Alert archive / Iowa / Tornado Warnings in 2020

Tornado Warning 12, NWS Des Moines, IA

May 26, 2020Humboldt County, Wright County, Iowa

NWS Des Moines, IA issued this tornado warning at May 26, 2020, 3:47 PM CDT for Humboldt County, Wright County, Iowa. It was in force for 13 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, 3:47 PM CDT (20:47 UTC)
Expired: May 26, 2020, 4:00 PM CDT
In force: 13 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Humboldt County, IA, Wright County, IA

The radar

The Des Moines radar (KDMX), 107 km from the middle of the area, began a volume at 20:49 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

Minneapolis, MN (KMPX), launched 12:00Z, 8.8 hours before the alert went out and 243 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: 690 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 121 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

371 
WFUS53 KDMX 262047
TORDMX
IAC091-197-262115-
/O.NEW.KDMX.TO.W.0012.200526T2047Z-200526T2115Z/

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

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southwestern Wright County in north central Iowa...
  East central Humboldt County in north central Iowa...

* Until 415 PM CDT.
    
* At 347 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Eagle Grove, or 11 miles northwest of Webster
  City, 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 dangerous storm will be near...
  Eagle Grove around 400 PM CDT.

Other locations impacted by this tornadic thunderstorm include Eagle
Grove Municipal Airport, Hardy, Goldfield, Sportsman Park and
Renwick.

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 4259 9388 4259 9393 4282 9409 4282 9389
TIME...MOT...LOC 2047Z 171DEG 18KT 4262 9392 

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

$$

Martin

1 follow-up statement

956 
WWUS53 KDMX 262100
SVSDMX

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

IAC091-197-262110-
/O.CAN.KDMX.TO.W.0012.000000T0000Z-200526T2115Z/
Wright IA-Humboldt IA-
400 PM CDT Tue May 26 2020

...THE TORNADO WARNING FOR SOUTHWESTERN WRIGHT AND EAST CENTRAL
HUMBOLDT 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.

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

LAT...LON 4259 9388 4259 9393 4282 9409 4282 9389
TIME...MOT...LOC 2056Z 171DEG 18KT 4269 9393 

$$

Martin

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, 3:57 PM CDT	Tornado Warning	DMX	Audubon, Guthrie	21 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.