Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 162, NWS Twin Cities, MN

July 19, 2011Anoka County, Sherburne County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 19, 2011, 10:09 AM CDT for Anoka County, Sherburne County, Minnesota. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 19, 2011, 10:09 AM CDT (15:09 UTC)
Expired: Jul 19, 2011, 10:45 AM CDT
In force: 36 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 65.0 mph

Counties Anoka County, MN, Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 52 km from the middle of the area, began a volume at 15:08 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 19, 9:07 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 3.2 hours before the alert went out and 52 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: 5144 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 830 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

371 
WUUS53 KMPX 191509
SVRMPX
MNC003-141-191545-
/O.NEW.KMPX.SV.W.0162.110719T1509Z-110719T1545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1009 AM CDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  ANOKA COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHEASTERN SHERBURNE COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1045 AM CDT

* AT 1008 AM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 65 MPH.
  THIS STORM WAS LOCATED NEAR ZIMMERMAN...OR ABOUT 5 MILES SOUTH OF
  PRINCETON...AND MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  BIG LAKE...
  ELK RIVER...
  ST FRANCIS...
  RAMSEY...
  CEDAR...
  ANDOVER...
  HAM LAKE...
  EAST BETHEL...
  CENTERVILLE...

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 4542 9314 4528 9306 4515 9302 4525 9353
      4526 9355 4530 9357 4529 9360 4529 9367
      4531 9373 4542 9385
TIME...MOT...LOC 1509Z 320DEG 26KT 4549 9356
WIND...HAIL 65MPH 1.00IN

$$

2 follow-up statements

938 
WWUS53 KMPX 191525
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1025 AM CDT TUE JUL 19 2011

MNC003-141-191545-
/O.CON.KMPX.SV.W.0162.000000T0000Z-110719T1545Z/
ANOKA MN-SHERBURNE MN-
1025 AM CDT TUE JUL 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
SHERBURNE AND ANOKA COUNTIES UNTIL 1045 AM CDT...

AT 1022 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE
WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 5 MILES WEST OF ST
FRANCIS...OR 13 MILES SOUTHEAST OF PRINCETON...MOVING SOUTHEAST AT 40
MPH.

LOCATIONS IMPACTED INCLUDE...
  ST FRANCIS...RAMSEY...CEDAR...EAST BETHEL...ANDOVER...HAM LAKE...
  CENTERVILLE AND BETHEL.

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 ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE... SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4541 9314 4528 9306 4515 9302 4525 9353
      4530 9357 4529 9360 4533 9371 4542 9380
TIME...MOT...LOC 1525Z 325DEG 33KT 4539 9344
WIND...HAIL 70MPH 1.00IN

$$

411 
WWUS53 KMPX 191546
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1046 AM CDT TUE JUL 19 2011

MNC003-141-191559-
/O.EXP.KMPX.SV.W.0162.000000T0000Z-110719T1545Z/
ANOKA MN-SHERBURNE MN-
1046 AM CDT TUE JUL 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SHERBURNE AND
ANOKA COUNTIES WILL EXPIRE AT 1045 AM CDT...

THE SEVERE STORM IS JUST EXISTING THE WARNING AREA FOR THIS EXPIRING 
WARNING... AND AN ADDITIONAL WARNING HAS BEEN ISSUED TO THE SOUTH... 
WHICH INCLUDES ANOKA COUNTY THROUGH 1200 PM CDT.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 PM CDT.

LAT...LON 4541 9314 4528 9306 4515 9302 4525 9353
      4530 9357 4529 9360 4533 9371 4542 9380
TIME...MOT...LOC 1544Z 327DEG 26KT 4529 9335

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 6:20 AM CDT	Special Weather Statement	MPX	Todd	40 min
Jul 19, 6:48 AM CDT	Severe Thunderstorm Warning	MPX	Todd	57 min
Jul 19, 7:43 AM CDT	Special Weather Statement	MPX	Morrison	77 min
Jul 19, 7:46 AM CDT	Special Weather Statement	MPX	Todd	29 min
Jul 19, 8:19 AM CDT	Areal Flood Advisory	MPX	Morrison	3 hr
Jul 19, 8:26 AM CDT	Special Weather Statement	MPX	Kanabec, Mille Lacs	79 min
Jul 19, 8:35 AM CDT	Severe Thunderstorm Warning	MPX	Mille Lacs, Morrison	55 min
Jul 19, 8:53 AM CDT	Severe Thunderstorm Warning	MPX	Benton, Mille Lacs, Morrison	82 min
Jul 19, 9:01 AM CDT	Flash Flood Warning	MPX	Mille Lacs, Morrison	5 hr
Jul 19, 9:30 AM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs, Morrison	42 min
Jul 19, 9:45 AM CDT	Severe Thunderstorm Warning	MPX	Benton, Isanti, Kanabec, Mille Lacs, Sherburne	60 min
Jul 19, 10:40 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin, Ramsey	80 min
Jul 19, 11:11 AM CDT	Areal Flood Advisory	MPX	Anoka, Dakota, Ramsey, Washington	3 hr
Jul 19, 11:25 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Hennepin, Ramsey, Washington	65 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.