LAST UPDATE: 9 AM FRIDAY, AUG. 14
Derecho Brings 15 Confirmed Tornadoes, 100 MPH Winds, Widespread Damage
As the storms approached Kane County, Sheriff Ron Hain sent out staff members as weather spotters at various locations along the west county line and a few locations along IL Route 47. One of the spotters was assigned to I-88 and Dauberman and took this picture showing a very short/weak tornado in a farm field. This tornado did not do any damage. After the storms exited the county we responded to a total of 17 incidents (down trees and down trees/wires). 12 of which supported sheriff’s patrol and five to assist municipalities. The Sheriff’s Office did not receive any reports of damage except the down trees and wires in the county.
A well-organized and long-lived complex of storms produced widespread severe wind damage across Iowa, northern Illinois, and northern Indiana during the day on Monday, Aug. 10. Much of this severe wind was significant (75+ mph winds) resulting in many downed trees, several topped over semi trucks, and many communities had at least some minor structural damage.
Within the broader area of severe winds, there have also been 15 tornadoes confirmed across northern Illinois and northwest Indiana.
Several tornadic circulations developed within the main line of thunderstorms, producing 13 tornadoes across northern Illinois and northwest Indiana. In addition, a lone supercell that was subsequently absorbed into the main line produced two tornadoes in and around the Rockford area, bringing the total number of tornadoes for this event to 15.
As it stands at this time, this is the 5th highest number of tornadoes to occur on a single calendar day in NWS Chicago`s area of responsibility, and the most to occur on a single calendar day in the month of August since 1950.
Chicago, Rogers Park neighborhood, courtesy of Paul Navarro. CREDIT: NWS Chicago website
Preliminary numbers from Aug.10 as of 5 p.m. Aug. 13:
- More than 700 reports of severe wind speeds (58+ mph) or wind damage from the Nebraska/Iowa border, across Iowa, northern Illinois and northern Indiana.
- More than 150 of the wind reports are from northern Illinois and northwest Indiana in the NWS Chicago County Warning Area (CWA).
- In the NWS Chicago County Warning Area, 15 tornadoes have been confirmed, which includes portions of northern Illinois and northwest Indiana.
- The tornadoes include an EF1 tornado in Rogers Park, Illinois (a north-side neighborhood of Chicago), that moved out over Lake Michigan making it a waterspout. This was the first tornado in the city of Chicago since September 3, 2018 (EF0). This was the first F1/EF1+ tornado in the city of Chicago since May 29, 1983 (F1) just east of Cicero Avenue near Hawthorne Race Course. The last time a stronger tornado in the city was an F2 on March 12, 1976 that clipped the far northwest side of the city, roughly near O’Hare Airport and Edison Park.
- Six injuries have been reported in the NWS Chicago CWA, five being in Forreston, IL and one in Peru, IL.
This complex of storms was known as a derecho.
- A derecho produces a swath of particularly damaging thunderstorm winds over an area at least 400 miles long and 60 miles wide.
- These are primarily classified as straight-line winds rather than tornadic.
- Even so, wind speeds in a derecho can exceed 100 mph which is equivalent to that of an EF1 tornado but over a vastly larger area than a tornado would impact.
- Tornadoes can also be embedded within derechos and produce concentrated areas of even more intense damage.
- Derechos develop in an environment with very warm and moist air at the surface, colder air aloft, and moderate to strong winds at upper levels of the atmosphere.
- Northern Illinois and northern Indiana have long been known as a corridor of enhanced derecho activity, as shown in this graphic from a published paper by Guastini & Bosart (2016) titled “Analysis of a Progressive Derecho Climatology and Associated Formation Environments”.
15 Confirmed Tornadoes
Few Serious Injuries
Despite the massive coverage and impressive intensity of the wind damage, there were a very limited number of serious injuries.
“This speaks to the effort of our partners including fellow meteorologists in the weather enterprise effectively communicating the threats and action needed to be taken, as well as emergency management and law enforcement for their preparedness efforts beforehand and assistance efforts immediately after,” the NWS Chicago said.
“Of course it also means that many public citizens heeded the threat and the warnings, as well as communicated them to their family and friends (being a ‘Force of Nature!’).”
For more on severe weather preparedness, see here.
5PM MONDAY
Tornado Warning Over, But High Wind Advisory Until 7 PM
The Tornado Warning is over but a High Wind Warning remains in effect through 7 p.m.in Kane County.
High winds ripped through the county while the Tornado Warning was in effect from shortly after 3 p.m. to about 3:45 p.m. Monday.
This article will be updated with additional data about storm damage when it becomes available.
The National Weather Service in Chicago has issued a High Wind Warning, which includes the following:
- WINDS: Gusting to 55 to 65 mph.
- IMPACTS: These strong winds after recent heavy rainfall may down trees and powerlines, in addition to making travel in high profile vehicles hazardous.
- PRECAUTIONARY/PREPAREDNESS ACTIONS: A High Wind Warning means a hazardous high wind event is expected or occurring. Sustained wind speeds of at least 40 mph or gusts of 58 mph or more can lead to property damage.
3:18PM MONDAY UPDATE
Tornado Warning
The National Weather Service in Chicago has issued a Tornado Warning for Kane County in northeastern Illinois until 3:45 p.m
At 3:10 p.m. a severe thunderstorms capable of producing tornadoes were located along a line extending from Maple Park to near Hinckley to near Sandwich to Lake Holiday to near Sheridan, moving east at 60 mph.
IMPACT: Flying debris will be dangerous to those caught without shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree damage is likely.
These dangerous storms will be near:
- Plano and Lily Lake around 315 PM CDT.
- Yorkville, Campton Hills, Sugar Grove and Elburn around 320 PM CDT.
- Aurora, St. Charles, Oswego, Geneva, Montgomery, North Aurora,
- Boulder Hill and Valley View around 325 PM CDT.
- Bartlett, West Chicago, Batavia, Minooka and Wayne around 330 PM
CDT.
This includes Sandwich Fairgrounds, Aurora University, Fermilab, IL Math and Science Academy, Kane County Cougars Ballpark, and Waubonsee Community College.
2:50PM MONDAY, AUG. 10
The National Weather Service Chicago has issued a Severe Thunderstorm Watch for Kane County and the surrounding area.
xThunderstorms across the central Great Plains may evolve into a quick-moving line of strong to severe thunderstorms today, crossing northern Illinois and northwest Indiana during the mid to late afternoon hours.
If this line develops, damaging wind gusts to 70 mph will be possible.
Additionally, the line of storms will exhibit a quick forward motion of 40 mph to 50 mph.
Make sure to monitor forecast updates throughout the day. Warm and humid conditions with heat index values near 100 degrees are expected late this morning into this afternoon prior to the potential thunderstorms.
Dangerous Storms Approaching
This is a 2008 image of a derecho-type storm in Hampshire, IL.
Widespread damaging thunderstorms with downed trees and power lines are likely this afternoon and evening (Monday, Aug. 10,2020).
The worst may come through the Chicago metro around rush hour.
“We are in rare a category 4/5 severe weather threat for what will likely be a derecho,” the NWS said.
A derecho is a widespread, long-lived wind storm that is associated with a band of rapidly moving showers or thunderstorms. As a result, the term “straight-line wind damage” sometimes is used to describe derecho damage.
Threats include “half-dollar-size hail” and “a tornado or two,” according to the NWS graphics.
Get Warnings
The NWS suggests you have multiple ways to get warnings.
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August 14, 2020 at 09:37PM
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3rd Storm Update: 15 Tornadoes, 700 Reports of Severe Wind Speeds - kanecountyconnects.com
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