Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 9, NWS Twin Cities, MN

May 9, 2011Stevens County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 9, 2011, 2:39 AM CDT for Stevens County, Minnesota. It was in force for 36 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 9, 2011, 2:39 AM CDT (07:39 UTC)
Expired: May 9, 2011, 3:15 AM CDT
In force: 36 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Stevens County, MN

The radar

The Minneapolis radar (KMPX), 198 km from the middle of the area, began a volume at 07:39 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
May 9, 2:47 AM CDT	HAIL 0.75	6 E Donnelly, MN

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 00:00Z, 7.7 hours before the alert went out and 196 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: 1913 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 184 m²/s²
0-3 km storm-relative helicity: 415 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.

671 
WUUS53 KMPX 090739
SVRMPX
MNC149-090815-
/O.NEW.KMPX.SV.W.0009.110509T0739Z-110509T0815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
239 AM CDT MON MAY 9 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 315 AM CDT

* AT 234 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR MORRIS...
  AND MOVING NORTH AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  DONNELLY...
  RURAL AREAS OF NORTHEAST STEVENS COUNTY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4577 9583 4576 9576 4563 9575 4559 9576
      4558 9574 4550 9575 4551 9601 4577 9602
TIME...MOT...LOC 0738Z 184DEG 17KT 4560 9587
WIND...HAIL <50MPH 1.00IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 2:11 AM CDT	Special Weather Statement	MPX	Stevens	49 min
May 9, 2:27 AM CDT	Special Weather Statement	MPX	Lac qui Parle	48 min
May 9, 2:54 AM CDT	Severe Thunderstorm Warning	MPX	Pope, Stevens, Swift	52 min
May 9, 3:11 AM CDT	Special Weather Statement	MPX	Chippewa, Yellow Medicine	64 min
May 9, 3:42 AM CDT	Special Weather Statement	MPX	Kandiyohi, Meeker, Redwood, Renville, Stearns	93 min
May 9, 4:19 AM CDT	Special Weather Statement	MPX	Brown, Kandiyohi, McLeod, Meeker, Redwood, Renville and 1 more	41 min
May 9, 4:32 AM CDT	Special Weather Statement	MPX	Benton, Brown, McLeod, Meeker, Morrison, Nicollet and 5 more	28 min
May 9, 5:03 AM CDT	Special Weather Statement	MPX	Anoka, Benton, Blue Earth, Brown, Carver, Chisago and 20 more	72 min
May 9, 5:33 AM CDT	Special Weather Statement	MPX	Anoka, Carver, Dakota, Hennepin, Le Sueur, Ramsey and 4 more	2 hr
May 9, 6:18 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Rice, Scott	57 min
May 9, 7:38 AM CDT	Special Weather Statement	MPX	Brown, Nicollet	97 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.