Alert archive / Minnesota / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 102, NWS Twin Cities, MN

July 17, 20157 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 17, 2015, 11:44 PM CDT for 7 counties in Minnesota. It was in force for 46 min. 11 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 17, 2015, 11:44 PM CDT (04:44 UTC)
Expired: Jul 18, 2015, 12:30 AM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Brown County, MN, Carver County, MN, Le Sueur County, MN, McLeod County, MN, Nicollet County, MN, Scott County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 56 km from the middle of the area, began a volume at 04:46 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
Jul 17, 11:55 PM CDT	TSTM WND DMG	4 Nnw Norwood/Young Ame, MN	ROOF OFF OF A HOUSE ON VEGA AVE.
Jul 17, 11:58 PM CDT	TORNADO 1	4 Wsw Watertown, MN	SIGNIFICANT TREE DAMAGE AND DAMAGE TO SEVERAL STRUCTURES. UPDATED TO INCLUDE EF-1 RATING.
Jul 17, 11:59 PM CDT	TORNADO	4 Wsw Watertown, MN	CARS FLIPPED AND STRUCTURAL DAMAGE REPORTED. DUAL POL RADAR OBSERVED TORNADO FOR 2 TO 3 MINUTES BEFORE WEAKENING. TORNADO HEADED EAST NORTHEAST. EXTENT OF DAMAGE UNKNOWN.
Jul 17, 11:59 PM CDT	TORNADO	4 Wsw Watertown, MN	RADAR OBSERVED TORNADO FOR 2 TO 3 MINUTES BEFORE WEAKENING. TORNADO HEADED EAST NORTHEAST. EXTENT OF DAMAGE UNKNOWN.
Jul 18, 12:00 AM CDT	TSTM WND GST 68	Hamburg, MN	VIA WUNDERGROUND/THE WEATHER CHANNEL.
Jul 18, 12:02 AM CDT	TSTM WND DMG	Watertown, MN	POWER LINES AND MANY TREES TOPPLED IN THE CITY.
Jul 18, 12:12 AM CDT	TSTM WND DMG	2 Nw St Bonifacius, MN	SIX INCH DIAMETER TREE BRANCH DOWN. OCCURRED ON NIKE ROAD. TIME ESTIMATED.
Jul 18, 12:22 AM CDT	TSTM WND GST 56	Shakopee, MN	MEASURED WITH ANEMOMETER.
Jul 18, 12:23 AM CDT	TSTM WND DMG	Waconia, MN	HUGE TREE LIMBS SMASHED VEHICLES IN TOWN. REPORT VIA TWITTER.
Jul 18, 12:30 AM CDT	TSTM WND DMG	2 W Prior Lake, MN	SEVERAL TREES WERE BLOWN DOWN WEST OF PRIOR LAKE, TWO TREES HAD A DIAMETER OF 2-3 FEET. OTHER AREAS OF PRIOR LAKE AND NORTHWEST TOWARD SHAKOPEE HAD SPORADIC LARGE BRANCHES BLOWN DOWN ALONG COUNTY ROAD 17.
Jul 18, 12:33 AM CDT	TSTM WND DMG	Waconia, MN	UPROOTED TREES IN TOWN. REPORTED VIA TWITTER.

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 17, 8:39 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.7 hours before the alert went out and 54 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: 888 J/kg
Mixed-layer CIN: -162 J/kg
Mixed-layer LCL: 1752 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

218 
WUUS53 KMPX 180444
SVRMPX
MNC015-019-079-085-103-139-143-180530-
/O.NEW.KMPX.SV.W.0102.150718T0444Z-150718T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1144 PM CDT FRI JUL 17 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MCLEOD COUNTY IN CENTRAL MINNESOTA...
  SCOTT COUNTY IN EAST CENTRAL MINNESOTA...
  SIBLEY COUNTY IN CENTRAL MINNESOTA...
  CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN BROWN COUNTY IN SOUTH CENTRAL MINNESOTA...
  NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA...
  NORTHWESTERN LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 1230 AM CDT

* AT 1144 PM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM SILVER LAKE TO NEAR NEW AUBURN TO NEAR EVAN...MOVING
  EAST AT 45 MPH.

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

  SOURCE...RADAR INDICATED. 

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

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WINSTED...GAYLORD AND SILVER LAKE AROUND 1150 PM CDT.
  ARLINGTON AND LESTER PRAIRIE AROUND 1155 PM CDT.
  GREEN ISLE AROUND 1200 AM CDT.
  NEW ULM...WATERTOWN...NORWOOD YOUNG AMERICA AND MAYER AROUND 1205
  AM CDT.
  WACONIA...HENDERSON AND LAFAYETTE AROUND 1210 AM CDT.
  BELLE PLAINE AND COLOGNE AROUND 1215 AM CDT.
  CHASKA...CHANHASSEN...VICTORIA AND COURTLAND AROUND 1220 AM CDT.
  JORDAN AND CARVER AROUND 1225 AM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
NORSELAND...MARYSTOWN...KLOSSNER...ST BENEDICT...NEW GERMANY...NEW
ROME...ESSIG...EVAN...HAMBURG AND LAKE WACONIA.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 U.S. HIGHWAY 14 BETWEEN MILE MARKERS 93 AND 125.
 U.S. HIGHWAY 169 BETWEEN MILE MARKERS 58 AND 116.
 U.S. HIGHWAY 212 BETWEEN MILE MARKERS 110 AND 154.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4426 9436 4434 9487 4443 9486 4446 9478
      4445 9463 4454 9463 4466 9437 4498 9426
      4498 9377 4489 9376 4489 9352 4481 9352
      4480 9340 4454 9349 4424 9395 4424 9401
      4419 9405
TIME...MOT...LOC 0444Z 279DEG 39KT 4491 9419 4466 9427 4439 9482 

HAIL...0.75IN
WIND...60MPH
 
$$

1 follow-up statement

263 
WWUS53 KMPX 180520
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1220 AM CDT SAT JUL 18 2015

MNC015-085-180530-
/O.CAN.KMPX.SV.W.0102.000000T0000Z-150718T0530Z/
MCLEOD MN-BROWN MN-
1220 AM CDT SAT JUL 18 2015

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MCLEOD AND
NORTHEASTERN BROWN COUNTIES IS CANCELLED...

THE STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 200 AM CDT FOR
SOUTHEASTERN MINNESOTA.

LAT...LON 4427 9442 4431 9444 4472 9400 4498 9387
      4498 9377 4489 9376 4489 9352 4481 9352
      4480 9340 4454 9349 4454 9351 4451 9353
      4424 9395 4424 9401 4419 9405
TIME...MOT...LOC 0520Z 283DEG 44KT 4485 9357 4450 9364 4423 9418 

$$

MNC019-079-103-139-143-180530-
/O.CON.KMPX.SV.W.0102.000000T0000Z-150718T0530Z/
SCOTT MN-SIBLEY MN-CARVER MN-NICOLLET MN-LE SUEUR MN-
1220 AM CDT SAT JUL 18 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR SCOTT...EASTERN SIBLEY...CARVER...NICOLLET AND NORTHWESTERN LE
SUEUR COUNTIES...

AT 1220 AM CDT...SEVERE THUNDERSTORMS WERE LOCATED ALONG A LINE
EXTENDING FROM CHANHASSEN TO HEIDELBERG TO NEAR JUDSON...MOVING EAST
AT 50 MPH.

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

SOURCE...RADAR INDICATED. 

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

THESE SEVERE STORMS WILL BE NEAR...
  EDEN PRAIRIE...CHASKA...CHANHASSEN...NEW PRAGUE AND CARVER AROUND
1225 AM CDT.
  SHAKOPEE...PRIOR LAKE AND KASOTA AROUND 1230 AM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
NORSELAND...MARYSTOWN...ST THOMAS...RUSH RIVER...ST BENEDICT...ST
HENRY...NEW ROME...MN VALLEY STATE REC AREA...HAMBURG AND LAKE
WACONIA.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
 U.S. HIGHWAY 14 BETWEEN MILE MARKERS 105 AND 125.
 U.S. HIGHWAY 169 BETWEEN MILE MARKERS 58 AND 116.
 U.S. HIGHWAY 212 BETWEEN MILE MARKERS 130 AND 154.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4427 9442 4431 9444 4472 9400 4498 9387
      4498 9377 4489 9376 4489 9352 4481 9352
      4480 9340 4454 9349 4454 9351 4451 9353
      4424 9395 4424 9401 4419 9405
TIME...MOT...LOC 0520Z 283DEG 44KT 4485 9357 4450 9364 4423 9418 

HAIL...0.75IN
WIND...60MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 8:48 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift, Yellow Medicine	57 min
Jul 17, 8:57 PM CDT	Severe Thunderstorm Warning	MPX	Stevens, Swift	63 min
Jul 17, 9:28 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Pope, Stevens, Swift	47 min
Jul 17, 9:44 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Lac qui Parle, Swift	61 min
Jul 17, 10:17 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Renville, Yellow Medicine	28 min
Jul 17, 10:30 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Meeker, Stearns	45 min
Jul 17, 10:41 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Renville, Yellow Medicine	34 min
Jul 17, 11:03 PM CDT	Severe Thunderstorm Warning	MPX	Brown, McLeod, Nicollet, Redwood, Renville, Sibley	42 min
Jul 17, 11:09 PM CDT	Severe Thunderstorm Warning	MPX	McLeod, Meeker, Stearns, Wright	51 min
Jul 17, 11:52 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Sherburne, Wright	38 min
Jul 18, 12:01 AM CDT	Tornado Warning	MPX	Carver, Hennepin, Wright	29 min
Jul 18, 12:26 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Dakota, Hennepin, Ramsey, Sherburne, Washington and 1 more	49 min
Jul 18, 12:29 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Le Sueur, Rice, Scott	31 min
Jul 18, 12:55 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice, Steele, Waseca, Washington	50 min
Jul 18, 1:06 AM CDT	Severe Thunderstorm Warning	MPX	Chisago, Washington	39 min
Jul 18, 1:25 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Renville, Yellow Medicine	34 min
Jul 18, 1:27 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	48 min
Jul 18, 1:42 AM CDT	Special Weather Statement	MPX	Anoka, Dakota, Hennepin, Ramsey	63 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.