Alert archive / Wisconsin / Mesoscale Discussions in 2023
Mesoscale Discussion 1721
The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2023, 5:03 AM CDT for 9 counties in Wisconsin. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Jul 26, 2023, 5:03 AM CDT (10:03 UTC)
- Expired
- Jul 26, 2023, 6:30 AM CDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
Counties Adams County, WI, Columbia County, WI, Green Lake County, WI, Juneau County, WI, Marquette County, WI, Portage County, WI, Sauk County, WI, Waupaca County, WI, Waushara County, WI
The radar
The La Crosse radar (KARX), 124 km from the middle of the area, began a volume at 10:03 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 00:00Z, 10.1 hours before the alert went out and 139 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.
- Mixed-layer CAPE
- 1348 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1459 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 138 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted.
839
ACUS11 KWNS 261003
SWOMCD
SPC MCD 261003
WIZ000-261130-
Mesoscale Discussion 1721
NWS Storm Prediction Center Norman OK
0503 AM CDT Wed Jul 26 2023
Areas affected...Central and Eastern WI
Concerning...Severe potential...Watch unlikely
Valid 261003Z - 261130Z
Probability of Watch Issuance...20 percent
SUMMARY...Isolated gusts may continue, but limited coverage of
severe-caliber gust will preclude the need for a downstream watch.
DISCUSSION...Convective complex continues to push across southwest
WI. This complex continues to show a well-developed rear-inflow jet,
with recent velocity data sampling 40 to 50 kt at 3 kft across a
large part of Juneau County. However, low-level stability continues
to prevent the strongest rear-inflow from reaching the surface, with
consistent gusts near 40 kt throughout its duration thus far. LSE
and VOK measured 39 and 37 kt, respectively, as the line moved
through. The overall low-level thermodynamic environment downstream
shows similar, or even stronger, stability. As such, the trend of
sub-severe gusts is expected to persist, precluding the need for a
downstream watch.
..Mosier/Edwards.. 07/26/2023
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...GRB...MKX...ARX...
LAT...LON 44329017 44588991 44488894 43658845 43218902 43138988
43529017 43969014 44329017SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 1:10 AM CDT | Mesoscale Discussion | SPC | Buffalo, Dunn, Pepin, Pierce, Saint Croix, Trempealeau | 95 min |
| Jul 26, 1:31 AM CDT | Severe Thunderstorm Watch | SPC | Buffalo, Crawford, Grant, Jackson, Juneau, La Crosse and 4 more | 4 hr |
| Jul 26, 4:03 AM CDT | Mesoscale Discussion | SPC | Crawford, Grant, Jackson, Juneau, La Crosse, Monroe and 3 more | 87 min |
| Jul 26, 7:30 AM CDT | Mesoscale Discussion | SPC | Green, Rock, Walworth | 90 min |
| Jul 26, 8:45 AM CDT | Mesoscale Discussion | SPC | Kenosha, Racine | 2 hr |
Nearby
Mesoscale Discussions in Wisconsin, 2023Every mesoscale discussion in 2023
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.