Alert archive / Wisconsin / Mesoscale Discussions in 2012
Mesoscale Discussion 1580
The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2012, 2:05 AM CDT for 5 counties in Minnesota; 9 counties in Wisconsin. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Jul 25, 2012, 2:05 AM CDT (07:05 UTC)
- Expired
- Jul 25, 2012, 3:00 AM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 80%
Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Pine County, MN, Ashland County, WI, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Iron County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Washburn County, WI
The radar
The Duluth radar (KDLH), 65 km from the middle of the area, began a volume at 07:06 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 7.1 hours before the alert went out and 188 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
- 1518 J/kg
- Mixed-layer CIN
- -135 J/kg
- Mixed-layer LCL
- 877 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 392 m²/s²
- Significant tornado parameter
- 1.2
- Supercell composite
- 17.7
The text
As transmitted, in the capitals the NWS used until 2016.
475
ACUS11 KWNS 250705
SWOMCD
SPC MCD 250705
WIZ000-MNZ000-250800-
MESOSCALE DISCUSSION 1580
NWS STORM PREDICTION CENTER NORMAN OK
0205 AM CDT WED JUL 25 2012
AREAS AFFECTED...CENTRAL MN TO NW WI
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 250705Z - 250800Z
PROBABILITY OF WATCH ISSUANCE...80 PERCENT
SUMMARY...LINEAR MCS HAS BECOME BETTER ORGANIZED IN THE PAST HOUR
ACROSS CENTRAL MN...AND IS NOW MOVING EWD AT 40 KT. THE RISK FOR
DAMAGING WINDS WILL LIKELY PERSIST INTO AREAS NEAR AND SW-SE OF
DLH...INTO NW WI THROUGH THE EARLY MORNING HOURS. A NEW SEVERE
THUNDERSTORM WATCH WILL BE PROPOSED SHORTLY.
DISCUSSION...CONVECTIVE CLUSTER THAT FORMED EARLIER IN SE ND HAS
MOVED EWD AND EVOLVED INTO A MORE N-S ORIENTED LINE...WITH EWD
MOTION AT 40 KT. THE STORMS ARE MOVE ALONG THE N EDGE OF THE
INSTABILITY GRADIENT...N OF THE SURFACE WARM FRONT AND EMBEDDED
WITHIN A BELT OF 40-45 KT WLY MIDLEVEL FLOW CRESTING THE ERN
PLAINS/MS VALLEY RIDGE. A FEED OF LOW 70S BOUNDARY LAYER DEWPOINTS
AND MODERATE INSTABILITY WILL CONTINUE FROM THE SW ON A 30-40 KT
LLJ. THUS...THE ENVIRONMENT WILL REMAIN SUPPORTIVE OF A DAMAGING
WIND RISK THROUGH THE EARLY MORNING HOURS AS THE CONVECTION
APPROACHES AREAS NEAR AND S OF DLH BY 0930Z...AND CONTINUES INTO NW
WI THEREAFTER.
..THOMPSON/PETERS.. 07/25/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DLH...ARX...MPX...FGF...
LAT...LON 45539019 45359082 45669222 46009321 46319453 46709471
47089457 47109390 46949196 46649069 46229005 45539019SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 9:08 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Cass, Clay, Crow Wing, Douglas, Grant and 8 more | 7 hr |
| Jul 24, 11:24 PM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Benton, Big Stone, Cass, Clay and 20 more | 96 min |
| Jul 25, 2:24 AM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Benton, Carlton, Cass, Chisago, Crow Wing and 13 more | 5 hr |
| Jul 25, 3:41 AM CDT | Mesoscale Discussion | SPC | Becker, Clay, Grant, Hubbard, Mahnomen, Otter Tail and 2 more | 34 min |
| Jul 25, 5:24 AM CDT | Mesoscale Discussion | SPC | Aitkin, Benton, Big Stone, Carlton, Cass, Chisago and 20 more | 66 min |
| Jul 25, 1:56 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Big Stone, Clay, Clearwater, Grant and 14 more | 2 hr |
| Jul 25, 5:16 PM CDT | Severe Thunderstorm Watch | SPC | Blue Earth, Dodge, Faribault, Fillmore, Freeborn, Goodhue and 11 more | 8 hr |
| Jul 25, 2:57 PM CDT | Mesoscale Discussion | SPC | Brown, Calumet, Clark, Eau Claire, Fond du Lac, Jackson and 17 more | 2 hr |
| Jul 25, 6:25 PM CDT | Mesoscale Discussion | SPC | Brown, Calumet, Dodge, Fond du Lac, Green Lake, Kewaunee and 8 more | 95 min |
| Jul 25, 6:38 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Calumet, Columbia, Dane, Dodge, Fond du Lac and 23 more | 7 hr |
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.