Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 22, NWS Sioux Falls, SD

April 9, 20114 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 9, 2011, 8:11 PM CDT for 4 counties in South Dakota. It was in force for 34 min. 2 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 9, 2011, 8:11 PM CDT (01:11 UTC)
Expired: Apr 9, 2011, 8:45 PM CDT
In force: 34 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 58.0 mph

Counties Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 56 km from the middle of the area, began a volume at 01:13 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 9, 8:44 PM CDT	HAIL 1	3 S Salem, SD
Apr 9, 8:46 PM CDT	HAIL 1.5	3 S Salem, SD

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, 7:47 PM CDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.2 hours before the alert went out and 144 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: 672 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: -54 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

495 
WUUS53 KFSD 100111
SVRFSD
SDC079-087-097-099-100145-
/O.NEW.KFSD.SV.W.0022.110410T0111Z-110410T0145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
811 PM CDT SAT APR 9 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  NORTHERN MCCOOK COUNTY IN SOUTHEAST SOUTH DAKOTA...
  EASTERN MINER COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  NORTHWESTERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA...

* UNTIL 845 PM CDT

* AT 811 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL.  THIS STORM WAS LOCATED NEAR SALEM...OR 25 MILES SOUTHWEST OF
  MADISON...AND MOVING NORTHEAST AT 55 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  ORLAND...WINFRED AND HOWARD AROUND 825 PM CDT...
  LAKE HERMAN STATE PARK AROUND 830 PM CDT...
  MADISON AROUND 835 PM CDT...
  RAMONA AND WENTWORTH AROUND 840 PM CDT...
  NUNDA AROUND 845 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4371 9700 4362 9731 4361 9761 4380 9762
      4404 9759 4418 9751 4419 9690
TIME...MOT...LOC 0111Z 210DEG 50KT 4376 9742
WIND...HAIL <58MPH 1.00IN

$$

LIEBL

1 follow-up statement

354 
WWUS53 KFSD 100126
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
826 PM CDT SAT APR 9 2011

SDC079-087-097-099-100145-
/O.CON.KFSD.SV.W.0022.000000T0000Z-110410T0145Z/
MINER SD-LAKE SD-MINNEHAHA SD-MCCOOK SD-
826 PM CDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
MCCOOK...NORTHWESTERN MINNEHAHA...LAKE AND EASTERN MINER COUNTIES
UNTIL 845 PM CDT...

AT 827 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED NEAR SALEM...OR 22 MILES SOUTHWEST OF MADISON...
MOVING NORTHEAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  MONTROSE AROUND 835 PM CDT...
  WINFRED AROUND 840 PM CDT...
  ORLAND AROUND 845 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 4371 9700 4362 9731 4361 9761 4380 9762
      4404 9759 4418 9751 4419 9690
TIME...MOT...LOC 0127Z 234DEG 25KT 4376 9732
WIND...HAIL <58MPH 1.00IN

$$

LIEBL

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:16 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson	29 min
Apr 9, 7:38 PM CDT	Severe Thunderstorm Warning	FSD	Clay, Yankton	26 min
Apr 9, 7:42 PM CDT	Severe Thunderstorm Warning	FSD	Davison, Hanson, Hutchinson	33 min
Apr 9, 8:19 PM CDT	Severe Thunderstorm Warning	FSD	Union	41 min
Apr 9, 8:45 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Minnehaha, Moody	45 min
Apr 9, 8:55 PM CDT	Severe Thunderstorm Warning	FSD	Brookings, Lake, Moody	50 min
Apr 9, 9:15 PM CDT	Severe Thunderstorm Warning	FSD	Union	30 min
Apr 9, 9:17 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	43 min
Apr 9, 9:17 PM CDT	Severe Thunderstorm Warning	FSD	Union	43 min
Apr 9, 9:31 PM CDT	Tornado Warning	FSD	Union	29 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2011 Every severe thunderstorm warning in 2011

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.