Alert archive / North Dakota / Mesoscale Discussions in 2012
Mesoscale Discussion 873
The Storm Prediction Center issued this mesoscale discussion at May 22, 2012, 6:54 PM CDT for 15 counties in North Dakota. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- May 22, 2012, 6:54 PM CDT (23:54 UTC)
- Expired
- May 22, 2012, 8:30 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
Counties Benson County, ND, Bottineau County, ND, Burleigh County, ND, Eddy County, ND, Foster County, ND, Kidder County, ND, McHenry County, ND, Pierce County, ND, Ramsey County, ND, Renville County, ND, Rolette County, ND, Sheridan County, ND, Towner County, ND, Ward County, ND, Wells County, ND
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.9 hours before the alert went out and 179 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
- 242 J/kg
- Mixed-layer CIN
- -610 J/kg
- Mixed-layer LCL
- 1843 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 103 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
152
ACUS11 KWNS 222354
SWOMCD
SPC MCD 222354
NDZ000-230130-
MESOSCALE DISCUSSION 0873
NWS STORM PREDICTION CENTER NORMAN OK
0654 PM CDT TUE MAY 22 2012
AREAS AFFECTED...PARTS OF NRN AND CNTRL NORTH DAKOTA
CONCERNING...TORNADO WATCH 290...
VALID 222354Z - 230130Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 290 CONTINUES.
SUMMARY...THE EVOLUTION OF A SEVERE MESOSCALE CONVECTIVE SYSTEM
STILL APPEARS POSSIBLE THIS EVENING ACROSS PARTS OF NORTHERN/CENTRAL
NORTH DAKOTA.
DISCUSSION...RECENT ISOLATED SUPERCELL DEVELOPMENT APPEARS FOCUSED
NEAR A SURFACE LOW CENTER WEST OF MINOT...WHERE AN EASTERLY
COMPONENT TO THE NEAR SURFACE FLOW IS ENHANCING LOW-LEVEL SHEAR. AS
THE LEFT EXIT REGION OF A MID/UPPER JET STREAK NOSING EAST NORTHEAST
OF THE NORTHERN ROCKIES CONTRIBUTES TO STRENGTHENING LARGE-SCALE
ASCENT ACROSS THE REGION THIS EVENING...THIS CELL PROBABLY WILL
MERGE WITH AN APPROACHING CLUSTER OF STORMS EMERGING FROM
NORTHEASTERN MONTANA/SOUTHERN SASKATCHEWAN. AND FURTHER UPSCALE
CONVECTIVE GROWTH APPEARS LIKELY THROUGH 02-03Z...INCLUDING EVENTUAL
SOUTH SOUTHEASTWARD DEVELOPMENT INTO THE WARM SECTOR OF THE SURFACE
LOW ACROSS CENTRAL NORTH DAKOTA. AS THIS OCCURS...IN THE PRESENCE
OF A WESTERLY DEEP LAYER MEAN FLOW FIELD STRENGTHENING TO 30-50
KT... IT STILL APPEARS THAT THE SEVERE THREAT MAY TRANSITION FROM
MAINLY LARGE HAIL/ISOLATED TORNADOES INTO GENERALLY POTENTIALLY
DAMAGING CONVECTIVE SURFACE GUSTS.
..KERR.. 05/22/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FGF...BIS...
LAT...LON 49019864 47629833 46529950 46640055 47390098 47980148
48450179 49050197 49360193 49690068 49679969 49019864SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 3:44 PM CDT | Mesoscale Discussion | SPC | Benson, Bottineau, Burke, Burleigh, Dunn, Eddy and 20 more | 91 min |
| May 22, 4:03 PM CDT | Tornado Watch | SPC | Barnes, Benson, Bottineau, Burke, Burleigh, Divide and 21 more | 7 hr |
| May 22, 5:54 PM CDT | Severe Thunderstorm Watch | SPC | Cass, Dickey, Emmons, Grand Forks, LaMoure, Logan and 6 more | 7 hr |
| May 22, 6:11 PM CDT | Mesoscale Discussion | SPC | Adams, Billings, Bowman, Hettinger, Slope, Stark | 94 min |
Nearby
Mesoscale Discussions in North 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.