Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 7, NWS Quad Cities, IA

June 9, 2018Benton County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 9, 2018, 8:25 PM CDT for Benton County, Iowa. It was in force for 65 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 9, 2018, 8:25 PM CDT (01:25 UTC)
Expired: Jun 9, 2018, 9:30 PM CDT
In force: 65 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

County Benton County, IA

The radar

The Quad Cities radar (KDVN), 139 km from the middle of the area, began a volume at 01:26 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
Jun 9, 7:43 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 1.4 hours before the alert went out and 145 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: 1247 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1107 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

683 
WFUS53 KDVN 100125
TORDVN
IAC011-100230-
/O.NEW.KDVN.TO.W.0007.180610T0125Z-180610T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
825 PM CDT SAT JUN 9 2018

The National Weather Service in the Quad Cities has issued a

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

* Until 930 PM CDT.
    
* At 824 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Dysart, or 13 miles northeast of Toledo, moving
  east at 20 mph.

  HAZARD...Tornado and half dollar 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.

* This dangerous storm will be near...
  Garrison around 900 PM CDT.
  Vinton around 920 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Rodgers Park, Vinton Memorial Airport, Hoefle-Dulin Park and Benton
County Fairgrounds.

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 4226 9199 4202 9194 4200 9230 4215 9230
TIME...MOT...LOC 0124Z 251DEG 16KT 4207 9234 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Gibbs

4 follow-up statements

256 
WWUS53 KDVN 100135
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
835 PM CDT SAT JUN 9 2018

IAC011-100230-
/O.CON.KDVN.TO.W.0007.000000T0000Z-180610T0230Z/
Benton IA-
835 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
NORTHWESTERN BENTON COUNTY...
    
At 835 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Keystone, or 15 miles southwest of Vinton, moving
east at 15 mph.

HAZARD...Tornado and half dollar 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.

This dangerous storm will be near...
  Garrison around 905 PM CDT.
  Van Horne around 910 PM CDT.
  Vinton around 920 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Hoefle-Dulin Park and Benton County Fairgrounds.

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 4202 9194 4200 9230 4215 9230 4220 9198
TIME...MOT...LOC 0135Z 264DEG 15KT 4205 9228 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Gibbs

484 
WWUS53 KDVN 100154
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
854 PM CDT SAT JUN 9 2018

IAC011-100230-
/O.CON.KDVN.TO.W.0007.000000T0000Z-180610T0230Z/
Benton IA-
854 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR CENTRAL
BENTON COUNTY...
    
At 854 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Keystone, or 11 miles southwest of Vinton, moving
east at 20 mph.

HAZARD...Tornado and half dollar 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.

This dangerous storm will be near...
  Van Horne around 905 PM CDT.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4200 9225 4212 9225 4215 9197 4202 9194
TIME...MOT...LOC 0154Z 272DEG 16KT 4202 9215 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

Gibbs

057 
WWUS53 KDVN 100211 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
911 PM CDT SAT JUN 9 2018

IAC011-100230-
/O.CON.KDVN.TO.W.0007.000000T0000Z-180610T0230Z/
Benton IA-
911 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR CENTRAL
BENTON COUNTY...
    
At 911 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Newhall, or 8 miles southeast of Vinton, moving east
at 20 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.

This tornadic thunderstorm will remain over mainly rural areas of
central Benton County.

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.

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4201 9209 4208 9209 4215 9197 4202 9194
TIME...MOT...LOC 0211Z 267DEG 19KT 4205 9196 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Gibbs

002 
WWUS53 KDVN 100221
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
921 PM CDT SAT JUN 9 2018

IAC011-100231-
/O.EXP.KDVN.TO.W.0007.000000T0000Z-180610T0230Z/
Benton IA-
921 PM CDT SAT JUN 9 2018

...THE TORNADO WARNING FOR CENTRAL BENTON COUNTY WILL EXPIRE AT 930
PM CDT...
    
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.  However
small hail and gusty winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
east central Iowa.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
the Quad Cities.

Remember, a Severe Thunderstorm Warning still remains in effect for
Benton County until 1030 PM CDT.

LAT...LON 4201 9209 4208 9209 4215 9197 4202 9194
TIME...MOT...LOC 0221Z 251DEG 16KT 4206 9191 

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 7:51 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	54 min
Jun 9, 8:05 PM CDT	Tornado Warning	DVN	Benton	40 min
Jun 9, 8:27 PM CDT	River Flood Watch	DVN	Buchanan, Linn	15 hr
Jun 9, 8:27 PM CDT	River Flood Watch	DVN	Cedar, Jones, Linn	13 hr
Jun 9, 8:27 PM CDT	River Flood Watch	DVN	Clinton, Scott	61 hr
Jun 9, 8:44 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware	61 min
Jun 9, 8:50 PM CDT	Tornado Warning	DVN	Buchanan	40 min
Jun 9, 8:52 PM CDT	River Flood Watch	DVN	Benton, Linn	6 days
Jun 9, 8:52 PM CDT	River Flood Watch	DVN	Cedar, Johnson, Linn	8 days
Jun 9, 8:52 PM CDT	River Flood Watch	DVN	Cedar, Louisa, Muscatine	49 hr
Jun 9, 8:58 PM CDT	Tornado Warning	DVN	Benton, Iowa	32 min
Jun 9, 9:10 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan	50 min
Jun 9, 9:17 PM CDT	Flash Flood Warning	DVN	Buchanan	6 hr
Jun 9, 9:20 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Linn	70 min
Jun 9, 9:44 PM CDT	Severe Thunderstorm Warning	DVN	Iowa	46 min
Jun 9, 9:45 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Jones, Linn	60 min
Jun 9, 10:28 PM CDT	Tornado Warning	DVN	Benton, Iowa	19 min
Jun 9, 10:36 PM CDT	Flash Flood Warning	DVN	Delaware	6 hr
Jun 9, 10:36 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	54 min
Jun 9, 10:42 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Jones, Linn	48 min
Jun 9, 10:56 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Keokuk, Washington	49 min
Jun 9, 11:16 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Jones	44 min
Jun 9, 11:34 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Scott	41 min
Jun 10, 12:17 AM CDT	Severe Thunderstorm Warning	DVN	Clinton	43 min
Jun 10, 12:25 AM CDT	River Flood Warning	DVN	Delaware, Jones	59 hr
Jun 10, 9:55 AM CDT	Special Weather Statement	DVN	Cedar, Johnson, Muscatine	50 min
Jun 10, 10:39 AM CDT	Special Weather Statement	DVN	Louisa, Muscatine, Scott	51 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.