Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 159, NWS Twin Cities, MN

July 19, 2011Benton County, Mille Lacs County, Morrison County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 19, 2011, 8:53 AM CDT for Benton County, Mille Lacs County, Morrison County, Minnesota. It was in force for 82 min. 4 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 19, 2011, 8:53 AM CDT (13:53 UTC)
Expired: Jul 19, 2011, 10:15 AM CDT
In force: 82 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.75 in
Wind: 65.0 mph

Counties Benton County, MN, Mille Lacs County, MN, Morrison County, MN

The radar

The Minneapolis radar (KMPX), 101 km from the middle of the area, began a volume at 13:55 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
Jul 19, 9:30 AM CDT	TSTM WND DMG	3 Ne Ronneby, MN	BRANCHES AND LIMBS UP TO 10 INCHES IN DIAMETER DOWNED IN OAK PARK.
Jul 19, 9:41 AM CDT	TSTM WND DMG	1 W Foreston, MN	A FEW LARGE TREES FELLED.
Jul 19, 9:45 AM CDT	TSTM WND DMG	Foreston, MN	SEVERAL TWO FOOT DIAMETER TREES EITHER UPROOTED OR SPLIT IN TWO.A FEW SCREEN DOORS RIPPED OFF HOUSES.
Jul 19, 10:05 AM CDT	TSTM WND DMG	Milaca, MN	SEVERAL TREES DOWN...POWER OUT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 1.9 hours before the alert went out and 101 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.

099 
WUUS53 KMPX 191353
SVRMPX
MNC009-095-097-191515-
/O.NEW.KMPX.SV.W.0159.110719T1353Z-110719T1515Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN BENTON COUNTY IN CENTRAL MINNESOTA...
  SOUTHERN MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHEASTERN MORRISON COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1015 AM CDT

* AT 850 AM 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 PIERZ...OR
  ABOUT 14 MILES EAST OF LITTLE FALLS...AND MOVING SOUTHEAST AT 20
  MPH.

LOCATIONS IN THE WARNING INCLUDE...
  MILACA...
  BUCKMAN...
  LITTLE ROCK...
  MORRILL...
  MAYHEW...
  GILMAN...
  PARENT...
  FOLEY...
  RONNEBY...
  FORESTON...
  PEASE...

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.

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 4577 9352 4565 9368 4556 9400 4593 9422
      4582 9368
TIME...MOT...LOC 1353Z 320DEG 19KT 4595 9405
WIND...HAIL 65MPH 1.75IN

$$

2 follow-up statements

824 
WWUS53 KMPX 191421
SVSMPX

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

MNC009-095-097-191515-
/O.CON.KMPX.SV.W.0159.000000T0000Z-110719T1515Z/
BENTON MN-MILLE LACS MN-MORRISON MN-
921 AM CDT TUE JUL 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
MORRISON...SOUTHERN MILLE LACS AND BENTON COUNTIES UNTIL 1015 AM
CDT...

AT 918 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL...AND
DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED NEAR
MORRILL...OR 15 MILES NORTHWEST OF MILACA...MOVING SOUTHEAST AT 20
MPH.

LOCATIONS IMPACTED INCLUDE...
  MILACA...MAYHEW...GILMAN...PARENT...FOLEY...RONNEBY...FORESTON...
  PEASE AND RUM RIVER.

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 4577 9352 4565 9368 4556 9400 4588 9419
      4590 9407 4582 9368
TIME...MOT...LOC 1421Z 320DEG 19KT 4584 9391
WIND...HAIL 70MPH 1.25IN

$$

352 
WWUS53 KMPX 191448
SVSMPX

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

MNC009-095-097-191515-
/O.CON.KMPX.SV.W.0159.000000T0000Z-110719T1515Z/
BENTON MN-MILLE LACS MN-MORRISON MN-
948 AM CDT TUE JUL 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
MORRISON...SOUTHERN MILLE LACS AND EASTERN BENTON COUNTIES UNTIL 1015
AM CDT...

ADDITIONAL SEVERE THUNDERSTORM WARNINGS ARE IN EFFECT FOR OTHER 
PORTIONS OF THE AREA.

AT 945 AM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR FORESTON...OR
6 MILES WEST OF MILACA...MOVING SOUTHEAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  MILACA AND PEASE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4577 9352 4565 9368 4556 9400 4576 9412
      4587 9391 4582 9368
TIME...MOT...LOC 1447Z 320DEG 33KT 4571 9376
WIND...HAIL 60MPH 1.00IN

$$

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, 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, 10:09 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Sherburne	36 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.