Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 161, NWS Twin Cities, MN

July 19, 20115 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 19, 2011, 9:45 AM CDT for 5 counties in Minnesota. It was in force for 60 min. 6 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, 9:45 AM CDT (14:45 UTC)
Expired: Jul 19, 2011, 10:45 AM CDT
In force: 60 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 65.0 mph

Counties Benton County, MN, Isanti County, MN, Kanabec County, MN, Mille Lacs County, MN, Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 87 km from the middle of the area, began a volume at 14:45 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, 10:13 AM CDT	TSTM WND GST 56	Princeton, MN	MEASURED AT PRINCETON AIRPORT.
Jul 19, 10:17 AM CDT	TSTM WND DMG	Princeton, MN	SEVERAL TREES AND POWERLINES DOWN.
Jul 19, 10:18 AM CDT	TSTM WND DMG	Princeton, MN	SEVERAL LARGE TREES DOWN, INCLUDING EVERGREENS. OCCURRED NEAR 12917 STATE HIGHWAY 95.
Jul 19, 10:19 AM CDT	TSTM WND GST 58	Princeton, MN	MEASURED AT AIRPORT
Jul 19, 10:20 AM CDT	TSTM WND DMG	Zimmerman, MN	TWENTY FOUR INCH DIAMETER TREES TOPPLED. SOME SNAPPED IN TWO. OCCURRED NEAR 25019 JARVIS ST. IN ZIMMERMAN.
Jul 19, 10:20 AM CDT	TSTM WND GST 47	3 Sse Glendorado, MN	MEASURED BY RAWS AT SHERBURN NATIONAL WILDLIFE REFUGE

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
Jul 19, 9:07 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 2.8 hours before the alert went out and 87 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.

981 
WUUS53 KMPX 191445
SVRMPX
MNC009-059-065-095-141-191545-
/O.NEW.KMPX.SV.W.0161.110719T1445Z-110719T1545Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BENTON COUNTY IN CENTRAL MINNESOTA...
  ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHWESTERN KANABEC COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN MILLE LACS COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN SHERBURNE COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1045 AM CDT

* AT 941 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 FORESTON...OR ABOUT 6 MILES SOUTHWEST
  OF MILACA...AND MOVING SOUTHEAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  PRINCETON...
  CAMBRIDGE...
  SANTIAGO...
  GLENDORADO...
  LEWIS LAKE...
  DALBO...
  ZIMMERMAN...
  GRASSTON...
  BRAHAM...
  STANCHFIELD...
  GRANDY...
  ISANTI...
  BODUM...

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.

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 4580 9315 4542 9314 4542 9384 4556 9400
      4566 9369 4577 9352
TIME...MOT...LOC 1445Z 303DEG 28KT 4567 9369
WIND...HAIL 65MPH 1.00IN

$$

1 follow-up statement

543 
WWUS53 KMPX 191522
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1022 AM CDT TUE JUL 19 2011

MNC009-065-191537-
/O.CAN.KMPX.SV.W.0161.000000T0000Z-110719T1545Z/
BENTON MN-KANABEC MN-
1022 AM CDT TUE JUL 19 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN KANABEC AND
SOUTHEASTERN BENTON COUNTIES IS CANCELLED...

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

LAT...LON 4556 9315 4542 9314 4542 9384 4556 9377
      4563 9367 4570 9352 4573 9333
TIME...MOT...LOC 1522Z 325DEG 35KT 4551 9348

$$

MNC059-095-141-191545-
/O.CON.KMPX.SV.W.0161.000000T0000Z-110719T1545Z/
ISANTI MN-MILLE LACS MN-SHERBURNE MN-
1022 AM CDT TUE JUL 19 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
SHERBURNE...SOUTH CENTRAL MILLE LACS AND ISANTI COUNTIES UNTIL 1045
AM CDT...

AT 1017 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 PRINCETON...
MOVING SOUTHEAST AT 40 MPH.

IN ADDITION...AT 1019 AM CDT 60 MPH WINDS WERE REPORTED IN PRINCETON 
WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  CAMBRIDGE...BODUM...ISANTI AND ATHENS.

LAT...LON 4556 9315 4542 9314 4542 9384 4556 9377
      4563 9367 4570 9352 4573 9333
TIME...MOT...LOC 1522Z 325DEG 35KT 4551 9348
WIND...HAIL 60MPH 1.00IN

$$

RAH

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, 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.