Alert archive / Minnesota / Mesoscale Discussions in 2004

Mesoscale Discussion 997

May 30, 200426 counties in Minnesota; 8 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at May 30, 2004, 2:45 PM CDT for 26 counties in Minnesota; 8 counties in Wisconsin. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 30, 2004, 2:45 PM CDT (19:45 UTC)
Expired: May 30, 2004, 4:45 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 34 counties

Anoka County, MN, Benton County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Dodge County, MN, Douglas County, MN, Fillmore County, MN, Goodhue County, MN, Hennepin County, MN, Houston County, MN, Isanti County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Olmsted County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sherburne County, MN, Stearns County, MN, Todd County, MN, Wabasha County, MN, Washington County, MN, Winona County, MN, Wright County, MN, Buffalo County, WI, Dunn County, WI, La Crosse County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Trempealeau County, WI, Vernon County, WI

The radar

The Minneapolis radar (KMPX), 11 km from the middle of the area, began a volume at 19:45 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, 7.8 hours before the alert went out and 14 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: 482 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 382 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.

455 
ACUS11 KWNS 301946
SWOMCD
SPC MCD 301945 
WIZ000-MNZ000-302145-

MESOSCALE DISCUSSION 0997
NWS STORM PREDICTION CENTER NORMAN OK
0245 PM CDT SUN MAY 30 2004

AREAS AFFECTED...CENTRAL AND SERN MN

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 301945Z - 302145Z

ISOLATED...BRIEF TORNADOES WILL BE POSSIBLE OVER THE NEXT SEVERAL
HOURS ALONG WITH LOW-END SVR HAIL.  A WW COULD BE REQUIRED.

VISIBLE IMAGERY INDICATES HEATING IS OCCURRING IN VICINITY OF
SURFACE LOW...WHERE MARGINAL INSTABILITY OF 500-1000 J/KG MLCAPE HAS
DEVELOPED.  LOW LEVEL CAPE AND VORTICITY IS THEREFORE FAVORABLE FOR
ROTATION IN ANY STORMS THAT FORM.

..JEWELL.. 05/30/2004

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

ATTN...WFO...DLH...ARX...MPX...FGF...

43529260 44049299 44639378 45479511 45809573 46349600
46449522 45889332 45019186 44559138 43499067

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 29, 7:04 PM CDT	Mesoscale Discussion	SPC	Becker, Clay, Douglas, Grant, Norman, Otter Tail and 2 more	116 min
May 29, 9:21 PM CDT	Mesoscale Discussion	SPC	Big Stone, Brown, Chippewa, Cottonwood, Jackson, Kandiyohi and 21 more	54 min
May 30, 12:13 PM CDT	Mesoscale Discussion	SPC	Crawford, Grant, Lafayette	2 hr
May 30, 12:25 PM CDT	Tornado Watch	SPC	Crawford, Grant, Iowa, Lafayette, Richland	7 hr
May 30, 3:16 PM CDT	Mesoscale Discussion	SPC	Columbia, Dane, Grant, Green, Iowa, Jefferson and 5 more	119 min
May 30, 4:25 PM CDT	Tornado Watch	SPC	Columbia, Dane, Dodge, Green, Jefferson, Kenosha and 8 more	6 hr
May 30, 5:36 PM CDT	Mesoscale Discussion	SPC	Columbia, Dane, Dodge, Green, Iowa, Jefferson and 9 more	54 min

Nearby

Mesoscale Discussions in Minnesota, 2004 Mesoscale Discussions in Wisconsin, 2004 Every mesoscale discussion in 2004

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.