Alert archive / Minnesota / Mesoscale Discussions in 2012
Mesoscale Discussion 668
The Storm Prediction Center issued this mesoscale discussion at May 2, 2012, 9:18 PM CDT for 16 counties in Minnesota. It was in force for 27 min.
The area
The outline as issued.
The facts
- Issued
- May 2, 2012, 9:18 PM CDT (02:18 UTC)
- Expired
- May 2, 2012, 9:45 PM CDT
- In force
- 27 min
- Issued by
- the Storm Prediction Center
Counties Blue Earth County, MN, Brown County, MN, Cottonwood County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Murray County, MN, Nicollet County, MN, Nobles County, MN, Rice County, MN, Steele County, MN, Waseca County, MN, Watonwan County, MN
The radar
The Minneapolis radar (KMPX), 96 km from the middle of the area, began a volume at 02:18 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, 2.3 hours before the alert went out and 95 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
- 84 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 1937 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
281
ACUS11 KWNS 030218
SWOMCD
SPC MCD 030218
MNZ000-WIZ000-IAZ000-030245-
MESOSCALE DISCUSSION 0668
NWS STORM PREDICTION CENTER NORMAN OK
0918 PM CDT WED MAY 02 2012
AREAS AFFECTED...PARTS OF SOUTH CENTRAL AND SWRN MN
CONCERNING...SEVERE THUNDERSTORM WATCH 225...
VALID 030218Z - 030245Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 225
CONTINUES.
SUMMARY...WW 225 MAY BE CANCELLED WELL BEFORE THE SCHEDULED 04Z
EXPIRATION TIME. ADDITIONAL STORMS MAY AFFECT THE NWRN-NRN EXTENT
OF THIS WW AS ACTIVITY FROM NERN SD ADVANCES EWD. HOWEVER...THAT
POTENTIAL WOULD NOT OCCUR UNTIL AFTER 04Z.
DISCUSSION...REGIONAL RADAR TRENDS THIS EVENING INDICATED A STORM
MOVING EWD AND EXITING GOODHUE COUNTY MN INTO WW 227. THE AIR MASS
IN THE WAKE OF THIS STORM AND ADDITIONAL ACTIVITY AFFECTING SERN MN
INTO ADJACENT BUFFALO COUNTY WI HAS BEEN CONVECTIVELY
OVERTURNED/STABILIZED. IN ADDITION TO THIS LIMITING FACTOR TO
SUPPORT NEW TSTM DEVELOPMENT WWD ACROSS WW 225...LOW LEVEL
CONVERGENCE IS LACKING...LIKELY DUE TO LOW LEVEL DIFLUENT FLOW
REGIME OVER NWRN IA INTO SWRN-SOUTH CENTRAL MN PER REGIONAL VWP
DATA.
..PETERS.. 05/03/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...ARX...MPX...DMX...FSD...
LAT...LON 44209624 44549380 44559234 44279263 44119310 43489309
43509604 44209624SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 2, 7:20 PM CDT | Mesoscale Discussion | SPC | Big Stone, Clay, Grant, Traverse, Wilkin | 55 min |
| May 2, 7:38 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Brown, Cottonwood, Dodge, Faribault, Fillmore and 16 more | 37 min |
| May 2, 7:47 PM CDT | Severe Thunderstorm Watch | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 5 hr |
| May 2, 11:06 PM CDT | Mesoscale Discussion | SPC | Anoka, Big Stone, Carver, Chippewa, Dakota, Hennepin and 17 more | 24 min |
| May 3, 8:43 AM CDT | Mesoscale Discussion | SPC | Dakota, Dodge, Goodhue, Olmsted, Rice, Steele and 2 more | 92 min |
Nearby
Mesoscale 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.