Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 15, NWS Twin Cities, MN

May 1, 2012Isanti County, Sherburne County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 1, 2012, 6:14 PM CDT for Isanti County, Sherburne County, Minnesota. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 1, 2012, 6:14 PM CDT (23:14 UTC)
Expired: May 1, 2012, 7:00 PM CDT
In force: 46 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Isanti County, MN, Sherburne County, MN

The radar

The Minneapolis radar (KMPX), 76 km from the middle of the area, began a volume at 23:18 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 1, 2:59 PM CDT	Tornado Watch	SPC	6 hr
May 1, 6:10 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.2 hours before the alert went out and 76 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1291 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

704 
WUUS53 KMPX 012314
SVRMPX
MNC059-141-020000-
/O.NEW.KMPX.SV.W.0015.120501T2314Z-120502T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
614 PM CDT TUE MAY 1 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 608 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED NEAR ZIMMERMAN...OR ABOUT 8 MILES SOUTH OF
  PRINCETON...AND MOVING EAST AT 25 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CAMBRIDGE...
  ZIMMERMAN...
  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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1000 PM CDT TUESDAY EVENING
FOR SOUTHERN MINNESOTA. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL
100 AM CDT WEDNESDAY MORNING FOR SOUTHEASTERN MINNESOTA AND
NORTHWESTERN WISCONSIN.

&&

LAT...LON 4568 9324 4544 9311 4541 9331 4542 9351
      4541 9363 4551 9372 4556 9352 4560 9351
TIME...MOT...LOC 2314Z 252DEG 23KT 4547 9359
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

126 
WWUS53 KMPX 012335
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
635 PM CDT TUE MAY 1 2012

MNC141-012350-
/O.CAN.KMPX.SV.W.0015.000000T0000Z-120502T0000Z/
SHERBURNE MN-
635 PM CDT TUE MAY 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SHERBURNE COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE
WARNED AREA. HOWEVER... A SEPARATE TORNADO WARNING REMAINS IN EFFECT
FOR NORTHWEST SHERBURNE COUNTY UNTIL 7 PM CDT.

LAT...LON 4568 9324 4544 9311 4541 9329 4542 9331
      4541 9338 4542 9351 4557 9352 4560 9351
TIME...MOT...LOC 2335Z 252DEG 23KT 4551 9341

$$

MNC059-020000-
/O.CON.KMPX.SV.W.0015.000000T0000Z-120502T0000Z/
ISANTI MN-
635 PM CDT TUE MAY 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR ISANTI COUNTY
UNTIL 700 PM CDT...

AT 631 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS OF 60 MPH.  THIS STORM WAS LOCATED 8 MILES NORTHEAST OF
ZIMMERMAN...OR 9 MILES SOUTHEAST OF PRINCETON...MOVING EAST AT 25
MPH.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH 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 4568 9324 4544 9311 4541 9329 4542 9331
      4541 9338 4542 9351 4557 9352 4560 9351
TIME...MOT...LOC 2335Z 252DEG 23KT 4551 9341
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
May 1, 4:41 AM CDT	Special Weather Statement	MPX	Douglas, Morrison, Pope, Stevens, Todd	79 min
May 1, 4:12 PM CDT	Severe Thunderstorm Warning	MPX	Pope, Stearns	33 min
May 1, 4:40 PM CDT	Severe Thunderstorm Warning	MPX	Sherburne, Stearns, Wright	35 min
May 1, 4:43 PM CDT	Severe Thunderstorm Warning	MPX	Pope, Stearns	47 min
May 1, 4:46 PM CDT	Tornado Warning	MPX	Pope, Stearns	44 min
May 1, 5:07 PM CDT	Tornado Warning	MPX	Sherburne, Stearns, Wright	38 min
May 1, 5:08 PM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Yellow Medicine	67 min
May 1, 5:09 PM CDT	Tornado Warning	MPX	Stearns	36 min
May 1, 5:17 PM CDT	Severe Thunderstorm Warning	MPX	Redwood, Yellow Medicine	32 min
May 1, 5:23 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison, Stearns	37 min
May 1, 5:38 PM CDT	Tornado Warning	MPX	Sherburne	37 min
May 1, 5:44 PM CDT	Tornado Warning	MPX	Benton, Sherburne, Stearns	46 min
May 1, 6:08 PM CDT	Severe Thunderstorm Warning	MPX	Redwood	52 min
May 1, 6:25 PM CDT	Tornado Warning	MPX	Benton, Sherburne	35 min
May 1, 6:43 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	62 min
May 1, 6:56 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Mille Lacs, Sherburne	34 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.