Alert archive / Illinois / Tornado Warnings in 2020

Tornado Warning 33, NWS Quad Cities, IA

November 10, 2020Henderson County, Mercer County, Warren County, Illinois

NWS Quad Cities, IA issued this tornado warning at Nov 10, 2020, 1:57 PM CST for Henderson County, Mercer County, Warren County, Illinois. It was in force for 15 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Nov 10, 2020, 1:57 PM CST (19:57 UTC)
Expired: Nov 10, 2020, 2:12 PM CST
In force: 15 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Henderson County, IL, Mercer County, IL, Warren County, IL

The radar

The Quad Cities radar (KDVN), 67 km from the middle of the area, began a volume at 19:59 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Nov 10, 2:03 PM CST	TORNADO	2 Wsw Burgess, IL	BRIEF TORNADO WITH 100 MPH PEAK WINDS AND A 30 YARD PATH WIDTH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Nov 10, 11:22 AM CST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.0 hours before the alert went out and 69 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 97 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 614 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

386 
WFUS53 KDVN 101957
TORDVN
ILC071-131-187-102030-
/O.NEW.KDVN.TO.W.0033.201110T1957Z-201110T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
157 PM CST Tue Nov 10 2020

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northeastern Henderson County in west central Illinois...
  Northwestern Warren County in west central Illinois...
  South central Mercer County in northwestern Illinois...

* Until 230 PM CST.
    
* At 155 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Seaton, or 9 miles northeast of Oquawka, moving
  northeast at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  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.

* This dangerous storm will be near...
  Seaton around 200 PM CST.
  Burgess around 210 PM CST.

Other locations impacted by this tornadic thunderstorm include
Eleanor, Bald Bluff, Sunbeam, Big River State Forest and Alexis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4091 9083 4106 9094 4119 9071 4107 9050
TIME...MOT...LOC 1955Z 210DEG 40KT 4104 9082 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

McClure

3 follow-up statements

070 
WWUS53 KDVN 102002
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
202 PM CST Tue Nov 10 2020

ILC071-131-187-102030-
/O.CON.KDVN.TO.W.0033.000000T0000Z-201110T2030Z/
Henderson IL-Warren IL-Mercer IL-
202 PM CST Tue Nov 10 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CST FOR
NORTHEASTERN HENDERSON...NORTHWESTERN WARREN AND SOUTH CENTRAL MERCER
COUNTIES...
    
At 202 PM CST, a severe thunderstorm capable of producing a tornado
was located near Seaton, or near Aledo, moving northeast at 45 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

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.

This dangerous storm will be near...
  Burgess around 210 PM CST.

Other locations impacted by this tornadic thunderstorm include
Eleanor, Alexis and Sunbeam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4096 9073 4110 9087 4119 9071 4107 9050
TIME...MOT...LOC 2002Z 213DEG 41KT 4110 9072 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

McClure

882 
WWUS53 KDVN 102009
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
209 PM CST Tue Nov 10 2020

ILC071-102019-
/O.CAN.KDVN.TO.W.0033.000000T0000Z-201110T2030Z/
Henderson IL-
209 PM CST Tue Nov 10 2020

...THE TORNADO WARNING FOR NORTHEASTERN HENDERSON COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has weakened. 
moved out of the warned area. Therefore, the warning has been 
cancelled.

A Severe Thunderstorm Watch remains in effect until 600 PM CST for
northwestern and west central Illinois.

LAT...LON 4099 9067 4110 9073 4114 9062 4107 9050
TIME...MOT...LOC 2009Z 237DEG 45KT 4109 9056 

$$

ILC131-187-102030-
/O.CON.KDVN.TO.W.0033.000000T0000Z-201110T2030Z/
Warren IL-Mercer IL-
209 PM CST Tue Nov 10 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CST FOR NORTH
CENTRAL WARREN AND SOUTH CENTRAL MERCER COUNTIES...
    
At 209 PM CST, a severe thunderstorm capable of producing a tornado
was located near North Henderson, or 12 miles southeast of Aledo,
moving northeast at 50 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

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.

This tornadic thunderstorm will remain over mainly rural areas of
north central Warren and south central Mercer Counties, including the
following locations... Alexis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4099 9067 4110 9073 4114 9062 4107 9050
TIME...MOT...LOC 2009Z 237DEG 45KT 4109 9056 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

McClure

898 
WWUS53 KDVN 102012
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
212 PM CST Tue Nov 10 2020

ILC131-187-102022-
/O.CAN.KDVN.TO.W.0033.000000T0000Z-201110T2030Z/
Warren IL-Mercer IL-
212 PM CST Tue Nov 10 2020

...THE TORNADO WARNING FOR NORTH CENTRAL WARREN AND SOUTH CENTRAL
MERCER COUNTIES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been
cancelled. However, large hail and damaging winds remain likely and a
Severe Thunderstorm Warning remains in effect for the area.

A Severe Thunderstorm Watch remains in effect until 600 PM CST for
northwestern and west central Illinois.

LAT...LON 4099 9067 4110 9073 4114 9062 4107 9050
TIME...MOT...LOC 2010Z 210DEG 40KT 4112 9053 

$$

McClure

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 10, 2:41 AM CST	Wind Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	17 hr
Nov 10, 12:45 PM CST	Severe Thunderstorm Warning	DVN	Hancock	45 min
Nov 10, 1:28 PM CST	Severe Thunderstorm Warning	DVN	Henderson, Mercer, Warren	47 min
Nov 10, 1:29 PM CST	Severe Thunderstorm Warning	DVN	Hancock, McDonough	46 min
Nov 10, 1:49 PM CST	Tornado Warning	DVN	Mercer, Rock Island	26 min
Nov 10, 2:07 PM CST	Severe Thunderstorm Warning	DVN	Henry, Rock Island, Whiteside	38 min
Nov 10, 2:11 PM CST	Severe Thunderstorm Warning	DVN	Henry, McDonough, Mercer, Warren	34 min
Nov 10, 2:23 PM CST	Tornado Warning	DVN	Henry, Rock Island, Whiteside	17 min
Nov 10, 2:38 PM CST	Severe Thunderstorm Warning	DVN	Carroll, Whiteside	52 min
Nov 10, 2:40 PM CST	Severe Thunderstorm Warning	DVN	Bureau, Henry	50 min
Nov 10, 2:54 PM CST	Tornado Warning	DVN	Carroll, Whiteside	19 min
Nov 10, 3:19 PM CST	Severe Thunderstorm Warning	DVN	Stephenson	24 min
Nov 10, 3:21 PM CST	Severe Thunderstorm Warning	DVN	Bureau, Putnam	39 min
Nov 10, 3:37 PM CST	Tornado Warning	DVN	Bureau, Putnam	20 min
Nov 10, 3:57 PM CST	Severe Thunderstorm Warning	DVN	Bureau, Putnam	18 min

Nearby

Tornado Warnings in Illinois, 2020 Every tornado warning in 2020 Tornadoes in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.