Alert archive / North Dakota / Mesoscale Discussions in 2012
Mesoscale Discussion 1808
The Storm Prediction Center issued this mesoscale discussion at Aug 24, 2012, 10:36 PM CDT for 19 counties in North Dakota. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Aug 24, 2012, 10:36 PM CDT (03:36 UTC)
- Expired
- Aug 24, 2012, 11:30 PM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
Counties Barnes County, ND, Cass County, ND, Dickey County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, LaMoure County, ND, Logan County, ND, McIntosh County, ND, Nelson County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Walsh County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 81 km from the middle of the area, began a volume at 03:39 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
Bismarck Municip, ND (KBIS), launched 00:00Z, 3.6 hours before the alert went out and 188 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
- 477 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 2905 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 332 m²/s²
- 0-3 km storm-relative helicity
- 449 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.9
The text
As transmitted, in the capitals the NWS used until 2016.
732
ACUS11 KWNS 250337
SWOMCD
SPC MCD 250336
MNZ000-NDZ000-SDZ000-250430-
MESOSCALE DISCUSSION 1808
NWS STORM PREDICTION CENTER NORMAN OK
1036 PM CDT FRI AUG 24 2012
AREAS AFFECTED...ERN ND
CONCERNING...SEVERE THUNDERSTORM WATCH 588...
VALID 250336Z - 250430Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 588
CONTINUES.
SUMMARY...SEVERE WEATHER THREAT /STRONG WIND GUST/ SHOULD REMAIN
GENERALLY ISOLATED FOR THE REMAINDER OF THE VALID TIME FOR WW
588...WITH A FURTHER DIMINISHING TREND IN THE COVERAGE OF INTENSE
STORMS.
DISCUSSION...ASIDE FROM A BRIEF INCREASE IN TSTM DEVELOPMENT/
INTENSITY ACROSS KIDDER COUNTY ND BETWEEN 0230-03Z...OVERALL TRENDS
IN REGIONAL RADAR IMAGERY AND 7 KM AND 9 KM CAPPI LEVELS SUGGEST THE
THREAT FOR SEVERE WEATHER WITHIN THE REMAINING PORTION OF WW 588 IS
DIMINISHING. THE COLDEST CLOUD TOPS WERE LOCATED OVER EAST
CENTRAL-NERN ND WHICH APPEARS TO BE CO-LOCATED WITH THE STRONGER
FORCING FOR ASCENT SPREADING ENEWD AHEAD OF THE PROGRESSIVE SRN
SASKATCHEWAN SHORTWAVE TROUGH. AS STATED...THE OVERALL SEVERE
WEATHER THREAT WILL CONTINUE TO WANE ACROSS ERN ND DUE TO AN
INCREASE IN SURFACE BASED INHIBITION. HOWEVER...THE AFOREMENTIONED
ASCENT WITH THE UPPER TROUGH AND LOW LEVEL WAA INTO THIS REGION WILL
LIKELY MAINTAIN CONVECTION WITH EMBEDDED ELEVATED TSTMS INTO THE
EARLY OVERNIGHT WITH ACTIVITY REACHING NWRN MN.
..PETERS.. 08/25/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FGF...ABR...BIS...
LAT...LON 48559837 48259714 46909684 45959694 45899894 45949976
47179938 48399932 48559837SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 7:52 PM CDT | Mesoscale Discussion | SPC | Barnes, Benson, Burleigh, Cass, Dickey, Eddy and 17 more | 53 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; radar from the NEXRAD Level II archive.