Alert archive / Wisconsin / Mesoscale Discussions in 2012
Mesoscale Discussion 892
The Storm Prediction Center issued this mesoscale discussion at May 24, 2012, 6:41 PM EDT for 4 counties in Michigan; Houston County, Minnesota; 21 counties in Wisconsin. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 24, 2012, 6:41 PM EDT (22:41 UTC)
- Expired
- May 24, 2012, 8:45 PM EDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Baraga County, MI, Gogebic County, MI, Houghton County, MI, Iron County, MI, Houston County, MN, Adams County, WI, Clark County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Iron County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Monroe County, WI, Oneida County, WI, Portage County, WI, Price County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Vilas County, WI, Wood County, WI
The radar
The Green Bay radar (KGRB), 174 km from the middle of the area, began a volume at 22:42 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.7 hours before the alert went out and 176 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2072 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
634
ACUS11 KWNS 242241
SWOMCD
SPC MCD 242241
MIZ000-WIZ000-MNZ000-250045-
MESOSCALE DISCUSSION 0892
NWS STORM PREDICTION CENTER NORMAN OK
0541 PM CDT THU MAY 24 2012
AREAS AFFECTED...PORTIONS OF SERN MN/NWRN WI/WRN UPPER MI
CONCERNING...TORNADO WATCH 295...
VALID 242241Z - 250045Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 295 CONTINUES.
SUMMARY...BROKEN LINE OF STORMS CONTINUES MOVING ACROSS NWRN AND W
CENTRAL WI AND ADJACENT FAR SERN MN -- WHERE THREAT FOR DAMAGING
WINDS AND HAIL ALONG WITH AN ISOLATED TORNADO OR TWO CONTINUES.
DISCUSSION...A BAND OF STRONG/LOCALLY SEVERE STORMS CONTINUES SHIFT
EWD ACROSS THE UPPER MS VALLEY/WRN UPPER GREAT LAKES
REGION...THROUGH AN ENVIRONMENT FEATURING MODEST INSTABILITY /AOB
500 J/KG MIXED-LAYER CAPE/ BUT VERY STRONG FLOW ALOFT. WITH A
RELATIVELY DRY/DEEP BOUNDARY LAYER AND FLOW ALOFT INCREASING TO 50
KT FROM THE SSW ROUGHLY 1 KM AGL PER AREA VWPS...THREAT FOR
STRONG/DAMAGING WINDS REMAINS EVIDENT WITH THE MORE ROBUST STORMS.
DEGREE OF 0-1 KM SHEAR IS ALSO SUPPORTIVE OF LOW-LEVEL
ROTATION...THOUGH FAIRLY LARGE SURFACE DEWPOINT DEPRESSIONS/HIGH
CLOUD BASES SUGGEST THAT TORNADO THREAT WILL REMAIN ISOLATED.
..GOSS.. 05/24/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MQT...GRB...MKX...DLH...ARX...MPX...
LAT...LON 47218808 46788780 43538983 43509180 44789139 46309064
47218808SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 7:33 AM EDT | Mesoscale Discussion | SPC | Iron | 57 min |
| May 24, 2:34 PM EDT | Mesoscale Discussion | SPC | Gogebic, Iron | 116 min |
| May 24, 3:22 PM EDT | Tornado Watch | SPC | Baraga, Gogebic, Houghton, Iron, Ontonagon | 5 hr |
| May 24, 4:06 PM EDT | Mesoscale Discussion | SPC | Crawford, Grant, Iowa, Richland | 114 min |
| May 24, 4:30 PM EDT | Severe Thunderstorm Watch | SPC | Crawford, Grant, Iowa, Lafayette, Richland, Sauk | 4 hr |
| May 24, 6:42 PM EDT | Mesoscale Discussion | SPC | Crawford, Grant, Iowa, Lafayette, Richland, Sauk | 2 hr |
Nearby
Mesoscale Discussions in Wisconsin, 2012Mesoscale Discussions in Michigan, 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.