Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 2, NWS Des Moines, IA

May 2, 2018Ringgold County, Iowa

NWS Des Moines, IA issued this tornado warning at May 2, 2018, 6:28 PM CDT for Ringgold County, Iowa. It was in force for 17 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: May 2, 2018, 6:28 PM CDT (23:28 UTC)
Expired: May 2, 2018, 6:45 PM CDT
In force: 17 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Ringgold County, IA

The radar

The Des Moines radar (KDMX), 110 km from the middle of the area, began a volume at 23:32 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 2, 6:51 PM CDT	HAIL 1	Tingley, IA

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 2, 5:27 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 188 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: 483 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

583 
WFUS53 KDMX 022328
TORDMX
IAC159-030000-
/O.NEW.KDMX.TO.W.0002.180502T2328Z-180503T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
628 PM CDT WED MAY 2 2018

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Northern Ringgold County in south central Iowa...

* Until 700 PM CDT.

* At 628 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 8 miles north of Mount Ayr, moving east at 10 mph.

  HAZARD...Tornado and quarter size hail. 

  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...
  Sun Valley Lake around 700 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Shannon City, Ellston, Tingley, Beaconsfield, Diagonal and Kellerton.

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 4079 9438 4090 9434 4090 9401 4071 9402
TIME...MOT...LOC 2328Z 276DEG 9KT 4083 9429 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

Donavon

1 follow-up statement

728 
WWUS53 KDMX 022345
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
645 PM CDT WED MAY 2 2018

IAC159-022354-
/O.CAN.KDMX.TO.W.0002.000000T0000Z-180503T0000Z/
Ringgold IA-
645 PM CDT WED MAY 2 2018

...THE TORNADO WARNING FOR NORTHERN RINGGOLD COUNTY IS CANCELLED...
                
The storm which prompted the warning no longer appears capable of 
producing a tornado. Therefore the warning has been cancelled.

A tornado watch remains in effect until 100 AM CDT for south central
Iowa.

LAT...LON 4079 9438 4090 9434 4090 9401 4071 9402
TIME...MOT...LOC 2343Z 276DEG 9KT 4083 9424 

$$

Donavon

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 7:47 PM CDT	Severe Thunderstorm Warning	DMX	Audubon, Cass, Guthrie	43 min
May 1, 8:17 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Guthrie	43 min
May 1, 9:41 PM CDT	Special Weather Statement	DMX	Butler, Grundy, Hardin, Marshall, Tama	49 min
May 1, 10:44 PM CDT	Special Weather Statement	DMX	Marshall, Tama	31 min
May 2, 2:53 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Humboldt, Pocahontas, Webster	41 min
May 2, 3:40 PM CDT	Special Weather Statement	DMX	Butler, Cerro Gordo, Franklin, Wright	65 min
May 2, 4:31 PM CDT	Special Weather Statement	DMX	Bremer, Butler	44 min
May 2, 5:32 PM CDT	Severe Thunderstorm Warning	DMX	Adams, Taylor	43 min
May 2, 6:15 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Taylor, Union	45 min
May 2, 6:24 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Union	51 min

Nearby

Tornado Warnings in Iowa, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.