Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 33, NWS Quad Cities, IA

September 25, 2018Louisa County, Muscatine County, Iowa

NWS Quad Cities, IA issued this tornado warning at Sep 25, 2018, 1:49 PM CDT for Louisa County, Muscatine County, Iowa. It was in force for 41 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: Sep 25, 2018, 1:49 PM CDT (18:49 UTC)
Expired: Sep 25, 2018, 2:30 PM CDT
In force: 41 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Louisa County, IA, Muscatine County, IA

The radar

The Quad Cities radar (KDVN), 63 km from the middle of the area, began a volume at 18:53 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
Sep 25, 1:36 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 6.8 hours before the alert went out and 69 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.

357 
WFUS53 KDVN 251849
TORDVN
IAC115-139-251930-
/O.NEW.KDVN.TO.W.0033.180925T1849Z-180925T1930Z/

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

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Central Louisa County in southeastern Iowa...
  South central Muscatine County in east central Iowa...

* Until 230 PM CDT.
    
* At 148 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Columbus City, or near Columbus Junction, moving
  northeast 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...
  Grandview around 205 PM CDT.
  Letts around 210 PM CDT.
  Fruitland around 220 PM CDT.
  Muscatine around 230 PM CDT.

Other locations impacted by this tornadic thunderstorm include Cairo,
Fredonia, Ardon, Muscatine Municipal Airport, Flaming Prairie Park
and Louisa County Fairgrounds.

This storm has a history of producing tornadoes.  For your safety,
seek shelter now!

LAT...LON 4124 9140 4143 9118 4133 9107 4130 9107
      4129 9109 4125 9111 4124 9111 4123 9110
      4118 9133
TIME...MOT...LOC 1848Z 235DEG 22KT 4123 9132 

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

$$

RP Kinney

2 follow-up statements

803 
WWUS53 KDVN 251901
SVSDVN

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

IAC115-139-251930-
/O.CON.KDVN.TO.W.0033.000000T0000Z-180925T1930Z/
Louisa IA-Muscatine IA-
201 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR CENTRAL
LOUISA AND SOUTH CENTRAL MUSCATINE COUNTIES...
    
At 201 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Grandview, or near Wapello, moving northeast 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...
  Fruitland around 215 PM CDT.
  Muscatine around 230 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Muscatine Municipal Airport and Flaming Prairie Park.

LAT...LON 4129 9129 4140 9115 4133 9107 4130 9107
      4129 9109 4126 9111 4122 9122
TIME...MOT...LOC 1901Z 244DEG 26KT 4126 9121 

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

$$

RP Kinney

543 
WWUS53 KDVN 251915
SVSDVN

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

IAC139-251925-
/O.CAN.KDVN.TO.W.0033.000000T0000Z-180925T1930Z/
Muscatine IA-
215 PM CDT TUE SEP 25 2018

...THE TORNADO WARNING FOR SOUTH CENTRAL MUSCATINE COUNTY 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 4133 9114 4133 9107 4130 9107 4129 9109
      4126 9111 4126 9113
TIME...MOT...LOC 1915Z 244DEG 27KT 4130 9108 

$$

IAC115-251930-
/O.CON.KDVN.TO.W.0033.000000T0000Z-180925T1930Z/
Louisa IA-
215 PM CDT TUE SEP 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR CENTRAL
LOUISA COUNTY...
    
At 215 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Fruitland, or 7 miles south of Muscatine, moving
northeast 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 tornadic thunderstorm will remain over mainly rural areas of
central Louisa County, including the following locations... Flaming
Prairie Park.

LAT...LON 4133 9114 4133 9107 4130 9107 4129 9109
      4126 9111 4126 9113
TIME...MOT...LOC 1915Z 244DEG 27KT 4130 9108 

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

$$

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, 1:51 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.