Alert archive / Minnesota / Mesoscale Discussions in 2011
Mesoscale Discussion 1813
The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2011, 10:42 AM CDT for 11 counties in Minnesota. It was in force for 63 min.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2011, 10:42 AM CDT (15:42 UTC)
- Expired
- Aug 1, 2011, 11:45 AM CDT
- In force
- 63 min
- Issued by
- the Storm Prediction Center
Counties Benton County, MN, Kandiyohi County, MN, Meeker County, MN, Mille Lacs County, MN, Morrison County, MN, Pope County, MN, Sherburne County, MN, Stearns County, MN, Swift County, MN, Todd County, MN, Wright County, MN
The radar
The Minneapolis radar (KMPX), 92 km from the middle of the area, began a volume at 15:43 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 12:00Z, 3.7 hours before the alert went out and 90 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
- 2974 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 898 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
628
ACUS11 KWNS 011543
SWOMCD
SPC MCD 011542
MNZ000-011645-
MESOSCALE DISCUSSION 1813
NWS STORM PREDICTION CENTER NORMAN OK
1042 AM CDT MON AUG 01 2011
AREAS AFFECTED...CENTRAL MN
CONCERNING...SEVERE THUNDERSTORM WATCH 708...
VALID 011542Z - 011645Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 708
CONTINUES.
ISOLATED STRONG TO SEVERE STORMS REMAIN POSSIBLE MAINLY ACROSS
CENTRAL MN THROUGH 17Z. OVERALL DECREASING TREND IN COVERAGE OF
STRONGER ACTIVITY IS EXPECTED TO CONTINUE THROUGH EARLY AFTERNOON
AND THUS WILL LIMIT THE NEED FOR A NEW WW.
SURFACE ANALYSES INDICATED A CONVECTIVE OUTFLOW BOUNDARY EXTENDED
FROM THE TWIN CITIES METRO WSWWD TO JUST N OF RWF...NEAR ATY...TO 35
SE MBG. 25-30 KT SWLY LLJ EXTENDING INTO ERN SD/WEST CENTRAL MN WAS
MAINTAINING A WAA REGIME ALONG AND N OF THE OUTFLOW BOUNDARY AND
SUPPORTING ADDITIONAL TSTM DEVELOPMENT WITHIN THE REMNANT MCS.
INFLOW OF STEEPER MIDLEVEL LAPSE RATES AND STRONGER INSTABILITY
RESIDING OVER SD COMBINED WITH EFFECTIVE BULK SHEAR /40-50 KT/
ACROSS CENTRAL MN SUGGEST THIS TSTM COMPLEX WILL CONTINUE TO HAVE
NEW DEVELOPMENT INTO THE AFTERNOON. HOWEVER...GIVEN DOWNSTREAM
CLOUD AND PRECIPITATION SHIELD LIMITING SURFACE HEATING AND
REDUCTION OF SBCINH...TSTM ACTIVITY IS EXPECTED TO REMAIN ELEVATED
WITH PERIODIC STRONGER UPDRAFTS SUPPORTING AN ISOLATED SEVERE STORM.
..PETERS.. 08/01/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DLH...MPX...
LAT...LON 44969385 44969470 45249570 45869559 46109512 46169417
45969347 45449327 45199346 44969385SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 10:26 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Clearwater, Grant, Kittson, Mahnomen and 8 more | 8 hr |
| Aug 1, 12:35 AM CDT | Mesoscale Discussion | SPC | Clay, Norman, Polk | 85 min |
| Aug 1, 2:31 AM CDT | Mesoscale Discussion | SPC | Becker, Cass, Clay, Clearwater, Crow Wing, Douglas and 11 more | 89 min |
| Aug 1, 4:57 AM CDT | Severe Thunderstorm Watch | SPC | Becker, Benton, Big Stone, Brown, Cass, Chippewa and 28 more | 7 hr |
| Aug 1, 7:31 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Blue Earth, Brown, Carver, Chippewa and 33 more | 89 min |
| Aug 1, 11:29 AM CDT | Mesoscale Discussion | SPC | Anoka, Benton, Carver, Chisago, Dakota, Hennepin and 8 more | 31 min |
| Aug 1, 11:52 AM CDT | Severe Thunderstorm Watch | SPC | Anoka, Becker, Benton, Big Stone, Blue Earth, Brown and 43 more | 7 hr |
| Aug 1, 1:50 PM CDT | Mesoscale Discussion | SPC | Blue Earth, Dakota, Dodge, Fillmore, Freeborn, Goodhue and 12 more | 25 min |
| Aug 1, 2:04 PM CDT | Severe Thunderstorm Watch | SPC | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 5 hr |
| Aug 1, 3:53 PM CDT | Mesoscale Discussion | SPC | Anoka, Becker, Benton, Blue Earth, Carver, Chippewa and 47 more | 67 min |
Nearby
Mesoscale Discussions in Minnesota, 2011Every mesoscale discussion in 2011
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.