Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 225, NWS Twin Cities, MN

August 2, 2011Benton County, Stearns County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 2, 2011, 7:39 AM CDT for Benton County, Stearns County, Minnesota. It was in force for 51 min. 5 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
Aug 2, 2011, 7:39 AM CDT (12:39 UTC)
Expired
Aug 2, 2011, 8:30 AM CDT
In force
51 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Benton County, MN, Stearns County, MN

The radar

The Minneapolis radar (KMPX), 106 km from the middle of the area, began a volume at 12:43 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

TimeReportWhereRemark
Aug 2, 7:51 AM CDTTSTM WND DMG2 S Avon, MNTWO 10 INCH DIAMETER TREES DOWN.
Aug 2, 8:05 AM CDTTSTM WND DMG2 N St Joseph, MNSEVERAL 10 AND 12 INCH DIAMETER TREES DOWN.
Aug 2, 8:08 AM CDTTSTM WND DMGSauk Rapids, MNLOT OF TREES DOWN AROUND TOWN.
Aug 2, 8:14 AM CDTTSTM WND DMGCollegeville, MN14 INCH PINE TREE BROKEN OFF AT ST JOHNS UNIVERSITY.
Aug 2, 8:30 AM CDTTSTM WND DMGN Glendorado, MNA FEW 6-10 INCH DIAMETER TREES DOWN

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.

IssuedProductOfficeLasted
Aug 2, 5:23 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 0.7 hours before the alert went out and 105 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2011-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2133 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2011-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 233 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2133 J/kg
Mixed-layer CIN
-209 J/kg
Mixed-layer LCL
850 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
233 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

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

109 
WUUS53 KMPX 021239
SVRMPX
MNC009-145-021330-
/O.NEW.KMPX.SV.W.0225.110802T1239Z-110802T1330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
739 AM CDT TUE AUG 2 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BENTON COUNTY IN CENTRAL MINNESOTA...
  NORTHEASTERN STEARNS COUNTY IN CENTRAL MINNESOTA...

* UNTIL 830 AM CDT

* AT 738 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE
  STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 5 MILES NORTHEAST
  OF FREEPORT TO AVON TO ST JOSEPH...AND MOVING EAST AT 40 MPH. 
  PENNY SIZE HAIL MAY ALSO ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IN THE WARNING INCLUDE...
  AVON...
  ALBANY...
  FREEPORT...
  ST ROSA...
  FARMING...
  COLLEGEVILLE...
  ST JOSEPH...
  HOLDINGFORD...
  WAITE PARK...
  SARTELL...
  ST STEPHEN...
  SAUK RAPIDS...
  RICE...
  MAYHEW...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

WIND DAMAGE WITH THIS STORM WILL OCCUR WELL AHEAD OF ANY RAIN OR
LIGHTNING. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE TAKING COVER.
SEEK SHELTER IMMEDIATELY INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4581 9375 4557 9376 4556 9415 4549 9465
      4577 9483 4578 9429 4582 9435 4582 9377
TIME...MOT...LOC 1239Z 258DEG 36KT 4571 9459 4564 9445
          4552 9437
WIND...HAIL 60MPH 0.75IN

$$
1 follow-up statement
179 
WWUS53 KMPX 021310
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
810 AM CDT TUE AUG 2 2011

MNC145-021325-
/O.CAN.KMPX.SV.W.0225.000000T0000Z-110802T1330Z/
STEARNS MN-
810 AM CDT TUE AUG 2 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN STEARNS COUNTY IS
CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4577 9375 4557 9376 4556 9415 4562 9421
      4567 9419 4571 9423 4572 9422 4574 9426
      4577 9427 4582 9435 4582 9377
TIME...MOT...LOC 1310Z 258DEG 36KT 4577 9415 4570 9402
          4558 9394

$$

MNC009-021330-
/O.CON.KMPX.SV.W.0225.000000T0000Z-110802T1330Z/
BENTON MN-
810 AM CDT TUE AUG 2 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR BENTON COUNTY
UNTIL 830 AM CDT...

AT 806 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN EXCESS
OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
RICE TO MAYHEW TO PARENT...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  FOLEY...GILMAN...LITTLE ROCK...RONNEBY...GLENDORADO AND RUM RIVER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO WINDOWS. EVACUATE
MOBILE HOMES AS THEY MAY BE OVERTURNED. SEEK SHELTER NOW INSIDE A
STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4577 9375 4557 9376 4556 9415 4562 9421
      4567 9419 4571 9423 4572 9422 4574 9426
      4577 9427 4582 9435 4582 9377
TIME...MOT...LOC 1310Z 258DEG 36KT 4577 9415 4570 9402
          4558 9394
WIND...HAIL 70MPH <.75IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 12:00 AM CDTRiver Flood WarningMPXTodd57 hr
Aug 2, 5:26 AM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Swift, Yellow Medicine64 min
Aug 2, 6:06 AM CDTSpecial Weather StatementMPXPope, Stevens54 min
Aug 2, 6:41 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Pope, Stearns, Swift51 min
Aug 2, 6:56 AM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Meeker, Swift64 min
Aug 2, 7:23 AM CDTSevere Thunderstorm WarningMPXMeeker, Sherburne, Stearns, Wright67 min
Aug 2, 7:24 AM CDTSpecial Weather StatementMPXBenton, Carver, Isanti, McLeod, Sherburne, Sibley and 1 more36 min
Aug 2, 7:57 AM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin, Isanti, Ramsey, Sherburne, Wright48 min
Aug 2, 8:05 AM CDTSevere Thunderstorm WarningMPXBenton, Isanti, Kanabec, Mille Lacs55 min
Aug 2, 8:31 AM CDTSevere Thunderstorm WarningMPXAnoka, Chisago, Isanti, Washington74 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011Every 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.