Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 152, NWS Sioux Falls, SD

July 1, 2011Lyon County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 1, 2011, 4:13 PM CDT for Lyon County, Minnesota. It was in force for 32 min. 4 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: Jul 1, 2011, 4:13 PM CDT (21:13 UTC)
Expired: Jul 1, 2011, 4:45 PM CDT
In force: 32 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 80.0 mph

County Lyon County, MN

The radar

The Sioux Falls radar (KFSD), 139 km from the middle of the area, began a volume at 21:14 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
Jul 1, 4:25 PM CDT	TSTM WND DMG	Marshall, MN	12+ INCH TREES DOWN ALL ACROSS TOWN
Jul 1, 4:25 PM CDT	TSTM WND GST 80	Marshall, MN	70 TO 80 MILE AN HOUR THUNDERSTORM WINDS IN MARSHALL MINNESOTA. LOTS OF WIND RELATED DAMAGE.
Jul 1, 4:25 PM CDT	HAIL 1.5	Marshall, MN	POWER IS OUT IN MARSHALL WITH NUMEROUS TREES DOWN AND WINDOWS BLOWN OUT. THUNDERSTORM WINDS WERE ESTIMATED BETWEEN 65 AND 70 MILES AN HOUR.
Jul 1, 4:28 PM CDT	TSTM WND DMG	Marshall, MN	SEVERE WIND DAMAGE REPORTED IN MARSHALL MINNESOTA.

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
Jul 1, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.2 hours before the alert went out and 165 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: 3970 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1089 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 5 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

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

603 
WUUS53 KFSD 012113
SVRFSD
MNC083-012145-
/O.NEW.KFSD.SV.W.0152.110701T2113Z-110701T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
413 PM CDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN LYON COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 445 PM CDT

* AT 413 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR
  SIZE HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 80 MPH.  THIS STORM
  WAS LOCATED NEAR CAMDEN STATE PARK...OR 9 MILES SOUTHWEST OF
  MARSHALL...AND MOVING NORTHEAST AT 50 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  MARSHALL AROUND 420 PM CDT...
  COTTONWOOD AROUND 430 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.

THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. THIS IS AN
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4462 9560 4454 9558 4445 9559 4444 9590
      4464 9567 4463 9561
TIME...MOT...LOC 2113Z 238DEG 43KT 4437 9585
WIND...HAIL 80MPH 1.25IN

$$

WEISSER

2 follow-up statements

963 
WWUS53 KFSD 012132
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
432 PM CDT FRI JUL 1 2011

MNC083-012145-
/O.CON.KFSD.SV.W.0152.000000T0000Z-110701T2145Z/
LYON MN-
432 PM CDT FRI JUL 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
LYON COUNTY UNTIL 445 PM CDT...

AT 431 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...
AND DESTRUCTIVE WINDS IN EXCESS OF 80 MPH.  THIS STORM WAS LOCATED 7
MILES EAST OF MARSHALL...MOVING NORTHEAST AT 55 MPH.

THIS SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF
NORTHEASTERN LYON COUNTY.

MULTIPLE REPORTS OF VERY STRONG WIND DAMAGE HAVE BEEN REPORTED FROM 
RUSSELL TO BALATON TO GARVIN TO MARSHALL AND LIKELY MANY POINTS IN 
BETWEEN. 

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 IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR LARGE DESTRUCTIVE HAIL CAPABLE OF PRODUCING
SIGNIFICANT DAMAGE. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

THIS STORM HAS A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE ACROSS 
EAST CENTRAL SOUTH DAKOTA INTO SOUTHWEST MINNESOTA. THIS IS AN 
EXTREMELY DANGEROUS SITUATION. SEEK SHELTER NOW INSIDE A STURDY 
STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4462 9560 4454 9558 4445 9559 4444 9590
      4464 9567 4463 9561
TIME...MOT...LOC 2131Z 233DEG 48KT 4451 9558
WIND...HAIL 80MPH 1.25IN

$$

WEISSER

423 
WWUS53 KFSD 012143
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
443 PM CDT FRI JUL 1 2011

MNC083-012153-
/O.EXP.KFSD.SV.W.0152.000000T0000Z-110701T2145Z/
LYON MN-
443 PM CDT FRI JUL 1 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LYON COUNTY WILL
EXPIRE AT 445 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA...HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.

LAT...LON 4462 9560 4454 9558 4445 9559 4444 9590
      4464 9567 4463 9561
TIME...MOT...LOC 2143Z 233DEG 48KT 4461 9540

$$

WEISSER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 1, 3:13 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Pipestone	62 min
Jul 1, 3:31 PM CDT	Tornado Warning	FSD	Lincoln, Pipestone	29 min
Jul 1, 3:41 PM CDT	Flash Flood Warning	FSD	Lincoln, Pipestone	100 min
Jul 1, 3:51 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Lyon, Murray	39 min
Jul 1, 3:53 PM CDT	Tornado Warning	FSD	Lincoln	21 min
Jul 1, 4:02 PM CDT	Flash Flood Warning	FSD	Lyon, Murray	3 hr
Jul 1, 5:05 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Nobles, Pipestone, Rock	25 min
Jul 1, 5:44 PM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Jackson, Murray, Nobles	46 min
Jul 1, 6:27 PM CDT	Severe Thunderstorm Warning	FSD	Cottonwood	16 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.