Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 32, NWS Quad Cities, IA

May 17, 2017Johnson County, Louisa County, Washington County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 17, 2017, 6:19 PM CDT for Johnson County, Louisa County, Washington County, Iowa. It was in force for 41 min. 5 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, 6:19 PM CDT (23:19 UTC)
Expired: May 17, 2017, 7:00 PM CDT
In force: 41 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Johnson County, IA, Louisa County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 96 km from the middle of the area, began a volume at 23:21 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, 6:35 PM CDT	TSTM WND GST 67	Washington, IA
May 17, 6:36 PM CDT	TORNADO	7 Ne Washington, IA	AN EF-1 TORNADO SPUN UP AND TRACKED RAPIDLY TO THE NORTHEAST. THE TORNADO DAMAGED NUMEROUS FARM OUTBUILDINGS, POWER LINES, AND TREES ALONG THE PATH. THE PEAK WIND SPEED WAS 110 MPH WITH A PATH LENGTH OF 5.95 MILES AND A MAX WIDTH OF 40 YARDS.
May 17, 6:46 PM CDT	HAIL 1.5	Sw Riverside, IA
May 17, 6:48 PM CDT	TSTM WND DMG	Lone Tree, IA	PARKED SEMI BLOWN OVER AND DAMAGE TO FARM OUTBUILDINGS. POWER POLES DOWN. STRAIGHT LINE WIND DAMAGE.
May 17, 6:49 PM CDT	TSTM WND DMG	Lone Tree, IA	BARN BLOWN DOWN IN LONE TREE ON 640TH AND SOO, REPORTED BY SHERIFFS DEPUTY TO EM. TIME ESTIMATED

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, 11.3 hours before the alert went out and 102 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.

108 
WFUS53 KDVN 172319
TORDVN
IAC103-115-183-180000-
/O.NEW.KDVN.TO.W.0032.170517T2319Z-170518T0000Z/

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

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northwestern Louisa County in southeastern Iowa...
  Southeastern Johnson County in east central Iowa...
  Washington County in southeastern Iowa...

* Until 700 PM CDT
    
* At 619 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Brighton, or 10 miles southwest of Washington,
  moving northeast at 55 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...
  Washington around 630 PM CDT. 
  Ainsworth around 635 PM CDT. 
  Riverside around 645 PM CDT. 
  Lone Tree around 650 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Haskins, West Chester, Lake Darling State Park, Washington Airport,
Washington County Fairgrounds, Marr Park, River Junction, Rubio and
Gladwin.

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.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
the Quad Cities.

&&

LAT...LON 4164 9137 4134 9137 4116 9176 4116 9194
      4117 9195 4129 9195
TIME...MOT...LOC 2319Z 235DEG 47KT 4123 9187 

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

$$

Gibbs

4 follow-up statements

229 
WWUS53 KDVN 172329
SVSDVN

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

IAC103-115-183-180000-
/O.CON.KDVN.TO.W.0032.000000T0000Z-170518T0000Z/
Louisa IA-Johnson IA-Washington IA-
629 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHWESTERN LOUISA...SOUTHEASTERN JOHNSON AND CENTRAL WASHINGTON
COUNTIES...
    
At 629 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Washington, moving northeast at 45 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...
  Ainsworth around 640 PM CDT. 
  Riverside around 650 PM CDT. 
  Lone Tree around 700 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Haskins, West Chester, Washington Airport, Washington County
Fairgrounds, Marr Park, River Junction and Gladwin.

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 4164 9137 4134 9137 4116 9176 4131 9192
TIME...MOT...LOC 2329Z 241DEG 37KT 4133 9176 

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

$$

Gibbs

592 
WWUS53 KDVN 172334
SVSDVN

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

IAC103-115-183-180000-
/O.CON.KDVN.TO.W.0032.000000T0000Z-170518T0000Z/
Louisa IA-Johnson IA-Washington IA-
634 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHWESTERN LOUISA...SOUTHEASTERN JOHNSON AND EASTERN WASHINGTON
COUNTIES...
    
At 634 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Ainsworth, or near Washington, moving northeast at
60 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...
  Lone Tree around 650 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Haskins, Marr Park, River Junction, Washington Airport and Gladwin.

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 4164 9137 4134 9137 4124 9161 4137 9182
TIME...MOT...LOC 2334Z 244DEG 51KT 4136 9161 

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

$$

Gibbs

396 
WWUS53 KDVN 172337
SVSDVN

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

IAC103-115-183-180000-
/O.CON.KDVN.TO.W.0032.000000T0000Z-170518T0000Z/
Louisa IA-Johnson IA-Washington IA-
637 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHWESTERN LOUISA...SOUTHEASTERN JOHNSON AND NORTHEASTERN
WASHINGTON COUNTIES...
    
At 637 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Riverside, or 8 miles northeast of Washington,
moving northeast at 55 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...
  Lone Tree around 650 PM CDT. 

Other locations impacted by this tornadic thunderstorm include River
Junction and Gladwin.

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 4164 9137 4134 9137 4134 9164 4142 9174
TIME...MOT...LOC 2337Z 233DEG 47KT 4139 9158 

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

$$

Gibbs

984 
WWUS53 KDVN 172342 CCA
SVSDVN

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

IAC103-115-183-180000-
/O.COR.KDVN.TO.W.0032.000000T0000Z-170518T0000Z/
Louisa IA-Johnson IA-Washington IA-
642 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 700 PM CDT FOR
NORTHWESTERN LOUISA...SOUTHEASTERN JOHNSON AND NORTHEASTERN
WASHINGTON COUNTIES...
    
At 642 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Riverside, or 11 miles northeast of Washington,
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...
  Lone Tree around 650 PM CDT. 

Other locations impacted by this tornadic thunderstorm include River
Junction and Gladwin.

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 4164 9137 4134 9137 4134 9164 4142 9174
TIME...MOT...LOC 2337Z 231DEG 47KT 4139 9158 

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

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
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, 4:40 PM CDT	Tornado Warning	DVN	Des Moines, Henry, Louisa, Muscatine	50 min
May 17, 5:03 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa, Keokuk	57 min
May 17, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Muscatine, Scott	30 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, 6:28 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, 6:38 PM CDT	Severe Thunderstorm Warning	DVN	Henry, Louisa, Muscatine, Washington	52 min
May 17, 6:48 PM CDT	Tornado Warning	DVN	Cedar, Johnson, Muscatine	42 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.