Alert archive / South Dakota / Mesoscale Discussions in 2003
Mesoscale Discussion 2136
The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2003, 3:38 PM CDT for 34 counties in South Dakota. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2003, 3:38 PM CDT (20:38 UTC)
- Expired
- Aug 9, 2003, 5:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 34 counties
Aurora County, SD, Beadle County, SD, Bennett County, SD, Brookings County, SD, Brown County, SD, Brule County, SD, Buffalo County, SD, Clark County, SD, Codington County, SD, Day County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Haakon County, SD, Hamlin County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Jackson County, SD, Jerauld County, SD, Jones County, SD, Kingsbury County, SD, Lyman County, SD, Marshall County, SD, Mellette County, SD, Miner County, SD, Potter County, SD, Roberts County, SD, Sanborn County, SD, Spink County, SD, Stanley County, SD, Sully County, SD, Todd County, SD, Tripp County, SD
The radar
The Aberdeen radar (KABR), 160 km from the middle of the area, began a volume at 20:39 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 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, 8.6 hours before the alert went out and 129 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
- 144 J/kg
- Mixed-layer CIN
- -488 J/kg
- Mixed-layer LCL
- 1174 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
499 ACUS11 KWNS 092039 SWOMCD SPC MCD 092038 MNZ000-SDZ000-NDZ000-NEZ000-092245- MESOSCALE DISCUSSION 2136 NWS STORM PREDICTION CENTER NORMAN OK 0338 PM CDT SAT AUG 09 2003 AREAS AFFECTED...SD CONCERNING...SEVERE THUNDERSTORM WATCH 853... VALID 092038Z - 092245Z A BAND OF THUNDERSTORMS IS CONTINUING TO MOVE SEWD ACROSS NERN SD...WITH NEW STORMS DEVELOPING SWWD ALONG A SURFACE CONVERGENCE ZONE ACROSS S CNTRL SD. WINDS HAVE GUSTED TO 45 KT AT 8D3 (SISSETON SD) AND 37 KT AT ABR WITH THE NERN LINE. SURFACE THERMAL AXIS EXTENDS INTO CENTRAL SD INVOF SURFACE LOW NEAR PIR...AND WITH SURFACE DEW POINTS IN THE MID/UPPER 60S AIR MASS ACROSS THE REGION IS MODERATELY UNSTABLE WITH MLCAPE AROUND 2000 J/KG. VAD PROFILE AT ABR EXHIBITS SUFFICIENT VERTICAL SHEAR /45 KT IN THE LOWEST 6 KM/ ASSOCIATED WITH 30-40 KT NWLY MID LEVEL WINDS TO SUPPORT ORGANIZED SEVERE STORMS. ACTIVITY IS EXPECTED TO SPREAD SEWD OVER THE NEXT SEVERAL HOURS WITH AN INCREASING THREAT FOR LARGE HAIL AND DAMAGING WIND GUSTS. ..WEISS.. 08/09/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FGF...FSD...ABR...BIS...LBF...UNR... 44660210 46279678 44199669 42690195
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 11:02 AM CDT | Mesoscale Discussion | SPC | Brown, Campbell, Dewey, Edmunds, Faulk, McPherson and 4 more | 118 min |
| Aug 9, 1:55 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bennett, Brookings, Brown, Brule and 29 more | 5 hr |
| Aug 9, 3:35 PM CDT | Severe Thunderstorm Watch | SPC | Tripp | 5 hr |
| Aug 9, 5:15 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 15 more | 6 hr |
Nearby
Mesoscale Discussions in South Dakota, 2003Every mesoscale discussion in 2003
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.