Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 214, NWS Twin Cities, MN

August 1, 2011Carver County, Hennepin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 1, 2011, 12:45 PM CDT for Carver County, Hennepin County, Minnesota. It was in force for 45 min. 9 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, 12:45 PM CDT (17:45 UTC)
Expired: Aug 1, 2011, 1:30 PM CDT
In force: 45 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Carver County, MN, Hennepin County, MN

The radar

The Minneapolis radar (KMPX), 15 km from the middle of the area, began a volume at 17:48 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
Aug 1, 12:50 PM CDT	TSTM WND DMG	1 Wnw Minnetrista, MN	LARGE 12 INCH TREE DOWN
Aug 1, 12:50 PM CDT	TSTM WND DMG	2 Ssw Maple Plain, MN	SEVERAL LARGE TREES DOWN NEAR COUNTY ROADS 26 AND 110 IN NORTHEAST MINNETRISTA. POWER LINES ALSO REPORTED DOWN.
Aug 1, 12:50 PM CDT	TSTM WND DMG	2 W Mound, MN	TREE DOWN ACROSS COUNTY ROAD 15.
Aug 1, 1:05 PM CDT	TSTM WND DMG	Minneapolis, MN	6 INCH BRANCHES DOWN AT 24TH AND GARFIELD AVE S. TIME ESTIMATED BY RADAR.
Aug 1, 1:05 PM CDT	TSTM WND DMG	Ne Minneapolis, MN	1.5 TO 2 INCH BRANCES DOWN AT BUCHANAN AND WINTER STREETS. TIME ESTIMATED BY RADAR.
Aug 1, 1:27 PM CDT	TSTM WND GST 35	Medina, MN	HIGHWAY 55 AND 101. CORRECTED WIND SPEED.
Aug 1, 1:27 PM CDT	TSTM WND GST 350	Medina, MN	HIGHWAY 55 AND 101
Aug 1, 1:29 PM CDT	TSTM WND DMG	5 Nne Minneapolis, MN	12 INCH DIAMETER TREE DOWN
Aug 1, 1:30 PM CDT	TSTM WND DMG	1 Wnw Minnetrista, MN	LARGE 12 INCH TREE 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.

Issued	Product	Office	Lasted
Aug 1, 11:52 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 5.8 hours before the alert went out and 15 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: 2974 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 898 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

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

080 
WUUS53 KMPX 011745
SVRMPX
MNC019-053-011830-
/O.NEW.KMPX.SV.W.0214.110801T1745Z-110801T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1245 PM CDT MON AUG 1 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 130 PM CDT

* AT 1244 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
  LOCATED NEAR INDEPENDENCE...OR ABOUT 13 MILES SOUTHEAST OF
  BUFFALO...AND MOVING EAST AT 35 MPH.  PENNY SIZE HAIL MAY ALSO
  ACCOMPANY THESE DAMAGING WINDS.

LOCATIONS IN THE WARNING INCLUDE...
  PLYMOUTH...
  MINNEAPOLIS...
  ST BONIFACIUS...
  INDEPENDENCE...
  MINNETRISTA...
  MAPLE PLAIN...
  LORETTO...
  MOUND...
  VICTORIA...
  ORONO...
  MEDINA...
  HAMEL...
  LONG LAKE...
  SHOREWOOD...
  CHANHASSEN...

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.

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 4503 9321 4484 9322 4482 9348 4488 9381
      4498 9378 4498 9377 4500 9377 4505 9376
      4512 9372 4512 9370
TIME...MOT...LOC 1745Z 280DEG 29KT 4502 9372
WIND...HAIL 60MPH 0.75IN

$$

1 follow-up statement

958 
WWUS53 KMPX 011810
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
110 PM CDT MON AUG 1 2011

MNC019-053-011830-
/O.CON.KMPX.SV.W.0214.000000T0000Z-110801T1830Z/
CARVER MN-HENNEPIN MN-
110 PM CDT MON AUG 1 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
HENNEPIN AND EAST CENTRAL CARVER COUNTIES UNTIL 130 PM CDT...

AT 106 PM CDT...NATIONAL WEATHER SERVICE 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 MAPLE
GROVE TO MEDICINE LAKE TO CHANHASSEN...MOVING EAST AT 35 MPH.

IN ADDITION...AT 1250 PM...TRESS WERE REPORTED DOWN IN MINNETRISTA.

LOCATIONS IMPACTED INCLUDE...
  MINNEAPOLIS...EDEN PRAIRIE...HOPKINS...NEW HOPE...GOLDEN VALLEY...
  ST LOUIS PARK...CRYSTAL...ROBBINSDALE...EDINA AND RICHFIELD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4503 9321 4484 9323 4482 9348 4489 9373
      4496 9366 4497 9370 4498 9366 4502 9362
      4507 9361 4510 9358
TIME...MOT...LOC 1809Z 280DEG 29KT 4507 9344 4498 9341
          4486 9348
WIND...HAIL 60MPH <.75IN

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 6:25 AM CDT	Areal Flood Advisory	MPX	Douglas, Pope, Stevens	6 hr
Aug 1, 6:45 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens, Todd	45 min
Aug 1, 7:13 AM CDT	Tornado Warning	MPX	Douglas, Pope	47 min
Aug 1, 7:27 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Kandiyohi, Morrison, Pope, Stearns, Todd	63 min
Aug 1, 8:13 AM CDT	Areal Flood Advisory	MPX	Kandiyohi, Meeker, Pope, Stearns	3 hr
Aug 1, 9:00 AM CDT	Special Weather Statement	MPX	Benton, Sherburne, Stearns, Wright	60 min
Aug 1, 9:39 AM CDT	Flash Flood Warning	MPX	Douglas, Pope	3 hr
Aug 1, 9:44 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker	46 min
Aug 1, 10:53 AM CDT	Severe Thunderstorm Warning	MPX	Benton, Kandiyohi, Stearns	67 min
Aug 1, 11:09 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Meeker, Stearns	66 min
Aug 1, 11:53 AM CDT	Severe Thunderstorm Warning	MPX	Sherburne, Stearns, Wright	67 min
Aug 1, 12:03 PM CDT	Severe Thunderstorm Warning	MPX	Carver, McLeod, Meeker, Renville, Sibley	57 min
Aug 1, 1:01 PM CDT	Areal Flood Advisory	MPX	Carver, Dakota, Hennepin, Ramsey, Scott	3 hr
Aug 1, 1:18 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Le Sueur, Rice, Scott, Sibley	57 min
Aug 1, 1:25 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin, Ramsey, Washington	65 min
Aug 1, 2:02 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue, Le Sueur, Rice, Steele, Waseca	58 min
Aug 1, 3:04 PM CDT	Severe Thunderstorm Warning	MPX	Goodhue	37 min
Aug 1, 3:54 PM CDT	Special Weather Statement	MPX	Anoka, Chisago, Isanti, Mille Lacs	51 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.