Alert archive / Iowa / Tornado Warnings in 2018

Tornado Warning 3, NWS Des Moines, IA

May 3, 2018Adair County, Guthrie County, Iowa

NWS Des Moines, IA issued this tornado warning at May 3, 2018, 5:12 PM CDT for Adair County, Guthrie County, Iowa. It was in force for 33 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 3, 2018, 5:12 PM CDT (22:12 UTC)
Expired: May 3, 2018, 5:45 PM CDT
In force: 33 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Adair County, IA, Guthrie County, IA

The radar

The Des Moines radar (KDMX), 68 km from the middle of the area, began a volume at 22:13 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 3, 5:30 PM CDT	FUNNEL CLOUD	4 Nnw Casey, IA	SPOTTER SITUATED JUST N OF MENLO NOTED FUNNEL CLOUD TO THE WNW. LOCATION APPROXIMATE AT THE TIME.

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 3, 2:57 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 10.2 hours before the alert went out and 157 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: 511 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

517 
WFUS53 KDMX 032212
TORDMX
IAC001-077-032245-
/O.NEW.KDMX.TO.W.0003.180503T2212Z-180503T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
512 PM CDT THU MAY 3 2018

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Guthrie County in west central Iowa...
  Northwestern Adair County in southwestern Iowa...

* Until 545 PM CDT.

* At 512 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 12 miles southwest of Guthrie Center, moving northeast
  at 30 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...
  Guthrie Center around 535 PM CDT. 
  Panora and Lake Panorama around 545 PM CDT. 

Other locations impacted by this tornadic thunderstorm include Casey
and Adair.

This includes Interstate 80 between mile markers 73 and 82.
 
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 4180 9458 4170 9428 4167 9428 4142 9461
      4147 9470 4150 9470
TIME...MOT...LOC 2212Z 216DEG 28KT 4151 9459 

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

$$

Donavon

1 follow-up statement

182 
WWUS53 KDMX 032228
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
528 PM CDT THU MAY 3 2018

IAC001-032237-
/O.CAN.KDMX.TO.W.0003.000000T0000Z-180503T2245Z/
Adair IA-
528 PM CDT THU MAY 3 2018

...THE TORNADO WARNING FOR NORTHWESTERN ADAIR COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area. Therefore, the warning has been cancelled.

A severe thunderstorm watch remains in effect until 800 PM CDT for
west central Iowa.

LAT...LON 4177 9459 4170 9433 4153 9452 4157 9467
TIME...MOT...LOC 2227Z 211DEG 26KT 4161 9454 

$$

IAC077-032245-
/O.CON.KDMX.TO.W.0003.000000T0000Z-180503T2245Z/
Guthrie IA-
528 PM CDT THU MAY 3 2018

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 545 PM CDT FOR CENTRAL
GUTHRIE COUNTY...
    
At 527 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Guthrie Center, moving northeast at 30 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. 

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 4177 9459 4170 9433 4153 9452 4157 9467
TIME...MOT...LOC 2227Z 211DEG 26KT 4161 9454 

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

$$

Donavon

The office that day

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

Issued	Product	Office	Counties	Lasted
May 2, 7:47 PM CDT	Flash Flood Warning	DMX	Adams, Ringgold, Taylor, Union	6 hr
May 2, 8:05 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Taylor	40 min
May 2, 8:43 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Ringgold, Taylor, Union	47 min
May 2, 9:43 PM CDT	Special Weather Statement	DMX	Wayne	47 min
May 2, 11:14 PM CDT	River Flood Warning	DMX	Taylor	49 min
May 2, 11:33 PM CDT	Severe Thunderstorm Warning	DMX	Appanoose, Davis, Monroe, Wapello	29 min
May 3, 12:00 PM CDT	Special Weather Statement	DMX	Greene	30 min
May 3, 2:24 PM CDT	River Flood Watch	DMX	Black Hawk	6 days
May 3, 5:26 PM CDT	Tornado Warning	DMX	Dallas, Madison, Polk	34 min
May 3, 5:39 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Polk, Warren	25 min
May 3, 5:43 PM CDT	Tornado Warning	DMX	Boone, Dallas, Polk, Story	21 min
May 3, 5:45 PM CDT	Tornado Warning	DMX	Dallas, Guthrie	30 min
May 3, 5:48 PM CDT	Tornado Warning	DMX	Adair, Madison	17 min
May 3, 6:23 PM CDT	Special Weather Statement	DMX	Union	37 min
May 3, 6:25 PM CDT	Severe Thunderstorm Warning	DMX	Hamilton, Webster, Wright	50 min
May 3, 6:51 PM CDT	Special Weather Statement	DMX	Clarke, Warren	39 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.