Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 8, NWS Quad Cities, IA

June 9, 2018Buchanan County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jun 9, 2018, 8:50 PM CDT for Buchanan County, Iowa. It was in force for 40 min. 3 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: Jun 9, 2018, 8:50 PM CDT (01:50 UTC)
Expired: Jun 9, 2018, 9:30 PM CDT
In force: 40 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.75 in

County Buchanan County, IA

The radar

The Quad Cities radar (KDVN), 130 km from the middle of the area, began a volume at 01:54 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
Jun 9, 9:02 PM CDT	HAIL 1	1 Ese Independence, IA
Jun 9, 9:20 PM CDT	TSTM WND DMG	2 S Winthrop, IA	ROOF BLOWN OFF OF A HOME. RELAYED BY THE EM. TIME ESTIMATED FROM RADAR.
Jun 9, 9:36 PM CDT	TORNADO	6 Se Winthrop Ia, IA	AN EF-1 TORNADO TOUCHED DOWN SOUTHEAST OF WINTHROP, IA. A HOUSE WAS DAMAGED. GARAGE DOOR FAILED AND ROOF CAME OFF IN THE WIND. SOME TREE DAMAGE WAS ALSO NOTED. THE DURATION OF THE TORNADO EVENT WAS 1 MINUTE.

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

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, 1.8 hours before the alert went out and 134 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.

311 
WFUS53 KDVN 100150
TORDVN
IAC019-100230-
/O.NEW.KDVN.TO.W.0008.180610T0150Z-180610T0230Z/

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

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Southeastern Buchanan County in northeastern Iowa...

* Until 930 PM CDT.
    
* At 849 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Rowley, or near Independence, moving east at 20
  mph.

  HAZARD...Tornado and golf ball 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...
  Winthrop and Quasqueton around 900 PM CDT.

Other locations impacted by this tornadic thunderstorm include Monti
and Buchanan 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 4245 9160 4232 9160 4236 9192 4248 9188
TIME...MOT...LOC 0149Z 280DEG 18KT 4240 9184 

TORNADO...RADAR INDICATED
HAIL...1.75IN

$$

McClure

3 follow-up statements

257 
WWUS53 KDVN 100157
SVSDVN

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

IAC019-100230-
/O.CON.KDVN.TO.W.0008.000000T0000Z-180610T0230Z/
Buchanan IA-
857 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
SOUTHEASTERN BUCHANAN COUNTY...
    
At 857 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Quasqueton, or 7 miles southeast of Independence,
moving east at 20 mph.

HAZARD...Tornado and ping pong ball 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
southeastern Buchanan County, including the following locations...
Monti and Buchanan 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 4245 9160 4232 9160 4236 9192 4248 9188
TIME...MOT...LOC 0157Z 280DEG 18KT 4239 9178 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

McClure

387 
WWUS53 KDVN 100211
SVSDVN

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

IAC019-100230-
/O.CON.KDVN.TO.W.0008.000000T0000Z-180610T0230Z/
Buchanan IA-
911 PM CDT SAT JUN 9 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
SOUTHEASTERN BUCHANAN COUNTY...
    
At 911 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Quasqueton, or 10 miles southeast of Independence,
moving east at 15 mph.

HAZARD...Tornado and ping pong ball 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...
Quasqueton and Monti. 

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 4245 9160 4232 9160 4235 9180 4246 9175
TIME...MOT...LOC 0211Z 275DEG 15KT 4241 9171 

TORNADO...RADAR INDICATED
HAIL...1.50IN

$$

McClure

206 
WWUS53 KDVN 100223
SVSDVN

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

IAC019-100232-
/O.EXP.KDVN.TO.W.0008.000000T0000Z-180610T0230Z/
Buchanan IA-
923 PM CDT SAT JUN 9 2018

...THE TORNADO WARNING FOR SOUTHEASTERN BUCHANAN 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.

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

LAT...LON 4245 9160 4232 9160 4235 9180 4246 9175
TIME...MOT...LOC 0222Z 280DEG 18KT 4240 9165 

$$

McClure

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, 8:25 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, 8:52 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.