Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 32, NWS Des Moines, IA

June 25, 2018Decatur County, Ringgold County, Iowa

NWS Des Moines, IA issued this tornado warning at Jun 25, 2018, 5:58 PM CDT for Decatur County, Ringgold County, Iowa. It was in force for 32 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: Jun 25, 2018, 5:58 PM CDT (22:58 UTC)
Expired: Jun 25, 2018, 6:30 PM CDT
In force: 32 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Decatur County, IA, Ringgold County, IA

The radar

The Des Moines radar (KDMX), 117 km from the middle of the area, began a volume at 22:57 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
Jun 25, 5:40 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.0 hours before the alert went out and 203 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: 118 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 796 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -89 m²/s²
0-3 km storm-relative helicity: -80 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

530 
WFUS53 KDMX 252258
TORDMX
IAC053-159-252330-
/O.NEW.KDMX.TO.W.0032.180625T2258Z-180625T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
558 PM CDT MON JUN 25 2018

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  West central Decatur County in south central Iowa...
  East central Ringgold County in south central Iowa...

* Until 630 PM CDT.
    
* At 558 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Mount Ayr, moving northeast 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
  west central Decatur and east central Ringgold Counties, including
  the following locations... Kellerton and Beaconsfield.

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 4066 9413 4070 9420 4085 9405 4073 9393
TIME...MOT...LOC 2258Z 228DEG 17KT 4070 9413 

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

$$

Lee

2 follow-up statements

636 
WWUS53 KDMX 252312
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
612 PM CDT MON JUN 25 2018

IAC053-159-252330-
/O.CON.KDMX.TO.W.0032.000000T0000Z-180625T2330Z/
Decatur IA-Ringgold IA-
612 PM CDT MON JUN 25 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR WEST
CENTRAL DECATUR AND EAST CENTRAL RINGGOLD COUNTIES...
    
At 612 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Sun Valley Lake, or 9 miles northeast of Mount Ayr,
moving northeast at 25 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.

Locations impacted include...
Beaconsfield.

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 4072 9411 4074 9416 4085 9405 4079 9399
TIME...MOT...LOC 2312Z 217DEG 20KT 4077 9408 

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

$$

Lee

796 
WWUS53 KDMX 252328
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
628 PM CDT MON JUN 25 2018

IAC053-159-252337-
/O.EXP.KDMX.TO.W.0032.000000T0000Z-180625T2330Z/
Decatur IA-Ringgold IA-
628 PM CDT MON JUN 25 2018

...THE TORNADO WARNING FOR WEST CENTRAL DECATUR AND EAST CENTRAL
RINGGOLD COUNTIES WILL EXPIRE AT 630 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.

A Tornado Watch remains in effect until 900 PM CDT for south central
Iowa.

LAT...LON 4072 9411 4074 9416 4085 9405 4079 9399
TIME...MOT...LOC 2327Z 228DEG 17KT 4082 9401 

$$

Lee

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 24, 8:46 PM CDT	Flash Flood Warning	DMX	Kossuth	4 hr
Jun 24, 9:43 PM CDT	River Flood Watch	DMX	Boone, Hamilton, Webster	37 hr
Jun 24, 9:46 PM CDT	Flash Flood Warning	DMX	Hancock, Wright	6 hr
Jun 25, 12:24 AM CDT	Flash Flood Warning	DMX	Hancock	7 hr
Jun 25, 12:47 AM CDT	Areal Flood Warning	DMX	Kossuth	9 hr
Jun 25, 1:08 PM CDT	Flash Flood Watch	DMX	Calhoun, Carroll, Cerro Gordo, Crawford, Emmet, Greene and 10 more	14 hr
Jun 25, 4:56 PM CDT	Tornado Warning Tornado observed	DMX	Ringgold	34 min
Jun 25, 5:19 PM CDT	Tornado Warning Tornado observed	DMX	Ringgold	26 min
Jun 25, 5:21 PM CDT	Tornado Warning	DMX	Ringgold, Union	24 min
Jun 25, 5:26 PM CDT	Tornado Warning	DMX	Ringgold	34 min
Jun 25, 6:47 PM CDT	Tornado Warning	DMX	Madison	28 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.