Alert archive / Minnesota / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 76, NWS Twin Cities, MN

July 12, 2015Chisago County, Isanti County, Minnesota; Polk County, Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 12, 2015, 9:24 PM CDT for Chisago County, Isanti County, Minnesota; Polk County, Wisconsin. It was in force for 51 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: Jul 12, 2015, 9:24 PM CDT (02:24 UTC)
Expired: Jul 12, 2015, 10:15 PM CDT
In force: 51 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Chisago County, MN, Isanti County, MN, Polk County, WI

The radar

The Minneapolis radar (KMPX), 93 km from the middle of the area, began a volume at 02:27 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 12, 9:55 PM CDT	TSTM WND DMG	1 E North Branch, MN	TREES DOWN
Jul 12, 9:55 PM CDT	TSTM WND DMG	Branch, MN	TREES 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
Jul 12, 5:28 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.4 hours before the alert went out and 94 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: 3598 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 12.7

Open this sounding in Storm Lab

The text

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

694 
WUUS53 KMPX 130224
SVRMPX
MNC025-059-WIC095-130315-
/O.NEW.KMPX.SV.W.0076.150713T0224Z-150713T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
924 PM CDT SUN JUL 12 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  WESTERN POLK COUNTY IN NORTHWESTERN WISCONSIN...

* UNTIL 1015 PM CDT

* AT 923 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER BRAHAM...OR
  11 MILES NORTH OF CAMBRIDGE...MOVING SOUTHEAST AT 25 MPH.

  HAZARD...60 MPH WIND GUSTS AND NICKEL SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...EXPECT DAMAGE TO ROOFS...SIDING AND TREES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  RUSH CITY AROUND 950 PM CDT.
  NORTH BRANCH AROUND 1005 PM CDT.
  CHISAGO CITY AROUND 1015 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
STANCHFIELD...BRANCH...WOLF CREEK...WILD RIVER STATE PARK...GRANDY...
ATHENS...HARRIS...SPRING LAKE...BODUM AND CUSHING.

THIS INCLUDES INTERSTATE 35 BETWEEN MILE MARKERS 134 AND 163.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
BUILDING.

TORRENTIAL RAINFALL IS OCCURRING WITH THIS STORM...AND MAY LEAD TO
FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FOR EAST CENTRAL
MINNESOTA AND NORTHWESTERN WISCONSIN.

LAT...LON 4572 9287 4564 9288 4564 9254 4530 9263
      4531 9301 4541 9302 4541 9330 4554 9338
      4574 9313 4573 9285
TIME...MOT...LOC 0223Z 312DEG 20KT 4571 9319 

HAIL...0.88IN
WIND...60MPH
 
$$

DWE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 7:00 PM CDT	Tornado Warning	MPX	Morrison, Todd	45 min
Jul 12, 7:09 PM CDT	Tornado Warning	MPX	Pope, Stevens	36 min
Jul 12, 7:18 PM CDT	Tornado Warning	MPX	Morrison, Todd	42 min
Jul 12, 7:20 PM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stearns, Todd	70 min
Jul 12, 7:30 PM CDT	Special Weather Statement	MPX	Douglas	3 hr
Jul 12, 7:39 PM CDT	Tornado Warning	MPX	Douglas	30 min
Jul 12, 7:40 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison, Stearns	50 min
Jul 12, 7:42 PM CDT	Tornado Warning	MPX	Pope	48 min
Jul 12, 8:16 PM CDT	Severe Thunderstorm Warning	MPX	Stearns	44 min
Jul 12, 8:24 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison, Sherburne	51 min
Jul 12, 8:27 PM CDT	Severe Thunderstorm Warning	MPX	Pope	33 min
Jul 12, 8:32 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec, Mille Lacs	28 min
Jul 12, 8:40 PM CDT	Special Weather Statement	MPX	Douglas	35 min
Jul 12, 8:54 PM CDT	Severe Thunderstorm Warning	MPX	Isanti, Kanabec, Mille Lacs	51 min
Jul 12, 8:54 PM CDT	Severe Thunderstorm Warning	MPX	Meeker, Stearns, Wright	81 min
Jul 12, 8:59 PM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, Pope, Stearns	46 min
Jul 12, 8:59 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Benton, Isanti, Sherburne	61 min
Jul 12, 9:03 PM CDT	Special Weather Statement	MPX	Chippewa	27 min
Jul 12, 9:31 PM CDT	Special Weather Statement	MPX	Kandiyohi	29 min
Jul 12, 9:48 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Wright	57 min
Jul 12, 9:48 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Isanti, Ramsey, Washington	57 min
Jul 12, 10:32 PM CDT	Severe Thunderstorm Warning	MPX	Meeker, Stearns, Wright	26 min
Jul 12, 10:45 PM CDT	Special Weather Statement	MPX	Carver, Hennepin, McLeod, Ramsey, Washington, Wright	60 min
Jul 12, 10:55 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin, Wright	35 min
Jul 12, 11:18 PM CDT	Special Weather Statement	MPX	Douglas	57 min
Jul 12, 11:18 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Scott	19 min
Jul 12, 11:40 PM CDT	Special Weather Statement	MPX	Dakota, Goodhue, Le Sueur, Rice, Scott	50 min
Jul 13, 12:29 AM CDT	Special Weather Statement	MPX	Todd	46 min
Jul 13, 12:41 AM CDT	Special Weather Statement	MPX	Goodhue	64 min
Jul 13, 1:23 AM CDT	Special Weather Statement	MPX	Sherburne	52 min
Jul 13, 2:47 AM CDT	Special Weather Statement	MPX	Washington	58 min
Jul 12, 9:59 PM CDT	Severe Thunderstorm Warning	MPX	Polk, Saint Croix	61 min
Jul 12, 10:18 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Dunn	57 min
Jul 12, 11:26 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Chippewa, Dunn, Rusk	49 min
Jul 13, 12:03 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire	42 min
Jul 13, 12:17 AM CDT	Special Weather Statement	MPX	Rusk	28 min
Jul 13, 12:37 AM CDT	Special Weather Statement	MPX	Eau Claire	23 min
Jul 13, 2:56 PM CDT	Special Weather Statement	MPX	Polk	34 min
Jul 13, 3:00 PM CDT	Severe Thunderstorm Warning	MPX	Polk	45 min
Jul 13, 3:49 PM CDT	Special Weather Statement	MPX	Polk	41 min
Jul 13, 4:03 PM CDT	Severe Thunderstorm Warning	MPX	Polk	21 min
Jul 13, 4:13 PM CDT	Severe Thunderstorm Warning	MPX	Polk	28 min
Jul 13, 4:36 PM CDT	Special Weather Statement	MPX	Dunn	39 min
Jul 13, 5:25 PM CDT	Special Weather Statement	MPX	Eau Claire	20 min
Jul 13, 5:41 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Saint Croix	31 min
Jul 13, 6:03 PM CDT	Severe Thunderstorm Warning	MPX	Dunn, Pepin	31 min
Jul 13, 6:22 PM CDT	Severe Thunderstorm Warning	MPX	Eau Claire	23 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2015 Severe Thunderstorm Warnings in Wisconsin, 2015 Every severe thunderstorm warning in 2015

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.