Alert archive / North Dakota / Mesoscale Discussions in 2008
Mesoscale Discussion 1821
The Storm Prediction Center issued this mesoscale discussion at Jul 20, 2008, 1:52 AM CDT for 22 counties in North Dakota; Marshall County, South Dakota. It was in force for 83 min.
The area
The outline as issued.
The facts
- Issued
- Jul 20, 2008, 1:52 AM CDT (06:52 UTC)
- Expired
- Jul 20, 2008, 3:15 AM CDT
- In force
- 83 min
- Issued by
- the Storm Prediction Center
All 23 counties
Barnes County, ND, Benson 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, Nelson County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Traill County, ND, Walsh County, ND, Wells County, ND, Marshall County, SD
The radar
The Fargo/Grand Forks radar (KMVX), 76 km from the middle of the area, began a volume at 06:56 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, 6.9 hours before the alert went out and 193 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
- 825 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 1979 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 200652 SWOMCD SPC MCD 200652 NDZ000-SDZ000-200815- MESOSCALE DISCUSSION 1821 NWS STORM PREDICTION CENTER NORMAN OK 0152 AM CDT SUN JUL 20 2008 AREAS AFFECTED...ERN ND CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 200652Z - 200815Z AN ISOLATED THREAT FOR HAIL WILL LIKELY CONTINUE THROUGH LATE TONIGHT ACROSS ERN ND. HOWEVER...THE ACTIVITY SHOULD REMAIN TOO MARGINAL TO WARRANT THE ISSUANCE OF A WW. LATEST SFC ANALYSIS SHOWS A 1010 MB LOW OVER NRN SD WITH A STATIONARY FRONT EXTENDING EAST OF THE LOW ACROSS SCNTRL MN. A MOIST AXIS IS LOCATED JUST EAST OF THE LOW AND THIS IS CONTRIBUTING TO LOCALIZED MODERATE INSTABILITY WHERE RUC ANALYSIS SUGGESTS MLCAPE VALUES RANGE FROM 500 TO 1500 J/KG. THIS ALONG WITH STRONG LARGE-SCALE ASCENT AHEAD OF A SHORTWAVE TROUGH OVER SRN MANITOBA SHOULD HELP SUSTAIN THE CONVECTION LATE TONIGHT ALTHOUGH A CAPPING INVERSION SHOULD KEEP THE STORMS ELEVATED IN NATURE. FORECAST SOUNDINGS THIS EVENING ACROSS THE REGION STRONG VERTICAL SHEAR PROFILES...500 MB TEMPS IN THE -12 TO -14 C RANGE ALONG WITH STEEP MID-LEVEL LAPSE RATES SUGGESTING A THREAT FOR ISOLATED HAIL WILL CONTINUE FOR SEVERAL MORE HOURS. ..BROYLES.. 07/20/2008 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FGF...ABR...BIS... 45709749 45729880 46329950 47529980 48360004 48689961 48779878 48659784 48369737 47719706 46959692 46269685
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 8:17 PM CDT | Mesoscale Discussion | SPC | Emmons | 58 min |
| Jul 20, 4:45 PM CDT | Mesoscale Discussion | SPC | Bennett, Butte, Custer, Fall River, Lawrence, Oglala Lakota and 1 more | 3 hr |
| Jul 20, 5:22 PM CDT | Severe Thunderstorm Watch | SPC | Bennett, Custer, Fall River, Jackson, Lawrence, Meade and 4 more | 7 hr |
Nearby
Mesoscale Discussions in North Dakota, 2008Mesoscale Discussions in South Dakota, 2008Every mesoscale discussion in 2008
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.