Alert archive / Nebraska / Mesoscale Discussions in 2003
Mesoscale Discussion 2134
The Storm Prediction Center issued this mesoscale discussion at Aug 9, 2003, 1:52 PM MDT for Sedgwick County, Colorado; 16 counties in Nebraska. It was in force for 113 min.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2003, 1:52 PM MDT (19:52 UTC)
- Expired
- Aug 9, 2003, 3:45 PM MDT
- In force
- 113 min
- Issued by
- the Storm Prediction Center
Counties Sedgwick County, CO, Arthur County, NE, Box Butte County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Logan County, NE, McPherson County, NE, Morrill County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE
The radar
The North Platte radar (KLNX), 108 km from the middle of the area, began a volume at 19:56 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 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, 7.9 hours before the alert went out and 154 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
- 73 J/kg
- Mixed-layer CIN
- -344 J/kg
- Mixed-layer LCL
- 1353 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 49 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
The text
As transmitted, in the capitals the NWS used until 2016.
947 ACUS11 KWNS 091952 SWOMCD SPC MCD 091952 NEZ000-SDZ000-COZ000-092145- MESOSCALE DISCUSSION 2134 NWS STORM PREDICTION CENTER NORMAN OK 0252 PM CDT SAT AUG 09 2003 AREAS AFFECTED...WRN/CENTRAL NEB...EXTREME NERN CO CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 091952Z - 092145Z THUNDERSTORMS ARE EXPECTED TO CONTINUE DEVELOPING OVER PARTS OF WRN/N CNTRL NEB AND AREA IS BEING MONITORED FOR A WW. ISOLATED HIGH-BASED THUNDERSTORMS ARE DEVELOPING ACROSS PARTS OF THE NEB PANHANDLE NEAR SURFACE WIND SHIFT LINE EXTENDING FROM WRN CHERRY COUNTY INTO SCOTTS BLUFF COUNTY. VERY STEEP LAPSE RATES NEAR 8.5 C/KM COUPLED WITH SURFACE DEW POINTS IN THE LOW 60S SOUTHEAST OF THE WIND SHIFT LINE ARE RESULTING IN MODERATE INSTABILITY WITH MLCAPE OF 1500-2500 J/KG. VISIBLE IMAGERY SHOWS CU STREETS BECOMING APPARENT ACROSS THE SERN PANHANDLE SUGGESTING THE CAP IS WEAKENING AND ADDITIONAL THUNDERSTORMS MAY DEVELOP OVER THE NEXT 2 HOURS. ALTHOUGH WINDS ALOFT ARE RELATIVELY WEAK ATTM /RUC HOURLY ANALYSIS INDICATES 10-15 KT AT 500 MB/...THE MID LEVEL FLOW IS FORECAST TO INCREASE TO AROUND 20 KT LATER THIS AFTERNOON WITH AN INCREASE IN DIRECTIONAL SHEAR WITH HEIGHT AS THE LOW LEVEL FLOW BACKS. POTENTIAL FOR SEVERE STORMS IS EXPECTED TO GRADUALLY INCREASE AND AREA IS BEING MONITORED FOR POSSIBLE WW. ..WEISS.. 08/09/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LBF...UNR...BOU...CYS... 43040278 43080118 42890014 42430005 41540044 40540160 40680288 41430364 42710318
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 2:35 PM MDT | Severe Thunderstorm Watch | SPC | Sedgwick | 5 hr |
| Aug 9, 4:15 PM MDT | Severe Thunderstorm Watch | SPC | Antelope, Boone, Boyd, Cedar, Garfield, Greeley and 9 more | 6 hr |
Nearby
Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Colorado, 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.