Alert archive / Iowa / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 9, NWS Sioux Falls, SD

April 13, 2018Osceola County, Iowa; Nobles County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 13, 2018, 6:19 PM CDT for Osceola County, Iowa; Nobles County, Minnesota. It was in force for 26 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 13, 2018, 6:19 PM CDT (23:19 UTC)
Expired: Apr 13, 2018, 6:45 PM CDT
In force: 26 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Osceola County, IA, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 91 km from the middle of the area, began a volume at 23:22 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 13, 6:25 PM CDT	HAIL 1	3 Ne Bigelow, MN

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.3 hours before the alert went out and 214 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 723 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -62 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

533 
WUUS53 KFSD 132319
SVRFSD
IAC143-MNC105-132345-
/O.NEW.KFSD.SV.W.0009.180413T2319Z-180413T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
619 PM CDT FRI APR 13 2018

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  North central Osceola County in northwestern Iowa...
  Southeastern Nobles County in southwestern Minnesota...

* Until 645 PM CDT

* At 619 PM CDT, a severe thunderstorm was located 7 miles northwest
  of Ocheyedan, or 8 miles northeast of Sibley, moving north at 40
  mph.

  HAZARD...Quarter size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Damage to vehicles is expected. 

* This severe thunderstorm will be near, 
  Worthington around 635 PM CDT. 

Other locations impacted by this severe thunderstorm include Bigelow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4344 9554 4344 9571 4376 9577 4376 9546
TIME...MOT...LOC 2319Z 180DEG 36KT 4350 9563 

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

JM

1 follow-up statement

849 
WWUS53 KFSD 132341
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
641 PM CDT FRI APR 13 2018

IAC143-MNC105-132350-
/O.EXP.KFSD.SV.W.0009.000000T0000Z-180413T2345Z/
Osceola IA-Nobles MN-
641 PM CDT FRI APR 13 2018

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL OSCEOLA AND
SOUTHEASTERN NOBLES COUNTIES WILL EXPIRE AT 645 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.

LAT...LON 4344 9554 4344 9571 4376 9577 4376 9546
TIME...MOT...LOC 2340Z 180DEG 36KT 4370 9563 

$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 9:41 AM CDT	River Flood Warning	FSD	Plymouth, Sioux	59 hr
Apr 13, 9:41 AM CDT	River Flood Warning	FSD	Plymouth	3 days
Apr 13, 9:41 AM CDT	River Flood Warning	FSD	Lyon	3 days
Apr 13, 9:41 AM CDT	River Flood Warning	FSD	Clay	4 days
Apr 13, 9:41 AM CDT	River Flood Warning	FSD	Clay, Dickinson	63 hr
Apr 13, 9:41 AM CDT	River Flood Warning	FSD	Clay	25 days
Apr 13, 9:41 AM CDT	River Flood Warning	FSD	Buena Vista, Clay	43 days
Apr 13, 8:20 AM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Jackson, Murray, Nobles	40 min
Apr 13, 12:39 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Lyon	36 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2018 Severe Thunderstorm Warnings in Minnesota, 2018 Every severe thunderstorm warning in 2018

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.