT FIRE HOUSE. A 6 FT LONG
            BRANCH /GREATER THAN 12 INCHES IN DIA/ FELL ON A
            RESIDENTIAL DRIVEWAY.
0200 PM     NON-TSTM WND GST 3 NNW BURNS HARBOR      41.65N 87.15W
10/27/2010  M55.00 MPH       LMZ745             IN   OFFICIAL NWS OBS

            48 KNOT GUST MEASURED AT BURNS HARBOR GLOS WEATHER
            STATION.
0206 PM     NON-TSTM WND GST WAUKEGAN                42.37N 87.87W
10/27/2010  M61.00 MPH       LAKE               IL   ASOS
0243 PM     NON-TSTM WND GST PERU                    41.34N 89.13W
10/27/2010  M58.00 MPH       LA SALLE           IL   AWOS
0250 PM     NON-TSTM WND GST 5 SSE BEACH PARK        42.36N 87.81W
10/27/2010  M56.00 MPH       LMZ740             IL   OFFICIAL NWS OBS

            49 KNOT GUST MEASURED AT WAUKEGAN HARBOR GLOS WEATHER
            STATION.

0345 PM     NON-TSTM WND GST GALE                    41.60N 87.34W
10/27/2010  M61.00 MPH       LAKE               IN   AWOS
0400 PM     NON-TSTM WND GST 4 NE CHICAGO            41.92N 87.57W
10/27/2010  M76.00 MPH       LMZ741             IL   C-MAN STATION

            66 KNOT GUST MEASURED AT CHICAGO CRIB.
0420 PM     NON-TSTM WND DMG DE KALB                 41.93N 88.75W
10/27/2010                   DEKALB             IL   TRAINED SPOTTER

            ROOF BLOWN OFF OF AN APARTMENT BUILDING ON GREENBRIER RD.
0515 PM     NON-TSTM WND GST 3 NE TOWN OF PINES      41.73N 86.91W
10/27/2010  M64.00 MPH       LMZ046             IN   C-MAN STATION

            56 KNOT GUST MEASURED AT MICHIGAN CITY C-MAN STATION.
0819 PM     NON-TSTM WND GST ROCKFORD                42.27N 89.06W
10/27/2010  M58.00 MPH       WINNEBAGO          IL   ASOS


Peak Wind Gusts from Non-Thunderstorm Winds

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
1202 PM CDT THU OCT 28 2010/102 PM EDT THU OCT 28 2010/

...ANOTHER DAY OF STRONG WINDS ON WEDNESDAY...

IT WAS ANOTHER WINDY DAY AS STRONG WINDS ASSOCIATED WITH THE STORM
SOME ARE DUBBING "CHI-CLONE 2010" CONTINUED TO BUFFET THE AREA.

HERE IS A SUMMARY OF THE OFFICIAL PEAK WIND GUSTS RECORDED FROM ASOS
SITES AROUND THE REGION WEDNESDAY...

WAUKEGAN       - 61 MPH (206 PM)
ROCKFORD       - 58 MPH (819 PM)
AURORA         - 55 MPH (320 PM)
MIDWAY         - 55 MPH (336 PM)
O`HARE         - 55 MPH (350 PM)
WEST CHICAGO   - 54 MPH (112 PM)
VALPARAISO     - 53 MPH (246 PM)
WHEELING       - 51 MPH (210 PM)


THE FOLLOWING IS A LIST OF MAXIMUM WIND GUSTS REPORTED AT AREA AWOS
SITES. NOTE: THESE SITES ARE NOT QUALITY CONTROLLED BY THE
NATIONAL WEATHER SERVICE. ALSO...AWOS SITES DO NOT REPORT PEAK
WINDS AND THE MAXIMUM WINDS HERE ARE BASED ON OBSERVATIONS
TRANSMITTED EVERY 20 MINUTES.

GARY           - 61 MPH (345 PM)
LASALLE/PERU   - 58 MPH (243 PM)
LOCKPORT       - 54 MPH (245 PM)
LANSING        - 53 MPH (244 PM)
PONTIAC        - 52 MPH (225 PM)
MORRIS         - 51 MPH (225 PM)
STERLING       - 50 MPH (435 PM)
KANKAKEE       - 50 MPH (244 PM)
DEKALB         - 47 MPH (205 PM)
JOLIET         - 46 MPH (243 PM)
ROCHELLE       - 45 MPH (345 PM)

THE FOLLOWING PEAK WIND GUSTS ARE FROM VARIOUS PRIVATE AND SCHOOL
WEATHER STATIONS AND ARE ALSO NOT QUALITY CONTROLLED BY THE NATIONAL
WEATHER SERVICE.

NAPERVILLE       - 56 MPH
GLENVIEW         - 54 MPH
LINCOLNSHIRE     - 53 MPH
MATTESON         - 53 MPH
MINOOKA          - 52 MPH
SAUK VILLAGE     - 52 MPH
WGN TV           - 52 MPH
GENEVA           - 51 MPH
LIBERTYVILLE EOC - 51 MPH
MARSEILLES       - 51 MPH
WHEATON          - 51 MPH
WAUKEGAN         - 50 MPH
ALGONQUIN        - 50 MPH
SCHAUMBURG       - 49 MPH
ORLAND PARK      - 49 MPH
MCHENRY          - 49 MPH
ADDISON          - 48 MPH
DEKALB           - 47 MPH
GURNEE           - 46 MPH
ITASCA           - 46 MPH
LINDENHURST      - 45 MPH
ELGIN            - 45 MPH
FOX LAKE         - 45 MPH
BUFFALO GROVE    - 44 MPH
LAGRANGE         - 44 MPH
PARK RIDGE       - 43 MPH
RENSSELAER       - 43 MPH
ONARGA           - 41 MPH

THE FOLLOWING ARE MAXIMUM WIND GUSTS RECORDED ON WEDNESDAY AT LAKE
MICHIGAN MARINE WEATHER STATIONS AND BUOYS OWNED AND MAINTAINED BY
NOAA.

CHICAGO CRIB (~85` EL)    - 76 MPH/66 KNOTS (400 PM)
MICHIGAN CITY (~70` EL)   - 64 MPH/56 KNOTS (515 PM)
NORTH BUOY (~11` EL)      - 59 MPH/51 KNOTS (950 AM)
WAUKEGAN HARBOR (~30` EL) - 56 MPH/49 KNOTS (250 PM)
BURNS HARBOR (~33` EL)    - 55 MPH/48 KNOTS (200 PM)
SOUTH BUOY (16` EL)       - 52 MPH/45 KNOTS (850 PM)
CALUMET HARBOR (~30` EL)  - 51 MPH/44 KNOTS (154 PM)

 

 For more on this event, please see this thorough review from the NWS Duluth office.

NWS Chicago Past Events & Science Page



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