Alert archive / Iowa / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 162, NWS Sioux Falls, SD

August 16, 20164 counties in Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 16, 2016, 9:22 PM CDT for 4 counties in Iowa. It was in force for 38 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: Aug 16, 2016, 9:22 PM CDT (02:22 UTC)
Expired: Aug 16, 2016, 10:00 PM CDT
In force: 38 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Cherokee County, IA, O'Brien County, IA, Plymouth County, IA, Sioux County, IA

The radar

The Sioux Falls radar (KFSD), 90 km from the middle of the area, began a volume at 02:24 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 2.4 hours before the alert went out and 189 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: 2247 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 10.5

Open this sounding in Storm Lab

The text

As transmitted.

935 
WUUS53 KFSD 170222
SVRFSD
IAC035-141-149-167-170300-
/O.NEW.KFSD.SV.W.0162.160817T0222Z-160817T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
922 PM CDT TUE AUG 16 2016

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN O'BRIEN COUNTY IN NORTHWESTERN IOWA...
  SOUTHEASTERN SIOUX COUNTY IN NORTHWESTERN IOWA...
  NORTHEASTERN PLYMOUTH COUNTY IN NORTHWESTERN IOWA...
  NORTHWESTERN CHEROKEE COUNTY IN NORTHWESTERN IOWA...

* UNTIL 1000 PM CDT

* AT 922 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ALTON...OR
  OVER ORANGE CITY...MOVING SOUTHEAST AT 10 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 THUNDERSTORM WILL BE NEAR...
  HOSPERS AROUND 925 PM CDT. 
  ALTON AROUND 930 PM CDT. 
  GRANVILLE AROUND 950 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4307 9614 4312 9590 4294 9567 4278 9597
TIME...MOT...LOC 0222Z 320DEG 10KT 4302 9601 

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

BT

3 follow-up statements

661 
WWUS53 KFSD 170228
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
928 PM CDT TUE AUG 16 2016

IAC035-141-149-167-170300-
/O.CON.KFSD.SV.W.0162.000000T0000Z-160817T0300Z/
O'BRIEN IA-SIOUX IA-PLYMOUTH IA-CHEROKEE IA-
928 PM CDT TUE AUG 16 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR SOUTHWESTERN O'BRIEN...SOUTHEASTERN SIOUX...NORTHEASTERN PLYMOUTH
AND NORTHWESTERN CHEROKEE COUNTIES...

AT 928 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ALTON...OR
NEAR ORANGE CITY...MOVING SOUTHEAST AT 10 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...
  GRANVILLE AROUND 950 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4307 9614 4312 9590 4294 9567 4278 9597
TIME...MOT...LOC 0228Z 320DEG 10KT 4301 9600 

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

BT

043 
WWUS53 KFSD 170236
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
936 PM CDT TUE AUG 16 2016

IAC035-141-149-167-170300-
/O.CON.KFSD.SV.W.0162.000000T0000Z-160817T0300Z/
O'BRIEN IA-SIOUX IA-PLYMOUTH IA-CHEROKEE IA-
936 PM CDT TUE AUG 16 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM CDT
FOR SOUTHWESTERN O'BRIEN...SOUTHEASTERN SIOUX...NORTHEASTERN PLYMOUTH
AND NORTHWESTERN CHEROKEE COUNTIES...

AT 936 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER ALTON...OR
NEAR ORANGE CITY...MOVING SOUTHEAST AT 10 MPH.

HAZARD...60 MPH WIND GUSTS AND QUARTER 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...
  GRANVILLE AROUND 955 PM CDT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4307 9614 4312 9590 4294 9567 4278 9597
TIME...MOT...LOC 0236Z 320DEG 10KT 4299 9598 

HAIL...1.00IN
WIND...60MPH
 
$$

BT

304 
WWUS53 KFSD 170255
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
955 PM CDT TUE AUG 16 2016

IAC035-141-149-167-170305-
/O.EXP.KFSD.SV.W.0162.000000T0000Z-160817T0300Z/
O'BRIEN IA-SIOUX IA-PLYMOUTH IA-CHEROKEE IA-
955 PM CDT TUE AUG 16 2016

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN O'BRIEN...
SOUTHEASTERN SIOUX...NORTHEASTERN PLYMOUTH AND NORTHWESTERN CHEROKEE
COUNTIES WILL EXPIRE AT 1000 PM CDT...
                
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 WILL BE ALLOWED TO EXPIRE.  HOWEVER HEAVY RAIN
IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4307 9614 4312 9590 4294 9567 4278 9597
TIME...MOT...LOC 0253Z 320DEG 10KT 4299 9598 

$$

BT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 8:28 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Sioux	47 min
Aug 16, 9:10 PM CDT	Severe Thunderstorm Warning	FSD	Cherokee, O'Brien, Plymouth, Sioux	50 min

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.