Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 97, NWS Twin Cities, MN

July 1, 20114 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2011, 5:27 PM CDT for 4 counties in Minnesota. It was in force for 48 min. 14 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, 5:27 PM CDT (22:27 UTC)
Expired
Jul 1, 2011, 6:15 PM CDT
In force
48 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.75 in
Wind
65.0 mph

Counties Anoka County, MN, Isanti County, MN, Sherburne County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 46 km from the middle of the area, began a volume at 22:27 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, 5:31 PM CDTHAIL 14 Sse Silver Creek, MN
Jul 1, 5:40 PM CDTHAIL 22 S Monticello, MN
Jul 1, 5:43 PM CDTHAIL 17 Sw Monticello, MN
Jul 1, 5:45 PM CDTHAIL 2.75Monticello, MNTIME ESTIMATED.
Jul 1, 5:46 PM CDTHAIL 0.75Big Lake, MN
Jul 1, 5:46 PM CDTHAIL 1Monticello, MN
Jul 1, 5:56 PM CDTTSTM WND DMG1 Se Monticello, MNUTILITY POWER LOST.
Jul 1, 5:56 PM CDTHAIL 2Big Lake, MNCOUNTY ROAD 81 AND HIGHWAY 10
Jul 1, 5:58 PM CDTHAIL 1.752 Nne Big Lake, MN
Jul 1, 6:01 PM CDTTSTM WND GST 701 S Big Lake, MN
Jul 1, 6:13 PM CDTTSTM WND GST 52Monticello, MNCTY 18 AND I 94
Jul 1, 6:14 PM CDTTSTM WND GST 68Buffalo, MNMEASURED AT BUFFALO AIRPORT
Jul 1, 6:15 PM CDTTSTM WND GST 711 S Big Lake, MN
Jul 1, 6:23 PM CDTHAIL 11 Sw Zimmerman, MN

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, 10.5 hours before the alert went out and 45 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.

503 
WUUS53 KMPX 012227
SVRMPX
MNC003-059-141-171-012315-
/O.NEW.KMPX.SV.W.0097.110701T2227Z-110701T2315Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHWESTERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN AND SOUTHERN SHERBURNE COUNTY IN CENTRAL MINNESOTA...
  EAST CENTRAL WRIGHT COUNTY IN CENTRAL MINNESOTA...

* UNTIL 615 PM CDT

* AT 522 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING LARGE DAMAGING HAIL UP TO GOLF BALL SIZE AND DAMAGING
  WINDS IN EXCESS OF 65 MPH. THIS STORM WAS LOCATED NEAR BUFFALO...
  AND MOVING NORTHEAST AT 45 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  BUFFALO...
  MONTICELLO...
  ST MICHAEL...
  ALBERTVILLE...
  BIG LAKE...
  OTSEGO...
  ELK RIVER...
  ZIMMERMAN...
  ST FRANCIS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH WILL UPROOT TREES AND DOWN POWER LINES.
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4535 9325 4521 9361 4520 9363 4521 9364
      4519 9366 4509 9391 4517 9404 4555 9354
TIME...MOT...LOC 2227Z 226DEG 40KT 4521 9387
WIND...HAIL 65MPH 1.75IN

$$

TDK

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, 5:38 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, 6:27 PM CDTSevere Thunderstorm WarningMPXAnoka, Chisago, Isanti, Kanabec, Mille Lacs63 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, 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.