Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 50, NWS Twin Cities, MN

May 4, 2012Martin County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 4, 2012, 4:32 PM CDT for Martin County, Minnesota. It was in force for 13 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 4, 2012, 4:32 PM CDT (21:32 UTC)
Expired: May 4, 2012, 4:45 PM CDT
In force: 13 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Martin County, MN

The radar

The Minneapolis radar (KMPX), 160 km from the middle of the area, began a volume at 21:35 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 4, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.5 hours before the alert went out and 159 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: 1101 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: -52 m²/s²
0-3 km storm-relative helicity: 15 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.

823 
WUUS53 KMPX 042132
SVRMPX
MNC091-042145-
/O.NEW.KMPX.SV.W.0050.120504T2132Z-120504T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
432 PM CDT FRI MAY 4 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL MARTIN COUNTY IN SOUTH CENTRAL MINNESOTA...

* UNTIL 445 PM CDT

* AT 430 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 5 MILES
  NORTHEAST OF CEYLON...OR ABOUT 7 MILES SOUTHWEST OF FAIRMONT...AND
  MOVING EAST AT 20 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CEYLON AND RURAL SOUTHER MARTIN COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM
WINDOWS.

&&

LAT...LON 4368 9451 4351 9445 4350 9467 4366 9472
TIME...MOT...LOC 2132Z 268DEG 16KT 4357 9454
WIND...HAIL <50MPH 1.00IN

$$

BAP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 3, 7:00 PM CDT	Special Weather Statement	MPX	Goodhue	30 min
May 4, 2:07 PM CDT	Special Weather Statement	MPX	Redwood	38 min
May 4, 2:33 PM CDT	Special Weather Statement	MPX	Blue Earth, Martin, Watonwan	57 min
May 4, 3:10 PM CDT	Tornado Warning	MPX	Martin	35 min
May 4, 3:40 PM CDT	Tornado Warning	MPX	Martin	50 min
May 4, 4:07 PM CDT	Special Weather Statement	MPX	Blue Earth, Waseca, Watonwan	38 min
May 4, 4:22 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Martin	38 min
May 4, 5:00 PM CDT	Special Weather Statement	MPX	Faribault	45 min
May 4, 5:41 PM CDT	Severe Thunderstorm Warning	MPX	Faribault, Freeborn	49 min
May 4, 5:52 PM CDT	Tornado Warning	MPX	Faribault, Freeborn	23 min
May 4, 6:15 PM CDT	Severe Thunderstorm Warning	MPX	Freeborn	45 min
May 4, 6:21 PM CDT	Tornado Warning	MPX	Freeborn	24 min
May 4, 6:24 PM CDT	Areal Flood Advisory	MPX	Blue Earth, Faribault, Martin, Watonwan	3 hr

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.