Alert archive / Minnesota / Mesoscale Discussions in 2012
Mesoscale Discussion 1677
The Storm Prediction Center issued this mesoscale discussion at Aug 1, 2012, 7:35 PM CDT for 33 counties in Minnesota; 9 counties in South Dakota. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Aug 1, 2012, 7:35 PM CDT (00:35 UTC)
- Expired
- Aug 1, 2012, 8:30 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
All 42 counties
Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chippewa County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Goodhue County, MN, Hennepin County, MN, Kandiyohi County, MN, Lac qui Parle County, MN, Le Sueur County, MN, Lincoln County, MN, Lyon County, MN, McLeod County, MN, Meeker County, MN, Murray County, MN, Nicollet County, MN, Pipestone County, MN, Ramsey County, MN, Redwood County, MN, Renville County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Swift County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Wright County, MN, Yellow Medicine County, MN, Brookings County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Kingsbury County, SD, Lake County, SD, Miner County, SD, Moody County, SD
The radar
The Minneapolis radar (KMPX), 92 km from the middle of the area, began a volume at 00:39 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, 0.6 hours before the alert went out and 89 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.
936 ACUS11 KWNS 020036 SWOMCD SPC MCD 020035 WIZ000-MNZ000-SDZ000-020130- MESOSCALE DISCUSSION 1677 NWS STORM PREDICTION CENTER NORMAN OK 0735 PM CDT WED AUG 01 2012 AREAS AFFECTED...SRN MN...ERN SD CONCERNING...SEVERE THUNDERSTORM WATCH 549... VALID 020035Z - 020130Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 549 CONTINUES. SUMMARY...CLUSTER OF SVR TSTMS NEAR RWF WILL LIKELY CONTINUE WITH A THREAT OF WIND DAMAGE THROUGH AT LEAST 03Z. BEYOND THAT...UNCERTAINTY EXISTS DUE TO THE DEGREE TO WHICH THE COLD POOL/SHEAR BALANCE CAN BE MAINTAINED. STRONGER UPDRAFTS WITHIN THIS CLUSTER WILL ALSO HAVE THE POTENTIAL TO PRODUCE LARGE HAIL. DISCUSSION...SVR TSTMS VICINITY RWF HAVE DEVELOPED A SMALL COLD POOL AND ARE PRODUCING DAMAGING WINDS...REF G69KT AT RWF...THAT WILL LIKELY CONTINUE THROUGH AT LEAST 03Z. ENVIRONMENT AHEAD OF THIS CLUSTER IS CHARACTERIZED BY MLCAPE IN EXCESS OF 3000 J/KG AND A LARGELY UNIDIRECTIONAL WIND PROFILE ABOVE THE BOUNDARY LAYER. SHORT-TERM ENVIRONMENT APPEARS FAVORABLE FOR ADDITIONAL ENHANCED WIND DAMAGE THREAT. BEYOND 03Z...THERE IS SOME QUESTION WHETHER THE COLD POOL/SHEAR BALANCE CAN BE MAINTAINED AND SUSTAIN THE WIND DAMAGE THREAT. IN ADDITION...THE LOSS OF DIURNAL HEATING WILL LIKELY LEAD TO INCREASING CINH WITH TIME LATER THIS EVENING. ..BUNTING/HART.. 08/02/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ARX...MPX...FSD...ABR... LAT...LON 45309269 43719270 43719771 45319770 45309269
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 10:11 PM CDT | Mesoscale Discussion | SPC | Fillmore, Houston, Olmsted, Wabasha, Winona | 94 min |
| Aug 1, 8:19 PM CDT | Mesoscale Discussion | SPC | Bon Homme, Clay, Union, Yankton | 56 min |
| Aug 2, 2:44 PM CDT | Mesoscale Discussion | SPC | Butte, Harding, Lawrence, Meade, Perkins | 31 min |
| Aug 2, 3:03 PM CDT | Severe Thunderstorm Watch | SPC | Butte, Harding, Lawrence, Meade, Perkins | 7 hr |
Nearby
Mesoscale Discussions in Minnesota, 2012Mesoscale Discussions in South Dakota, 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.