Alert archive / Minnesota / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 54, NWS Twin Cities, MN

June 29, 2015Anoka County, Isanti County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 29, 2015, 6:02 PM CDT for Anoka County, Isanti County, Minnesota. It was in force for 43 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: Jun 29, 2015, 6:02 PM CDT (23:02 UTC)
Expired: Jun 29, 2015, 6:45 PM CDT
In force: 43 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.75 in
Wind: 50.0 mph

Counties Anoka County, MN, Isanti County, MN

The radar

The Minneapolis radar (KMPX), 66 km from the middle of the area, began a volume at 23:02 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
Jun 29, 6:16 PM CDT	HAIL 0.88	East Bethel, MN
Jun 29, 6:30 PM CDT	HAIL 1	5 E Ham Lake, MN	OCCURRED IN COLUMBUS.
Jun 29, 6:37 PM CDT	HAIL 1.5	2 Ese Ham Lake, MN
Jun 29, 6:50 PM CDT	HAIL 1.5	Lilydale, 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
Jun 29, 1:57 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.0 hours before the alert went out and 67 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: 160 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1297 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

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

599 
WUUS53 KMPX 292302
SVRMPX
MNC003-059-292345-
/O.NEW.KMPX.SV.W.0054.150629T2302Z-150629T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
602 PM CDT MON JUN 29 2015

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN ISANTI COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN ANOKA COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 645 PM CDT

* AT 602 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED OVER WEBER...OR 8
  MILES SOUTHEAST OF CAMBRIDGE...MOVING SOUTH AT 20 MPH.

  HAZARD...GOLF BALL SIZE HAIL. 

  SOURCE...RADAR INDICATED. 

  IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT 
           DAMAGE TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

* THIS SEVERE THUNDERSTORM WILL BE NEAR...
  EAST BETHEL AROUND 610 PM CDT.
  HAM LAKE AROUND 635 PM CDT.
  BLAINE AND LINO LAKES AROUND 645 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE WEBER...
CENTERVILLE AND OAK GROVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4549 9322 4546 9302 4517 9308 4524 9332
TIME...MOT...LOC 2302Z 008DEG 18KT 4544 9313 

HAIL...1.75IN
WIND...<50MPH
 
$$

BORGHOFF

1 follow-up statement

419 
WWUS53 KMPX 292317
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
617 PM CDT MON JUN 29 2015

MNC059-292327-
/O.CAN.KMPX.SV.W.0054.000000T0000Z-150629T2345Z/
ISANTI MN-
617 PM CDT MON JUN 29 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ISANTI COUNTY IS
CANCELLED...
    
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF  
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT FOR
EAST CENTRAL MINNESOTA.

LAT...LON 4539 9304 4517 9308 4524 9332 4541 9320
      4541 9317
TIME...MOT...LOC 2317Z 352DEG 29KT 4533 9311 

$$

MNC003-292345-
/O.CON.KMPX.SV.W.0054.000000T0000Z-150629T2345Z/
ANOKA MN-
617 PM CDT MON JUN 29 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHEASTERN ANOKA COUNTY...

AT 617 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED NEAR EAST BETHEL...
OR 15 MILES SOUTHEAST OF CAMBRIDGE...MOVING SOUTH AT 35 MPH.

HAZARD...GOLF BALL SIZE HAIL. 

SOURCE...RADAR INDICATED. 

IMPACT...PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE 
         TO ROOFS...SIDING...WINDOWS AND VEHICLES. 

THIS SEVERE STORM WILL BE NEAR...
  HAM LAKE AROUND 620 PM CDT.
  BLAINE AND LINO LAKES AROUND 630 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS SEVERE THUNDERSTORM INCLUDE
CENTERVILLE AND OAK GROVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4539 9304 4517 9308 4524 9332 4541 9320
      4541 9317
TIME...MOT...LOC 2317Z 352DEG 29KT 4533 9311 

HAIL...1.75IN
WIND...<50MPH
 
$$

BORGHOFF

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 29, 1:19 PM CDT	Special Weather Statement	MPX	Mille Lacs	26 min
Jun 29, 3:12 PM CDT	Special Weather Statement	MPX	Hennepin	33 min
Jun 29, 3:19 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Wright	56 min
Jun 29, 3:56 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin	64 min
Jun 29, 4:28 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Scott	47 min
Jun 29, 5:00 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti	60 min
Jun 29, 5:32 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Chisago, Washington	58 min
Jun 29, 6:28 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Ramsey, Washington	47 min
Jun 29, 6:48 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Ramsey	42 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.