Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Quad Cities, IA

July 14, 2021Delaware County, Dubuque County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 14, 2021, 8:11 PM CDT for Delaware County, Dubuque County, Iowa. It was in force for 19 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 14, 2021, 8:11 PM CDT (01:11 UTC)
Expired: Jul 14, 2021, 8:30 PM CDT
In force: 19 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Delaware County, IA, Dubuque County, IA

The radar

The Quad Cities radar (KDVN), 120 km from the middle of the area, began a volume at 01:15 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.

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, 1.2 hours before the alert went out and 121 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.

150 
WUUS53 KDVN 150111
SVRDVN
IAC055-061-150145-
/O.NEW.KDVN.SV.W.0051.210715T0111Z-210715T0145Z/

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

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Northwestern Dubuque County in northeastern Iowa...
  Northeastern Delaware County in northeastern Iowa...

* Until 845 PM CDT.

* At 810 PM CDT, a severe thunderstorm was located over Greeley, or 8
  miles northeast of Manchester, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Colesburg around 820 PM CDT.
  Luxemburg around 830 PM CDT.

Other locations in the path of this severe thunderstorm include Holy
Cross and Balltown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

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

&&

LAT...LON 4266 9082 4265 9081 4248 9139 4261 9148
      4264 9140 4265 9090 4268 9090
TIME...MOT...LOC 0110Z 244DEG 39KT 4257 9134 

HAIL...1.00IN
WIND...60MPH
 
$$

DC

2 follow-up statements

685 
WWUS53 KDVN 150121
SVSDVN

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

IAC055-061-150145-
/O.CON.KDVN.SV.W.0051.000000T0000Z-210715T0145Z/
Dubuque IA-Delaware IA-
821 PM CDT Wed Jul 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 845 PM CDT
FOR NORTHWESTERN DUBUQUE AND NORTHEASTERN DELAWARE COUNTIES...

At 821 PM CDT, a severe thunderstorm was located over Colesburg, or
12 miles south of Guttenberg, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe storm will be near...
  Luxemburg around 830 PM CDT.

Other locations in the path of this severe thunderstorm include Holy
Cross and Balltown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 4266 9082 4265 9081 4248 9139 4261 9148
      4264 9140 4265 9090 4268 9090
TIME...MOT...LOC 0121Z 244DEG 39KT 4262 9119 

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

DC

307 
WWUS53 KDVN 150130
SVSDVN

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

IAC055-061-150140-
/O.CAN.KDVN.SV.W.0051.000000T0000Z-210715T0145Z/
Dubuque IA-Delaware IA-
830 PM CDT Wed Jul 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN DUBUQUE AND
NORTHEASTERN DELAWARE COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

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

LAT...LON 4266 9082 4265 9081 4248 9139 4261 9148
      4264 9140 4265 9090 4268 9090
TIME...MOT...LOC 0130Z 244DEG 39KT 4267 9106 

$$

DC

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, 8:14 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, 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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.