Alert archive / Minnesota / Tornado Warnings in 2011

Tornado Warning 10, NWS Twin Cities, MN

May 10, 2011Anoka County, Isanti County, Sherburne County, Minnesota

NWS Twin Cities, MN issued this tornado warning at May 10, 2011, 8:44 PM CDT for Anoka County, Isanti County, Sherburne County, Minnesota. It was in force for 35 min. 2 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: May 10, 2011, 8:44 PM CDT (01:44 UTC)
Expired: May 10, 2011, 9:19 PM CDT
In force: 35 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

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

The radar

The Minneapolis radar (KMPX), 59 km from the middle of the area, began a volume at 01:46 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

Time	Report	Where	Remark
May 10, 9:00 PM CDT	HAIL 1.75	St Francis, MN
May 10, 9:04 PM CDT	HAIL 1	3 Ne Elk River, 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.

Issued	Product	Office	Lasted
May 10, 5:53 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.7 hours before the alert went out and 60 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: 4330 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1463 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 183 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 33.9

Open this sounding in Storm Lab

The text

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

917 
WFUS53 KMPX 110144
TORMPX
MNC003-059-141-110230-
/O.NEW.KMPX.TO.W.0010.110511T0144Z-110511T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
844 PM CDT TUE MAY 10 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTH CENTRAL ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHEASTERN SHERBURNE COUNTY IN CENTRAL MINNESOTA...
  NORTHWESTERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 930 PM CDT

* AT 842 PM CDT...RADAR INDICATED A STORM CAPABLE OF PRODUCING A
  TORNADO. THE MOST DANGEROUS PART OF THE STORM WAS 9 MILES SOUTHWEST
  OF ST FRANCIS...OR ABOUT 2 MILES SOUTHEAST OF ELK RIVER...AND      
  MOVING NORTHEAST AT 15 MPH. TRAINED SPOTTERS HAVE ALSO REPORTED A  
  ROTATING WALL CLOUD WITH THIS STORM.

* LOCATIONS IN THE WARNING INCLUDE...
  ST FRANCIS...
  ISANTI...
  BETHEL...
  ATHENS...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON RADAR...IT MEANS THAT
STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY
BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT WEDNESDAY
MORNING FOR SOUTHEASTERN MINNESOTA.

&&

LAT...LON 4548 9323 4537 9321 4526 9351 4528 9357
      4530 9358 4529 9360 4535 9355 4552 9328
TIME...MOT...LOC 0144Z 237DEG 15KT 4532 9351

$$

4 follow-up statements

652 
WWUS53 KMPX 110158
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
858 PM CDT TUE MAY 10 2011

MNC141-110207-
/O.CAN.KMPX.TO.W.0010.000000T0000Z-110511T0230Z/
SHERBURNE MN-
858 PM CDT TUE MAY 10 2011

...THE TORNADO WARNING FOR SOUTHEASTERN SHERBURNE COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

LAT...LON 4548 9323 4537 9321 4531 9336 4531 9344
      4532 9349 4537 9352 4552 9328
TIME...MOT...LOC 0157Z 237DEG 15KT 4536 9345

$$

MNC003-059-110230-
/O.CON.KMPX.TO.W.0010.000000T0000Z-110511T0230Z/
ISANTI MN-ANOKA MN-
858 PM CDT TUE MAY 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN ANOKA AND
SOUTH CENTRAL ISANTI COUNTIES UNTIL 930 PM CDT...

AT 855 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE 
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS STORM 
WAS LOCATED 5 MILES EAST OF ELK RIVER...OR 16 MILES SOUTH OF 
PRINCETON...MOVING NORTHEAST AT 15 MPH. THIS STORM HAS A HISTORY OF 
PRODUCING FUNNEL CLOUDS SINCE 845 PM. THIS STORM IS ALSO CAPABLE OF 
PRODUCING TENNIS BALL SIZE HAIL.

LOCATIONS IMPACTED INCLUDE...
  ST FRANCIS...ISANTI...BETHEL AND ATHENS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AT NIGHT. TAKE COVER NOW.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

&&

LAT...LON 4548 9323 4537 9321 4531 9336 4531 9344
      4532 9349 4537 9352 4552 9328
TIME...MOT...LOC 0157Z 237DEG 15KT 4536 9345

$$

033 
WWUS53 KMPX 110204
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
904 PM CDT TUE MAY 10 2011

MNC003-059-110230-
/O.CON.KMPX.TO.W.0010.000000T0000Z-110511T0230Z/
ISANTI MN-ANOKA MN-
904 PM CDT TUE MAY 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN ANOKA AND
SOUTH CENTRAL ISANTI COUNTIES UNTIL 930 PM CDT...

AT 903 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE 
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS STORM HAS A 
HISTORY OF PRODUCING FUNNEL CLOUDS SINCE 830 PM. IN ADDITION...THIS 
STORM PRODUCED GOLF BALL SIZE HAIL IN ST FRANCIS AT 900 PM. THE 
STORM IS CAPABLE OF PRODUCING HAIL UP TO TENNIS BALL SIZE. THIS 
DANGEROUS STORM WAS LOCATED NEAR ST FRANCIS...OR 14 MILES SOUTHWEST 
OF CAMBRIDGE...MOVING NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST FRANCIS...ISANTI...BETHEL AND ATHENS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AT NIGHT. TAKE COVER NOW.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

&&

LAT...LON 4548 9323 4537 9321 4533 9334 4533 9343
      4539 9349 4552 9328
TIME...MOT...LOC 0203Z 237DEG 15KT 4541 9340

$$

264 
WWUS53 KMPX 110211
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
911 PM CDT TUE MAY 10 2011

MNC003-059-110230-
/O.CON.KMPX.TO.W.0010.000000T0000Z-110511T0230Z/
ISANTI MN-ANOKA MN-
911 PM CDT TUE MAY 10 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL ANOKA AND
SOUTH CENTRAL ISANTI COUNTIES UNTIL 930 PM CDT...

AT 911 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS STORM 
WAS LOCATED 3 MILES NORTH OF ST FRANCIS...OR 10 MILES SOUTHWEST OF 
CAMBRIDGE...MOVING NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  ISANTI...BETHEL AND ATHENS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AT NIGHT. TAKE COVER NOW.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

&&

LAT...LON 4548 9323 4540 9322 4539 9330 4539 9338
      4542 9344 4552 9328
TIME...MOT...LOC 0211Z 237DEG 15KT 4543 9336

$$

692 
WWUS53 KMPX 110219
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
919 PM CDT TUE MAY 10 2011

MNC003-059-110229-
/O.CAN.KMPX.TO.W.0010.000000T0000Z-110511T0230Z/
ISANTI MN-ANOKA MN-
919 PM CDT TUE MAY 10 2011

...THE TORNADO WARNING FOR NORTH CENTRAL ANOKA AND SOUTH CENTRAL
ISANTI COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR 
PROPERTY. HOWEVER...A TORNADO WARNING REMAINS IN EFFECT FOR 
NORTHWEST ISANTI COUNTY.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN THE TWIN CITIES.

LAT...LON 4548 9323 4540 9322 4539 9330 4539 9338
      4542 9344 4552 9328
TIME...MOT...LOC 0219Z 237DEG 15KT 4545 9332

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 7:00 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn, Steele	60 min
May 10, 7:06 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Mille Lacs, Sherburne	39 min
May 10, 7:21 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison	54 min
May 10, 7:24 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Dakota, Hennepin, Scott	66 min
May 10, 7:43 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin, Isanti, Mille Lacs, Sherburne, Wright	62 min
May 10, 7:46 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin, Scott	59 min
May 10, 7:47 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Mille Lacs	58 min
May 10, 7:54 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Rice, Scott	53 min
May 10, 7:55 PM CDT	Tornado Warning	MPX	Anoka, Hennepin, Sherburne, Wright	35 min
May 10, 8:10 PM CDT	Tornado Warning	MPX	Hennepin	35 min
May 10, 8:27 PM CDT	Severe Thunderstorm Warning	MPX	Isanti, Kanabec, Mille Lacs	63 min
May 10, 8:51 PM CDT	Tornado Warning	MPX	Isanti, Kanabec, Mille Lacs	39 min
May 10, 9:19 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	41 min
May 10, 9:29 PM CDT	Severe Thunderstorm Warning	MPX	Isanti, Kanabec, Mille Lacs	46 min
May 10, 9:31 PM CDT	Areal Flood Advisory	MPX	Isanti, Kanabec, Mille Lacs	3 hr
May 10, 10:00 PM CDT	Severe Thunderstorm Warning	MPX	Isanti	43 min
May 10, 10:03 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	36 min
May 10, 10:19 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	56 min
May 10, 10:43 PM CDT	Severe Thunderstorm Warning	MPX	Chisago	47 min

Nearby

Tornado Warnings in Minnesota, 2011 Every tornado warning in 2011 Tornadoes 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.