Alert archive / Iowa / Tornado Warnings in 2021

Tornado Warning 16, NWS Quad Cities, IA

July 14, 2021Delaware County, Jones County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jul 14, 2021, 9:29 PM CDT for Delaware County, Jones County, Iowa. It was in force for 46 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: Jul 14, 2021, 9:29 PM CDT (02:29 UTC)
Expired: Jul 14, 2021, 10:15 PM CDT
In force: 46 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Delaware County, IA, Jones County, IA

The radar

The Quad Cities radar (KDVN), 91 km from the middle of the area, began a volume at 02:29 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
Jul 14, 9:44 PM CDT	TORNADO	4 Wnw Langworthy, IA	AN EF-1 TORNADO TOUCHED DOWN SOUTHWEST OF MONTICELLO DAMAGING OUTBUILDINGS AND SNAPPING LARGE TREES ON TWO FARMSTEADS.
Jul 14, 9:45 PM CDT	TSTM WND DMG	2 Sse Buck Creek, IA	DELAYED REPORT. LONG-TRACKED 30 FOOT WIDE SWATH OF CORN FLATTENED ACROSS FIELD. POSSIBLY DUE TO TORNADO. TIME ESTIMATED FROM SPOTTER OBSERVATION AND RADAR.
Jul 14, 9:50 PM CDT	TSTM WND DMG	4 Nw Langworthy, IA	DAMAGE TO HOME AND MACHINE SHED. REPORT RELAYED BY EM. POSSIBLE TORNADO. TIME ESTIMATED FROM RADAR.
Jul 14, 10:02 PM CDT	TORNADO	2 Sse Monticello Munici, IA	AN EF-1 TORNADO DEVELOPED SOUTHEAST OF MONTICELLO AND TRACKED ACROSS RURAL AREAS EAST OF MONTICELLO ALONG AN INTERMITTENT 8 MILE PATH THROUGH FARMLAND AND WOODED AREAS.

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
Jul 14, 6:13 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 2.5 hours before the alert went out and 94 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: 2569 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 832 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 253 m²/s²
0-3 km storm-relative helicity: 346 m²/s²
Significant tornado parameter: 3.2
Supercell composite: 23.4

Open this sounding in Storm Lab

The text

As transmitted.

817 
WFUS53 KDVN 150229
TORDVN
IAC055-105-150315-
/O.NEW.KDVN.TO.W.0016.210715T0229Z-210715T0315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
929 PM CDT Wed Jul 14 2021

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northwestern Jones County in east central Iowa...
  Southeastern Delaware County in northeastern Iowa...

* Until 1015 PM CDT.
    
* At 929 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Prairieburg, or 12 miles northwest of Anamosa,
  moving east 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...
  Hopkinton around 945 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Monticello and Langworthy.

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.

This storm has a history of producing tornadoes.  For your safety,
seek shelter now!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4230 9113 4229 9112 4217 9112 4220 9136
      4236 9136 4240 9113
TIME...MOT...LOC 0229Z 265DEG 27KT 4225 9142 

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

$$

Gibbs

3 follow-up statements

548 
WWUS53 KDVN 150246
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
946 PM CDT Wed Jul 14 2021

IAC055-150256-
/O.CAN.KDVN.TO.W.0016.000000T0000Z-210715T0315Z/
Delaware IA-
946 PM CDT Wed Jul 14 2021

...THE TORNADO WARNING FOR SOUTHEASTERN DELAWARE 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 midnight CDT for northeastern
and east central Iowa.

LAT...LON 4229 9112 4217 9112 4220 9136 4226 9136
      4230 9115 4230 9113
TIME...MOT...LOC 0246Z 270DEG 25KT 4221 9127 

$$

IAC105-150315-
/O.CON.KDVN.TO.W.0016.000000T0000Z-210715T0315Z/
Jones IA-
946 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
NORTHWESTERN JONES COUNTY...
    
At 946 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Langworthy, or 7 miles north of Anamosa, moving east
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.

Locations impacted include...
  Langworthy and Monticello.

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.

This storm has a history of producing tornadoes.  Seek shelter now!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4229 9112 4217 9112 4220 9136 4226 9136
      4230 9115 4230 9113
TIME...MOT...LOC 0246Z 270DEG 25KT 4221 9127 

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

$$

Gibbs

805 
WWUS53 KDVN 150252
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
952 PM CDT Wed Jul 14 2021

IAC105-150315-
/O.CON.KDVN.TO.W.0016.000000T0000Z-210715T0315Z/
Jones IA-
952 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
NORTHWESTERN JONES COUNTY...
    
At 952 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Monticello, or 8 miles north of Anamosa, moving east
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.

Locations impacted include...
Monticello, Langworthy, Jones County Fairgrounds and Monticello
Municipal Airport.

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.

This storm has a history of producing tornadoes.  Seek shelter now!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4229 9112 4217 9112 4220 9136 4226 9136
      4230 9115 4230 9113
TIME...MOT...LOC 0252Z 268DEG 25KT 4223 9122 

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

$$

Gibbs

967 
WWUS53 KDVN 150255
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
955 PM CDT Wed Jul 14 2021

IAC105-150315-
/O.CON.KDVN.TO.W.0016.000000T0000Z-210715T0315Z/
Jones IA-
955 PM CDT Wed Jul 14 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR NORTH
CENTRAL JONES COUNTY...
    
At 954 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Monticello, or 9 miles northeast of Anamosa, moving
east 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.

Locations impacted include...
Monticello, Jones County Fairgrounds and Monticello Municipal
Airport.

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.

This storm has a history of producing tornadoes.  Seek shelter now!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4228 9112 4218 9112 4220 9126 4226 9126
      4228 9114
TIME...MOT...LOC 0254Z 268DEG 25KT 4223 9120 

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

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 7:28 PM CDT	Tornado Warning	DVN	Buchanan, Delaware	17 min
Jul 14, 7:37 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Linn	38 min
Jul 14, 7:40 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware	35 min
Jul 14, 7:43 PM CDT	Tornado Warning	DVN	Benton	32 min
Jul 14, 7:43 PM CDT	Tornado Warning	DVN	Buchanan, Delaware	32 min
Jul 14, 7:53 PM CDT	Tornado Warning	DVN	Benton	27 min
Jul 14, 8:11 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	19 min
Jul 14, 8:14 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Linn	46 min
Jul 14, 8:19 PM CDT	Tornado Warning	DVN	Benton, Linn	22 min
Jul 14, 8:31 PM CDT	Tornado Warning	DVN	Benton, Linn	29 min
Jul 14, 8:56 PM CDT	Tornado Warning	DVN	Delaware, Linn	49 min
Jul 14, 9:08 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Iowa	32 min
Jul 14, 10:02 PM CDT	Tornado Warning	DVN	Jones	43 min
Jul 14, 10:14 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Johnson, Jones, Linn	46 min
Jul 14, 10:34 PM CDT	Tornado Warning	DVN	Cedar	26 min
Jul 14, 10:41 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	49 min
Jul 14, 10:52 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Clinton, Jones, Scott	38 min
Jul 14, 11:10 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson	50 min
Jul 15, 8:58 AM CDT	Special Weather Statement	DVN	Henry, Jefferson	47 min
Jul 15, 5:23 PM CDT	Special Weather Statement	DVN	Clinton	37 min

Nearby

Tornado Warnings in Iowa, 2021 Every tornado warning in 2021 Tornadoes in 2021

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.