Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 24, NWS Quad Cities, IA

May 10, 2017Des Moines County, Henry County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 10, 2017, 3:22 PM CDT for Des Moines County, Henry County, Iowa. It was in force for 53 min. 3 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: May 10, 2017, 3:22 PM CDT (20:22 UTC)
Expired: May 10, 2017, 4:15 PM CDT
In force: 53 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Des Moines County, IA, Henry County, IA

The radar

The Quad Cities radar (KDVN), 92 km from the middle of the area, began a volume at 20:26 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, 4:08 PM CDT	HAIL 0.25	1 Ese New London, IA
May 10, 4:13 PM CDT	HAIL 1	3 Ssw New London, IA
May 10, 4:15 PM CDT	TSTM WND DMG	Middletown, IA	SEVERAL LARGE TREE BRANCHES DOWN IN TOWN. TIME ESTIMATED FROM RADAR DATA.

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, 8.4 hours before the alert went out and 96 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.

952 
WFUS53 KDVN 102022
TORDVN
IAC057-087-102115-
/O.NEW.KDVN.TO.W.0024.170510T2022Z-170510T2115Z/

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

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Southeastern Henry County in southeastern Iowa...
  Des Moines County in southeastern Iowa...

* Until 415 PM CDT
    
* At 322 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over New London, or 7 miles southeast of Mount
  Pleasant, moving east at 35 mph.

  HAZARD...Tornado and quarter 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...
  Danville around 330 PM CDT. 
  Middletown around 335 PM CDT. 
  West Burlington and Mediapolis around 345 PM CDT. 
  Burlington around 350 PM CDT. 
  Gulf Port around 355 PM CDT. 
  Oquawka around 405 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Big
Hollow Recreation Area, Pleasant Grove, Dodgeville, Beaverdale, Des
Moines County Fairgrounds, Kingston, Starr's Cave Park and Preserve,
Burlington Regional Airport, Sperry and Prairie Grove.

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 4085 9151 4097 9151 4103 9094 4098 9096
      4096 9095 4093 9096 4090 9101 4082 9109
      4077 9109
TIME...MOT...LOC 2022Z 268DEG 30KT 4091 9142 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Gibbs

2 follow-up statements

838 
WWUS53 KDVN 102041
SVSDVN

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

IAC087-102050-
/O.CAN.KDVN.TO.W.0024.000000T0000Z-170510T2115Z/
Henry IA-
341 PM CDT WED MAY 10 2017

...THE TORNADO WARNING FOR SOUTHEASTERN HENRY 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 warning remains in effect until 430 PM CDT.

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

LAT...LON 4090 9137 4098 9137 4103 9094 4098 9096
      4096 9095 4093 9096 4090 9101 4085 9106
TIME...MOT...LOC 2040Z 260DEG 34KT 4093 9125 

$$

IAC057-102115-
/O.CON.KDVN.TO.W.0024.000000T0000Z-170510T2115Z/
Des Moines IA-
341 PM CDT WED MAY 10 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CDT FOR NORTHERN
DES MOINES COUNTY...
    
At 340 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Danville, or 10 miles northwest of Burlington,
moving east at 40 mph.

HAZARD...Tornado and quarter 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...
  Mediapolis around 350 PM CDT. 
  Oquawka around 405 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Big
Hollow Recreation Area, Kingston, Pleasant Grove, Dodgeville, Sperry
and Prairie Grove.

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 4090 9137 4098 9137 4103 9094 4098 9096
      4096 9095 4093 9096 4090 9101 4085 9106
TIME...MOT...LOC 2040Z 260DEG 34KT 4093 9125 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Gibbs

096 
WWUS53 KDVN 102045
SVSDVN

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

IAC057-102115-
/O.CON.KDVN.TO.W.0024.000000T0000Z-170510T2115Z/
Des Moines IA-
345 PM CDT WED MAY 10 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 415 PM CDT FOR NORTHERN
DES MOINES COUNTY...
    
At 345 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Mediapolis, or 11 miles northwest of Burlington,
moving east at 30 mph.

HAZARD...Tornado and quarter 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...
  Mediapolis around 355 PM CDT. 
  Oquawka around 415 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Big
Hollow Recreation Area, Kingston, Pleasant Grove, Dodgeville and
Sperry.

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 4094 9131 4099 9132 4102 9101 4103 9094
      4098 9096 4096 9095 4093 9096 4090 9101
      4088 9103
TIME...MOT...LOC 2045Z 259DEG 26KT 4096 9123 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

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, 3:35 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee, Van Buren	55 min
May 10, 3:50 PM CDT	Tornado Warning	DVN	Des Moines	40 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.