Alert archive / Nebraska / Mesoscale Discussions in 2012
Mesoscale Discussion 883
The Storm Prediction Center issued this mesoscale discussion at May 23, 2012, 6:49 PM CDT for 17 counties in Iowa; 18 counties in Nebraska. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- May 23, 2012, 6:49 PM CDT (23:49 UTC)
- Expired
- May 23, 2012, 8:15 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
All 35 counties
Buena Vista County, IA, Calhoun County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Harrison County, IA, Ida County, IA, Kossuth County, IA, Monona County, IA, Palo Alto County, IA, Pocahontas County, IA, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Woodbury County, IA, Burt County, NE, Butler County, NE, Cass County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nuckolls County, NE, Otoe County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Washington County, NE
The radar
The Omaha radar (KOAX), 94 km from the middle of the area, began a volume at 23:50 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
Omaha, NE (KOAX), launched 12:00Z, 11.8 hours before the alert went out and 94 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1627 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 271 m²/s²
- 0-3 km storm-relative helicity
- 363 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
025
ACUS11 KWNS 232350
SWOMCD
SPC MCD 232349
MNZ000-IAZ000-NEZ000-KSZ000-240115-
MESOSCALE DISCUSSION 0883
NWS STORM PREDICTION CENTER NORMAN OK
0649 PM CDT WED MAY 23 2012
AREAS AFFECTED...ERN NEB/WRN IA
CONCERNING...SEVERE THUNDERSTORM WATCH 293...
VALID 232349Z - 240115Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 293
CONTINUES.
SUMMARY...SEVERE THREAT CONTINUES WITHIN WW 293.
DISCUSSION...RADAR LOOP SHOWS SCATTERED STRONG/ISOLATED SEVERE
STORMS ONGOING WITHIN A BAND CENTERED ON THE MO VALLEY OF ERN
NEB/WRN IA...JUST AHEAD OF THE SURFACE FRONT. WITH THE AIRMASS
ACROSS THIS REGION STILL AMPLY UNSTABLE /MIXED-LAYER CAPE 500 TO
1500 J/KG/ AHEAD OF THE FRONT AND SHEAR FAVORABLE FOR
ORGANIZED/ROTATING STORMS...THREAT FOR ISOLATED LARGE HAIL/DAMAGING
WINDS WILL CONTINUE FOR THE NEXT COUPLE OF HOURS. SOME DECREASE IN
THREAT SHOULD BEGIN THEREAFTER...AS DIURNAL BOUNDARY-LAYER
STABILIZATION BEGINS.
..GOSS.. 05/23/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MPX...DMX...FSD...OAX...TOP...GID...
LAT...LON 43519412 42779429 40179638 39939781 40109831 42769572
43479518 43519412SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 2:56 PM CDT | Mesoscale Discussion | SPC | Buena Vista, Carroll, Cherokee, Clay, Crawford, Harrison and 11 more | 94 min |
| May 23, 4:07 PM CDT | Severe Thunderstorm Watch | SPC | Audubon, Buena Vista, Calhoun, Carroll, Cherokee, Clay and 23 more | 7 hr |
Nearby
Mesoscale Discussions in Nebraska, 2012Mesoscale Discussions in Iowa, 2012Every mesoscale discussion in 2012
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.