Alert archive / Iowa / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 49, NWS Des Moines, IA

April 10, 2017Mahaska County, Marion County, Poweshiek County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 10, 2017, 12:43 AM CDT for Mahaska County, Marion County, Poweshiek County, Iowa. It was in force for 36 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: Apr 10, 2017, 12:43 AM CDT (05:43 UTC)
Expired: Apr 10, 2017, 1:19 AM CDT
In force: 36 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Mahaska County, IA, Marion County, IA, Poweshiek County, IA

The radar

The Des Moines radar (KDMX), 97 km from the middle of the area, began a volume at 05:43 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
Apr 10, 1:02 AM CDT	HAIL 1.25	New Sharon, IA	PUBLIC REPORT RELAYED VIA KCCI ON SOCIAL MEDIA.

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
Apr 9, 11:28 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 5.7 hours before the alert went out and 176 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: 443 J/kg
Mixed-layer CIN: -270 J/kg
Mixed-layer LCL: 1660 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

616 
WUUS53 KDMX 100543
SVRDMX
IAC123-125-157-100645-
/O.NEW.KDMX.SV.W.0049.170410T0543Z-170410T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1243 AM CDT MON APR 10 2017

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southern Poweshiek County in central Iowa...
  East central Marion County in south central Iowa...
  Northern Mahaska County in south central Iowa...

* Until 145 AM CDT.

* At 1243 AM CDT, a severe thunderstorm was located near Pella,
  moving northeast at 55 mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* Locations impacted include...
  Oskaloosa, Pella, Montezuma, Brooklyn, New Sharon, Lake Red Rock,
  Victor, Deep River, Harvey, Barnes City, Leighton, Searsboro,
  Hartwick, Guernsey and Pella Municipal Airport.

This includes Interstate 80 between mile markers 193 and 204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

&&

LAT...LON 4151 9241 4136 9241 4126 9288 4140 9300
      4151 9282 4151 9276 4155 9276 4183 9230
      4151 9230
TIME...MOT...LOC 0543Z 243DEG 49KT 4137 9288 

HAIL...1.00IN
WIND...<50MPH
 
$$

Curtis

3 follow-up statements

517 
WWUS53 KDMX 100550
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1250 AM CDT MON APR 10 2017

IAC125-100600-
/O.CAN.KDMX.SV.W.0049.000000T0000Z-170410T0645Z/
Marion IA-
1250 AM CDT MON APR 10 2017

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MARION COUNTY IS
CANCELLED...
    
The severe 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 600 AM CDT for
south central Iowa.

LAT...LON 4151 9241 4136 9241 4127 9282 4148 9286
      4151 9282 4151 9276 4155 9276 4183 9230
      4151 9230
TIME...MOT...LOC 0550Z 243DEG 49KT 4141 9276 

$$

IAC123-157-100645-
/O.CON.KDMX.SV.W.0049.000000T0000Z-170410T0645Z/
Poweshiek IA-Mahaska IA-
1250 AM CDT MON APR 10 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR SOUTHERN POWESHIEK AND NORTHERN MAHASKA COUNTIES...

At 1250 AM CDT, a severe thunderstorm was located 7 miles southwest
of New Sharon, or 7 miles east of Pella, moving northeast at 55 mph.

HAZARD...Quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Damage to vehicles is expected. 

Locations impacted include...
Oskaloosa, Montezuma, Brooklyn, New Sharon, Victor, Deep River,
Barnes City, Leighton, Searsboro, Hartwick and Guernsey.

This includes Interstate 80 between mile markers 193 and 204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4151 9241 4136 9241 4127 9282 4148 9286
      4151 9282 4151 9276 4155 9276 4183 9230
      4151 9230
TIME...MOT...LOC 0550Z 243DEG 49KT 4141 9276 

HAIL...1.00IN
WIND...<50MPH
 
$$

Curtis

276 
WWUS53 KDMX 100602
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
102 AM CDT MON APR 10 2017

IAC123-157-100645-
/O.CON.KDMX.SV.W.0049.000000T0000Z-170410T0645Z/
Poweshiek IA-Mahaska IA-
102 AM CDT MON APR 10 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR SOUTHERN POWESHIEK AND NORTHEASTERN MAHASKA COUNTIES...

At 101 AM CDT, a severe thunderstorm was located near New Sharon, or
7 miles south of Montezuma, moving northeast at 55 mph.

HAZARD...Quarter size hail. 

SOURCE...Radar indicated. 

IMPACT...Damage to vehicles is expected. 

Locations impacted include...
Montezuma, Brooklyn, New Sharon, Victor, Deep River, Barnes City,
Searsboro, Hartwick and Guernsey.

This includes Interstate 80 between mile markers 193 and 204.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4151 9241 4136 9241 4141 9264 4146 9272
      4156 9274 4183 9230 4151 9230
TIME...MOT...LOC 0601Z 243DEG 49KT 4148 9257 

HAIL...1.00IN
WIND...<50MPH
 
$$

Curtis

006 
WWUS53 KDMX 100619
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
119 AM CDT MON APR 10 2017

IAC123-157-100628-
/O.CAN.KDMX.SV.W.0049.000000T0000Z-170410T0645Z/
Poweshiek IA-Mahaska IA-
119 AM CDT MON APR 10 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN POWESHIEK AND
NORTHEASTERN MAHASKA COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

A severe thunderstorm watch remains in effect until 600 AM CDT for
south central Iowa.

LAT...LON 4151 9241 4136 9241 4141 9264 4146 9272
      4156 9274 4183 9230 4151 9230
TIME...MOT...LOC 0617Z 243DEG 49KT 4159 9228 

$$

Curtis

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 8:30 PM CDT	Severe Thunderstorm Warning	DMX	Hancock, Humboldt, Wright	45 min
Apr 9, 8:57 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Hancock, Worth	48 min
Apr 9, 9:51 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	9 min
Apr 9, 10:18 PM CDT	Special Weather Statement	DMX	Cerro Gordo	42 min
Apr 9, 10:25 PM CDT	Severe Thunderstorm Warning	DMX	Cerro Gordo, Worth	23 min
Apr 9, 10:57 PM CDT	Severe Thunderstorm Warning	DMX	Ringgold, Taylor, Union	48 min
Apr 9, 11:34 PM CDT	Severe Thunderstorm Warning	DMX	Clarke, Decatur, Madison, Ringgold, Union, Warren	29 min
Apr 10, 12:00 AM CDT	Severe Thunderstorm Warning	DMX	Clarke, Lucas, Marion, Warren	30 min
Apr 10, 12:22 AM CDT	Severe Thunderstorm Warning	DMX	Jasper, Lucas, Mahaska, Marion, Warren	23 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2017 Every severe thunderstorm warning in 2017

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.