Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 25, NWS Quad Cities, IA

May 10, 2017Des Moines County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 10, 2017, 3:50 PM CDT for Des Moines County, Iowa. It was in force for 40 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: May 10, 2017, 3:50 PM CDT (20:50 UTC)
Expired: May 10, 2017, 4:30 PM CDT
In force: 40 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Des Moines County, IA

The radar

The Quad Cities radar (KDVN), 80 km from the middle of the area, began a volume at 20:50 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.

What was reported inside it

Time	Report	Where	Remark
May 10, 3:58 PM CDT	FUNNEL CLOUD	S Mediapolis, IA	MOVING EAST.

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
May 10, 12:59 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.8 hours before the alert went out and 85 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: 1131 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

450 
WFUS53 KDVN 102050
TORDVN
IAC057-102130-
/O.NEW.KDVN.TO.W.0025.170510T2050Z-170510T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
350 PM CDT WED MAY 10 2017

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northern Des Moines County in southeastern Iowa...

* Until 430 PM CDT
    
* At 350 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Mediapolis, or 11 miles west of Oquawka, moving
  east 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
  northern Des Moines County, including the following locations:
  Northfield, Kossuth and 4th Pumping Station 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 4098 9132 4103 9130 4107 9115 4107 9095
      4103 9094 4102 9097
TIME...MOT...LOC 2050Z 259DEG 25KT 4100 9116 

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

$$

Gibbs

2 follow-up statements

683 
WWUS53 KDVN 102112
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
412 PM CDT WED MAY 10 2017

IAC057-102130-
/O.CON.KDVN.TO.W.0025.000000T0000Z-170510T2130Z/
Des Moines IA-
412 PM CDT WED MAY 10 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
NORTHEASTERN DES MOINES COUNTY...
    
At 412 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Oakville, or 7 miles northwest of Oquawka, moving
east 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. 

Locations impacted include...
Kossuth, Northfield and 4th Pumping Station 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 4100 9113 4107 9116 4107 9095 4103 9094
      4102 9097
TIME...MOT...LOC 2112Z 258DEG 26KT 4104 9101 

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

$$

Gibbs

206 
WWUS53 KDVN 102120
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
420 PM CDT WED MAY 10 2017

IAC057-102130-
/O.EXP.KDVN.TO.W.0025.000000T0000Z-170510T2130Z/
Des Moines IA-
420 PM CDT WED MAY 10 2017

...THE TORNADO WARNING FOR NORTHEASTERN DES MOINES COUNTY WILL EXPIRE
AT 430 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Des Moines County until 430 PM CDT.

A severe thunderstorm watch remains in effect until 800 PM CDT for
west central Illinois...and southeastern Iowa.

LAT...LON 4100 9113 4107 9116 4107 9095 4103 9094
      4102 9097
TIME...MOT...LOC 2120Z 259DEG 25KT 4105 9096 

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 9:17 AM CDT	Special Weather Statement	DVN	Washington	28 min
May 10, 1:47 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	43 min
May 10, 2:34 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Van Buren	56 min
May 10, 2:48 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	42 min
May 10, 2:52 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	7 min
May 10, 3:13 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	33 min
May 10, 3:22 PM CDT	Tornado Warning	DVN	Des Moines, Henry	53 min
May 10, 3:35 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee, Van Buren	55 min
May 10, 3:56 PM CDT	Tornado Warning	DVN	Des Moines	23 min

Nearby

Tornado Warnings in Iowa, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.