Alert archive / South Dakota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 28, NWS Sioux Falls, SD

April 9, 20114 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 9, 2011, 8:45 PM CDT for 4 counties in South Dakota. It was in force for 45 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 9, 2011, 8:45 PM CDT (01:45 UTC)
Expired: Apr 9, 2011, 9:30 PM CDT
In force: 45 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, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 40 km from the middle of the area, began a volume at 01:46 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, 8:46 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, 1.8 hours before the alert went out and 158 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.

980 
WUUS53 KFSD 100145
SVRFSD
SDC079-087-099-101-100230-
/O.NEW.KFSD.SV.W.0028.110410T0145Z-110410T0230Z/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LAKE COUNTY IN EAST CENTRAL SOUTH DAKOTA...
  EASTERN MCCOOK COUNTY IN SOUTHEAST SOUTH DAKOTA...
  NORTHWESTERN MINNEHAHA COUNTY IN SOUTHEAST SOUTH DAKOTA...
  SOUTHWESTERN MOODY COUNTY IN EAST CENTRAL SOUTH DAKOTA...

* UNTIL 930 PM CDT

* AT 846 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
  HAIL.  THIS STORM WAS LOCATED NEAR CANISTOTA...OR 21 MILES
  NORTHWEST OF PARKER...AND MOVING EAST AT 45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MONTROSE AROUND 855 PM CDT...
  HUMBOLDT...ORLAND AND LAKE HERMAN STATE PARK AROUND 900 PM CDT...
  MADISON AROUND 905 PM CDT...
  COLTON AROUND 910 PM CDT...
  CHESTER AND WENTWORTH AROUND 915 PM CDT...
  BALTIC AROUND 925 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.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN SIOUX FALLS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT SUNDAY MORNING FOR
NORTHWEST IOWA AND SOUTHWEST MINNESOTA AND NORTHEAST NEBRASKA AND
SOUTHEASTERN SOUTH DAKOTA.

LAT...LON 4383 9739 4410 9706 4406 9690 4392 9679
      4370 9669 4360 9705 4355 9738 4372 9746
TIME...MOT...LOC 0146Z 250DEG 38KT 4367 9727
WIND...HAIL <58MPH 1.00IN

$$

LIEBL

3 follow-up statements

917 
WWUS53 KFSD 100159
SVSFSD

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

SDC079-087-099-101-100230-
/O.CON.KFSD.SV.W.0028.000000T0000Z-110410T0230Z/
MOODY SD-LAKE SD-MINNEHAHA SD-MCCOOK SD-
859 PM CDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
MCCOOK...NORTHWESTERN MINNEHAHA...SOUTHERN LAKE AND SOUTHWESTERN
MOODY COUNTIES UNTIL 930 PM CDT...

AT 857 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
MONTROSE...OR 20 MILES NORTH OF PARKER...MOVING NORTHEAST AT 35 MPH.

IN ADDITION...AT 850 PM CDT, HAIL TO THE SIZE OF HALF DOLLARS WAS 
REPORTED 5 MILES NORTHEAST OF SALEM WITH THIS STORM.

THE STRONGEST PART OF THIS SEVERE THUNDERSTORM WILL BE NEAR...
  ORLAND AROUND 905 PM CDT...
  LAKE HERMAN STATE PARK AROUND 915 PM CDT...
  COLTON AND MADISON AROUND 920 PM CDT...
  CHESTER AND WENTWORTH AROUND 925 PM CDT...
  BALTIC AROUND 930 PM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

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.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN SIOUX FALLS.

&&

LAT...LON 4358 9718 4377 9732 4386 9734 4410 9706
      4406 9690 4392 9679 4370 9669 4360 9705
TIME...MOT...LOC 0157Z 240DEG 30KT 4370 9716
WIND...HAIL 60MPH 1.00IN

$$

LIEBL

988 
WWUS53 KFSD 100219 RRA
SVSFSD

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

SDC087-100230-
/O.CAN.KFSD.SV.W.0028.000000T0000Z-110410T0230Z/
MCCOOK SD-
919 PM CDT SAT APR 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MCCOOK COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN SIOUX FALLS.

LAT...LON 4367 9681 4373 9698 4386 9707 4410 9706
      4406 9690 4392 9679 4370 9669
TIME...MOT...LOC 0220Z 250DEG 53KT 4384 9670

$$

SDC079-099-101-100230-
/O.CON.KFSD.SV.W.0028.000000T0000Z-110410T0230Z/
MOODY SD-LAKE SD-MINNEHAHA SD-
919 PM CDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTH CENTRAL
MINNEHAHA...SOUTHEASTERN LAKE AND SOUTHWESTERN MOODY COUNTIES UNTIL
930 PM CDT...

AT 920 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
DELL RAPIDS...OR 20 MILES NORTH OF SIOUX FALLS...MOVING EAST AT 60
MPH.

THIS SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF NORTH
CENTRAL MINNEHAHA...SOUTHEASTERN LAKE AND SOUTHWESTERN MOODY
COUNTIES.

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.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN SIOUX FALLS.

&&

LAT...LON 4367 9681 4373 9698 4386 9707 4410 9706
      4406 9690 4392 9679 4370 9669
TIME...MOT...LOC 0220Z 250DEG 53KT 4384 9670
WIND...HAIL 60MPH 1.25IN

$$

LIEBL

269 
WWUS53 KFSD 100230
SVSFSD

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

SDC079-099-101-100240-
/O.EXP.KFSD.SV.W.0028.000000T0000Z-110410T0230Z/
MOODY SD-LAKE SD-MINNEHAHA SD-
930 PM CDT SAT APR 9 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MINNEHAHA...
SOUTHEASTERN LAKE AND SOUTHWESTERN MOODY COUNTIES HAS EXPIRED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN SIOUX FALLS.

LAT...LON 4367 9681 4373 9698 4386 9707 4410 9706
      4406 9690 4392 9679 4370 9669
TIME...MOT...LOC 0219Z 250DEG 53KT 4383 9672

$$

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, 8:11 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner, Minnehaha	34 min
Apr 9, 8:19 PM CDT	Severe Thunderstorm Warning	FSD	Union	41 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.