Alert archive / Nebraska / Mesoscale Discussions in 2003
Mesoscale Discussion 959
The Storm Prediction Center issued this mesoscale discussion at May 13, 2003, 3:27 PM CDT for 17 counties in Nebraska. It was in force for 93 min.
The area
The outline as issued.
The facts
- Issued
- May 13, 2003, 3:27 PM CDT (20:27 UTC)
- Expired
- May 13, 2003, 5:00 PM CDT
- In force
- 93 min
- Issued by
- the Storm Prediction Center
Counties Antelope County, NE, Boone County, NE, Colfax County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE
The radar
The Omaha radar (KOAX), 161 km from the middle of the area, began a volume at 20:28 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, 8.5 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
- 212 J/kg
- Mixed-layer CIN
- -282 J/kg
- Mixed-layer LCL
- 1567 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 212 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted, in the capitals the NWS used until 2016.
555 ACUS11 KWNS 132028 SWOMCD SPC MCD 132027 NEZ000-SDZ000-132200- MESOSCALE DISCUSSION 0959 NWS STORM PREDICTION CENTER NORMAN OK 0327 PM CDT TUE MAY 13 2003 AREAS AFFECTED...EASTERN NEBRASKA CONCERNING...SEVERE THUNDERSTORM WATCH 360... VALID 132027Z - 132200Z SEVERE STORMS TO MOVE NEWD AT 45 KT. STRONG FORCING ASSOCIATED WITH UPPER TROUGH IN WRN NEB SHOULD MOVE BAND OF STRONG/SEVERE THUNDERSTORMS FROM 50 W OF YKN TO NEAR GRI NEWD AT 40-45 KT. STORMS ARE EXPECTED TO GRADUALLY DEVELOP SWD AND A FEW THUNDERSTORMS DEVELOPING ALONG A COLD FRONT...CURRENTLY LOCATED FROM NEAR 55 E ANW TO 15 E LBF...MAY ALSO INTENSIFY AS THE STORMS MOVE INTO WW AREA. MODERATE INSTABILITY AND DEEP LAYER SHEAR WOULD SUPPORT SOME MID LEVEL ROTATION...BUT ENVIRONMENT APPEARS MORE FAVORABLE FOR LARGE HAIL. ..IMY.. 05/13/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FSD...OAX...GID...LBF... 41519902 42089905 42709910 42799836 42789791 42789756 42709747 42339726 41999722 41549705 41169737 40919803 40919893
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 1:13 PM CDT | Mesoscale Discussion | SPC | Adams, Antelope, Blaine, Boone, Brown, Buffalo and 45 more | 92 min |
| May 13, 1:45 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Antelope, Boone, Buffalo, Butler, Cedar and 38 more | 5 hr |
| May 13, 6:20 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Burt, Butler, Cass, Clay, Dodge and 22 more | 5 hr |
Nearby
Mesoscale Discussions in Nebraska, 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.