Alert archive / Wisconsin / Mesoscale Discussions in 2012
Mesoscale Discussion 1680
The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2012, 10:11 PM CDT for 5 counties in Minnesota; 9 counties in Wisconsin. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2012, 10:11 PM CDT (03:11 UTC)
- Expired
- Aug 1, 2012, 11:45 PM CDT
- In force
- 94 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 40%
Counties Fillmore County, MN, Houston County, MN, Olmsted County, MN, Wabasha County, MN, Winona County, MN, Buffalo County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Pepin County, WI, Pierce County, WI, Trempealeau County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 63 km from the middle of the area, began a volume at 03:14 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 00:00Z, 3.2 hours before the alert went out and 160 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
- 2247 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 1724 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 101 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.9
The text
As transmitted, in the capitals the NWS used until 2016.
837
ACUS11 KWNS 020312
SWOMCD
SPC MCD 020311
WIZ000-IAZ000-MNZ000-020445-
MESOSCALE DISCUSSION 1680
NWS STORM PREDICTION CENTER NORMAN OK
1011 PM CDT WED AUG 01 2012
AREAS AFFECTED...EXTREME SERN MN/SWRN WI
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 020311Z - 020445Z
PROBABILITY OF WATCH ISSUANCE...40 PERCENT
SUMMARY...A SMALL CLUSTER OF SVR TSTMS OVER SERN MN MAY CONTINUE TO
POSE A SVR WIND/HAIL THREAT FOR A FEW MORE HOURS AS IT MOVES EWD
INTO SWRN WI. CONVECTIVE TRENDS ARE BEING MONITORED.
DISCUSSION...A SMALL CLUSTER OF SVR TSTMS OVER SERN MN WILL MOVE
GENLY EWD INTO SWRN WI THROUGH 05Z. THE ENVIRONMENT IN THE IMMEDIATE
PATH OF THIS CLUSTER IS FAVORABLE FOR A CONTINUED LOCALIZED SVR WIND
AND HAIL THREAT. LATEST OBJECTIVE ANALYSIS SUGGESTS TSTM CLUSTER IS
CURRENTLY MOVING THROUGH AN AXIS OF MODERATE TO STRONG INSTABILITY
WITH MUCAPE 2000 TO 3000 J/KG AND EFFECTIVE BULK SHEAR OF 25 TO 30
KT. ALTHOUGH THE SVR THREAT IS CURRENTLY RELATIVELY
LOCALIZED...CONVECTIVE TRENDS WILL BE MONITORED FOR SIGNS OF A
DEVELOPING COLD POOL WHICH WOULD SUGGEST A MORE SUSTAINED SVR
THREAT.
..BUNTING/HART.. 08/02/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MKX...ARX...MPX...
LAT...LON 43749259 44299269 44599269 44809259 44839240 44849224
44709155 44259042 43788993 43409034 43409107 43669227
43759260 43749259SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 7:35 PM CDT | Mesoscale Discussion | SPC | Anoka, Blue Earth, Brown, Carver, Chippewa, Cottonwood and 27 more | 55 min |
Nearby
Mesoscale Discussions in Wisconsin, 2012Mesoscale Discussions in Minnesota, 2012Every 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.