Alert archive / Iowa / Tornado Warnings in 2022

Tornado Warning 21, NWS Quad Cities, IA

August 20, 2022Jones County, Iowa

NWS Quad Cities, IA issued this tornado warning at Aug 20, 2022, 12:07 PM CDT for Jones County, Iowa. It was in force for 38 min. 2 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: Aug 20, 2022, 12:07 PM CDT (17:07 UTC)
Expired: Aug 20, 2022, 12:45 PM CDT
In force: 38 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Jones County, IA

The radar

The Quad Cities radar (KDVN), 75 km from the middle of the area, began a volume at 17:09 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 20, 12:20 PM CDT	TSTM WND DMG	1 Nnw Scotch Grove, IA	EM RELAYED POSSIBLE TORNADO TOUCHDOWN, DAMAGE TO CROPS. WILL INVESTIGATE FURTHER.
Aug 20, 12:20 PM CDT	TORNADO	1 Nnw Scotch Grove, IA	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 NNW SCOTCH GROVE. JONES COUNTY EM REPORTED THAT COUNTY LAW ENFORCEMENT PERSONNEL WERE FOLLOWING A MINI SUPERCELL THAT HAD PRODUCED FUNNEL CLOUDS. A FUNNEL CLOUD EVENTUALLY TOUCHED DOWN AND LAW ENFORCEMENT REPORTED S

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, 5.1 hours before the alert went out and 78 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: 245 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 737 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

910 
WFUS53 KDVN 201707
TORDVN
IAC105-201745-
/O.NEW.KDVN.TO.W.0021.220820T1707Z-220820T1745Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
1207 PM CDT Sat Aug 20 2022

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  Northeastern Jones County in east central Iowa...

* Until 1245 PM CDT.
    
* At 1207 PM CDT, a severe thunderstorm capable of producing a
  tornado was located over Scotch Grove, or 9 miles northeast of
  Anamosa, moving northeast at 10 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...
  Camp Courageous and Pictured Rocks Wildlife Area around 1220 PM 
  CDT.

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 9116 4213 9123 4229 9108 4219 9092
TIME...MOT...LOC 1707Z 226DEG 8KT 4217 9111 

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

$$

Speck

3 follow-up statements

500 
WWUS53 KDVN 201710
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1210 PM CDT Sat Aug 20 2022

IAC105-201745-
/O.CON.KDVN.TO.W.0021.000000T0000Z-220820T1745Z/
Jones IA-
1210 PM CDT Sat Aug 20 2022

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR
NORTHEASTERN JONES COUNTY...
        
At 1209 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Scotch Grove, or 10 miles northeast of Anamosa,
moving northeast at 10 mph.

HAZARD...Tornado.

SOURCE...Emergency Management reported a funnel cloud near to the 
         ground around 1205 PM.

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...
  Camp Courageous and Pictured Rocks Wildlife Area around 1220 PM 
  CDT.

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 9116 4213 9123 4229 9108 4219 9092
TIME...MOT...LOC 1709Z 226DEG 8KT 4217 9110 

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

$$

Speck

716 
WWUS53 KDVN 201719
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1219 PM CDT Sat Aug 20 2022

IAC105-201745-
/O.CON.KDVN.TO.W.0021.000000T0000Z-220820T1745Z/
Jones IA-
1219 PM CDT Sat Aug 20 2022

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR
NORTHEASTERN JONES COUNTY...
    
At 1218 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Scotch Grove, or 11 miles northeast of Anamosa,
moving northeast at 10 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 tornadic thunderstorm will remain over mainly rural areas of
northeastern Jones County, including the following locations...
Scotch Grove, Pictured Rocks Wildlife Area and Camp Courageous.

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 4215 9111 4220 9117 4221 9116 4227 9105
      4219 9092
TIME...MOT...LOC 1718Z 226DEG 8KT 4219 9108 

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

$$

Gibbs

710 
WWUS53 KDVN 201728
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
1228 PM CDT Sat Aug 20 2022

IAC105-201745-
/O.CON.KDVN.TO.W.0021.000000T0000Z-220820T1745Z/
Jones IA-
1228 PM CDT Sat Aug 20 2022

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR
NORTHEASTERN JONES COUNTY...
    
At 1228 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Camp Courageous, or 13 miles northeast of Anamosa,
moving northeast at 10 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 tornadic thunderstorm will remain over mainly rural areas of
northeastern Jones County, including the following locations... Camp
Courageous.

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 4216 9108 4220 9113 4222 9111 4226 9104
      4219 9092
TIME...MOT...LOC 1728Z 226DEG 8KT 4221 9106 

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

$$

Gibbs

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 7:12 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Muscatine	48 min
Aug 19, 7:31 PM CDT	Severe Thunderstorm Warning	DVN	Washington	44 min
Aug 19, 7:38 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Muscatine	37 min
Aug 19, 8:08 PM CDT	Flash Flood Warning	DVN	Louisa, Muscatine, Washington	4 hr
Aug 19, 8:10 PM CDT	Special Weather Statement	DVN	Cedar, Jones, Louisa, Muscatine	50 min
Aug 19, 8:31 PM CDT	Severe Thunderstorm Warning	DVN	Louisa, Muscatine	29 min
Aug 19, 8:37 PM CDT	Special Weather Statement	DVN	Clinton, Jackson, Jones, Scott	53 min
Aug 19, 8:46 PM CDT	Severe Thunderstorm Warning	DVN	Jones	29 min
Aug 19, 9:01 PM CDT	Special Weather Statement	DVN	Dubuque	59 min
Aug 19, 9:04 PM CDT	Severe Thunderstorm Warning	DVN	Delaware, Dubuque, Jones	41 min
Aug 19, 10:27 PM CDT	Special Weather Statement	DVN	Washington	33 min
Aug 19, 10:59 PM CDT	Special Weather Statement	DVN	Muscatine	46 min
Aug 20, 11:46 AM CDT	Special Weather Statement	DVN	Jones	29 min
Aug 20, 12:24 PM CDT	Tornado Warning	DVN	Clinton, Scott	21 min
Aug 20, 3:07 PM CDT	Tornado Warning	DVN	Clinton, Jones	23 min
Aug 20, 4:33 PM CDT	Special Weather Statement	DVN	Benton, Buchanan, Cedar, Clinton, Delaware, Dubuque and 10 more	117 min

Nearby

Tornado Warnings in Iowa, 2022 Every tornado warning in 2022 Tornadoes in 2022

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.