Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 70, NWS Twin Cities, MN

May 30, 2011Stevens County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 30, 2011, 8:59 PM CDT for Stevens County, Minnesota. It was in force for 16 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: May 30, 2011, 8:59 PM CDT (01:59 UTC)
Expired: May 30, 2011, 9:15 PM CDT
In force: 16 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Stevens County, MN

The radar

The Aberdeen radar (KABR), 180 km from the middle of the area, began a volume at 02:00 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
May 30, 8:59 PM CDT	HAIL 0.5	5 N Chokio, MN

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
May 30, 3:52 PM CDT	Tornado Watch	SPC	7 hr
May 30, 8:43 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 2.0 hours before the alert went out and 198 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: 1125 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 775 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 174 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.0

Open this sounding in Storm Lab

The text

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

220 
WUUS53 KMPX 310159
SVRMPX
MNC149-310215-
/O.NEW.KMPX.SV.W.0070.110531T0159Z-110531T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
859 PM CDT MON MAY 30 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  STEVENS COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 915 PM CDT

* AT 854 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
  WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR CHOKIO...OR
  ABOUT 13 MILES WEST OF MORRIS...AND MOVING NORTH AT 55 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  DONNELLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT TUESDAY MORNING
FOR SOUTHERN MINNESOTA.

&&

LAT...LON 4567 9626 4576 9626 4577 9583 4576 9581
      4546 9599 4552 9626 4567 9627
TIME...MOT...LOC 0159Z 196DEG 46KT 4571 9613
WIND...HAIL 60MPH 1.75IN

$$

1 follow-up statement

442 
WWUS53 KMPX 310210
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
910 PM CDT MON MAY 30 2011

MNC149-310215-
/O.CON.KMPX.SV.W.0070.000000T0000Z-110531T0215Z/
STEVENS MN-
910 PM CDT MON MAY 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
STEVENS COUNTY UNTIL 915 PM CDT...

AT 907 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 5 MILES NORTHWEST
OF DONNELLY...OR 14 MILES NORTHWEST OF MORRIS...MOVING NORTH AT 55
MPH.

LOCATIONS IMPACTED INCLUDE...
  RURAL PORTIONS OF NORTHERN STEVENS COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

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.

&&

LAT...LON 4577 9588 4556 9601 4560 9626 4567 9627
      4567 9626 4576 9626
TIME...MOT...LOC 0210Z 196DEG 46KT 4577 9610
WIND...HAIL 60MPH 1.75IN

$$

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 8:35 PM CDT	Special Weather Statement	MPX	Stevens	40 min
May 30, 8:40 PM CDT	Severe Thunderstorm Warning	MPX	Stevens	20 min
May 30, 9:38 PM CDT	Severe Thunderstorm Warning	MPX	Lac qui Parle, Yellow Medicine	51 min
May 30, 9:57 PM CDT	Severe Thunderstorm Warning	MPX	Douglas	48 min
May 30, 10:11 PM CDT	Special Weather Statement	MPX	Redwood	79 min
May 30, 10:41 PM CDT	Special Weather Statement	MPX	Todd	49 min
May 30, 11:07 PM CDT	Special Weather Statement	MPX	Morrison	38 min
May 30, 11:30 PM CDT	Severe Thunderstorm Warning	MPX	Morrison	30 min
May 30, 11:59 PM CDT	Special Weather Statement	MPX	Kanabec	31 min
May 31, 3:40 AM CDT	Wind Advisory	MPX	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more	18 hr
May 31, 10:51 AM CDT	River Flood Warning	MPX	Carver, Hennepin, Scott	70 hr

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.