Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 862

May 8, 200317 counties in Iowa; 48 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 4:18 PM CDT for 17 counties in Iowa; 48 counties in Nebraska. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
May 8, 2003, 4:18 PM CDT (21:18 UTC)
Expired
May 8, 2003, 5:15 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 65 counties

Adair County, IA, Adams County, IA, Audubon County, IA, Carroll County, IA, Cass County, IA, Crawford County, IA, Fremont County, IA, Guthrie County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Union County, IA, Woodbury County, IA, Antelope County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Cherry County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Knox County, NE, Lancaster County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Otoe County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thomas County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, York County, NE

The radar

The Omaha radar (KOAX), 101 km from the middle of the area, began a volume at 21:18 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, 9.3 hours before the alert went out and 101 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 2003-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2003-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1563 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
193 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

773 
ACUS11 KWNS 082119
SWOMCD
SPC MCD 082118 
IAZ000-MOZ000-NEZ000-SDZ000-082215-

MESOSCALE DISCUSSION 0862
NWS STORM PREDICTION CENTER NORMAN OK
0418 PM CDT THU MAY 08 2003

AREAS AFFECTED...SRN NEB AND SWRN IA

CONCERNING...SEVERE THUNDERSTORM POTENTIAL 

VALID 082118Z - 082215Z

...SEVERE THUNDERSTORM WATCH MAY BE NEEDED SHORTLY FOR PORTIONS OF
CENTRAL/NRN NEB AND SWRN IA...


SUPERCELLS OVER NRN KS AND EXTREME SRN NEB WILL SHIFT RAPIDLY NEWD
AS STRONG UPPER JET AND SURFACE/UPPER LOW EJECT NEWD. ALTHOUGH THE
FRONT IS SHIFTING NWD...APPEARS BOUNDARY LAYER WILL REMAIN COOL AND
STABLE WITH THE MAIN THREAT VERY LARGE HAIL.


..IMY.. 05/08/2003

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

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

40759777 40989993 41180130 42680103 42799807 42369584
42019465 40979401 40549575 40829714

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 3:51 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Cass, Clarke, Decatur and 13 more3 hr
May 8, 4:15 AM CDTSevere Thunderstorm WatchSPCAdams, Appanoose, Clarke, Davis, Decatur, Fremont and 7 more7 hr
May 8, 7:50 AM CDTMesoscale DiscussionSPCAdams, Appanoose, Clarke, Davis, Decatur, Fremont and 7 more85 min
May 8, 7:55 AM CDTMesoscale DiscussionSPCAdams, Appanoose, Clarke, Davis, Decatur, Fremont and 7 more95 min
May 8, 3:40 PM CDTTornado WatchSPCLee5 hr
May 8, 5:30 PM CDTSevere Thunderstorm WatchSPCAdair, Adams, Audubon, Carroll, Cass, Crawford and 13 more6 hr
May 7, 7:01 PM CDTMesoscale DiscussionSPCArthur, Chase, Cheyenne, Deuel, Dundy, Garden and 3 more89 min
May 8, 1:10 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Furnas, Hayes, Hitchcock and 1 more2 hr
May 8, 1:30 PM CDTTornado WatchSPCChase, Dawson, Dundy, Frontier, Furnas, Gosper and 4 more6 hr
May 8, 1:50 PM CDTTornado WatchSPCAdams, Clay, Dawson, Fillmore, Franklin, Gage and 13 more7 hr
May 8, 3:26 PM CDTMesoscale DiscussionSPCAdams, Franklin, Gage, Jefferson, Nuckolls, Pawnee and 3 more2 hr
May 8, 3:35 PM CDTMesoscale DiscussionSPCChase, Dundy, Frontier, Furnas, Gosper, Hayes and 3 more115 min
May 8, 6:38 PM CDTMesoscale DiscussionSPCAdams, Clay, Fillmore, Franklin, Gage, Harlan and 11 more2 hr

Nearby

Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Iowa, 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.