Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 28, NWS Quad Cities, IA

September 3, 20184 counties in Iowa

NWS Quad Cities, IA issued this tornado warning at Sep 3, 2018, 5:15 PM CDT for 4 counties in Iowa. It was in force for 45 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: Sep 3, 2018, 5:15 PM CDT (22:15 UTC)
Expired: Sep 3, 2018, 6:00 PM CDT
In force: 45 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Buchanan County, IA, Delaware County, IA, Jones County, IA, Linn County, IA

The radar

The Quad Cities radar (KDVN), 108 km from the middle of the area, began a volume at 22:17 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
Sep 3, 5:29 PM CDT	TORNADO	2 Nw Alburnett, IA	EF1 PEAK WINDS 110 MPH, PATH LENGTH 2.5 MILES, WIDTH 100 YARDS, DURATION 529 PM TO 536 PM.
Sep 3, 5:37 PM CDT	TORNADO	2 N Alburnett, IA	EMA RELAYED REPORT OF A TORNADO ON THE GROUND NORTH OF ALBURNETT.
Sep 3, 5:44 PM CDT	TORNADO	2 Sw Central City., IA	2 DIFFERENT LAW ENFORCEMENT OFFICERS REPORTING A CYCLIC TORNADO ON THE GROUND.
Sep 3, 6:08 PM CDT	TORNADO	1 Wsw Prairieburg, IA	LAW ENFORCEMENT OBSERVED A BRIEF TORNADO WITH NO VISIBLE DAMAGE.
Sep 3, 6:08 PM CDT	TORNADO	2 Sw Prairieburg, IA	TORNADO TOUCHED DOWN AND THEN LIFTED BACK UP.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 113 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: 1178 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 851 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 107 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

As transmitted.

502 
WFUS53 KDVN 032215
TORDVN
IAC019-055-105-113-032300-
/O.NEW.KDVN.TO.W.0028.180903T2215Z-180903T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
515 PM CDT MON SEP 3 2018

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Southeastern Buchanan County in northeastern Iowa...
  Northwestern Jones County in east central Iowa...
  Southwestern Delaware County in northeastern Iowa...
  Northern Linn County in east central Iowa...

* Until 600 PM CDT.
    
* At 514 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Center Point, or 13 miles east of Vinton, moving
  northeast 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 dangerous storm will be near...
  Alburnett around 525 PM CDT.
  Troy Mills around 530 PM CDT.
  Paris around 535 PM CDT.
  Central City around 540 PM CDT.
  Coggon around 545 PM CDT.
  Prairieburg around 550 PM CDT.
  Ryan around 555 PM CDT.
  Delhi around 600 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Pinicon Ridge Park, Buck Creek, Robinson, Baileys Ford Park,
Lafayette, Buffalo Creek Park, Howard H Cherry Scout Reservation,
Pleasant Creek State Recreation Area, Turtle Creek Park and Linn
County Fairgrounds.

This includes Interstate 380 between mile markers 29 and 39.
 
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 4227 9121 4206 9178 4213 9184 4213 9183
      4225 9183 4250 9140
TIME...MOT...LOC 2214Z 238DEG 24KT 4218 9177 

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

$$

16

5 follow-up statements

579 
WWUS53 KDVN 032226
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
526 PM CDT MON SEP 3 2018

IAC019-032236-
/O.CAN.KDVN.TO.W.0028.000000T0000Z-180903T2300Z/
Buchanan IA-
526 PM CDT MON SEP 3 2018

...THE TORNADO WARNING FOR SOUTHEASTERN BUCHANAN COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

LAT...LON 4209 9169 4224 9176 4238 9130 4235 9128
      4226 9124 4222 9135
TIME...MOT...LOC 2226Z 255DEG 22KT 4218 9167 

$$

IAC055-105-113-032300-
/O.CON.KDVN.TO.W.0028.000000T0000Z-180903T2300Z/
Jones IA-Delaware IA-Linn IA-
526 PM CDT MON SEP 3 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
NORTHWESTERN JONES...SOUTH CENTRAL DELAWARE AND NORTHERN LINN
COUNTIES...
    
At 526 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Alburnett, or 14 miles north of Cedar Rapids, moving
east at 25 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...
  Alburnett around 530 PM CDT.
  Paris around 540 PM CDT.
  Central City around 545 PM CDT.
  Coggon around 550 PM CDT.
  Prairieburg around 555 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Buffalo Creek Park, Pinicon Ridge Park, Buck Creek, Howard H Cherry
Scout Reservation, Lafayette and Linn  County Fairgrounds.

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 4209 9169 4224 9176 4238 9130 4235 9128
      4226 9124 4222 9135
TIME...MOT...LOC 2226Z 255DEG 22KT 4218 9167 

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

$$

16

286 
WWUS53 KDVN 032234
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
534 PM CDT MON SEP 3 2018

IAC055-105-113-032300-
/O.CON.KDVN.TO.W.0028.000000T0000Z-180903T2300Z/
Jones IA-Delaware IA-Linn IA-
534 PM CDT MON SEP 3 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
NORTHWESTERN JONES...SOUTH CENTRAL DELAWARE AND NORTHEASTERN LINN
COUNTIES...
    
At 534 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Alburnett, or 14 miles north of Cedar Rapids, moving
east at 20 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...
  Paris around 540 PM CDT.
  Central City around 545 PM CDT.
  Coggon around 555 PM CDT.
  Prairieburg around 600 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Buffalo Creek Park, Pinicon Ridge Park, Buck Creek, Howard H Cherry
Scout Reservation and Linn  County Fairgrounds.

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 4211 9164 4226 9170 4238 9130 4235 9128
      4226 9124 4222 9135
TIME...MOT...LOC 2234Z 257DEG 18KT 4218 9162 

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

$$

16

579 
WWUS53 KDVN 032241
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
541 PM CDT MON SEP 3 2018

IAC055-105-113-032300-
/O.CON.KDVN.TO.W.0028.000000T0000Z-180903T2300Z/
Jones IA-Delaware IA-Linn IA-
541 PM CDT MON SEP 3 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
NORTHWESTERN JONES...SOUTH CENTRAL DELAWARE AND NORTHEASTERN LINN
COUNTIES...
    
At 540 PM CDT, a confirmed tornado was located north of Alburnett, 
or 15 miles north of Cedar Rapids, moving east at 20 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Weather spotters confirmed tornado.

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 tornado will be near...
  Central City around 545 PM CDT.
  Coggon around 555 PM CDT.
  Prairieburg around 600 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Buffalo Creek Park, Pinicon Ridge Park, Buck Creek, Howard H Cherry
Scout Reservation and Linn  County Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4211 9164 4226 9170 4238 9130 4235 9128
      4226 9124 4222 9135
TIME...MOT...LOC 2240Z 257DEG 18KT 4218 9158 

TORNADO...OBSERVED
HAIL...1.00IN

$$

16

569 
WWUS53 KDVN 032249
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
549 PM CDT MON SEP 3 2018

IAC055-105-032258-
/O.CAN.KDVN.TO.W.0028.000000T0000Z-180903T2300Z/
Jones IA-Delaware IA-
549 PM CDT MON SEP 3 2018

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

LAT...LON 4222 9136 4211 9164 4226 9170 4229 9136
TIME...MOT...LOC 2248Z 255DEG 24KT 4219 9152 

$$

IAC113-032300-
/O.CON.KDVN.TO.W.0028.000000T0000Z-180903T2300Z/
Linn IA-
549 PM CDT MON SEP 3 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
NORTHEASTERN LINN COUNTY...
    
At 548 PM CDT, a confirmed a cyclic tornado was located over Central 
City, or 13 miles northwest of Anamosa, moving east at 25 mph.

HAZARD...Damaging tornado and quarter size hail.

SOURCE...Weather spotters confirmed tornado.

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 tornado will be near...
  Prairieburg around 600 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Pinicon Ridge Park, Howard H Cherry Scout Reservation and Linn
County Fairgrounds.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4222 9136 4211 9164 4226 9170 4229 9136
TIME...MOT...LOC 2248Z 255DEG 24KT 4219 9152 

TORNADO...OBSERVED
HAIL...1.00IN

$$

16

264 
WWUS53 KDVN 032259
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
559 PM CDT MON SEP 3 2018

IAC113-032309-
/O.EXP.KDVN.TO.W.0028.000000T0000Z-180903T2300Z/
Linn IA-
559 PM CDT MON SEP 3 2018

...THE TORNADO WARNING FOR NORTHEASTERN LINN COUNTY WILL EXPIRE AT
600 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

LAT...LON 4222 9136 4211 9164 4226 9170 4229 9136
TIME...MOT...LOC 2259Z 249DEG 21KT 4221 9147 

$$

Nichols

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 2, 7:12 PM CDT	Special Weather Statement	DVN	Clinton	33 min
Sep 2, 7:23 PM CDT	Special Weather Statement	DVN	Muscatine	37 min
Sep 2, 7:34 PM CDT	Special Weather Statement	DVN	Jefferson	56 min
Sep 2, 7:39 PM CDT	Flash Flood Warning	DVN	Muscatine	2 hr
Sep 3, 9:19 AM CDT	River Flood Warning	DVN	Cedar, Johnson, Linn	9 days
Sep 3, 10:15 AM CDT	River Flood Warning	DVN	Buchanan, Linn	7 days
Sep 3, 3:53 PM CDT	Special Weather Statement	DVN	Buchanan	67 min
Sep 3, 4:21 PM CDT	Special Weather Statement	DVN	Scott	24 min
Sep 3, 4:41 PM CDT	Tornado Warning	DVN	Benton, Buchanan, Linn	34 min
Sep 3, 6:05 PM CDT	Tornado Warning	DVN	Delaware, Dubuque, Jones, Linn	40 min
Sep 3, 6:21 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	39 min

Nearby

Tornado Warnings in Iowa, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.