Alert archive / Illinois / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 72, NWS Quad Cities, IA

August 10, 2021Carroll County, Jo Daviess County, Whiteside County, Illinois; Clinton County, Jackson County, Jones County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Aug 10, 2021, 5:00 PM CDT for Carroll County, Jo Daviess County, Whiteside County, Illinois; Clinton County, Jackson County, Jones County, Iowa. It was in force for 45 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: Aug 10, 2021, 5:00 PM CDT (22:00 UTC)
Expired: Aug 10, 2021, 5:45 PM CDT
In force: 45 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clinton County, IA, Jackson County, IA, Jones County, IA, Carroll County, IL, Jo Daviess County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 63 km from the middle of the area, began a volume at 22:05 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
Aug 10, 5:44 PM CDT	TSTM WND GST 46	Clinton Municipality, IA	AT CLINTON AIRPORT.

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
Aug 10, 3:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Aug 10, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.0 hours before the alert went out and 60 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: 3755 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

384 
WUUS53 KDVN 102200
SVRDVN
ILC015-085-195-IAC045-097-105-102245-
/O.NEW.KDVN.SV.W.0072.210810T2200Z-210810T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Quad Cities IA/IL
500 PM CDT Tue Aug 10 2021

The National Weather Service in the Quad Cities has issued a

* Severe Thunderstorm Warning for...
  Northwestern Whiteside County in northwestern Illinois...
  Jo Daviess County in northwestern Illinois...
  Central Carroll County in northwestern Illinois...
  Jackson County in east central Iowa...
  Southeastern Jones County in east central Iowa...
  Clinton County in east central Iowa...

* Until 545 PM CDT.

* At 500 PM CDT, severe thunderstorms were located along a line
  extending from near Schapville to Charlotte to 6 miles southeast of
  Stanwood, moving southeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Severe thunderstorms will be near...
  Preston, Hanover, Charlotte, Spragueville and Schapville around 
  505 PM CDT.
  Elizabeth, Woodbine and Miles around 510 PM CDT.
  Stockton, Low Moor, Andover and Massbach around 520 PM CDT.

Other locations in the path of these severe thunderstorms include
Camanche, Clinton, Fulton, Albany, East Clinton and Garden Plain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4235 8994 4220 8992 4220 8985 4179 9003
      4175 9025 4178 9025 4173 9036 4198 9095
      4219 9080 4238 9053 4238 9048 4240 9051
      4249 9038
TIME...MOT...LOC 2200Z 299DEG 32KT 4237 9029 4198 9049 4185 9105 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Speck

2 follow-up statements

105 
WWUS53 KDVN 102215
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
515 PM CDT Tue Aug 10 2021

ILC015-085-195-IAC045-097-105-102245-
/O.CON.KDVN.SV.W.0072.000000T0000Z-210810T2245Z/
Whiteside IL-Jo Daviess IL-Carroll IL-Jackson IA-Jones IA-Clinton IA-
515 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR NORTHWESTERN WHITESIDE...JO DAVIESS...CENTRAL CARROLL...
JACKSON...SOUTHEASTERN JONES AND CLINTON COUNTIES...

At 515 PM CDT, severe thunderstorms were located along a line
extending from near Shullsburg to near Green Island to near Wyoming,
moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Bellevue and Green Island around 520 PM CDT.

Other locations in the path of these severe thunderstorms include
Hanover, Savanna, Sabula, Hurstville, Massbach, Fulton, Maquoketa,
Delmar, Andrew, Mount Carroll, Preston, Charlotte and Spragueville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4235 8994 4220 8992 4220 8985 4179 9003
      4175 9025 4178 9025 4173 9036 4198 9095
      4219 9080 4238 9053 4238 9048 4240 9051
      4249 9038
TIME...MOT...LOC 2215Z 271DEG 27KT 4258 9019 4219 9039 4206 9095 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Speck

035 
WWUS53 KDVN 102227
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
527 PM CDT Tue Aug 10 2021

ILC015-085-195-IAC045-097-105-102245-
/O.CON.KDVN.SV.W.0072.000000T0000Z-210810T2245Z/
Whiteside IL-Jo Daviess IL-Carroll IL-Jackson IA-Jones IA-Clinton IA-
527 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR NORTH CENTRAL WHITESIDE...JO DAVIESS...CENTRAL CARROLL...
JACKSON...SOUTHEASTERN JONES AND NORTHERN CLINTON COUNTIES...

At 526 PM CDT, severe thunderstorms were located along a line
extending from Schapville to 6 miles northwest of Mount Carroll to
near Fairhaven, moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe thunderstorms will remain over mainly rural areas of
north central Whiteside, Jo Daviess, central Carroll, Jackson,
southeastern Jones and northern Clinton Counties, including the
following locations... Otter Creek, Whitton, North Hanover, Wacker,
Elizabeth Fairgrounds, Ideal, Aiken, Teeds Grove, Ustick and
Maquoketa Caves State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

&&

LAT...LON 4220 8991 4219 8991 4219 8985 4180 9002
      4195 9017 4201 9025 4192 9038 4197 9092
      4197 9094 4218 9079 4237 9052 4237 9047
      4238 9047 4238 9048 4239 9050 4248 9037
      4234 8994 4220 8992
TIME...MOT...LOC 2226Z 245DEG 33KT 4243 9021 4218 9003 4188 8990 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Speck

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:12 PM CDT	Tornado Warning Tornado observed	DVN	Bureau	48 min
Aug 9, 7:30 PM CDT	Tornado Warning Tornado observed	DVN	Bureau	45 min
Aug 9, 8:02 PM CDT	Flash Flood Warning	DVN	Bureau	2 hr
Aug 9, 8:16 PM CDT	Severe Thunderstorm Warning	DVN	Bureau, Putnam	29 min
Aug 9, 9:39 PM CDT	Special Weather Statement	DVN	Henry	36 min
Aug 9, 9:54 PM CDT	Special Weather Statement	DVN	Henry	51 min
Aug 9, 10:44 PM CDT	Special Weather Statement	DVN	Mercer	31 min
Aug 10, 2:28 PM CDT	Heat Advisory	DVN	Bureau, Carroll, Hancock, Henderson, Henry, Jo Daviess and 7 more	29 hr
Aug 10, 4:04 PM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess	56 min
Aug 10, 5:24 PM CDT	Severe Thunderstorm Warning	DVN	Carroll, Jo Daviess, Stephenson, Whiteside	51 min
Aug 10, 5:47 PM CDT	Special Weather Statement	DVN	Bureau	13 min
Aug 10, 5:47 PM CDT	Special Weather Statement	DVN	Bureau	13 min
Aug 10, 5:49 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	41 min
Aug 10, 6:16 PM CDT	Severe Thunderstorm Warning	DVN	Stephenson	13 min
Aug 10, 6:50 PM CDT	Severe Thunderstorm Warning	DVN	Bureau	25 min
Aug 10, 6:53 PM CDT	Special Weather Statement	DVN	Mercer, Warren	37 min
Aug 10, 2:33 PM CDT	Special Weather Statement	DVN	Buchanan	27 min
Aug 10, 2:42 PM CDT	Special Weather Statement	DVN	Benton	33 min
Aug 10, 2:55 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan	50 min
Aug 10, 3:07 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	23 min
Aug 10, 3:25 PM CDT	Severe Thunderstorm Warning	DVN	Buchanan, Delaware, Linn	50 min
Aug 10, 3:29 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque	31 min
Aug 10, 3:49 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Iowa	41 min
Aug 10, 4:28 PM CDT	Severe Thunderstorm Warning	DVN	Benton, Buchanan, Delaware, Linn	36 min
Aug 10, 4:38 PM CDT	Severe Thunderstorm Warning	DVN	Cedar, Jackson, Jones, Linn	52 min

Nearby

Severe Thunderstorm Warnings in Illinois, 2021 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.