Alert archive / Iowa / Tornado Warnings in 2017

Tornado Warning 28, NWS Quad Cities, IA

May 17, 20174 counties in Iowa

NWS Quad Cities, IA issued this tornado warning at May 17, 2017, 3:49 PM CDT for 4 counties in Iowa. It was in force for 41 min. 4 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, 3:49 PM CDT (20:49 UTC)
Expired: May 17, 2017, 4:30 PM CDT
In force: 41 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.5 in

Counties Henry County, IA, Jefferson County, IA, Van Buren County, IA, Washington County, IA

The radar

The Quad Cities radar (KDVN), 123 km from the middle of the area, began a volume at 20:51 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, 4:10 PM CDT	TSTM WND GST 55	Fairfield, IA
May 17, 4:11 PM CDT	TSTM WND DMG	Fairfield, IA	2 SEMIS ON HWY 34 BLOWN OVER
May 17, 4:16 PM CDT	TORNADO 1	4 W Pleasant Plain, IA	A RAPIDLY MOVING EF-1 TORNADO MOVED ALMOST DUE NORTH FROM ABOUT 4 MILES WEST OF PLEASANT PLAIN IN JEFFERSON COUNTY TO ABOUT 1.5 MILES WEST OF LAKE DARLING STATE PARK IN WASHINGTON COUNTY DAMAGING FARM OUTBUILDINGS AND TREES. ESTIMATED PEAK WINDS WERE 110 MPH.
May 17, 4:20 PM CDT	TSTM WND DMG	1 E Rubio, IA	TIME ESTIMATED - SEVERAL TREES DAMAGED. BOARDS BLOWN OFF RAILROAD WALKWAY, GROUND COVERED WITH LEAVES

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, 8.8 hours before the alert went out and 129 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.

050 
WFUS53 KDVN 172049
TORDVN
IAC087-101-177-183-172130-
/O.NEW.KDVN.TO.W.0028.170517T2049Z-170517T2130Z/

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

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northwestern Henry County in southeastern Iowa...
  Northeastern Van Buren County in southeastern Iowa...
  Southern Washington County in southeastern Iowa...
  Jefferson County in southeastern Iowa...

* Until 430 PM CDT
    
* At 348 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Keosauqua, moving north 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...
  Birmingham and Stockport around 355 PM CDT. 
  Fairfield, Lockridge and Maharishi Vedic City around 410 PM CDT. 
  Brighton, Pleasant Plain and Coppock around 420 PM CDT. 
  Washington around 430 PM CDT. 

Other locations impacted by this tornadic thunderstorm include West
Chester, Washington Airport, Glasgow, Morris Park, Mount Zion, Utica,
Germanville, Haskins, Jefferson County Park and Collett.

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 4117 9198 4117 9194 4135 9195 4140 9194
      4133 9149 4067 9184 4071 9207
TIME...MOT...LOC 2048Z 192DEG 46KT 4078 9194 

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

$$

12

3 follow-up statements

520 
WWUS53 KDVN 172100 RRA
SVSDVN

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

IAC087-101-177-183-172130-
/O.CON.KDVN.TO.W.0028.000000T0000Z-170517T2130Z/
Henry IA-Van Buren IA-Washington IA-Jefferson IA-
400 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
NORTHWESTERN HENRY...NORTHEASTERN VAN BUREN...SOUTHERN WASHINGTON AND
JEFFERSON COUNTIES...
    
At 400 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Birmingham, or near Fairfield, moving north 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...
  Lockridge around 405 PM CDT. 
  Fairfield and Maharishi Vedic City around 410 PM CDT. 
  Pleasant Plain around 415 PM CDT. 
  Brighton and Coppock around 420 PM CDT. 
  Washington around 430 PM CDT. 

Other locations impacted by this tornadic thunderstorm include West
Chester, Fairfield Municipal Airport, Noble, Washington Airport,
Perlee, East Pleasant Plain, Marr Park, Glasgow, Morris Park and
Utica.

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 4117 9198 4117 9194 4135 9195 4140 9194
      4133 9149 4079 9180 4084 9204
TIME...MOT...LOC 2100Z 190DEG 46KT 4093 9192 

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

$$

12

910 
WWUS53 KDVN 172104
SVSDVN

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

IAC177-172113-
/O.CAN.KDVN.TO.W.0028.000000T0000Z-170517T2130Z/
Van Buren IA-
404 PM CDT WED MAY 17 2017

...THE TORNADO WARNING FOR NORTHEASTERN VAN BUREN COUNTY 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 southeastern
Iowa.

LAT...LON 4116 9198 4116 9195 4117 9194 4136 9195
      4140 9194 4133 9149 4090 9172 4090 9203
TIME...MOT...LOC 2103Z 186DEG 44KT 4097 9192 

$$

IAC087-101-183-172130-
/O.CON.KDVN.TO.W.0028.000000T0000Z-170517T2130Z/
Henry IA-Washington IA-Jefferson IA-
404 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
NORTHWESTERN HENRY...SOUTHERN WASHINGTON AND JEFFERSON COUNTIES...
    
At 403 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Fairfield, moving north 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 dangerous storm will be near...
  Brighton and Pleasant Plain around 420 PM CDT. 

Other locations impacted by this tornadic thunderstorm include West
Chester, Fairfield Municipal Airport, Noble, Washington Airport,
Perlee, East Pleasant Plain, Marr Park, Glasgow, Merrimac and
Germanville.

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 9198 4116 9195 4117 9194 4136 9195
      4140 9194 4133 9149 4090 9172 4090 9203
TIME...MOT...LOC 2103Z 186DEG 44KT 4097 9192 

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

$$

Gibbs

015 
WWUS53 KDVN 172116
SVSDVN

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

IAC087-101-183-172130-
/O.CON.KDVN.TO.W.0028.000000T0000Z-170517T2130Z/
Henry IA-Washington IA-Jefferson IA-
416 PM CDT WED MAY 17 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR
NORTHWESTERN HENRY...SOUTHERN WASHINGTON AND NORTHEASTERN JEFFERSON
COUNTIES...
    
At 416 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Pleasant Plain, or 9 miles northeast of Fairfield,
moving north 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...
  Brighton and Coppock around 420 PM CDT. 
  Washington around 430 PM CDT. 

Other locations impacted by this tornadic thunderstorm include West
Chester, Noble, Washington Airport, Perlee, East Pleasant Plain, Marr
Park, Merrimac, Germanville, Haskins and Mac Coon Access.

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 9198 4116 9195 4117 9194 4136 9195
      4140 9194 4133 9149 4104 9165 4106 9199
TIME...MOT...LOC 2116Z 193DEG 50KT 4112 9187 

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 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, 3:55 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, 6:19 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, 6:38 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.