Alert archive / Iowa / Tornado Warnings in 2019

Tornado Warning 8, NWS Des Moines, IA

May 29, 2019Poweshiek County, Iowa

NWS Des Moines, IA issued this tornado warning at May 29, 2019, 7:28 PM CDT for Poweshiek County, Iowa. It was in force for 17 min. 2 reports 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 29, 2019, 7:28 PM CDT (00:28 UTC)
Expired: May 29, 2019, 7:45 PM CDT
In force: 17 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Poweshiek County, IA

The radar

The Des Moines radar (KDMX), 116 km from the middle of the area, began a volume at 00:27 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 29, 7:28 PM CDT	TORNADO	1 Ene Deep River, IA	TORNADO HAD LIFTED, NOW BACK ON THE GROUND.
May 29, 7:39 PM CDT	TORNADO	1 Ese Guernsey, IA	REPORTED STILL ON THE GROUND TOWARD 470TH ST.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.5 hours before the alert went out and 153 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: 614 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 778 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 167 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.3

Open this sounding in Storm Lab

The text

As transmitted.

658 
WFUS53 KDMX 300028
TORDMX
IAC157-300100-
/O.NEW.KDMX.TO.W.0008.190530T0028Z-190530T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Des Moines IA
728 PM CDT Wed May 29 2019

The National Weather Service in Des Moines  has issued a

* Tornado Warning for...
  Southeastern Poweshiek County in central Iowa...

* Until 800 PM CDT.
    
* At 728 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles east of Montezuma, moving northeast at 15 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation. Law enforcement continued to 
           indicate a rotating wall cloud near Deep River at 726pm.

  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
  southeastern Poweshiek County, including the following locations...
  Deep River and Guernsey.

This includes Interstate 80 near mile marker 204.
 
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.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .

&&

LAT...LON 4153 9236 4162 9240 4171 9230 4155 9230
TIME...MOT...LOC 0028Z 231DEG 11KT 4159 9235 

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

$$

Ansorge

2 follow-up statements

866 
WWUS53 KDMX 300030
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
730 PM CDT Wed May 29 2019

IAC157-300100-
/O.CON.KDMX.TO.W.0008.000000T0000Z-190530T0100Z/
Poweshiek IA-
730 PM CDT Wed May 29 2019

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR
SOUTHEASTERN POWESHIEK COUNTY...
    
At 729 PM CDT, a confirmed tornado was located 9 miles east of
Montezuma, moving northeast at 15 mph.

HAZARD...Damaging tornado.

SOURCE...Law enforcement confirmed a tornado again at 730pm 
         just northeast of Deep River crossing Highway 21.

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...
Deep River and Guernsey. 

This includes Interstate 80 near mile marker 204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 4153 9236 4162 9240 4171 9230 4155 9230
TIME...MOT...LOC 0029Z 231DEG 11KT 4159 9235 

TORNADO...OBSERVED
HAIL...0.00IN

$$

Ansorge

829 
WWUS53 KDMX 300045
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
745 PM CDT Wed May 29 2019

IAC157-300055-
/O.CAN.KDMX.TO.W.0008.000000T0000Z-190530T0100Z/
Poweshiek IA-
745 PM CDT Wed May 29 2019

...THE TORNADO WARNING FOR SOUTHEASTERN POWESHIEK COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area and 
into Iowa County. Therefore, the warning has been cancelled for 
Poweshiek County.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Des Moines .

LAT...LON 4153 9236 4162 9240 4171 9230 4155 9230
TIME...MOT...LOC 0043Z 231DEG 11KT 4162 9230 

$$

Ansorge

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 7:06 PM CDT	Tornado Warning Tornado observed	DMX	Poweshiek	24 min
May 29, 7:45 PM CDT	Tornado Warning	DMX	Wright	30 min
May 29, 7:48 PM CDT	Tornado Warning Tornado observed	DMX	Hardin	27 min
May 29, 7:53 PM CDT	Tornado Warning	DMX	Grundy, Hardin, Marshall	37 min
May 29, 8:02 PM CDT	Tornado Warning	DMX	Cerro Gordo, Franklin, Hancock, Wright	28 min
May 29, 8:20 PM CDT	Tornado Warning	DMX	Grundy, Hardin	40 min
May 29, 8:29 PM CDT	Tornado Warning	DMX	Hardin	16 min
May 29, 8:42 PM CDT	Tornado Warning Tornado observed	DMX	Franklin, Grundy, Hardin	48 min
May 29, 9:13 PM CDT	Tornado Warning Tornado observed	DMX	Butler, Franklin	32 min
May 29, 10:22 PM CDT	Special Weather Statement	DMX	Bremer	53 min
May 29, 10:30 PM CDT	Severe Thunderstorm Warning	DMX	Bremer	30 min

Nearby

Tornado Warnings in Iowa, 2019 Every tornado warning in 2019 Tornadoes in 2019

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.