Alert archive / South Dakota / Mesoscale Discussions in 2007
Mesoscale Discussion 1713
The Storm Prediction Center issued this mesoscale discussion at Aug 10, 2007, 4:33 PM CDT for 5 counties in Nebraska; 7 counties in South Dakota. It was in force for 57 min.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2007, 4:33 PM CDT (21:33 UTC)
- Expired
- Aug 10, 2007, 5:30 PM CDT
- In force
- 57 min
- Issued by
- the Storm Prediction Center
Counties Blaine County, NE, Brown County, NE, Cherry County, NE, Hooker County, NE, Thomas County, NE, Bennett County, SD, Haakon County, SD, Jackson County, SD, Jones County, SD, Mellette County, SD, Stanley County, SD, Todd County, SD
The radar
The Rapid City radar (KUDX), 164 km from the middle of the area, began a volume at 21:35 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
Rapid City, SD (KUNR), launched 12:00Z, 9.6 hours before the alert went out and 166 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
- 4321 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 83 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 102133 SWOMCD SPC MCD 102133 NEZ000-SDZ000-102230- MESOSCALE DISCUSSION 1713 NWS STORM PREDICTION CENTER NORMAN OK 0433 PM CDT FRI AUG 10 2007 AREAS AFFECTED...WRN/CENTRAL SD AND NRN NEB CONCERNING...SEVERE POTENTIAL...WATCH LIKELY VALID 102133Z - 102230Z THUNDERSTORM DEVELOPMENT APPEARS LIKELY THE NEXT 1-2 HOURS FROM WRN SD INTO NRN NEB. A SEVERE TSTM WATCH MAY BE NEEDED SOON. VISIBLE IMAGERY SHOWS DEEPENING CUMULUS DEVELOPMENT INVOF A SURFACE TROUGH ACROSS WRN SD...WITH SEPARATE CUMULUS DEVELOPMENT ALONG AN OUTFLOW BOUNDARY IN NRN NEB. RICHER MOISTURE AND RESULTANT STRONG INSTABILITY IS PRESENT ALONG THE OUTFLOW BOUNDARY IN NEB...EXTENDING NWD INTO SRN/CENTRAL SD. TO THE W...HOT SURFACE TEMPERATURES AND A DEEP MIXED LAYER HAVE REDUCED CONVECTIVE INHIBITION TO THE POINT THAT THUNDERSTORM DEVELOPMENT NOW APPEARS LIKELY BY 22-23Z. VERY STEEP LAPSE RATES AND EFFECTIVE BULK SHEAR OF 40-50 KT SHOULD SUPPORT A FEW SUPERCELL TYPE STORMS...WITH LARGE HAIL AND DAMAGING WINDS THE MAIN SEVERE THREATS THROUGH THE EVENING. ..THOMPSON.. 08/10/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...ABR...LBF...UNR... 44900150 44840064 44540034 43430027 42099934 41789993 41820157 42270207 42740222 44710164
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 8:18 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Cedar, Knox, Madison, Pierce, Stanton and 1 more | 4 hr |
| Aug 9, 9:33 PM CDT | Mesoscale Discussion | SPC | Antelope, Boone, Boyd, Burt, Butler, Cedar and 18 more | 87 min |
| Aug 9, 10:14 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Boone, Burt, Butler, Cass, Cedar and 18 more | 6 hr |
| Aug 10, 1:45 AM CDT | Mesoscale Discussion | SPC | Antelope, Boone, Boyd, Burt, Butler, Cass and 23 more | 60 min |
| Aug 10, 4:25 AM CDT | Mesoscale Discussion | SPC | Antelope, Boyd, Cedar, Colfax, Cuming, Dixon and 8 more | 35 min |
| Aug 10, 10:45 AM CDT | Mesoscale Discussion | SPC | Boyd, Brown, Cherry, Grant, Keya Paha, Rock | 90 min |
| Aug 10, 12:28 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Cedar, Dakota, Dixon, Knox, Pierce and 2 more | 5 hr |
| Aug 10, 5:03 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Blaine, Brown, Cherry, Custer, Garden and 9 more | 6 hr |
| Aug 10, 2:04 PM CDT | Mesoscale Discussion | SPC | Campbell, Corson, Dewey, Edmunds, McPherson, Potter and 4 more | 116 min |
| Aug 10, 3:41 PM CDT | Severe Thunderstorm Watch | SPC | Brown, Campbell, Corson, Dewey, Edmunds, Faulk and 4 more | 8 hr |
Nearby
Mesoscale Discussions in South Dakota, 2007Mesoscale Discussions in Nebraska, 2007Every mesoscale discussion in 2007
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.