Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 3, NWS Quad Cities, IA

May 2, 2018Keokuk County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 2, 2018, 6:47 PM CDT for Keokuk County, Iowa. It was in force for 43 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: May 2, 2018, 6:47 PM CDT (23:47 UTC)
Expired: May 2, 2018, 7:30 PM CDT
In force: 43 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Keokuk County, IA

The radar

The Quad Cities radar (KDVN), 133 km from the middle of the area, began a volume at 23:50 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
May 2, 3:56 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 11.8 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1837 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 243 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

221 
WFUS53 KDVN 022347
TORDVN
IAC107-030030-
/O.NEW.KDVN.TO.W.0003.180502T2347Z-180503T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
647 PM CDT WED MAY 2 2018

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northern Keokuk County in southeastern Iowa...

* Until 730 PM CDT
    
* At 647 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over What Cheer, or 7 miles northwest of Sigourney,
  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...
  Sigourney around 700 PM CDT. 
  South English around 720 PM CDT. 
  Harper around 725 PM CDT. 
  Kinross around 730 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Webster, Keokuk County Fairgrounds, Yenruogis County Park, Lake Belva
Deer Park, Keota and Sigourney Iowa Airport.

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 4150 9199 4134 9196 4135 9241 4141 9241
TIME...MOT...LOC 2347Z 260DEG 22KT 4138 9235 

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

$$

Gibbs

4 follow-up statements

822 
WWUS53 KDVN 022355
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
655 PM CDT WED MAY 2 2018

IAC107-030030-
/O.CON.KDVN.TO.W.0003.000000T0000Z-180503T0030Z/
Keokuk IA-
655 PM CDT WED MAY 2 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR NORTHERN
KEOKUK COUNTY...
    
At 655 PM CDT, a severe thunderstorm capable of producing a tornado
was located over What Cheer, or near Sigourney, moving east at 25
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 dangerous storm will be near...
  Sigourney around 705 PM CDT. 
  South English and Harper around 725 PM CDT. 
  Kinross around 730 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Webster, Yenruogis County Park, Lake Belva Deer Park, Keota and
Sigourney Iowa Airport.

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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4150 9199 4134 9196 4135 9235 4142 9236
TIME...MOT...LOC 2355Z 259DEG 21KT 4139 9230 

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

$$

Gibbs

483 
WWUS53 KDVN 030001
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
701 PM CDT WED MAY 2 2018

IAC107-030030-
/O.CON.KDVN.TO.W.0003.000000T0000Z-180503T0030Z/
Keokuk IA-
701 PM CDT WED MAY 2 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
NORTHEASTERN KEOKUK COUNTY...
    
At 700 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Keswick, or near Sigourney, moving east at 25 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 dangerous storm will be near...
  South English around 720 PM CDT. 
  Harper around 725 PM CDT. 
  Kinross around 730 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Webster, Yenruogis County Park, Lake Belva Deer Park, Keota and
Sigourney Iowa Airport.

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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4150 9199 4134 9196 4135 9229 4144 9229
TIME...MOT...LOC 0000Z 260DEG 22KT 4140 9225 

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

$$

Gibbs

546 
WWUS53 KDVN 030015
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
715 PM CDT WED MAY 2 2018

IAC107-030030-
/O.CON.KDVN.TO.W.0003.000000T0000Z-180503T0030Z/
Keokuk IA-
715 PM CDT WED MAY 2 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 730 PM CDT FOR
NORTHEASTERN KEOKUK COUNTY...
    
At 715 PM CDT, a severe thunderstorm capable of producing a tornado
was located near South English, or near Sigourney, moving east at 25
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 dangerous storm will be near...
  South English around 720 PM CDT. 
  Harper around 725 PM CDT. 
  Kinross around 730 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Webster, Yenruogis County Park, Lake Belva Deer Park, Keota and
Sigourney Iowa Airport.

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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4150 9199 4134 9196 4138 9223 4145 9223
TIME...MOT...LOC 0015Z 260DEG 22KT 4142 9213 

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

$$

Gibbs

977 
WWUS53 KDVN 030028 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
728 PM CDT WED MAY 2 2018

IAC107-030037-
/O.EXP.KDVN.TO.W.0003.000000T0000Z-180503T0030Z/
Keokuk IA-
728 PM CDT WED MAY 2 2018

...THE TORNADO WARNING FOR NORTHEASTERN KEOKUK COUNTY WILL EXPIRE AT
730 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.  However
small hail and gusty winds are still possible with this thunderstorm.

A severe thunderstorm watch remains in effect until 1100 PM CDT for
southeastern Iowa.

Remember, a Severe Thunderstorm Warning still remains in effect for
Keokuk County until 730 PM CDT.

LAT...LON 4150 9199 4134 9196 4138 9223 4145 9223
TIME...MOT...LOC 0027Z 260DEG 22KT 4143 9205 

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 8:14 PM CDT	Special Weather Statement	DVN	Delaware	46 min
May 1, 8:25 PM CDT	Severe Thunderstorm Warning	DVN	Delaware	35 min
May 1, 10:01 PM CDT	River Flood Warning	DVN	Dubuque	12 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Clinton	15 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Scott	15 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Muscatine	18 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Louisa, Muscatine	19 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Louisa	21 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Des Moines, Louisa	21 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Des Moines	23 days
May 1, 10:01 PM CDT	River Flood Warning	DVN	Des Moines, Lee	23 days
May 2, 4:27 PM CDT	Special Weather Statement	DVN	Jefferson	33 min
May 2, 4:31 PM CDT	Special Weather Statement	DVN	Clinton	29 min
May 2, 4:39 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	38 min
May 2, 5:00 PM CDT	Special Weather Statement	DVN	Washington	45 min
May 2, 5:04 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	56 min
May 2, 6:20 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	15 min
May 2, 6:34 PM CDT	Severe Thunderstorm Warning	DVN	Keokuk	56 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.