Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 35, 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, 2:12 PM CDT for Henry County, Louisa County, Washington County, Iowa. It was in force for 27 min. 1 report 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, 2:12 PM CDT (19:12 UTC)
Expired: Sep 25, 2018, 2:39 PM CDT
In force: 27 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), 84 km from the middle of the area, began a volume at 19:12 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, 2:14 PM CDT	TORNADO	2 Nnw Winfield, IA	EF1 TORNADO TRAVELED A LITTLE OVER ONE MILE AND CAUSED DAMAGE TO TREES ALONG ITS PATH. SOME HOUSES WERE DAMAGED BY FALLING TREES. THE TORNADO AT ITS WIDEST WAS AROUND 200 YARDS. MAXIMUM WINDS WERE AROUND 95 MPH.

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
Sep 25, 1:36 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 7.2 hours before the alert went out and 90 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.

261 
WFUS53 KDVN 251912
TORDVN
IAC087-115-183-252000-
/O.NEW.KDVN.TO.W.0035.180925T1912Z-180925T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
212 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...
  Louisa County in southeastern Iowa...
  Southeastern Washington County in southeastern Iowa...

* Until 300 PM CDT.
    
* At 211 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Winfield, or 10 miles southwest of Columbus
  Junction, moving east at 40 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...
  Mount Union around 215 PM CDT.
  Columbus City around 220 PM CDT.
  Morning Sun around 225 PM CDT.
  Wapello, Grandview and Amber around 235 PM CDT.

Other locations impacted by this tornadic thunderstorm include Elrick
Junction, Cairo, Fredonia, Virginia Grove Recreation Area, Louisa
County Fairgrounds, Swedesburg, Snively Access Campground and Marsh.

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 4123 9161 4133 9115 4109 9105 4107 9127
      4108 9137 4106 9137 4105 9154
TIME...MOT...LOC 1911Z 257DEG 36KT 4115 9147 

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

$$

RP Kinney

3 follow-up statements

044 
WWUS53 KDVN 251919
SVSDVN

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

IAC087-183-251929-
/O.CAN.KDVN.TO.W.0035.000000T0000Z-180925T2000Z/
Henry IA-Washington IA-
219 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.

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

LAT...LON 4123 9147 4133 9115 4109 9105 4109 9127
      4110 9137 4116 9137 4116 9144
TIME...MOT...LOC 1919Z 257DEG 36KT 4117 9137 

$$

IAC115-252000-
/O.CON.KDVN.TO.W.0035.000000T0000Z-180925T2000Z/
Louisa IA-
219 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM CDT FOR
SOUTHWESTERN LOUISA COUNTY...
    
At 219 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Winfield, or 7 miles south of Columbus Junction,
moving east at 40 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...
  Morning Sun around 225 PM CDT.
  Wapello and Amber around 230 PM CDT.
  Grandview around 235 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Snively Access Campground, Marsh, Elrick Junction, Cairo and Virginia
Grove Recreation Area.

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 4123 9147 4133 9115 4109 9105 4109 9127
      4110 9137 4116 9137 4116 9144
TIME...MOT...LOC 1919Z 257DEG 36KT 4117 9137 

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

$$

RP Kinney

401 
WWUS53 KDVN 251929
SVSDVN

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

IAC115-252000-
/O.CON.KDVN.TO.W.0035.000000T0000Z-180925T2000Z/
Louisa IA-
229 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 PM CDT FOR SOUTH
CENTRAL LOUISA COUNTY...
    
At 228 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Wapello, moving east at 45 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...
  Amber around 235 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Snively Access Campground.

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 4125 9112 4113 9107 4113 9127 4124 9130
      4131 9114
TIME...MOT...LOC 1928Z 258DEG 39KT 4119 9122 

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

$$

RP Kinney

220 
WWUS53 KDVN 251939
SVSDVN

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

IAC115-251949-
/O.CAN.KDVN.TO.W.0035.000000T0000Z-180925T2000Z/
Louisa IA-
239 PM CDT TUE SEP 25 2018

...THE TORNADO WARNING FOR SOUTH CENTRAL LOUISA COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

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

LAT...LON 4125 9112 4113 9107 4113 9127 4124 9130
      4131 9114
TIME...MOT...LOC 1938Z 257DEG 36KT 4122 9107 

$$

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, 1:19 PM CDT	Tornado Warning	DVN	Henry, Louisa, Washington	41 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, 2:27 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.