Alert archive / Wisconsin / Mesoscale Discussions in 2012

Mesoscale Discussion 945

May 28, 20126 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 28, 2012, 6:28 PM CDT for 6 counties in Wisconsin. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued: May 28, 2012, 6:28 PM CDT (23:28 UTC)
Expired: May 28, 2012, 7:30 PM CDT
In force: 62 min
Issued by: the Storm Prediction Center

Counties Barron County, WI, Chippewa County, WI, Dunn County, WI, Rusk County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 153 km from the middle of the area, began a volume at 23:28 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.5 hours before the alert went out and 187 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: 60 J/kg
Mixed-layer CIN: -27 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

943 
ACUS11 KWNS 282329
SWOMCD
SPC MCD 282328
WIZ000-290030-

MESOSCALE DISCUSSION 0945
NWS STORM PREDICTION CENTER NORMAN OK
0628 PM CDT MON MAY 28 2012

AREAS AFFECTED...NWRN WI

CONCERNING...SEVERE THUNDERSTORM WATCH 309...

VALID 282328Z - 290030Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 309
CONTINUES.

SUMMARY...SOME THREAT FOR ISOLATED DAMAGING WIND AND HAIL WILL
PERSIST OVER NWRN WI UNTIL WW EXPIRATION TIME OF 01Z. HOWEVER...THE
THREAT IS EXPECTED TO BECOME INCREASINGLY MARGINAL WITH TIME AND
ANOTHER WW ISSUANCE WILL NOT LIKELY BE NEEDED.

DISCUSSION...STORMS CONTINUE ALONG WHAT APPEARS TO BE A CONSOLIDATED
OUTFLOW BOUNDARY AND SWD ALONG THE FRONT OVER NWRN WI. STRONGEST
STORMS HAVE BEEN DEVELOPING AT THE INTERSECTION OF OUTFLOW BOUNDARY
AND WRN EXTENSION OF LAKE BREEZE WHERE A BOWING SEGMENT IS CURRENTLY
ADVANCING THROUGH BAYFIELD COUNTY NORTH OF THE LAKE BREEZE BOUNDARY.
ACTIVITY IS EMBEDDED WITHIN STRONG UNIDIRECTIONAL SHEAR AND
POTENTIAL STILL EXISTS FOR DEVELOPING STORMS TO ORGANIZE.
HOWEVER...OVERALL STORM INTENSITIES ARE EXPECTED TO GRADUALLY
DECREASE TOWARD MID EVENING AS THE BOUNDARY LAYER BEGINS TO
STABILIZE WITH ONSET OF NOCTURNAL COOLING.

..DIAL.. 05/28/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...DLH...MPX...

LAT...LON   44809130 44749231 45779207 46569177 46509065 45839067
            44809130

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 7:47 PM CDT	Mesoscale Discussion	SPC	Burnett, Douglas, Pierce, Polk, Saint Croix	88 min
May 27, 10:11 PM CDT	Mesoscale Discussion	SPC	Burnett, Douglas, Pierce, Polk, Saint Croix	94 min
May 28, 12:00 PM CDT	Mesoscale Discussion	SPC	Adams, Brown, Calumet, Clark, Columbia, Crawford and 34 more	60 min
May 28, 12:54 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Brown, Calumet, Clark, Columbia, Crawford and 47 more	7 hr
May 28, 1:48 PM CDT	Mesoscale Discussion	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Douglas and 8 more	57 min
May 28, 2:07 PM CDT	Severe Thunderstorm Watch	SPC	Ashland, Barron, Bayfield, Burnett, Chippewa, Douglas and 10 more	6 hr
May 28, 3:58 PM CDT	Mesoscale Discussion	SPC	Adams, Ashland, Barron, Bayfield, Brown, Burnett and 59 more	92 min

Nearby

Mesoscale Discussions in Wisconsin, 2012 Every mesoscale discussion 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.