Alert archive / Nebraska / Mesoscale Discussions in 2004
Mesoscale Discussion 1839
The Storm Prediction Center issued this mesoscale discussion at Aug 2, 2004, 4:23 PM CDT for 13 counties in Nebraska; 11 counties in South Dakota. It was in force for 37 min.
The area
The outline as issued.
The facts
- Issued
- Aug 2, 2004, 4:23 PM CDT (21:23 UTC)
- Expired
- Aug 2, 2004, 5:00 PM CDT
- In force
- 37 min
- Issued by
- the Storm Prediction Center
All 24 counties
Antelope County, NE, Boyd County, NE, Brown County, NE, Cedar County, NE, Cherry County, NE, Dixon County, NE, Holt County, NE, Keya Paha County, NE, Knox County, NE, Madison County, NE, Pierce County, NE, Rock County, NE, Wayne County, NE, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Douglas County, SD, Gregory County, SD, Hutchinson County, SD, Mellette County, SD, Todd County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD
The radar
The North Platte radar (KLNX), 153 km from the middle of the area, began a volume at 21:24 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 9.4 hours before the alert went out and 229 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
- 9 J/kg
- Mixed-layer CIN
- -668 J/kg
- Mixed-layer LCL
- 3509 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -9 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
191 ACUS11 KWNS 022124 SWOMCD SPC MCD 022123 NEZ000-SDZ000-022200- MESOSCALE DISCUSSION 1839 NWS STORM PREDICTION CENTER NORMAN OK 0423 PM CDT MON AUG 02 2004 AREAS AFFECTED...PORTIONS OF SRN SD AND NRN NEB CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 022123Z - 022200Z WW MAY BE REQUIRED SOON FOR PORTIONS OF SRN SD AND NRN NEB. VIS IMAGERY SHOWED A TOWERING CU OVER KEYA PAHA COUNTY NEB OR 15 NNE ANW. THIS CONVECTION IS DEVELOPING ALONG A STATIONARY BOUNDARY THAT EXTENDED E-W ALONG THE NEB/SD BORDER...WITH THE AIR MASS ALONG AND EAST OF THIS AREA HAS BECOME VERY TO EXTREMELY UNSTABLE /MLCAPE VALUES RANGING FROM 2500-4000 J/KG/. THE TOWERING CU SUGGESTS THE CAP IS WEAKENING ALONG THIS BOUNDARY AS LARGE SCALE ASCENT SPREADS EWD ACROSS THIS AREA AHEAD OF A SHORT WAVE TROUGH TOPPING THE RIDGE OVER ERN WY ATTM. AS THE SHORT WAVE CONTINUES TO MOVE EWD LATE THIS AFTERNOON AND EVENING...ADDITIONAL STORMS WILL LIKELY DEVELOP ALONG THE STATIONARY BOUNDARY. THE DEGREE OF INSTABILITY AND STRONG DEEP LAYER SHEAR WILL SUPPORT VERY LARGE HAIL AND ISOLATED TORNADOES. ..PETERS.. 08/02/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FSD...OAX...ABR...LBF...UNR... 43660149 43700022 43619746 43249685 42339663 41909742 42010033 42320155
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 1, 10:35 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Boyd, Burt, Cedar, Cuming, Dakota and 9 more | 5 hr |
| Aug 2, 3:02 AM CDT | Mesoscale Discussion | SPC | Antelope, Burt, Cedar, Cuming, Dakota, Dixon and 8 more | 58 min |
| Aug 2, 4:56 AM CDT | Mesoscale Discussion | SPC | Nemaha, Richardson | 94 min |
| Aug 2, 4:55 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Blaine, Boone, Brown, Cedar, Colfax and 15 more | 5 hr |
| Aug 1, 7:22 PM CDT | Mesoscale Discussion | SPC | Beadle, Brookings, Brown, Campbell, Clark, Codington and 17 more | 53 min |
| Aug 1, 7:45 PM CDT | Tornado Watch | SPC | Beadle, Brookings, Brown, Buffalo, Campbell, Clark and 26 more | 6 hr |
| Aug 1, 10:00 PM CDT | Mesoscale Discussion | SPC | Beadle, Buffalo, Campbell, Edmunds, Faulk, Hand and 7 more | 60 min |
| Aug 1, 11:29 PM CDT | Mesoscale Discussion | SPC | Aurora, Beadle, Bon Homme, Brule, Buffalo, Charles Mix and 19 more | 61 min |
| Aug 2, 12:20 AM CDT | Severe Thunderstorm Watch | SPC | Lake, Lincoln, Minnehaha, Moody, Union | 4 hr |
| Aug 2, 3:12 PM CDT | Mesoscale Discussion | SPC | Beadle, Brookings, Clark, Deuel, Hamlin, Jerauld and 7 more | 2 hr |
| Aug 2, 3:50 PM CDT | Severe Thunderstorm Watch | SPC | Brookings, Davison, Hanson, Kingsbury, Lake, McCook and 4 more | 5 hr |
| Aug 2, 6:30 PM CDT | Severe Thunderstorm Watch | SPC | Aurora, Bennett, Bon Homme, Brule, Buffalo, Charles Mix and 17 more | 6 hr |
Nearby
Mesoscale Discussions in Nebraska, 2004Mesoscale Discussions in South Dakota, 2004Every mesoscale discussion in 2004
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.