Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 207, NWS Twin Cities, MN

August 1, 20114 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 1, 2011, 6:45 AM CDT for 4 counties in Minnesota. It was in force for 45 min. 7 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 1, 2011, 6:45 AM CDT (11:45 UTC)
Expired
Aug 1, 2011, 7:30 AM CDT
In force
45 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Douglas County, MN, Pope County, MN, Stevens County, MN, Todd County, MN

The radar

The Minneapolis radar (KMPX), 192 km from the middle of the area, began a volume at 11:46 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 1, 6:46 AM CDTTSTM WND DMG8 S Evansville, MNLARGE TREES BLOWN DOWN. STREET SIGN BLOWN DOWN.
Aug 1, 6:47 AM CDTTSTM WND DMGEvansville, MNPOWERLINE DOWNED
Aug 1, 6:55 AM CDTTSTM WND DMGBrandon, MNA GROVE OF TREES BLOWN DOWN BETWEEN COUNTY ROAD 114 AND COUNTY ROAD 4.
Aug 1, 6:58 AM CDTTSTM WND DMGBrandon, MN
Aug 1, 7:14 AM CDTHAIL 0.753 Se Holmes, MN
Aug 1, 7:22 AM CDTTSTM WND GST 68Alexandria, MNI-94 MILE POST 104
Aug 1, 7:30 AM CDTTSTM WND DMGGlenwood, MNPOWER LINES DOWN...LARGE TREES UPROOTED...WIDESPREAD TREE DAMAGE AROUND TOWN. TIME ESTIMATED.

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 1, 4:57 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.8 hours before the alert went out and 190 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 00:00Z on 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3497 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 square meters per square second.19395878Sfc1 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
3497 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
1196 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
120 m²/s²
Significant tornado parameter
1.2
Supercell composite
9.8

Open this sounding in Storm Lab

The text

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

899 
WUUS53 KMPX 011145
SVRMPX
MNC041-121-149-153-011230-
/O.NEW.KMPX.SV.W.0207.110801T1145Z-110801T1230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
645 AM CDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DOUGLAS COUNTY IN WEST CENTRAL MINNESOTA...
  NORTHERN POPE COUNTY IN WEST CENTRAL MINNESOTA...
  NORTHEASTERN STEVENS COUNTY IN WEST CENTRAL MINNESOTA...
  WEST CENTRAL TODD COUNTY IN CENTRAL MINNESOTA...

* UNTIL 730 AM CDT

* AT 642 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 5 MILES SOUTHWEST OF BRANDON...OR ABOUT 13
  MILES WEST OF ALEXANDRIA...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  ALEXANDRIA...
  GLENWOOD...
  BRANDON...
  EVANSVILLE...
  KENSINGTON...
  GARFIELD...
  STARBUCK...
  LOWRY...
  LONG BEACH...
  FORADA...
  MILTONA...
  CARLOS...
  ROSE CITY...
  OSAKIS...

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.

&&

LAT...LON 4613 9491 4551 9535 4574 9595 4577 9593
      4577 9577 4596 9579 4604 9572
TIME...MOT...LOC 1145Z 275DEG 32KT 4590 9560
WIND...HAIL 60MPH 1.00IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 6:25 AM CDTAreal Flood AdvisoryMPXDouglas, Pope, Stevens6 hr
Aug 1, 7:13 AM CDTTornado WarningMPXDouglas, Pope47 min
Aug 1, 7:27 AM CDTSevere Thunderstorm WarningMPXDouglas, Kandiyohi, Morrison, Pope, Stearns, Todd63 min
Aug 1, 8:13 AM CDTAreal Flood AdvisoryMPXKandiyohi, Meeker, Pope, Stearns3 hr
Aug 1, 9:00 AM CDTSpecial Weather StatementMPXBenton, Sherburne, Stearns, Wright60 min
Aug 1, 9:39 AM CDTFlash Flood WarningMPXDouglas, Pope3 hr
Aug 1, 9:44 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Meeker46 min
Aug 1, 10:53 AM CDTSevere Thunderstorm WarningMPXBenton, Kandiyohi, Stearns67 min
Aug 1, 11:09 AM CDTSevere Thunderstorm WarningMPXKandiyohi, Meeker, Stearns66 min
Aug 1, 11:53 AM CDTSevere Thunderstorm WarningMPXSherburne, Stearns, Wright67 min
Aug 1, 12:03 PM CDTSevere Thunderstorm WarningMPXCarver, McLeod, Meeker, Renville, Sibley57 min
Aug 1, 12:45 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin45 min
Aug 1, 1:01 PM CDTAreal Flood AdvisoryMPXCarver, Dakota, Hennepin, Ramsey, Scott3 hr
Aug 1, 1:18 PM CDTSevere Thunderstorm WarningMPXDakota, Le Sueur, Rice, Scott, Sibley57 min
Aug 1, 1:25 PM CDTSevere Thunderstorm WarningMPXDakota, Hennepin, Ramsey, Washington65 min
Aug 1, 2:02 PM CDTSevere Thunderstorm WarningMPXGoodhue, Le Sueur, Rice, Steele, Waseca58 min
Aug 1, 3:04 PM CDTSevere Thunderstorm WarningMPXGoodhue37 min
Aug 1, 3:54 PM CDTSpecial Weather StatementMPXAnoka, Chisago, Isanti, Mille Lacs51 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.