Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 31, NWS Quad Cities, IA

September 25, 2018Henry County, Louisa County, Washington County, Iowa

NWS Quad Cities, IA issued this tornado warning at Sep 25, 2018, 1:19 PM CDT for Henry County, Louisa County, Washington County, Iowa. It was in force for 41 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: Sep 25, 2018, 1:19 PM CDT (18:19 UTC)
Expired: Sep 25, 2018, 2:00 PM CDT
In force: 41 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Henry County, IA, Louisa County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 85 km from the middle of the area, began a volume at 18:22 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
Sep 25, 1:26 PM CDT	TORNADO	3 Wnw Winfield, IA	STRONGER EF0 TORNADO TOUCHED DOWN NORTHWEST OF WINFIELD IA. DAMAGE TO TREES AND CORN WERE NOTED ALONG ITS LITTLE OVER A QUARTER OF MILE PATH. THE MAX WIDTH WAS ESTIMATED TO BE 20 YARDS. THE STRONGEST WINDS WERE ESTIMATED TO BE 85 MPH.
Sep 25, 1:59 PM CDT	TSTM WND DMG	3 Sse Noble, IA	LARGE TREE LIMB DOWN. NOTED FROM SURVEY.

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 12:00Z, 6.3 hours before the alert went out and 91 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: 47 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 703 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

381 
WFUS53 KDVN 251819
TORDVN
IAC087-115-183-251900-
/O.NEW.KDVN.TO.W.0031.180925T1819Z-180925T1900Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
119 PM CDT TUE SEP 25 2018

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northeastern Henry County in southeastern Iowa...
  Southwestern Louisa County in southeastern Iowa...
  Southeastern Washington County in southeastern Iowa...

* Until 200 PM CDT.
    
* At 119 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Olds, or 11 miles north of Mount Pleasant, moving
  northeast at 20 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...
  Crawfordsville around 135 PM CDT.
  Winfield and Wyman around 140 PM CDT.
  Columbus Junction and Columbus City around 200 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Swedesburg, Noble, Cairo, Virginia Grove Recreation Area, Louisa
County Fairgrounds and Fredonia.

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 4131 9137 4113 9119 4108 9157 4116 9166
TIME...MOT...LOC 1819Z 243DEG 16KT 4113 9157 

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

$$

Gibbs

5 follow-up statements

996 
WWUS53 KDVN 251826
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
126 PM CDT TUE SEP 25 2018

IAC087-115-183-251900-
/O.CON.KDVN.TO.W.0031.000000T0000Z-180925T1900Z/
Henry IA-Louisa IA-Washington IA-
126 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM CDT FOR
NORTHEASTERN HENRY...SOUTHWESTERN LOUISA AND SOUTHEASTERN WASHINGTON
COUNTIES...
    
At 126 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Winfield, or 10 miles southwest of Columbus
Junction, moving east at 25 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...
  Winfield around 130 PM CDT.
  Columbus City around 145 PM CDT.
  Columbus Junction around 150 PM CDT.

Other locations impacted by this tornadic thunderstorm include Cairo,
Virginia Grove Recreation Area, Louisa County Fairgrounds and
Fredonia.

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 4131 9137 4113 9119 4110 9157 4118 9162
TIME...MOT...LOC 1826Z 248DEG 21KT 4115 9148 

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

$$

Gibbs

731 
WWUS53 KDVN 251831
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
131 PM CDT TUE SEP 25 2018

IAC087-183-251840-
/O.CAN.KDVN.TO.W.0031.000000T0000Z-180925T1900Z/
Henry IA-Washington IA-
131 PM CDT TUE SEP 25 2018

...THE TORNADO WARNING FOR NORTHEASTERN HENRY AND SOUTHEASTERN
WASHINGTON COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 4131 9137 4113 9119 4112 9137 4116 9137
      4116 9148 4121 9149
TIME...MOT...LOC 1830Z 238DEG 16KT 4117 9146 

$$

IAC115-251900-
/O.CON.KDVN.TO.W.0031.000000T0000Z-180925T1900Z/
Louisa IA-
131 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM CDT FOR
SOUTHWESTERN LOUISA COUNTY...
    
At 130 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Wyman, or 9 miles southwest of Columbus Junction,
moving northeast at 20 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...
  Columbus Junction and Columbus City around 155 PM CDT.

Other locations impacted by this tornadic thunderstorm include Cairo,
Virginia Grove Recreation Area, Louisa County Fairgrounds and
Fredonia.

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 4131 9137 4113 9119 4112 9137 4116 9137
      4116 9148 4121 9149
TIME...MOT...LOC 1830Z 238DEG 16KT 4117 9146 

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

$$

RP Kinney

194 
WWUS53 KDVN 251840
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
140 PM CDT TUE SEP 25 2018

IAC115-251900-
/O.CON.KDVN.TO.W.0031.000000T0000Z-180925T1900Z/
Louisa IA-
140 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM CDT FOR WEST
CENTRAL LOUISA COUNTY...
    
At 140 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Wyman, or near Columbus Junction, moving northeast
at 20 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...
  Columbus Junction and Columbus City around 150 PM CDT.

Other locations impacted by this tornadic thunderstorm include Cairo.

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 4128 9135 4119 9125 4116 9137 4117 9142
      4121 9144
TIME...MOT...LOC 1840Z 245DEG 19KT 4119 9139 

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

$$

RP Kinney

353 
WWUS53 KDVN 251845
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
145 PM CDT TUE SEP 25 2018

IAC115-251900-
/O.CON.KDVN.TO.W.0031.000000T0000Z-180925T1900Z/
Louisa IA-
145 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 200 PM CDT FOR WEST
CENTRAL LOUISA COUNTY...
        
At 145 PM CDT, a confirmed tornado was located near Columbus City, or
near Columbus Junction, moving northeast at 20 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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
west central Louisa County, including the following locations...
Cairo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4120 9126 4117 9137 4121 9142 4128 9135
TIME...MOT...LOC 1845Z 235DEG 19KT 4122 9135 

TORNADO...OBSERVED
HAIL...<.75IN

$$

RP Kinney

988 
WWUS53 KDVN 251857
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
157 PM CDT TUE SEP 25 2018

IAC115-251906-
/O.EXP.KDVN.TO.W.0031.000000T0000Z-180925T1900Z/
Louisa IA-
157 PM CDT TUE SEP 25 2018

...THE TORNADO WARNING FOR WEST CENTRAL LOUISA COUNTY WILL EXPIRE AT
200 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southeastern Iowa.

Remember, a Tornado Warning still remains in effect for northern 
Louisa and southern Muscatine counties until 230 pm.

LAT...LON 4120 9126 4117 9137 4121 9142 4128 9135
TIME...MOT...LOC 1856Z 243DEG 16KT 4124 9130 

$$

RP Kinney

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 25, 12:48 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Johnson, Linn	42 min
Sep 25, 1:17 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Keokuk, Washington	43 min
Sep 25, 1:28 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Jackson, Johnson, Jones, Linn and 1 more	62 min
Sep 25, 1:28 PM CDT	Tornado Warning	DVN	Jones, Linn	47 min
Sep 25, 1:49 PM CDT	Tornado Warning	DVN	Louisa, Muscatine	41 min
Sep 25, 1:51 PM CDT	Tornado Warning	DVN	Cedar, Jones	24 min
Sep 25, 2:12 PM CDT	Tornado Warning	DVN	Henry, Louisa, Washington	27 min
Sep 25, 2:27 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Muscatine, Scott	63 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.