Alert archive / Iowa / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 7, NWS Sioux Falls, SD

April 15, 20174 counties in Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 15, 2017, 8:09 PM CDT for 4 counties in Iowa. It was in force for 51 min. 3 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
Apr 15, 2017, 8:09 PM CDT (01:09 UTC)
Expired
Apr 15, 2017, 9:00 PM CDT
In force
51 min
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Hail
2.0 in
Wind
60.0 mph

Counties Cherokee County, IA, Ida County, IA, Plymouth County, IA, Woodbury County, IA

The radar

The Sioux Falls radar (KFSD), 132 km from the middle of the area, began a volume at 01:10 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

TimeReportWhereRemark
Apr 15, 8:10 PM CDTHAIL 1.25Hinton, IANUMEROUS REPORTS OF LARGE HAIL BETWEEN WESTFIELD AND SOUTHEAST OF HINTON IN PAST HALF HOUR. LOTS OF BROKEN WINDOWS IN HOUSES AND CARS. LARGEST HAIL WAS IN HINTON, WITH HALF DOLLAR SIZE HAIL OBSERVED.
Apr 15, 8:10 PM CDTHAIL 2.751 S Hinton, IALAW ENFORCEMENT AND SOCIAL MEDIA PHOTOS CONFIRMED HEN EGG TO BASEBALL SIZED HAIL JUST SOUTH OF HINTON.
Apr 15, 8:24 PM CDTHAIL 26 Ese Hinton, IA

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

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 145 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2017-04-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1034 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2017-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1034 J/kg
Mixed-layer CIN
-55 J/kg
Mixed-layer LCL
1322 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.8

Open this sounding in Storm Lab

The text

As transmitted.

578 
WUUS53 KFSD 160109
SVRFSD
IAC035-093-149-193-160200-
/O.NEW.KFSD.SV.W.0007.170416T0109Z-170416T0200Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
809 PM CDT SAT APR 15 2017

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southern Cherokee County in northwestern Iowa...
  Northeastern Woodbury County in west central Iowa...
  Southeastern Plymouth County in northwestern Iowa...
  Western Ida County in west central Iowa...

* Until 900 PM CDT

* At 809 PM CDT, a severe thunderstorm was located near Hinton, or 11
  miles south of Le Mars, moving east at 55 mph.

  HAZARD...Two inch hail and 60 mph wind gusts. 

  SOURCE...Trained weather spotters. At 806 PM CDT Golf ball sized 
           hail was reported in Hinton.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees. 

* This severe thunderstorm will be near, 
  Moville and Kingsley around 820 PM CDT. 
  Pierson around 830 PM CDT. 
  Correctionville and Washta around 835 PM CDT. 
  Quimby and Cushing around 840 PM CDT. 
  Holstein around 845 PM CDT. 
  Galva around 855 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!

&&

LAT...LON 4258 9640 4275 9625 4264 9539 4262 9539
      4227 9549
TIME...MOT...LOC 0109Z 282DEG 49KT 4262 9621 

HAIL...2.00IN
WIND...60MPH
 
$$

Hanko
2 follow-up statements
455 
WWUS53 KFSD 160128
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
828 PM CDT SAT APR 15 2017

IAC035-093-149-193-160200-
/O.CON.KFSD.SV.W.0007.000000T0000Z-170416T0200Z/
Cherokee IA-Woodbury IA-Plymouth IA-Ida IA-
828 PM CDT SAT APR 15 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR SOUTHERN CHEROKEE...NORTHEASTERN WOODBURY...SOUTHEASTERN PLYMOUTH
AND WESTERN IDA COUNTIES...

At 825 PM CDT, a severe thunderstorm was located near Moville, or 15
miles east of Sioux City, moving east at 35 mph.

HAZARD...Two inch hail and 60 mph wind gusts. 

SOURCE...Trained weather spotters. At 824 PM CDT Hen egg sized hail 
         was reported southeast of Hinton. 

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees. 

This severe storm will be near...
  Kingsley around 835 PM CDT. 
  Pierson around 845 PM CDT. 
  Correctionville and Washta around 855 PM CDT. 
  Cushing around 900 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4254 9627 4270 9614 4262 9539 4227 9549
TIME...MOT...LOC 0125Z 289DEG 31KT 4256 9609 

HAIL...2.00IN
WIND...60MPH
 
$$

Hanko
884 
WWUS53 KFSD 160142
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
842 PM CDT SAT APR 15 2017

IAC035-149-160152-
/O.CAN.KFSD.SV.W.0007.000000T0000Z-170416T0200Z/
Cherokee IA-Plymouth IA-
842 PM CDT SAT APR 15 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CHEROKEE AND
SOUTHEASTERN PLYMOUTH COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4248 9610 4256 9604 4254 9541 4227 9549
TIME...MOT...LOC 0142Z 294DEG 30KT 4249 9599 

$$

IAC093-193-160200-
/O.CON.KFSD.SV.W.0007.000000T0000Z-170416T0200Z/
Woodbury IA-Ida IA-
842 PM CDT SAT APR 15 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR NORTHEASTERN WOODBURY AND CENTRAL IDA COUNTIES...

At 842 PM CDT, a severe thunderstorm was located near Moville, or 20
miles east of Sioux City, moving southeast at 35 mph.

HAZARD...60 mph wind gusts and half dollar size hail. 

SOURCE...Radar indicated. 

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees. 

This severe storm will be near...
  Pierson around 850 PM CDT. 
  Correctionville and Cushing around 900 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4248 9610 4256 9604 4254 9541 4227 9549
TIME...MOT...LOC 0142Z 294DEG 30KT 4249 9599 

HAIL...1.25IN
WIND...60MPH
 
$$

Hanko

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 15, 7:00 PM CDTSevere Thunderstorm WarningFSDPlymouth45 min
Apr 15, 7:36 PM CDTSevere Thunderstorm WarningFSDPlymouth39 min
Apr 15, 8:52 PM CDTSevere Thunderstorm WarningFSDIda, Woodbury24 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2017Every 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.