Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 187, NWS Twin Cities, MN

July 30, 2011Stevens County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 30, 2011, 11:48 AM CDT for Stevens County, Minnesota. It was in force for 42 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: Jul 30, 2011, 11:48 AM CDT (16:48 UTC)
Expired: Jul 30, 2011, 12:30 PM CDT
In force: 42 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Stevens County, MN

The radar

The Aberdeen radar (KABR), 191 km from the middle of the area, began a volume at 16:50 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 30, 12:09 PM CDT	HAIL 1	3 N Donnelly, MN

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 4.8 hours before the alert went out and 209 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: 2567 J/kg
Mixed-layer CIN: -127 J/kg
Mixed-layer LCL: 1142 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 197 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 8.7

Open this sounding in Storm Lab

The text

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

738 
WUUS53 KMPX 301648
SVRMPX
MNC149-301730-
/O.NEW.KMPX.SV.W.0187.110730T1648Z-110730T1730Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1148 AM CDT SAT JUL 30 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 1230 PM CDT

* AT 1147 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
  THIS STORM WAS LOCATED 10 MILES SOUTH OF CHARLESVILLE...OR ABOUT 14
  MILES EAST OF WHEATON...AND MOVING SOUTHEAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  DONNELLY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH AND LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

REPORT ANY SIGNIFICANT WIND OR HAIL DAMAGE TO THE NEAREST LAW
ENFORCEMENT AGENCY...FOR RELAY TO THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 4577 9593 4577 9577 4555 9577 4570 9627
      4576 9627
TIME...MOT...LOC 1648Z 296DEG 31KT 4581 9619
WIND...HAIL 60MPH 1.00IN

$$

CLF

1 follow-up statement

207 
WWUS53 KMPX 301707
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1207 PM CDT SAT JUL 30 2011

MNC149-301730-
/O.CON.KMPX.SV.W.0187.000000T0000Z-110730T1730Z/
STEVENS MN-
1207 PM CDT SAT JUL 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHERN
STEVENS COUNTY UNTIL 1230 PM CDT...

AT 1201 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 5 MILES NORTH OF
DONNELLY...OR 14 MILES NORTHWEST OF MORRIS...MOVING SOUTHEAST AT 35
MPH.

THIS STORM HAS ALSO SHOWED ROTATION AND WILL BE MONITORED FOR ITS 
TORNADO POTENTIAL.

LOCATIONS IMPACTED INCLUDE...
  DONNELLY.

LAT...LON 4568 9617 4576 9618 4577 9593 4577 9577
      4555 9577
TIME...MOT...LOC 1705Z 296DEG 31KT 4574 9600
WIND...HAIL 60MPH 1.00IN

$$

CLF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 3:56 AM CDT	Special Weather Statement	MPX	Douglas, Todd	64 min
Jul 30, 9:53 AM CDT	Special Weather Statement	MPX	Mille Lacs	52 min
Jul 30, 10:32 AM CDT	Special Weather Statement	MPX	Chisago, Isanti, Kanabec	58 min
Jul 30, 1:07 PM CDT	Special Weather Statement	MPX	Lac qui Parle	53 min
Jul 30, 6:06 PM CDT	Severe Thunderstorm Warning	MPX	Todd	54 min
Jul 30, 6:54 PM CDT	Severe Thunderstorm Warning	MPX	Todd	51 min
Jul 30, 6:58 PM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs, Morrison	62 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.