Alert archive / Wisconsin / Mesoscale Discussions in 2004

Mesoscale Discussion 1821

August 1, 20046 counties in Wisconsin

The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2004, 6:25 PM CDT for 6 counties in Wisconsin. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Aug 1, 2004, 6:25 PM CDT (23:25 UTC)
Expired
Aug 1, 2004, 7:30 PM CDT
In force
65 min
Issued by
the Storm Prediction Center

Counties Langlade County, WI, Lincoln County, WI, Menominee County, WI, Oneida County, WI, Price County, WI, Shawano County, WI

The radar

The Green Bay radar (KGRB), 170 km from the middle of the area, began a volume at 23:27 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, 11.4 hours before the alert went out and 172 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2004-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2004-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 178 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1103 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
220 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.

624 
ACUS11 KWNS 012326
SWOMCD
SPC MCD 012325 
WIZ000-020030-

MESOSCALE DISCUSSION 1821
NWS STORM PREDICTION CENTER NORMAN OK
0625 PM CDT SUN AUG 01 2004

AREAS AFFECTED...NRN WI

CONCERNING...SEVERE THUNDERSTORM WATCH 679...

VALID 012325Z - 020030Z

...THUNDERSTORMS SHOULD SPREAD INTO NERN PORTIONS OF WI BUT A NEW WW
IS NOT ANTICIPATED...

ONGOING THUNDERSTORM CLUSTER HAS SHIFTED INTO SERN PORTIONS OF WW
AND IS NOW SPREADING INTO NERN WI...JUST EAST OF WW.  THIS ACTIVITY
SHOULD CONTINUE SPREADING ESEWD WITHIN WARM ADVECTION ZONE TOWARD
GREEN BAY OVER THE NEXT FEW HOURS.  ADDITIONAL UPSTREAM DEVELOPMENT
MAY NOT OCCUR IN THE SHORT TERM...BUT RATHER ADVECT INTO PORTIONS OF
MN LATE THIS EVENING.

..DARROW.. 08/01/2004

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

ATTN...WFO...GRB...DLH...ARX...MPX...

46249035 45348801 44458864 45549094

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 31, 9:45 PM CDTSevere Thunderstorm WatchSPCBuffalo, Chippewa, Dunn, Eau Claire, La Crosse, Pepin and 4 more5 hr
Jul 31, 11:41 PM CDTMesoscale DiscussionSPCBuffalo, Eau Claire, Jackson, La Crosse, Monroe, Pepin and 4 more64 min
Aug 1, 3:41 PM CDTMesoscale DiscussionSPCBurnett, Douglas, Langlade, Lincoln, Oneida, Price and 3 more2 hr
Aug 1, 4:00 PM CDTSevere Thunderstorm WatchSPCBarron, Burnett, Douglas, Iron, Lincoln, Oneida and 6 more5 hr

Nearby

Mesoscale Discussions in Wisconsin, 2004Every 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.