Alert archive / Iowa / Tornado Warnings in 2020

Tornado Warning 21, NWS Quad Cities, IA

May 23, 2020Jackson County, Iowa

NWS Quad Cities, IA issued this tornado warning at May 23, 2020, 1:54 PM CDT for Jackson 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: May 23, 2020, 1:54 PM CDT (18:54 UTC)
Expired: May 23, 2020, 2:32 PM CDT
In force: 38 min
Issued by: NWS Quad Cities, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Jackson County, IA

The radar

The Quad Cities radar (KDVN), 52 km from the middle of the area, began a volume at 18:53 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
May 23, 2:24 PM CDT	TORNADO	1 Nne Andrew, IA	CORRECTED TIME. A TRAINED SPOTTER REPORTED A TORNADO ON THE GROUND 1 MILE NORTH NORTHEAST OF ANDREW.
May 23, 2:25 PM CDT	TORNADO	1 Nne Andrew, IA	A TRAINED SPOTTER REPORTED A TORNADO ON THE GROUND 1 MILE NORTH NORTHEAST OF ANDREW.

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
May 23, 12:33 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 6.9 hours before the alert went out and 52 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: 145 J/kg
Mixed-layer CIN: -133 J/kg
Mixed-layer LCL: 859 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 198 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

356 
WFUS53 KDVN 231854
TORDVN
IAC097-231945-
/O.NEW.KDVN.TO.W.0021.200523T1854Z-200523T1945Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Quad Cities IA/IL
154 PM CDT Sat May 23 2020

The National Weather Service in the Quad Cities has issued a

* Tornado Warning for...
  South central Jackson County in east central Iowa...

* Until 245 PM CDT.
    
* At 154 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Maquoketa, moving northeast at 15 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...
  Hurstville around 200 PM CDT.
  Andrew around 225 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Jackson County Fairgrounds.

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 4210 9040 4204 9053 4203 9069 4203 9071
      4207 9073 4221 9058
TIME...MOT...LOC 1854Z 222DEG 15KT 4205 9068 

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

$$

Gibbs

3 follow-up statements

628 
WWUS53 KDVN 231906
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
206 PM CDT Sat May 23 2020

IAC097-231945-
/O.CON.KDVN.TO.W.0021.000000T0000Z-200523T1945Z/
Jackson IA-
206 PM CDT Sat May 23 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM CDT FOR SOUTH
CENTRAL JACKSON COUNTY...
    
At 205 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Maquoketa, moving northeast at 15 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...
  Andrew around 220 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Jackson County Fairgrounds.

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.

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

&&

LAT...LON 4210 9040 4204 9053 4203 9067 4213 9067
      4221 9058
TIME...MOT...LOC 1905Z 244DEG 14KT 4206 9061 

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

$$

Uttech

165 
WWUS53 KDVN 231916
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
216 PM CDT Sat May 23 2020

IAC097-231945-
/O.CON.KDVN.TO.W.0021.000000T0000Z-200523T1945Z/
Jackson IA-
216 PM CDT Sat May 23 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM CDT FOR SOUTH
CENTRAL JACKSON COUNTY...
    
At 215 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Andrew moving northeast at 15 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
south central Jackson County.

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.

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

&&

LAT...LON 4210 9040 4204 9053 4203 9060 4216 9064
      4221 9058
TIME...MOT...LOC 1915Z 244DEG 15KT 4214 9059 

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

$$

Uttech

427 
WWUS53 KDVN 231932 RRA
SVSDVN

Severe Weather Statement
National Weather Service Quad Cities IA/IL
232 PM CDT Sat May 23 2020

IAC097-231942-
/O.CAN.KDVN.TO.W.0021.000000T0000Z-200523T1945Z/
Jackson IA-
232 PM CDT Sat May 23 2020

...THE TORNADO WARNING FOR SOUTH CENTRAL JACKSON COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with this thunderstorm.

A Tornado Watch remains in effect until 800 PM CDT for east central
Iowa.

LAT...LON 4210 9040 4204 9053 4203 9060 4216 9064
      4221 9058
TIME...MOT...LOC 1931Z 222DEG 15KT 4219 9052 

$$

Uttech

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 5:08 AM CDT	Special Weather Statement	DVN	Keokuk	37 min
May 23, 5:46 AM CDT	Special Weather Statement	DVN	Iowa, Jefferson, Keokuk	29 min
May 23, 6:22 AM CDT	Special Weather Statement	DVN	Washington	23 min
May 23, 6:29 AM CDT	Severe Thunderstorm Warning	DVN	Keokuk, Washington	31 min
May 23, 9:11 AM CDT	Special Weather Statement	DVN	Linn	34 min
May 23, 9:23 AM CDT	Special Weather Statement	DVN	Cedar	37 min
May 23, 10:02 AM CDT	Special Weather Statement	DVN	Scott	28 min
May 23, 12:18 PM CDT	Tornado Warning	DVN	Cedar, Johnson	42 min
May 23, 12:39 PM CDT	Tornado Warning	DVN	Cedar, Clinton	51 min
May 23, 12:50 PM CDT	Tornado Warning Tornado observed	DVN	Cedar, Jones	40 min
May 23, 12:59 PM CDT	Tornado Warning	DVN	Scott	46 min
May 23, 1:17 PM CDT	Tornado Warning	DVN	Clinton, Jackson	43 min
May 23, 1:18 PM CDT	Tornado Warning Tornado observed	DVN	Cedar, Jones	18 min
May 23, 1:29 PM CDT	Tornado Warning	DVN	Jones	16 min
May 23, 2:27 PM CDT	Tornado Warning Tornado observed	DVN	Jackson	34 min

Nearby

Tornado Warnings in Iowa, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.