Alert archive / Minnesota / Mesoscale Discussions in 2011
Mesoscale Discussion 2091
The Storm Prediction Center issued this mesoscale discussion at Sep 1, 2011, 6:39 AM CDT for 7 counties in Minnesota. It was in force for 36 min.
The area
The outline as issued.
The facts
- Issued
- Sep 1, 2011, 6:39 AM CDT (11:39 UTC)
- Expired
- Sep 1, 2011, 7:15 AM CDT
- In force
- 36 min
- Issued by
- the Storm Prediction Center
Counties Beltrami County, MN, Cass County, MN, Clearwater County, MN, Hubbard County, MN, Itasca County, MN, Koochiching County, MN, Wadena County, MN
The radar
The Duluth radar (KDLH), 195 km from the middle of the area, began a volume at 11:40 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
International Fa, MN (KINL), launched 00:00Z, 11.7 hours before the alert went out and 155 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
- 4 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 463 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
666
ACUS11 KWNS 011140
SWOMCD
SPC MCD 011139
MNZ000-011215-
MESOSCALE DISCUSSION 2091
NWS STORM PREDICTION CENTER NORMAN OK
0639 AM CDT THU SEP 01 2011
AREAS AFFECTED...NRN MN
CONCERNING...SEVERE THUNDERSTORM WATCH 820...
VALID 011139Z - 011215Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 820
CONTINUES.
WW 820 WILL BE ALLOWED TO EXPIRE AT 12Z...AND A NEW WW ISSUANCE IS
UNLIKELY AT THIS TIME.
AN ISOLATED SEVERE WEATHER THREAT REMAINS ACROSS THE ERN EXTENT OF
WW 820 ACROSS NORTH CENTRAL MN /CLEARWATER AND BELTRAMI COUNTIES/
AND INTO ADJACENT COUNTIES OF NRN CASS TO KOOCHICHING.
HOWEVER...EVEN THIS THREAT APPEARS TO BE WANING PER A DECREASING
TREND IN LIGHTNING STRIKES AND WARMING CLOUD TOPS ALONG THE
ATTENDANT SRN PERIPHERY OF THE MCS CONVECTIVE CLOUD/PRECIPITATION
SHIELD ADVANCING EWD ACROSS NRN MN EARLY THIS MORNING.
LOW LEVEL WAA SHOULD GRADUALLY WEAKEN ACROSS MUCH OF NORTH
CENTRAL-NERN MN AS THE SWLY LLJ ALSO DECREASES IN SPEED. THIS
ASCENT COMBINED WITH DIFFLUENT FLOW REGIME ALOFT OVER NRN MN WILL
PROVIDE SUFFICIENT DEEP LAYER UVVS FOR CONTINUED SHOWERS/TSTMS THIS
MORNING. HOWEVER...WEAKENING WAA/INSTABILITY SUGGEST A LOWER
POTENTIAL FOR THE DEVELOPMENT OF MORE ROBUST UPDRAFTS AND SUBSEQUENT
SEVERE WEATHER THREAT.
..PETERS.. 09/01/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DLH...FGF...
LAT...LON 47169533 47689559 48139546 48489421 48439322 47709327
46949397 46579457 46569507 47169533SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 12:48 AM CDT | Severe Thunderstorm Watch | SPC | Beltrami, Clearwater, Kittson, Lake of the Woods, Mahnomen, Marshall and 5 more | 6 hr |
| Sep 1, 3:40 AM CDT | Mesoscale Discussion | SPC | Beltrami, Clearwater, Itasca, Kittson, Koochiching, Lake of the Woods and 7 more | 65 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.