Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 12, NWS Quad Cities, IA

June 20, 2018Scott County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 20, 2018, 5:25 PM CDT for Scott County, Iowa. It was in force for 29 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: Jun 20, 2018, 5:25 PM CDT (22:25 UTC)
Expired: Jun 20, 2018, 5:54 PM CDT
In force: 29 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Scott County, IA

The radar

The Quad Cities radar (KDVN), 2 km from the middle of the area, began a volume at 22:24 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 nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.4 hours before the alert went out and 9 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: 235 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

636 
WFUS53 KDVN 202225
TORDVN
IAC163-202315-
/O.NEW.KDVN.TO.W.0012.180620T2225Z-180620T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
525 PM CDT WED JUN 20 2018

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Central Scott County in east central Iowa...

* Until 615 PM CDT.
    
* At 525 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Davenport, moving northeast 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.

* This dangerous storm will be near...
  Davenport around 550 PM CDT.
  Donahue around 555 PM CDT.
  Eldridge around 600 PM CDT.
  Bettendorf around 605 PM CDT.
  Long Grove around 610 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Mississippi Valley Fairgrounds, Davenport Municipal Airport, Park
View and West Lake Park.

This includes the following highways...
 Interstate 74 in Iowa between mile markers 1 and 2.
 Interstate 80 in Iowa between mile markers 287 and 301.
 Interstate 280 between mile markers 1 and 7.

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 4163 9039 4149 9067 4156 9079 4157 9078
      4175 9062
TIME...MOT...LOC 2225Z 222DEG 12KT 4157 9066 

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

$$

Gibbs

4 follow-up statements

439 
WWUS53 KDVN 202231
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
531 PM CDT WED JUN 20 2018

IAC163-202315-
/O.CON.KDVN.TO.W.0012.000000T0000Z-180620T2315Z/
Scott IA-
531 PM CDT WED JUN 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR CENTRAL
SCOTT COUNTY...
    
At 531 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Davenport, moving northeast 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.

This dangerous storm will be near...
  Donahue around 555 PM CDT.
  Eldridge around 600 PM CDT.
  Bettendorf around 610 PM CDT.
  Long Grove around 615 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Mississippi Valley Fairgrounds, Davenport Municipal Airport and Park
View.

This includes the following highways...
 Interstate 74 in Iowa between mile markers 1 and 2.
 Interstate 80 in Iowa between mile markers 287 and 301.
 Interstate 280 between mile markers 1 and 4.

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 4151 9062 4159 9076 4175 9062 4163 9039
TIME...MOT...LOC 2231Z 223DEG 11KT 4158 9065 

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

$$

Gibbs

879 
WWUS53 KDVN 202234
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
534 PM CDT WED JUN 20 2018

IAC163-202315-
/O.CON.KDVN.TO.W.0012.000000T0000Z-180620T2315Z/
Scott IA-
534 PM CDT WED JUN 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR CENTRAL
SCOTT COUNTY...
    
At 534 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Davenport, moving northeast 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.

This dangerous storm will be near...
  Eldridge around 600 PM CDT.
  Long Grove around 610 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Mississippi Valley Fairgrounds, Davenport Municipal Airport and Park
View.

This includes the following highways...
 Interstate 80 in Iowa between mile markers 288 and 296.
 Interstate 280 between mile markers 1 and 3.

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 4153 9062 4159 9074 4175 9062 4167 9048
TIME...MOT...LOC 2234Z 212DEG 11KT 4160 9064 

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

$$

Gibbs

963 
WWUS53 KDVN 202241
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
541 PM CDT WED JUN 20 2018

IAC163-202315-
/O.CON.KDVN.TO.W.0012.000000T0000Z-180620T2315Z/
Scott IA-
541 PM CDT WED JUN 20 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CDT FOR CENTRAL
SCOTT COUNTY...
    
At 541 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Eldridge, or near Davenport, moving northeast 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.

This dangerous storm will be near...
  Eldridge around 600 PM CDT.
  Long Grove around 610 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Davenport Municipal Airport and Park View.

This includes Interstate 80 in Iowa between mile markers 292 and 296.
 
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 4157 9058 4163 9071 4175 9062 4167 9048
TIME...MOT...LOC 2241Z 212DEG 11KT 4162 9063 

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

$$

Gibbs

989 
WWUS53 KDVN 202254
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
554 PM CDT WED JUN 20 2018

IAC163-202304-
/O.CAN.KDVN.TO.W.0012.000000T0000Z-180620T2315Z/
Scott IA-
554 PM CDT WED JUN 20 2018

...THE TORNADO WARNING FOR CENTRAL SCOTT COUNTY 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.  However small hail, gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 4157 9058 4163 9071 4175 9062 4167 9048
TIME...MOT...LOC 2253Z 222DEG 12KT 4165 9059 

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 8:27 PM CDT	Special Weather Statement	DVN	Benton	63 min
Jun 20, 6:36 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Cedar, Iowa, Jefferson, Johnson and 4 more	24 min
Jun 20, 10:09 AM CDT	River Flood Watch	DVN	Iowa, Johnson	34 hr
Jun 20, 2:14 PM CDT	Special Weather Statement	DVN	Henry, Iowa, Jefferson, Keokuk, Lee, Van Buren and 1 more	61 min
Jun 20, 2:29 PM CDT	Tornado Warning	DVN	Keokuk	31 min
Jun 20, 3:10 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Keokuk, Louisa, Washington	65 min
Jun 20, 3:29 PM CDT	Special Weather Statement	DVN	Benton	31 min
Jun 20, 4:33 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones, Linn	42 min
Jun 20, 4:35 PM CDT	Special Weather Statement	DVN	Muscatine	55 min
Jun 20, 4:49 PM CDT	Special Weather Statement	DVN	Clinton, Scott	56 min
Jun 20, 5:39 PM CDT	Flash Flood Warning	DVN	Scott	3 hr
Jun 20, 6:21 PM CDT	Special Weather Statement	DVN	Jefferson, Van Buren	54 min

Nearby

Tornado Warnings in Iowa, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.