Alert archive / Iowa / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 5, NWS Sioux Falls, SD

April 24, 20164 counties in Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 24, 2016, 8:45 PM CDT for 4 counties in Iowa. It was in force for 18 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: Apr 24, 2016, 8:45 PM CDT (01:45 UTC)
Expired: Apr 24, 2016, 9:03 PM CDT
In force: 18 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clay County, IA, Dickinson County, IA, O'Brien County, IA, Osceola County, IA

The radar

The Sioux Falls radar (KFSD), 106 km from the middle of the area, began a volume at 01:45 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
Apr 24, 2:28 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.8 hours before the alert went out and 226 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: 1046 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 1404 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 338 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 16.1

Open this sounding in Storm Lab

The text

As transmitted.

211 
WUUS53 KFSD 250145
SVRFSD
IAC041-059-141-143-250230-
/O.NEW.KFSD.SV.W.0005.160425T0145Z-160425T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
845 PM CDT SUN APR 24 2016

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN OSCEOLA COUNTY IN NORTHWESTERN IOWA...
  O'BRIEN COUNTY IN NORTHWESTERN IOWA...
  NORTHWESTERN CLAY COUNTY IN NORTHWESTERN IOWA...
  WESTERN DICKINSON COUNTY IN NORTHWESTERN IOWA...

* UNTIL 930 PM CDT

* AT 845 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ARCHER...OR
  NEAR SHELDON...MOVING NORTHEAST AT 45 MPH.

  HAZARD...60 MPH WIND GUSTS. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING...AND TREES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  SANBORN AROUND 855 PM CDT. 
  HARTLEY AROUND 900 PM CDT. 
  MELVIN AROUND 905 PM CDT. 
  OCHEYEDAN AROUND 915 PM CDT. 
  HARRIS AROUND 920 PM CDT. 
  LAKE PARK AROUND 925 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

&&

LAT...LON 4333 9511 4291 9582 4291 9585 4327 9586
      4350 9542 4350 9535
TIME...MOT...LOC 0145Z 222DEG 40KT 4311 9575 

HAIL...<.75IN
WIND...60MPH
 
$$

MJF

1 follow-up statement

335 
WWUS53 KFSD 250203
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
903 PM CDT SUN APR 24 2016

IAC041-059-141-143-250212-
/O.CAN.KFSD.SV.W.0005.000000T0000Z-160425T0230Z/
OSCEOLA IA-O'BRIEN IA-CLAY IA-DICKINSON IA-
903 PM CDT SUN APR 24 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OSCEOLA...
O'BRIEN...NORTHWESTERN CLAY AND WESTERN DICKINSON COUNTIES IS
CANCELLED...
                
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSE AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING HAS BEEN CANCELLED.  HOWEVER GUSTY WINDS ARE
STILL POSSIBLE WITH THIS THUNDERSTORM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT FOR
NORTHWESTERN IOWA.

LAT...LON 4333 9511 4291 9582 4291 9585 4327 9586
      4350 9542 4350 9535
TIME...MOT...LOC 0200Z 222DEG 40KT 4326 9557 

$$

MJF

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 9:39 AM CDT	River Flood Warning	FSD	Clay	25 days
Apr 25, 9:39 AM CDT	River Flood Warning	FSD	Buena Vista, Clay	27 days

Nearby

Severe Thunderstorm Warnings in Iowa, 2016 Every severe thunderstorm warning in 2016

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.