Alert archive / Iowa / Tornado Warnings in 2020

Tornado Warning 13, NWS Des Moines, IA

May 26, 2020Audubon County, Guthrie County, Iowa

NWS Des Moines, IA issued this tornado warning at May 26, 2020, 3:57 PM CDT for Audubon County, Guthrie County, Iowa. It was in force for 21 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: May 26, 2020, 3:57 PM CDT (20:57 UTC)
Expired: May 26, 2020, 4:18 PM CDT
In force: 21 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Audubon County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 80 km from the middle of the area, began a volume at 20:56 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
May 26, 1:20 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.0 hours before the alert went out and 145 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 534 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

719 
WFUS53 KDMX 262057
TORDMX
IAC009-077-262130-
/O.NEW.KDMX.TO.W.0013.200526T2057Z-200526T2130Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
357 PM CDT Tue May 26 2020

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Western Guthrie County in west central Iowa...
  East central Audubon County in west central Iowa...

* Until 430 PM CDT.

* At 356 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 11 miles southwest of Guthrie Center, moving north at
  20 mph.

  HAZARD...Tornado.

  SOURCE...Weather spotters reported funnel cloud.

  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
  western Guthrie and east central Audubon Counties.

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 4152 9462 4152 9468 4177 9485 4181 9460
TIME...MOT...LOC 2056Z 171DEG 18KT 4156 9466 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Martin

2 follow-up statements

620 
WWUS53 KDMX 262111
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
411 PM CDT Tue May 26 2020

IAC009-077-262130-
/O.CON.KDMX.TO.W.0013.000000T0000Z-200526T2130Z/
Guthrie IA-Audubon IA-
411 PM CDT Tue May 26 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR WESTERN
GUTHRIE AND EAST CENTRAL AUDUBON COUNTIES...
    
At 410 PM CDT, a severe thunderstorm capable of producing a tornado
was located 9 miles west of Guthrie Center, moving north at 20 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
western Guthrie and east central Audubon Counties.

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 4157 9462 4156 9471 4177 9485 4181 9460
TIME...MOT...LOC 2110Z 171DEG 18KT 4163 9468 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

Podrazik

370 
WWUS53 KDMX 262118
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
418 PM CDT Tue May 26 2020

IAC009-077-262127-
/O.CAN.KDMX.TO.W.0013.000000T0000Z-200526T2130Z/
Guthrie IA-Audubon IA-
418 PM CDT Tue May 26 2020

...THE TORNADO WARNING FOR WESTERN GUTHRIE AND EAST CENTRAL AUDUBON
COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

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

LAT...LON 4157 9462 4156 9471 4177 9485 4181 9460
TIME...MOT...LOC 2115Z 171DEG 18KT 4167 9469 

$$

Podrazik

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 26, 1:25 PM CDT	Tornado Warning Tornado observed	DMX	Dallas	35 min
May 26, 1:49 PM CDT	Tornado Warning	DMX	Boone, Dallas	26 min
May 26, 2:22 PM CDT	Tornado Warning	DMX	Poweshiek, Tama	38 min
May 26, 2:25 PM CDT	Tornado Warning	DMX	Boone, Webster	35 min
May 26, 3:47 PM CDT	Tornado Warning	DMX	Humboldt, Wright	13 min
May 26, 4:23 PM CDT	Special Weather Statement	DMX	Mahaska	22 min
May 26, 5:16 PM CDT	Tornado Warning	DMX	Franklin, Wright	29 min
May 26, 6:09 PM CDT	Special Weather Statement	DMX	Cerro Gordo, Worth	51 min
May 26, 6:30 PM CDT	Severe Thunderstorm Warning	DMX	Worth	30 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.