Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 6, NWS Quad Cities, IA

June 9, 2018Benton County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 9, 2018, 8:05 PM CDT for Benton County, Iowa. It was in force for 40 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, 8:05 PM CDT (01:05 UTC)
Expired: Jun 9, 2018, 8:45 PM CDT
In force: 40 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Benton County, IA

The radar

The Quad Cities radar (KDVN), 132 km from the middle of the area, began a volume at 01:04 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, 1.1 hours before the alert went out and 139 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.

792 
WFUS53 KDVN 100105
TORDVN
IAC011-100145-
/O.NEW.KDVN.TO.W.0006.180610T0105Z-180610T0145Z/

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

The National Weather Service in the Quad Cities has issued a

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

* Until 845 PM CDT.
    
* At 804 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Belle Plaine, or 11 miles northwest of Marengo,
  moving east at 30 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...
  Luzerne around 810 PM CDT.
  Blairstown and Van Horne around 820 PM CDT.
  Newhall around 830 PM CDT.
  Norway around 835 PM CDT.
  Atkins and Walford around 845 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Watkins and Hannen Lake Park.

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 4200 9230 4202 9183 4186 9183 4186 9230
TIME...MOT...LOC 0104Z 266DEG 27KT 4190 9224 

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

$$

Gibbs

2 follow-up statements

231 
WWUS53 KDVN 100119
SVSDVN

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

IAC011-100145-
/O.CON.KDVN.TO.W.0006.000000T0000Z-180610T0145Z/
Benton IA-
819 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR SOUTHERN
BENTON COUNTY...
    
At 816 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Luzerne, or 10 miles northwest of Marengo, 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 dangerous storm will be near...
  Keystone and Luzerne around 820 PM CDT.
  Blairstown around 835 PM CDT.
  Van Horne around 840 PM CDT.
  Newhall and Norway around 845 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Watkins and Hannen Lake Park.

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 4200 9230 4202 9183 4186 9183 4186 9230
TIME...MOT...LOC 0116Z 263DEG 17KT 4191 9222 

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

$$

Gibbs

885 
WWUS53 KDVN 100131 RRA
SVSDVN

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

IAC011-100145-
/O.CON.KDVN.TO.W.0006.000000T0000Z-180610T0145Z/
Benton IA-
831 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 845 PM CDT FOR SOUTHERN
BENTON COUNTY...
    
At 831 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Luzerne, or 11 miles north of Marengo, moving east
at 25 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...
  Blairstown around 835 PM CDT.
  Van Horne around 840 PM CDT.
  Newhall around 845 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.

&&

LAT...LON 4200 9230 4202 9183 4192 9183 4190 9230
TIME...MOT...LOC 0131Z 254DEG 21KT 4195 9214 

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

$$

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, 8:25 PM CDT	Tornado Warning	DVN	Benton	65 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.