Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 1, NWS Quad Cities, IA

March 23, 2021Des Moines County, Lee County, Iowa; Hancock County, Illinois

NWS Quad Cities, IA issued this tornado warning at Mar 23, 2021, 7:11 PM CDT for Des Moines County, Lee County, Iowa; Hancock County, Illinois. It was in force for 19 min. 2 reports 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: Mar 23, 2021, 7:11 PM CDT (00:11 UTC)
Expired: Mar 23, 2021, 7:30 PM CDT
In force: 19 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Des Moines County, IA, Lee County, IA, Hancock County, IL

The radar

The Quad Cities radar (KDVN), 112 km from the middle of the area, began a volume at 00:12 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
Mar 23, 7:19 PM CDT	TORNADO	1 Nw Fort Madison Munic, IA	A BRIEF TORNADO CAUSED ROOF/TREE DAMAGE AND DESTROYED A SHED AT A RESIDENCE NORTH OF TOWN. THE LEE COUNTY EM AND SHERIFF DEPT. ASSISTED WITH THIS SURVEY.
Mar 23, 7:20 PM CDT	TSTM WND DMG	1 Nw Fort Madison Munic, IA	APPROXIMATE TIME, EMERGENCY MANAGER REPORTED THAT A ROOF WAS BLOWN OFF OF A HOME WITH SHEDS BLOWN OVER WITH DEBRIS IN TREES. A SPOTTER ALSO REPORTED A WELL DEFINED WALL CLOUD VISIBLE FROM DENMARK, IA LOOKING TOWARDS WHERE THE DAMAGE OCCURRED. PROBABLE TORNADO.

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

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.2 hours before the alert went out and 117 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: 24 J/kg
Mixed-layer CIN: -24 J/kg
Mixed-layer LCL: 518 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

467 
WFUS53 KDVN 240011
TORDVN
ILC067-IAC057-111-240045-
/O.NEW.KDVN.TO.W.0001.210324T0011Z-210324T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
711 PM CDT Tue Mar 23 2021

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northwestern Hancock County in west central Illinois...
  Southwestern Des Moines County in southeastern Iowa...
  Northeastern Lee County in southeastern Iowa...

* Until 745 PM CDT.
    
* At 711 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Fort Madison, moving northeast at 35 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...
  Niota around 715 PM CDT.
  Denmark around 730 PM CDT.
  Iowa Army Ammunition Plant around 735 PM CDT.
  Danville and Middletown around 740 PM CDT.
  Burlington and West Burlington around 745 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Augusta, Beaverdale, Des Moines County Fairgrounds, Welter Recreation
Area, Spring Grove, Camp L-Kee-Ta, Sawyer, Wever, Burlington Regional
Airport and Fort Madison Municipal Arpt.

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 4058 9145 4081 9138 4081 9137 4085 9137
      4090 9136 4082 9109 4081 9110 4079 9109
      4077 9109 4054 9136
TIME...MOT...LOC 0011Z 202DEG 30KT 4060 9137 

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

$$

Gibbs

4 follow-up statements

149 
WWUS53 KDVN 240017
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
717 PM CDT Tue Mar 23 2021

ILC067-IAC057-111-240045-
/O.CON.KDVN.TO.W.0001.000000T0000Z-210324T0045Z/
Hancock IL-Des Moines IA-Lee IA-
717 PM CDT Tue Mar 23 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR NORTH
CENTRAL HANCOCK...SOUTHWESTERN DES MOINES AND NORTHEASTERN LEE
COUNTIES...
    
At 717 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Fort Madison, moving north at 35 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...
  Denmark around 725 PM CDT.
  Iowa Army Ammunition Plant around 735 PM CDT.
  West Burlington, Danville and Middletown around 740 PM CDT.
  Burlington around 745 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Augusta, Beaverdale, Des Moines County Fairgrounds, Welter Recreation
Area, Spring Grove, Camp L-Kee-Ta, Sawyer, Wever, Burlington Regional
Airport and Fort Madison Municipal Arpt.

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4064 9143 4081 9138 4081 9137 4085 9137
      4090 9136 4082 9109 4081 9110 4079 9109
      4077 9109 4059 9130
TIME...MOT...LOC 0017Z 201DEG 30KT 4066 9134 

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

$$

Gibbs

119 
WWUS53 KDVN 240022
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
722 PM CDT Tue Mar 23 2021

ILC067-240031-
/O.CAN.KDVN.TO.W.0001.000000T0000Z-210324T0045Z/
Hancock IL-
722 PM CDT Tue Mar 23 2021

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

LAT...LON 4063 9140 4081 9138 4081 9137 4085 9137
      4090 9136 4082 9109 4081 9110 4079 9109
      4077 9110 4064 9125 4064 9126 4063 9131
      4061 9135
TIME...MOT...LOC 0021Z 202DEG 30KT 4070 9132 

$$

IAC057-111-240045-
/O.CON.KDVN.TO.W.0001.000000T0000Z-210324T0045Z/
Des Moines IA-Lee IA-
722 PM CDT Tue Mar 23 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHWESTERN DES MOINES AND NORTHEASTERN LEE COUNTIES...
    
At 721 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Denmark, or near Fort Madison, moving north at 35
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...
  Denmark around 725 PM CDT.
  Iowa Army Ammunition Plant around 735 PM CDT.
  West Burlington, Danville and Middletown around 740 PM CDT.
  Burlington around 745 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Augusta, Beaverdale, Des Moines County Fairgrounds, Welter Recreation
Area, Spring Grove, Camp L-Kee-Ta, Sawyer, Wever, Burlington Regional
Airport and Fort Madison Municipal Arpt.

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4063 9140 4081 9138 4081 9137 4085 9137
      4090 9136 4082 9109 4081 9110 4079 9109
      4077 9110 4064 9125 4064 9126 4063 9131
      4061 9135
TIME...MOT...LOC 0021Z 202DEG 30KT 4070 9132 

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

$$

Gibbs

960 
WWUS53 KDVN 240028
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
728 PM CDT Tue Mar 23 2021

IAC057-111-240045-
/O.CON.KDVN.TO.W.0001.000000T0000Z-210324T0045Z/
Des Moines IA-Lee IA-
728 PM CDT Tue Mar 23 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
SOUTHWESTERN DES MOINES AND NORTHEASTERN LEE COUNTIES...
    
At 727 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Denmark, or 9 miles southwest of Burlington, moving
north at 35 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...
  Middletown around 735 PM CDT.
  West Burlington and Danville around 740 PM CDT.
  Burlington around 745 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Augusta, Beaverdale, Des Moines County Fairgrounds, Welter Recreation
Area, Spring Grove, Camp L-Kee-Ta, Wever and Burlington Regional
Airport.

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.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 4073 9138 4081 9138 4081 9137 4085 9137
      4090 9136 4082 9109 4081 9110 4079 9109
      4077 9110 4069 9125
TIME...MOT...LOC 0027Z 202DEG 30KT 4075 9129 

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

$$

Gibbs

247 
WWUS53 KDVN 240030
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
730 PM CDT Tue Mar 23 2021

IAC057-111-240039-
/O.CAN.KDVN.TO.W.0001.000000T0000Z-210324T0045Z/
Des Moines IA-Lee IA-
730 PM CDT Tue Mar 23 2021

...THE TORNADO WARNING FOR SOUTHWESTERN DES MOINES AND NORTHEASTERN
LEE COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.

LAT...LON 4073 9138 4081 9138 4081 9137 4085 9137
      4090 9136 4082 9109 4081 9110 4079 9109
      4077 9110 4069 9125
TIME...MOT...LOC 0029Z 202DEG 30KT 4077 9128 

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 23, 7:40 PM CDT	Tornado Warning	DVN	Washington	15 min

Nearby

Tornado Warnings in Iowa, 2021 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.