Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 203, NWS Twin Cities, MN

July 1, 2012Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 1, 2012, 4:02 PM CDT for Sibley County, Minnesota. It was in force for 28 min. 1 report 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 1, 2012, 4:02 PM CDT (21:02 UTC)
Expired: Jul 1, 2012, 4:30 PM CDT
In force: 28 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Sibley County, MN

The radar

The Minneapolis radar (KMPX), 83 km from the middle of the area, began a volume at 21:04 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 1, 4:15 PM CDT	HAIL 1.25	Sse Gibbon, MN	HAILED FOR SEVERAL MINUTES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.0 hours before the alert went out and 80 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: 1200 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1457 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 62 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.

025 
WUUS53 KMPX 012102
SVRMPX
MNC143-012130-
/O.NEW.KMPX.SV.W.0203.120701T2102Z-120701T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
402 PM CDT SUN JUL 1 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 430 PM CDT

* AT 359 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 60 MPH. THIS
  STORM WAS LOCATED NEAR GIBBON...OR ABOUT 16 MILES WEST OF
  GAYLORD...AND MOVING NORTH AT 15 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  GIBBON...

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.

&&

LAT...LON 4465 9462 4462 9441 4447 9443 4449 9461
TIME...MOT...LOC 2102Z 187DEG 12KT 4456 9455
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
Jul 1, 2:38 PM CDT	Special Weather Statement	MPX	Martin	52 min
Jul 1, 2:55 PM CDT	Special Weather Statement	MPX	Brown	35 min
Jul 1, 2:59 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Nicollet, Renville, Sibley	31 min
Jul 1, 3:54 PM CDT	Special Weather Statement	MPX	Sibley	36 min
Jul 1, 4:14 PM CDT	Heat Advisory	MPX	Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more	37 hr
Jul 1, 4:52 PM CDT	Special Weather Statement	MPX	Renville	23 min
Jul 1, 5:14 PM CDT	Special Weather Statement	MPX	Renville	31 min
Jul 1, 5:18 PM CDT	Severe Thunderstorm Warning	MPX	Renville	27 min
Jul 1, 5:36 PM CDT	Special Weather Statement	MPX	Kanabec	24 min
Jul 1, 5:47 PM CDT	Severe Thunderstorm Warning	MPX	Kanabec	28 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.