Alert archive / Minnesota / Mesoscale Discussions in 2005
Mesoscale Discussion 939
The Storm Prediction Center issued this mesoscale discussion at May 20, 2005, 5:55 PM CDT for 9 counties in Minnesota; 5 counties in North Dakota. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- May 20, 2005, 5:55 PM CDT (22:55 UTC)
- Expired
- May 20, 2005, 7:00 PM CDT
- In force
- 65 min
- Issued by
- the Storm Prediction Center
Counties Becker County, MN, Clay County, MN, Clearwater County, MN, Mahnomen County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Ransom County, ND, Richland County, ND, Traill County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 66 km from the middle of the area, began a volume at 22:55 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
Aberdeen, SD (KABR), launched 12:00Z, 10.9 hours before the alert went out and 290 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1627 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 202255 SWOMCD SPC MCD 202255 MNZ000-NDZ000-210000- MESOSCALE DISCUSSION 0939 NWS STORM PREDICTION CENTER NORMAN OK 0555 PM CDT FRI MAY 20 2005 AREAS AFFECTED...NWRN/NCENTRAL SD AND SWRN/SCENTRAL ND CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 202255Z - 210000Z ISOLATED STG STORM OVER CARTER COUNTY WILL LIKELY CONTINUE TO INTENSIFY AS IT MOVES ENEWD TOWARDS HARDING COUNTY SD AND BOWMAN COUNTY ND. ADDITIONAL ISOLATED SVR DEVELOPMENT IS POSSIBLE ALONG SFC FRONTAL BOUNDARY EXTENDING FROM SWRN ND TO JUST EAST OF BIS. CURRENT TRENDS INDICATE THAT A WW WILL LIKELY BE ISSUED SOON. SFC ANALYSIS SHOWS BOUNDARY EXTENDING FROM FAR SERN MT NEWD TO JUST EAST OF BIS. AIRMASS OVER THE AREA REMAINS CAPPED...WITH MLCINH AROUND 100 J/KG. HOWEVER...RECENT VISIBLE IMAGERY SUGGESTS THAT CAP WAS ERODING TO THE EAST OF BIS AND OVER CARTER COUNTY MT. LOW LEVEL JET IS FORECAST TO INTENSIFY OVER THE NEXT FEW HOURS. COMBINATION OF INCREASED LIFT WITH THE LOW LEVEL JET AND MODERATE INSTABILITY SUGGESTS SVR THREAT SHOULD PERSIST WELL INTO THE EVENING HOURS. ..CROSBIE.. 05/20/2005 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FGF...BIS... 48109614 47629718 47009821 46779845 46269810 46189749 46099687 46199618 47259536 47789504 48059527 48129545
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 1:39 PM CDT | Mesoscale Discussion | SPC | Clay, Kittson, Marshall, Norman, Pennington, Polk and 2 more | 2 hr |
| May 20, 5:23 PM CDT | Mesoscale Discussion | SPC | Becker, Clay, Clearwater, Mahnomen, Norman, Pennington and 3 more | 97 min |
| May 20, 6:10 PM CDT | Severe Thunderstorm Watch | SPC | Becker, Clay, Mahnomen, Norman, Otter Tail, Polk and 2 more | 8 hr |
Nearby
Mesoscale Discussions in Minnesota, 2005Mesoscale Discussions in North Dakota, 2005Every mesoscale discussion in 2005
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.