Alert archive / Nebraska / Mesoscale Discussions in 2011
Mesoscale Discussion 1949
The Storm Prediction Center issued this mesoscale discussion at Aug 11, 2011, 9:22 PM CDT for 14 counties in Nebraska. It was in force for 53 min.
The area
The outline as issued.
The facts
- Issued
- Aug 11, 2011, 9:22 PM CDT (02:22 UTC)
- Expired
- Aug 11, 2011, 10:15 PM CDT
- In force
- 53 min
- Issued by
- the Storm Prediction Center
Counties Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Wheeler County, NE
The radar
The North Platte radar (KLNX), 70 km from the middle of the area, began a volume at 02:26 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 nearest sounding before it
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.4 hours before the alert went out and 144 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
- 2513 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 1288 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 281 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 19.6
The text
As transmitted, in the capitals the NWS used until 2016.
930
ACUS11 KWNS 120222
SWOMCD
SPC MCD 120222
SDZ000-NEZ000-120315-
MESOSCALE DISCUSSION 1949
NWS STORM PREDICTION CENTER NORMAN OK
0922 PM CDT THU AUG 11 2011
AREAS AFFECTED...NE
CONCERNING...TORNADO WATCH 767...
VALID 120222Z - 120315Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 767 CONTINUES.
INTENSE SUPERCELLS HAVE PRODUCED SEVERAL TORNADO REPORTS ON THE TAIL
END OF THE SEVERE QLCS MOVING INTO NRN NEB THIS EVENING. NORTH
PLATTE VWP INFORMATION UPDATED WITH ESTIMATED STORM MOTION VECTOR OF
315 AT 34KT RESULTS IN 0-1KM SRH NEARING 700 M2/S2 ALONG AND AHEAD
OF THE THREE OR FOUR TAIL-END SUPERCELLS. THESE STORMS CONTINUE
SPREADING INTO A ZONE WHERE ABUNDANT INSTABILITY IS INDICATED BY
LATEST OBJECTIVE ANALYSIS DATA. THUS...WOULD EXPECT A HIGH
PROBABILITY OF ALL SEVERE WEATHER TYPES...DAMAGING WINDS... LARGE
HAIL...AND TORNADOES...TO CONTINUE...PRIMARILY ACROSS CENTRAL AND
ERN AREAS OF TORNADO WATCH 767 OVER THE NEXT 1-2 HOURS.
..CARBIN.. 08/12/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FSD...GID...LBF...
LAT...LON 42940275 42989834 41719834 41720203 41970202 41990267
42940275SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 7:19 PM CDT | Severe Thunderstorm Watch | SPC | Antelope, Boone, Burt, Cedar, Colfax, Cuming and 9 more | 5 hr |
| Aug 11, 9:42 PM CDT | Mesoscale Discussion | SPC | Antelope, Boone, Burt, Cedar, Colfax, Cuming and 12 more | 63 min |
| Aug 11, 10:16 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Clay, Dawson, Fillmore, Gosper and 12 more | 6 hr |
| Aug 12, 1:45 AM CDT | Mesoscale Discussion | SPC | Adams, Blaine, Buffalo, Cherry, Clay, Custer and 27 more | 2 hr |
Nearby
Mesoscale Discussions in Nebraska, 2011Every mesoscale discussion in 2011
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.