Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 56, NWS Quad Cities, IA

July 14, 20214 counties in Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 14, 2021, 10:52 PM CDT for 4 counties in Iowa. It was in force for 38 min. 1 report 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, 10:52 PM CDT (03:52 UTC)
Expired: Jul 14, 2021, 11:30 PM CDT
In force: 38 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Cedar County, IA, Clinton County, IA, Jones County, IA, Scott County, IA

The radar

The Quad Cities radar (KDVN), 25 km from the middle of the area, began a volume at 03:53 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, 10:56 PM CDT	TSTM WND GST 60	1 W New Liberty, IA	HAM RADIO RELAY OF ESTIMATED 60 MPH WIND GUST JUST WEST OF NEW LIBERTY.

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, 3.9 hours before the alert went out and 27 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.

265 
WUUS53 KDVN 150352
SVRDVN
IAC031-045-105-163-150430-
/O.NEW.KDVN.SV.W.0056.210715T0352Z-210715T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
1052 PM CDT Wed Jul 14 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Eastern Cedar County in east central Iowa...
  Northern Scott County in east central Iowa...
  Southeastern Jones County in east central Iowa...
  Clinton County in east central Iowa...

* Until 1130 PM CDT.

* At 1052 PM CDT, severe thunderstorms were located along a line
  extending from near Oxford Junction to Bennett to near Wilton,
  moving east at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Wheatland, Lost Nation and Toronto around 1100 PM CDT.
  Calamus around 1105 PM CDT.
  Grand Mound and Donahue around 1110 PM CDT.

Other locations in the path of these severe thunderstorms include
Walcott, Delmar, Welton, Eldridge, DeWitt, Long Grove, Charlotte,
McCausland, Davenport and Low Moor.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight CDT for east central
Iowa.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4202 9033 4175 9033 4159 9054 4163 9116
      4173 9108 4201 9105
TIME...MOT...LOC 0352Z 270DEG 39KT 4201 9093 4173 9095 4161 9110 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Speck

3 follow-up statements

145 
WWUS53 KDVN 150403
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1103 PM CDT Wed Jul 14 2021

IAC105-150412-
/O.CAN.KDVN.SV.W.0056.000000T0000Z-210715T0430Z/
Jones IA-
1103 PM CDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JONES COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until midnight CDT for east central
Iowa.

LAT...LON 4190 9033 4175 9033 4159 9054 4162 9100
      4189 9094
TIME...MOT...LOC 0402Z 269DEG 39KT 4188 9080 4173 9081 4161 9096 

$$

IAC031-045-163-150430-
/O.CON.KDVN.SV.W.0056.000000T0000Z-210715T0430Z/
Cedar IA-Scott IA-Clinton IA-
1103 PM CDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR SOUTHEASTERN CEDAR...NORTHERN SCOTT AND SOUTHWESTERN CLINTON
COUNTIES...

At 1102 PM CDT, severe thunderstorms were located along a line
extending from near Toronto to 7 miles south of Calamus to near 
Durant, moving east at 45 mph. Trained weather spottered reported a 
60 MPH wind gust in New Liberty at 1056 PM.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Calamus around 1105 PM CDT.
  Grand Mound and Donahue around 1110 PM CDT.

Other locations in the path of these severe thunderstorms include
Walcott, DeWitt, Long Grove, McCausland, Davenport, Eldridge, Low
Moor and Clinton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight CDT for east central
Iowa.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

For your protection move to an interior room on the lowest floor of a
sturdy building.

&&

LAT...LON 4190 9033 4175 9033 4159 9054 4162 9100
      4189 9094
TIME...MOT...LOC 0402Z 269DEG 39KT 4188 9080 4173 9081 4161 9096 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Speck

746 
WWUS53 KDVN 150415
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1115 PM CDT Wed Jul 14 2021

IAC031-150425-
/O.CAN.KDVN.SV.W.0056.000000T0000Z-210715T0430Z/
Cedar IA-
1115 PM CDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CEDAR COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until midnight CDT for east central
Iowa.

LAT...LON 4190 9033 4175 9033 4159 9054 4161 9079
      4189 9071
TIME...MOT...LOC 0415Z 270DEG 39KT 4188 9063 4173 9064 4161 9079 

$$

IAC045-163-150430-
/O.CON.KDVN.SV.W.0056.000000T0000Z-210715T0430Z/
Scott IA-Clinton IA-
1115 PM CDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR NORTHERN SCOTT AND SOUTHWESTERN CLINTON COUNTIES...

At 1115 PM CDT, severe thunderstorms were located along a line
extending from near Welton to near Donahue to Walcott, moving east at
45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  DeWitt and Long Grove around 1120 PM CDT.

Other locations in the path of these severe thunderstorms include
Davenport, Eldridge, McCausland, Low Moor and Clinton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until midnight CDT for east central
Iowa.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

&&

LAT...LON 4190 9033 4175 9033 4159 9054 4161 9079
      4189 9071
TIME...MOT...LOC 0415Z 270DEG 39KT 4188 9063 4173 9064 4161 9079 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

Speck

496 
WWUS53 KDVN 150425
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1125 PM CDT Wed Jul 14 2021

IAC045-163-150435-
/O.EXP.KDVN.SV.W.0056.000000T0000Z-210715T0430Z/
Scott IA-Clinton IA-
1125 PM CDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN SCOTT AND
SOUTHWESTERN CLINTON COUNTIES WILL EXPIRE AT 1130 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Tornado Watch remains in effect until midnight CDT for east central
Iowa.

LAT...LON 4190 9033 4175 9033 4159 9054 4161 9079
      4189 9071
TIME...MOT...LOC 0425Z 270DEG 39KT 4188 9051 4173 9052 4161 9067 

$$

Speck

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, 9:29 PM CDT	Tornado Warning	DVN	Delaware, Jones	46 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, 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

Severe Thunderstorm Warnings in Iowa, 2021 Every severe thunderstorm warning 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.