Six Tornadoes in Northern Illinois Confirmed by National Weather Service Chicago — All EF-1

Widespread wind damage, some of it significant, occurred across northern Illinois and northwest Indiana with a strong second round of storms between 8:30 pm and 11 pm. on Monday, June 30, 2014.

A total of six total tornadoes are confirmed within the embedded strong winds across northern Illinois, including five in the NWS Chicago Forecast Area.

All northern Illinois tornadoes were rated as EF-1 in intensity.

The extensive damage sustained from two separate lines of thunderstorms on Monday, June 30th has been officially determined to be from two separate derecho events. During these two events, 80-100 MPH straight line winds along with several tornadoes of EF-1 intensity produced wind damage from Central Iowa east into Michigan and Ohio. The first Derecho event passed through Chicagoland from about 5:00 p.m. to 7:00 p.m. The second Derecho event passed through Chicagoland from about 9:00 p.m. to 11:00 p.m.

Rainfall in Arlington Heights …

24-hour rainfall amounts were highest in parts of Cook, DuPage, and Kane Counties and Lake County in Indiana, with 2-3″. There were isolated higher amounts, including 4.12″ in Winnetka and 3.16″ in Gibson City.

Following are tornado reports in the Chicago area (Earlville, Southwest Kendall County, Plainfield & Romeoville, Grant Park Area (2). The sixth tornado was outside the Chicago area in Thomson, Illinois near the Mississippi River in northwest Illinois.

…EARLVILLE AREA EF-1 TORNADO IN NORTHERN LASALLE COUNTY…

RATING:                 EF-1
ESTIMATED PEAK WIND:    110 MPH
PATH LENGTH /STATUTE/:  1.5 MILES
PATH WIDTH /MAXIMUM/:   50 YARDS
FATALITIES:             NONE
INJURIES:               NONE

START DATE:             JUNE 30 2014
START TIME:             916 PM CDT
START LOCATION:         1.5 MILES WEST OF EARLVILLE
START LAT/LON  :        41.5886/-88.9526

END DATE:               JUNE 30 2014
END TIME:               917 PM CDT
END LOCATION:           0.5 MILES SOUTHWEST OF EARLVILLE
END_LAT/LON:            41.5849/-88.9239

AFTER VIEWING AERIAL PHOTOS FROM LOCAL MEDIA OF CONVERGENT SWIRLING
AND SCARRING ON THE SOUTHWEST EDGE OF TOWN…A SHORT LIVED TORNADO
HAS BEEN CONFIRMED TO HAVE TOUCHED DOWN EMBEDDED WITHIN AN AREA OF
WIDESPREAD STRAIGHT LINE WIND DAMAGE NEAR EARLVILLE.

NUMEROUS TREES WERE DOWNED THROUGHOUT THE AREA.
A GARAGE WAS BLOWN OUT ON THE SOUTHWEST PART OF TOWN.IN ADDITION TO THE BRIEF TORNADO…THERE WAS WIDESPREAD STRAIGHT LINE WIND DAMAGE ACROSS EARLVILLE AND SURROUNDING AREAS. SOME OF THE MOST INTENSE STRAIGHT LINE WIND DAMAGE WAS CONSISTENT WITH WIND SPEEDS OF 80 TO 100 MPH.

Southwest Kendall County
…EF-1 TORNADO IN FAR SOUTHWEST KENDALL COUNTY…

RATING                  EF-1
ESTIMATED PEAK WIND:    100 MPH
PATH LENGTH /STATUTE/:  1.5 MILES
PATH WIDTH  /MAXIMUM/:  50 YARDS
FATALITIES:             NONE
INJURIES:               NONE


START DATE:             JUNE 30 2014
START TIME:             938 PM CDT
START LOCATION:         4.8 MILES WEST OF LISBON
START LAT/LON  :        41.4838/-88.5774

END DATE:               JUNE 30 2014
END TIME:               939 PM CDT
END LOCATION:           4.5 MILES WEST-SOUTHWEST OF LISBON
END LAT/LON:            41.4690/-88.5615

CONCENTRATED DAMAGE WAS FOUND AT TWO FARMSTEADS INCLUDING
DESTRUCTION OF AN OUTBUILDING AND LARGE TREES SNAPPED AT THEIR
BASES. DEBRIS FROM THE OUTBUILDING WAS CARRIED SEVERAL HUNDRED
YARDS. THIS TORNADO BEGAN NEAR U.S. HIGHWAY 52 VERY CLOSE TO
THE LASALLE AND KENDALL COUNTY BORDERS.

IN ADDITION TO THE BRIEF TORNADO…THERE WAS SCATTERED WIND DAMAGE
FROM THE END OF AN EARLIER TORNADO NEAR EARLVILLE THROUGH THE MORRIS
AREA ALL ASSOCIATED WITH THE SAME EMBEDDED STORM. SOME OF THE MOST
INTENSE STRAIGHT LINE WIND DAMAGE WAS CONSISTENT WITH WIND SPEEDS
OF 80 TO 100 MPH.

TIME ESTIMATED PER RADAR.

NOTE:
THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENTS AND PUBLICATION IN
NWS STORM DATA.

Plainfield & Romeoville
…PLAINFIELD AND ROMEOVILLE AREAS IN WILL COUNTY…

.EF-1 TORNADO…

RATING:                 EF-1
ESTIMATED PEAK WIND:    95 MPH
PATH LENGTH /STATUTE/:  3 MILES
PATH WIDTH /MAXIMUM/:   75 YARDS
FATALITIES:             NONE
INJURIES:               NONE

START DATE:             JUNE 30 2014
START TIME:             955 PM CDT
START LOCATION:         1.1 NE PLAINFIELD
START LAT/LON:          41.6272/-88.1846

END DATE:               JUNE 30 2014
END TIME:               958 PM CDT
END LOCATION:           2.4 SW ROMEOVILLE
END LAT/LON:            41.6244/-88.1255

A TORNADO WAS CONFIRMED BASED ON DAMAGE TO MAINLY TREES BUT
ALSO TO SOME RESIDENCES. OVER 50 TREES…INCLUDING MANY LARGE
SOFTWOOD TREES…WERE UPROOTED WITHIN A CONCENTRATED PATH. A
DOZEN MODEST TO LARGE TREES WERE BLOWN TO THE NORTHWEST
AGAINST THE EASTWARD PATH OF THE STORM. NUMEROUS ROADS HAD BEEN
BLOCKED BECAUSE OF FALLEN TREES. IN ADDITION…THERE
WAS MINOR DAMAGE TO NUMEROUS RESIDENCES IN THE WOODLANDS OF THE
RESERVE AND LAKEWOOD FALLS SUBDIVISIONS. THIS DAMAGE WAS MAINLY
SIDING AND SHINGLES PEELED OFF AND WINDOWS BLOWN OUT.

THIS TORNADO CROSSED INTERSTATE 55 NEAR MILE MARKER 261.

THIS TORNADO WAS EMBEDDED WITHIN STRAIGHT-LINE WIND DAMAGE THAT
CONTINUED INTO LOCKPORT AND FURTHER EAST-SOUTHEAST BASED ON
REPORTS.

TIME WAS ESTIMATED PER RADAR.

NOTE:
THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENTS AND PUBLICATION IN
NWS STORM DATA.

Grant Park Area
…TWO EF-1 TORNADOES FOUND IN NORTHEAST KANKAKEE COUNTY…

TWO TORNADOES FROM JUNE 30TH HAVE BEEN CONFIRMED IN NORTHEAST
KANKAKEE COUNTY. ONE OF THESE WAS NORTHWEST OF GRANT PARK WHILE
THE OTHER WAS NORTHEAST OF GRANT PARK. THE LATTER CROSSED THE
INDIANA STATE LINE. MORE DETAILS ON BOTH OF THESE TORNADOES…AS
WELL AS DAMAGE ASSESSMENT RESULTS IN NORTHWEST INDIANA…WILL BE
POSTED WHEN COMPLETED.

THIS BRINGS THE TOTAL NUMBER OF TORNADOES IN NORTH CENTRAL AND
NORTHEAST ILLINOIS ON JUNE 30TH UP TO FIVE. ALL FIVE WERE EF-1
IN INTENSITY ON THE ENHANCED FUJITA SCALE. THESE TORNADOES WERE
WITHIN SCATTERED TO WIDESPREAD SEVERE STRAIGHT-LINE WINDS.

What is a Derecho?
A derecho (pronounced similar to “deh-REY-cho” in English) is a widespread, long-lived wind storm. Derechos are associated with bands of rapidly moving showers or thunderstorms variously known as bow echoes, squall lines, or quasi-linear convective systems.

Although a derecho can produce destruction similar to that of a tornado, the damage typically occurs in one direction along a relatively straight path. As a result, the term “straight-line wind damage” sometimes is used to describe derecho damage. By definition, if the swath of wind damage extends for more than 240 miles (about 400 kilometers), includes wind gusts of at least 58 mph (93 km/h) along most of its length, and several, well-separated 75 mph (121 km/h) or greater gusts, then the event may be classified as a derecho.

SOURCE: National Weather Service Chicago

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