Alert archive / Illinois / Tornado Warnings in 2021

Tornado Warning 22, NWS Quad Cities, IA

August 9, 2021Bureau County, Illinois

NWS Quad Cities, IA issued this tornado warning at Aug 9, 2021, 7:30 PM CDT for Bureau County, Illinois. It was in force for 45 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 9, 2021, 7:30 PM CDT (00:30 UTC)
Expired: Aug 9, 2021, 8:15 PM CDT
In force: 45 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County Bureau County, IL

The radar

The Quad Cities radar (KDVN), 105 km from the middle of the area, began a volume at 00:32 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Aug 9, 2:43 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.5 hours before the alert went out and 99 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: 2409 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1156 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

521 
WFUS53 KDVN 100030
TORDVN
ILC011-100115-
/O.NEW.KDVN.TO.W.0022.210810T0030Z-210810T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
730 PM CDT Mon Aug 9 2021

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Central Bureau County in north central Illinois...

* Until 815 PM CDT.

* At 730 PM CDT, a confirmed tornado was located over Wyanet, or near
  Princeton, moving east at 20 mph.

  HAZARD...Damaging tornado.

  SOURCE...Public confirmed tornado.

  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.

* The tornado will be near...
  Princeton and Tiskilwa around 740 PM CDT.

Other locations in the path of this tornadic thunderstorm include
DePue and Bureau Junction.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4131 8931 4130 8934 4128 8934 4123 8936
      4123 8937 4134 8961 4142 8959 4140 8924
TIME...MOT...LOC 0030Z 289DEG 16KT 4136 8954 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

Gibbs

4 follow-up statements

250 
WWUS53 KDVN 100039
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
739 PM CDT Mon Aug 9 2021

ILC011-100115-
/O.CON.KDVN.TO.W.0022.000000T0000Z-210810T0115Z/
Bureau IL-
739 PM CDT Mon Aug 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR CENTRAL
BUREAU COUNTY...
    
At 738 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Princeton, moving east at 15 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.

Locations impacted include...
  DePue and Bureau Junction.

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.

This storm has a history of producing tornadoes.  Seek shelter now!

&&

LAT...LON 4131 8931 4130 8934 4128 8934 4123 8936
      4123 8937 4134 8961 4142 8959 4140 8924
TIME...MOT...LOC 0038Z 289DEG 14KT 4135 8951 

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

$$

Gibbs

187 
WWUS53 KDVN 100052
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
752 PM CDT Mon Aug 9 2021

ILC011-100115-
/O.CON.KDVN.TO.W.0022.000000T0000Z-210810T0115Z/
Bureau IL-
752 PM CDT Mon Aug 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR CENTRAL
BUREAU COUNTY...
    
At 752 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Tiskilwa, or near Princeton, and is nearly
stationary.

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.

Locations impacted include...
  Tiskilwa.

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.

This storm has a history of producing tornadoes.  Seek shelter now!

&&

LAT...LON 4131 8931 4130 8934 4128 8934 4123 8936
      4123 8937 4134 8961 4138 8959 4135 8928
TIME...MOT...LOC 0052Z 005DEG 2KT 4134 8951 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Gibbs

229 
WWUS53 KDVN 100103
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
803 PM CDT Mon Aug 9 2021

ILC011-100115-
/O.CON.KDVN.TO.W.0022.000000T0000Z-210810T0115Z/
Bureau IL-
803 PM CDT Mon Aug 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR CENTRAL
BUREAU COUNTY...
    
At 803 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Tiskilwa, or near Princeton, moving southeast at 10
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.

Locations impacted include...
Princeton and Tiskilwa. 

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.

This storm has a history of producing tornadoes.  Seek shelter now!

&&

LAT...LON 4130 8941 4128 8947 4132 8957 4133 8959
      4137 8956 4134 8942
TIME...MOT...LOC 0103Z 308DEG 9KT 4132 8951 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Gibbs

079 
WWUS53 KDVN 100104
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
804 PM CDT Mon Aug 9 2021

ILC011-100115-
/O.CON.KDVN.TO.W.0022.000000T0000Z-210810T0115Z/
Bureau IL-
804 PM CDT Mon Aug 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR CENTRAL
BUREAU COUNTY...
    
At 804 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Tiskilwa, or near Princeton, moving southeast at 10
mph.

HAZARD...Tornado and quarter size hail.

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.

Locations impacted include...
Princeton and Tiskilwa. 

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.

This storm has a history of producing tornadoes.  Seek shelter now!

&&

LAT...LON 4130 8941 4128 8947 4132 8957 4133 8959
      4137 8956 4134 8942
TIME...MOT...LOC 0104Z 308DEG 9KT 4132 8950 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:12 PM CDT	Tornado Warning Tornado observed	DVN	Bureau	48 min
Aug 9, 8:02 PM CDT	Flash Flood Warning	DVN	Bureau	2 hr
Aug 9, 8:16 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	29 min
Aug 9, 9:39 PM CDT	Special Weather Statement	DVN	Henry	36 min
Aug 9, 9:54 PM CDT	Special Weather Statement	DVN	Henry	51 min
Aug 9, 10:44 PM CDT	Special Weather Statement	DVN	Mercer	31 min
Aug 10, 2:28 PM CDT	Heat Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	29 hr
Aug 10, 4:04 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	56 min
Aug 10, 5:00 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Whiteside	45 min
Aug 10, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	51 min
Aug 10, 5:47 PM CDT	Special Weather Statement	DVN	Bureau	13 min
Aug 10, 5:47 PM CDT	Special Weather Statement	DVN	Bureau	13 min
Aug 10, 5:49 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	41 min
Aug 10, 6:16 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	13 min
Aug 10, 6:50 PM CDT	Severe Thunderstorm Warning	DVN	Bureau	25 min
Aug 10, 6:53 PM CDT	Special Weather Statement	DVN	Mercer, Warren	37 min

Nearby

Tornado Warnings in Illinois, 2021 Every tornado warning in 2021 Tornadoes in 2021

Sources

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