Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 9, NWS Sioux Falls, SD

April 9, 2011Lyon County, Murray County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 9, 2011, 8:39 AM CDT for Lyon County, Murray County, Minnesota. It was in force for 36 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, 8:39 AM CDT (13:39 UTC)
Expired: Apr 9, 2011, 9:15 AM CDT
In force: 36 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 58.0 mph

Counties Lyon County, MN, Murray County, MN

The radar

The Sioux Falls radar (KFSD), 108 km from the middle of the area, began a volume at 13:39 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, 8:45 AM CDT	HAIL 1	2 Ssw Current Lake, MN
Apr 9, 8:45 AM CDT	HAIL 1.25	1 W Current Lake, MN	QUARTER TO HALF DOLLAR...THIS IS CORRECTED REPORT

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, 1.7 hours before the alert went out and 181 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: 458 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 192 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.

572 
WUUS53 KFSD 091339
SVRFSD
MNC083-101-091415-
/O.NEW.KFSD.SV.W.0009.110409T1339Z-110409T1415Z/

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

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN LYON COUNTY IN SOUTHWEST MINNESOTA...
  NORTHERN MURRAY COUNTY IN SOUTHWEST MINNESOTA...

* UNTIL 915 AM CDT

* AT 839 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
  TRACKING A SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR
  SIZE HAIL.  THIS STORM WAS LOCATED NEAR CURRENT LAKE...OR 13 MILES
  NORTHWEST OF SLAYTON...AND MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BALATON AROUND 845 AM CDT...
  LAKE SHETEK STATE PARK AROUND 850 AM CDT...
  TRACY AROUND 900 AM CDT...

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE GARVIN.

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 4442 9559 4420 9559 4420 9547 4417 9547
      4416 9547 4397 9598 4418 9607 4420 9606
TIME...MOT...LOC 1339Z 245DEG 37KT 4412 9591
WIND...HAIL <58MPH 1.25IN

$$

MJF

1 follow-up statement

961 
WWUS53 KFSD 091357
SVSFSD

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
857 AM CDT SAT APR 9 2011

MNC083-101-091415-
/O.CON.KFSD.SV.W.0009.000000T0000Z-110409T1415Z/
LYON MN-MURRAY MN-
857 AM CDT SAT APR 9 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
MURRAY AND SOUTHEASTERN LYON COUNTIES UNTIL 915 AM CDT...

AT 857 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED NEAR LAKE SHETEK STATE PARK...OR 12 MILES NORTH OF
SLAYTON...MOVING NORTHEAST AT 45 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
  TRACY AROUND 905 AM 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 4403 9583 4419 9592 4435 9560 4420 9559
      4420 9547 4416 9547
TIME...MOT...LOC 1357Z 245DEG 37KT 4416 9570
WIND...HAIL <58MPH 1.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:50 AM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Pipestone	40 min
Apr 9, 9:13 AM CDT	Severe Thunderstorm Warning	FSD	Cottonwood, Murray	26 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.