Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 718

May 17, 20044 states

The Storm Prediction Center issued this mesoscale discussion at May 17, 2004, 12:41 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued: May 17, 2004, 12:41 PM CDT (17:41 UTC)
Expired: May 17, 2004, 3:15 PM CDT
In force: 3 hr
Issued by: the Storm Prediction Center

All 47 counties

Benton County, IA, Buchanan County, IA, Clayton County, IA, Delaware County, IA, Dubuque County, IA, Jackson County, IA, Jones County, IA, Linn County, IA, Jo Daviess County, IL, Stephenson County, IL, Winnebago County, IL, Menominee County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jefferson County, WI, Juneau County, WI, Kewaunee County, WI, Lafayette County, WI, Manitowoc County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Ozaukee County, WI, Portage County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Shawano County, WI, Sheboygan County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The La Crosse radar (KARX), 117 km from the middle of the area, began a volume at 17:42 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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.7 hours before the alert went out and 194 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: 17 J/kg
Mixed-layer CIN: -436 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 108 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.

208 
ACUS11 KWNS 171742
SWOMCD
SPC MCD 171741 
MIZ000-WIZ000-ILZ000-IAZ000-172015-

MESOSCALE DISCUSSION 0718
NWS STORM PREDICTION CENTER NORMAN OK
1241 PM CDT MON MAY 17 2004

AREAS AFFECTED...EASTERN IA...SOUTHERN WI...NORTHWEST IL

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 171741Z - 172015Z

SCATTERED THUNDERSTORM DEVELOPMENT EXPECTED ALONG/AHEAD OF SURFACE
COLD FRONT MOVING ACROSS IA/WI.  WW MAY BE REQUIRED IN 1-3 HOURS.

LATEST SURFACE ANALYSIS SHOWS COLD FRONT EXTENDING FROM NORTHERN WI
INTO WESTERN IA.  STRONG DAYTIME HEATING IS OCCURRING AHEAD OF FRONT
 ALONG AN AXIS FROM SOUTHERN/EASTERN WI INTO EASTERN IA...WHERE
TEMPS HAVE WARMED INTO THE LOW/MID 70S.  CURRENT SBCAPE VALUES RANGE
FROM 1500-2000 J/KG.  PRESENT INDICATIONS ARE THAT SCATTERED
THUNDERSTORMS WILL DEVELOP IN THE NEXT FEW HOURS ACROSS THIS REGION
AS COLD FRONT APPROACHES AND CAP CONTINUES TO WEAKEN.  STRONG
WESTERLY WINDS ABOVE THE SURFACE WILL PROMOTE A RISK OF DAMAGING
WINDS IN STRONGER STORMS.  SUFFICIENT DEEP LAYER VERTICAL SHEAR
PROFILES ALSO SUGGEST A RISK OF SUPERCELLS CAPABLE OF LARGE HAIL.

..HART.. 05/17/2004

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

ATTN...WFO...MQT...GRB...LOT...MKX...DVN...ARX...DMX...

42649216 43519079 44438976 46048804 45518687 43318784
42618847 42188949 41819134 41899212

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 10:22 AM CDT	Mesoscale Discussion	SPC	Cook, Ford, Iroquois, Kankakee, Will	2 hr
May 17, 6:44 PM CDT	Mesoscale Discussion	SPC	Boone, Jo Daviess, McHenry, Stephenson, Winnebago	61 min
May 16, 8:21 PM CDT	Mesoscale Discussion	SPC	Emmet	114 min
May 16, 9:26 PM CDT	Mesoscale Discussion	SPC	Adams, Audubon, Buena Vista, Calhoun, Carroll, Cass and 28 more	3 hr
May 17, 1:42 PM CDT	Mesoscale Discussion	SPC	Buena Vista, Calhoun, Carroll, Cherokee, Crawford, Harrison and 4 more	2 hr
May 17, 3:52 PM CDT	Mesoscale Discussion	SPC	Adair, Adams, Appanoose, Benton, Cass, Clarke and 33 more	113 min
May 17, 4:45 PM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Cass and 26 more	5 hr
May 17, 12:05 PM CDT	Severe Thunderstorm Watch	SPC	Allegan, Barry, Bay, Branch, Calhoun, Cass and 29 more	7 hr
May 17, 3:05 PM CDT	Mesoscale Discussion	SPC	Alcona, Alpena, Antrim, Arenac, Barry, Bay and 44 more	85 min
May 17, 4:46 PM CDT	Mesoscale Discussion	SPC	Arenac, Bay, Clinton, Genesee, Gladwin, Gratiot and 19 more	89 min

Nearby

Mesoscale Discussions in Wisconsin, 2004 Mesoscale Discussions in Iowa, 2004 Mesoscale Discussions in Illinois, 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.