Alert archive / Nebraska / Mesoscale Discussions in 2005

Mesoscale Discussion 2313

October 4, 200520 counties in Iowa; 33 counties in Nebraska; Union County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at Oct 4, 2005, 4:02 PM CDT for 20 counties in Iowa; 33 counties in Nebraska; Union County, South Dakota. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued
Oct 4, 2005, 4:02 PM CDT (21:02 UTC)
Expired
Oct 4, 2005, 6:00 PM CDT
In force
118 min
Issued by
the Storm Prediction Center
All 54 counties

Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dickinson County, IA, Emmet County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Sac County, IA, Sioux County, IA, Woodbury County, IA, Adams County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Kearney County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Union County, SD

The radar

The Omaha radar (KOAX), 96 km from the middle of the area, began a volume at 21:05 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

Omaha, NE (KOAX), launched 12:00Z, 9.0 hours before the alert went out and 96 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.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2005-10-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 780 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2005-10-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 355 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
780 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
836 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
355 m²/s²
0-3 km storm-relative helicity
345 m²/s²
Significant tornado parameter
0.4
Supercell composite
8.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
ACUS11 KWNS 042102
SWOMCD
SPC MCD 042102 
IAZ000-NEZ000-SDZ000-042300-

MESOSCALE DISCUSSION 2313
NWS STORM PREDICTION CENTER NORMAN OK
0402 PM CDT TUE OCT 04 2005

AREAS AFFECTED...ECNTRL NEB...NW IA

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 042102Z - 042300Z

THE STRONGER CELLS ACROSS ECNTRL NEB AND NW IA WILL HAVE POTENTIAL
FOR WIND DAMAGE AND LARGE HAIL THIS AFTERNOON. A SEVERE THUNDERSTORM
WATCH WILL BE ISSUED SHORTLY ACROSS THE REGION.

A SHORTWAVE TROUGH IS EVIDENT ON WATER VAPOR IMAGERY OVER ERN CO AND
WCNTRL NEB. LIFT AHEAD OF THIS FEATURE WILL SUPPORT SCATTERED TO
NUMEROUS THUNDERSTORMS LATE THIS AFTERNOON ALONG A NEARLY STATIONARY
FRONT EXTENDING NEWD FROM SRN NEB INTO SW MN. SOUTHEAST OF THE
BOUNDARY...MODERATE INSTABILITY IS PRESENT WITH MUCAPE VALUES IN THE
1500 TO 2500 J/KG RANGE. IN ADDITION...VAD WIND PROFILERS NEAR THE
BOUNDARY SHOW 45 TO 55 KT OF VERTICAL SHEAR SUGGESTING THE
ENVIRONMENT WILL BE FAVORABLE FOR ISOLATED SUPERCELLS. THE MOST
PROMINENT SEVERE WEATHER THREAT WILL BE LARGE HAIL AND ISOLATED WIND
DAMAGE.

..BROYLES.. 10/04/2005

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...DMX...FSD...OAX...GID...LBF...

42989670 43439575 43499508 43349437 43119411 42759402
42189458 41179639 40389795 40289889 40789935 41379936
41889869 42179797

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 4, 3:28 PM CDTMesoscale DiscussionSPCAllamakee, Howard, Winneshiek2 hr
Oct 4, 4:05 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 11 more7 hr
Oct 4, 5:28 PM CDTMesoscale DiscussionSPCBuena Vista, Cherokee, Clay, Dickinson, Emmet, Ida and 11 more3 hr
Oct 4, 6:59 PM CDTMesoscale DiscussionSPCButte, Harding, Lawrence, Perkins5 hr

Nearby

Mesoscale Discussions in Nebraska, 2005Mesoscale Discussions in Iowa, 2005Mesoscale Discussions in South Dakota, 2005Every mesoscale discussion in 2005

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.