Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 30, NWS Quad Cities, IA

May 17, 2017Mercer County, Rock Island County, Illinois; 4 counties in Iowa

NWS Quad Cities, IA issued this tornado warning at May 17, 2017, 4:40 PM CDT for Mercer County, Rock Island County, Illinois; 4 counties in Iowa. It was in force for 50 min. 6 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 17, 2017, 4:40 PM CDT (21:40 UTC)
Expired: May 17, 2017, 5:30 PM CDT
In force: 50 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

Counties Des Moines County, IA, Henry County, IA, Louisa County, IA, Muscatine County, IA, Mercer County, IL, Rock Island County, IL

The radar

The Quad Cities radar (KDVN), 69 km from the middle of the area, began a volume at 21:43 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 17, 4:45 PM CDT	HAIL 1.75	Wapello, IA	ESTIMATED FROM PICTURE VIA SOCIAL MEDIA.
May 17, 4:52 PM CDT	HAIL 1	Sse Grandview, IA	DELAYED REPORT, TIME ESTIMATED
May 17, 5:04 PM CDT	TORNADO	5 Sse Muscatine, IL	SHORT-LIVED EF0 TORNADO WAS OBSERVED BY A STORM CHASER. VIDEO EVIDENCE OF THE CIRCULATION DETAILED A TORNADO THAT LASTED AROUND A MIN. NO DAMAGE WAS OBSERVED. THE PEAK WINDS WERE ESTIMATED AROUND 70 MPH.
May 17, 5:11 PM CDT	HAIL 1	3 Ne Muscatine, IA
May 17, 5:14 PM CDT	HAIL 0.88	3 Ne Muscatine, IA
May 17, 5:23 PM CDT	HAIL 1.75	3 S Durant, IA

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 17, 3:44 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.7 hours before the alert went out and 75 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: 103 J/kg
Mixed-layer CIN: -348 J/kg
Mixed-layer LCL: 1223 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 79 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

416 
WFUS53 KDVN 172140
TORDVN
ILC131-161-IAC057-087-115-139-172230-
/O.NEW.KDVN.TO.W.0030.170517T2140Z-170517T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
440 PM CDT WED MAY 17 2017

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Southwestern Rock Island County in northwestern Illinois...
  Northwestern Mercer County in northwestern Illinois...
  Northeastern Henry County in southeastern Iowa...
  North central Des Moines County in southeastern Iowa...
  Louisa County in southeastern Iowa...
  Muscatine County in east central Iowa...

* Until 530 PM CDT
    
* At 439 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Wapello, moving northeast at 55 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...
  Grandview around 445 PM CDT. 
  Letts around 450 PM CDT. 
  Fruitland around 455 PM CDT. 
  Muscatine around 505 PM CDT. 
  Durant and Wilton around 515 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Cranston, Muscatine County Fairgrounds, Elrick Junction, Fredonia,
Midway Beach, New Era, Pleasant Prairie, Moscow, Fairport Recreation
Area and Wildcat Den State Park.

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 4116 9151 4116 9148 4122 9149 4142 9139
      4142 9137 4148 9137 4160 9132 4160 9079
      4151 9078 4100 9119 4113 9152
TIME...MOT...LOC 2139Z 209DEG 49KT 4119 9128 

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

$$

12

3 follow-up statements

124 
WWUS53 KDVN 172155
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
455 PM CDT WED MAY 17 2017

IAC057-087-172204-
/O.CAN.KDVN.TO.W.0030.000000T0000Z-170517T2230Z/
Henry IA-Des Moines IA-
455 PM CDT WED MAY 17 2017

...THE TORNADO WARNING FOR NORTHEASTERN HENRY AND NORTH CENTRAL DES
MOINES COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved north 
out of the warned area.Therefore, the warning has been cancelled.

A tornado watch remains in effect until 1100 PM CDT for northwestern
Illinois...and southeastern and east central Iowa.

LAT...LON 4127 9141 4142 9139 4142 9137 4148 9137
      4160 9132 4160 9079 4151 9078 4112 9110
TIME...MOT...LOC 2154Z 210DEG 46KT 4132 9115 

$$

ILC131-161-IAC115-139-172230-
/O.CON.KDVN.TO.W.0030.000000T0000Z-170517T2230Z/
Rock Island IL-Mercer IL-Louisa IA-Muscatine IA-
455 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
SOUTHWESTERN ROCK ISLAND...NORTHWESTERN MERCER...CENTRAL LOUISA AND
MUSCATINE COUNTIES...
    
At 454 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Fruitland, or 7 miles southwest of Muscatine, moving
northeast at 45 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...
  Muscatine and Fairport around 510 PM CDT. 
  Wilton around 515 PM CDT. 
  Durant around 520 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Cranston, Muscatine County Fairgrounds, Fredonia, Midway Beach, New
Era, Pleasant Prairie, Moscow, Fairport Recreation Area, Wildcat Den
State Park and Saulsbury Bridge 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 4127 9141 4142 9139 4142 9137 4148 9137
      4160 9132 4160 9079 4151 9078 4112 9110
TIME...MOT...LOC 2154Z 210DEG 46KT 4132 9115 

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

$$

12

361 
WWUS53 KDVN 172208
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
508 PM CDT WED MAY 17 2017

ILC131-IAC115-172217-
/O.CAN.KDVN.TO.W.0030.000000T0000Z-170517T2230Z/
Mercer IL-Louisa IA-
508 PM CDT WED MAY 17 2017

...THE TORNADO WARNING FOR NORTHWESTERN MERCER AND CENTRAL LOUISA
COUNTIES IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 1100 PM CDT for northwestern
Illinois...and east central Iowa.

LAT...LON 4149 9122 4160 9116 4159 9079 4151 9078
      4133 9099 4138 9126
TIME...MOT...LOC 2207Z 209DEG 49KT 4149 9103 

$$

ILC161-IAC139-172230-
/O.CON.KDVN.TO.W.0030.000000T0000Z-170517T2230Z/
Rock Island IL-Muscatine IA-
508 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR
SOUTHWESTERN ROCK ISLAND AND MUSCATINE COUNTIES...
    
At 507 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Muscatine, moving northeast at 50 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 tornadic thunderstorm will remain over mainly rural areas of
southwestern Rock Island and Muscatine Counties, including the
following locations: Wildcat Den State Park, Saulsbury Bridge
Campground, Shady Creek Campground, New Era, Ardon, Pleasant Prairie,
Muscatine Municipal Airport, Moscow, Stockton and Sweetland Center.

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 4149 9122 4160 9116 4159 9079 4151 9078
      4133 9099 4138 9126
TIME...MOT...LOC 2207Z 209DEG 49KT 4149 9103 

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

$$

12

512 
WWUS53 KDVN 172229
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
529 PM CDT WED MAY 17 2017

IAC139-ILC161-172237-
/O.EXP.KDVN.TO.W.0030.000000T0000Z-170517T2230Z/
Rock Island IL-Muscatine IA-
529 PM CDT WED MAY 17 2017

...THE TORNADO WARNING FOR SOUTHWESTERN ROCK ISLAND AND MUSCATINE
COUNTIES WILL EXPIRE AT 530 PM CDT...
        
The storm which prompted the warning has moved north out of the area 
and appears to have lost the ability to produce a tornado.
.
Therefore, the warning will be allowed to expire.  However hail is 
still possible with this thunderstorm as it moves north.

A tornado watch remains in effect until 1100 PM CDT for northwestern
Illinois...and east central Iowa.

LAT...LON 4149 9122 4160 9116 4159 9079 4151 9078
      4133 9099 4138 9126
TIME...MOT...LOC 2227Z 209DEG 49KT 4167 9089 

$$

12

The office that day

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

Issued	Product	Office	Counties	Lasted
May 17, 9:16 AM CDT	Special Weather Statement	DVN	Rock Island	29 min
May 17, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	Rock Island	30 min
May 17, 5:56 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	34 min
May 17, 6:38 PM CDT	Severe Thunderstorm Warning	DVN	Mercer, Rock Island	52 min
May 17, 1:23 AM CDT	Special Weather Statement	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Jones and 3 more	37 min
May 17, 8:50 AM CDT	Special Weather Statement	DVN	Scott	25 min
May 17, 3:16 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Linn	43 min
May 17, 3:36 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones, Linn	54 min
May 17, 3:38 PM CDT	Tornado Warning	DVN	Jefferson, Keokuk, Washington	52 min
May 17, 3:45 PM CDT	Severe Thunderstorm Warning	DVN	Des Moines, Henry, Lee, Van Buren	30 min
May 17, 3:49 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Van Buren, Washington	41 min
May 17, 3:55 PM CDT	Tornado Warning	DVN	Des Moines, Henry, Lee, Louisa, Van Buren	50 min
May 17, 4:23 PM CDT	Severe Thunderstorm Warning	DVN	Iowa, Johnson, Washington	44 min
May 17, 5:03 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Keokuk	57 min
May 17, 5:39 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Jefferson, Keokuk, Van Buren, Washington	66 min
May 17, 5:50 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Iowa, Johnson, Linn and 1 more	55 min
May 17, 5:54 PM CDT	Severe Thunderstorm Warning	DVN	Jefferson, Van Buren	51 min
May 17, 6:01 PM CDT	Tornado Warning	DVN	Henry, Jefferson, Lee, Van Buren	59 min
May 17, 6:19 PM CDT	Tornado Warning	DVN	Johnson, Louisa, Washington	41 min
May 17, 6:28 PM CDT	Flash Flood Warning	DVN	Johnson, Linn	3 hr
May 17, 6:31 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Cedar, Clinton, Delaware, Dubuque, Jackson and 5 more	59 min
May 17, 6:32 PM CDT	Tornado Warning Tornado observed	DVN	Delaware, Dubuque, Jones, Linn	43 min
May 17, 6:48 PM CDT	Tornado Warning	DVN	Cedar, Johnson, Muscatine	42 min

Nearby

Tornado Warnings in Iowa, 2017 Tornado Warnings in Illinois, 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.