Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 101, NWS Twin Cities, MN

July 1, 20115 counties in Minnesota; Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2011, 6:27 PM CDT for 5 counties in Minnesota; Polk County, Wisconsin. It was in force for 63 min. 12 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
Jul 1, 2011, 6:27 PM CDT (23:27 UTC)
Expired
Jul 1, 2011, 7:30 PM CDT
In force
63 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.75 in
Wind
70.0 mph

Counties Anoka County, MN, Chisago County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 111 km from the middle of the area, began a volume at 23:26 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
Jul 1, 6:29 PM CDTHAIL 1Cambridge, MN
Jul 1, 6:30 PM CDTTSTM WND DMG1 Sse Cambridge, MN2 LARGE 12 INCH DIAMETER TREES DOWN ACROSS PAULS LAKE ROAD. 6 INCH DIAMETER PINE TREE DOWN ON FENCE ALONG 16TH ST SE. TIME ESTIMATED.
Jul 1, 6:30 PM CDTTSTM WND DMG3 Nne Maplewood, MNTHREE TO FOUR INCH TREE LIMBS DOWNED.
Jul 1, 6:31 PM CDTHAIL 1.5Isanti, MN
Jul 1, 6:35 PM CDTHAIL 1.75Cambridge, MN
Jul 1, 6:36 PM CDTHAIL 1.25Sse Cambridge, MN
Jul 1, 6:41 PM CDTTSTM WND DMG1 E Mora, MN14 INCH TO 16 INCH TREES DOWN
Jul 1, 6:41 PM CDTTSTM WND GST 60Cambridge, MN50-60 MPH MEASURED
Jul 1, 6:45 PM CDTTSTM WND DMG1 Se Cambridge, MNONE FOOT DIAMETER TREE DOWN.
Jul 1, 6:45 PM CDTTSTM WND DMG4 Ssw North Branch, MNTREES DOWN
Jul 1, 7:00 PM CDTTSTM WND DMG3 Ne Rush City, MNWIDESPREAD WIND DAMAGE AROUND RUSH CITY INCLUDING MULTIPLE 12 INCH DIAMETER TREES SNAPPED.
Jul 1, 7:40 PM CDTTSTM WND DMGCambridge, MNROOF BLOWN OFF SUPER AMERICA, 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
Jul 1, 2:08 PM CDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 112 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 2011-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3970 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 12:00Z on 2011-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 5 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
3970 J/kg
Mixed-layer CIN
-245 J/kg
Mixed-layer LCL
1089 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
5 m²/s²
0-3 km storm-relative helicity
21 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.7

Open this sounding in Storm Lab

The text

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

157 
WUUS53 KMPX 012327
SVRMPX
MNC003-025-059-065-095-WIC095-020030-
/O.NEW.KMPX.SV.W.0101.110701T2327Z-110702T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
627 PM CDT FRI JUL 1 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN KANABEC COUNTY IN EAST CENTRAL MINNESOTA...
  EAST CENTRAL MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHWESTERN POLK COUNTY IN NORTHWEST WISCONSIN...

* UNTIL 730 PM CDT

* AT 622 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH. THESE STORMS WERE LOCATED
  ALONG A LINE EXTENDING FROM MORA TO BRAHAM TO 7 MILES SOUTHEAST OF
  BODUM...AND MOVING NORTHEAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  MORA...
  CAMBRIDGE...
  NORTH BRANCH...
  GRASSTON...
  BRAHAM...
  STANCHFIELD...
  GRANDY...
  BODUM...
  STACY...
  OGILVIE...
  LEWIS LAKE...
  ISANTI...
  WYOMING...
  EAST BETHEL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. PREPARE TO MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM IF A TORNADO IS SPOTTED.

&&

LAT...LON 4598 9304 4597 9313 4574 9314 4573 9286
      4565 9287 4565 9254 4573 9254 4573 9243
      4563 9241 4521 9322 4572 9332 4573 9352
      4586 9353 4609 9305
TIME...MOT...LOC 2327Z 224DEG 31KT 4592 9332 4579 9312
          4549 9306
WIND...HAIL 70MPH 1.75IN

$$

JLT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 4:05 PM CDTSevere Thunderstorm WarningMPXBrown, Redwood, Renville, Yellow Medicine55 min
Jul 1, 4:31 PM CDTSevere Thunderstorm WarningMPXMeeker, Wright59 min
Jul 1, 4:37 PM CDTTornado WarningMPXRedwood, Renville23 min
Jul 1, 4:53 PM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Redwood, Renville, Sibley67 min
Jul 1, 4:57 PM CDTTornado WarningMPXRedwood, Renville33 min
Jul 1, 4:59 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison, Stearns61 min
Jul 1, 5:13 PM CDTSevere Thunderstorm WarningMPXKandiyohi, McLeod, Meeker, Renville, Sibley, Stearns and 1 more62 min
Jul 1, 5:27 PM CDTSevere Thunderstorm WarningMPXAnoka, Isanti, Sherburne, Wright48 min
Jul 1, 5:38 PM CDTSevere Thunderstorm WarningMPXBenton, Kanabec, Mille Lacs, Morrison67 min
Jul 1, 5:52 PM CDTSevere Thunderstorm WarningMPXAnoka, Benton, Hennepin, Isanti, Meeker, Mille Lacs and 3 more53 min
Jul 1, 6:02 PM CDTSpecial Weather StatementMPXCarver, Hennepin, Scott43 min
Jul 1, 6:16 PM CDTSevere Thunderstorm WarningMPXBenton, Morrison, Stearns29 min
Jul 1, 6:20 PM CDTTornado WarningMPXBenton, Sherburne, Stearns25 min
Jul 1, 6:42 PM CDTSevere Thunderstorm WarningMPXAnoka, Benton, Chisago, Hennepin, Isanti, Kanabec and 5 more63 min
Jul 1, 6:42 PM CDTSevere Thunderstorm WarningMPXMartin33 min
Jul 1, 6:56 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, Nicollet34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011Severe Thunderstorm Warnings in Wisconsin, 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.