Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 968

May 22, 20084 states

The Storm Prediction Center issued this mesoscale discussion at May 22, 2008, 3:38 AM CDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued
May 22, 2008, 3:38 AM CDT (08:38 UTC)
Expired
May 22, 2008, 5:15 AM CDT
In force
97 min
Issued by
the Storm Prediction Center
All 110 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Douglas County, KS, Franklin County, KS, Jackson County, KS, Jefferson County, KS, Johnson County, KS, Leavenworth County, KS, Linn County, KS, Marshall County, KS, Miami County, KS, Nemaha County, KS, Osage County, KS, Pottawatomie County, KS, Shawnee County, KS, Washington County, KS, Wyandotte County, KS, Andrew County, MO, Atchison County, MO, Bates County, MO, Benton County, MO, Buchanan County, MO, Caldwell County, MO, Carroll County, MO, Cass County, MO, Chariton County, MO, Clay County, MO, Clinton County, MO, Cooper County, MO, Daviess County, MO, DeKalb County, MO, Gentry County, MO, Harrison County, MO, Henry County, MO, Holt County, MO, Howard County, MO, Jackson County, MO, Johnson County, MO, Lafayette County, MO, Livingston County, MO, Morgan County, MO, Nodaway County, MO, Pettis County, MO, Platte County, MO, Ray County, MO, Saline County, MO, St. Clair County, MO, Vernon County, MO, Worth County, MO, Adams County, NE, Antelope County, NE, Blaine County, NE, Boone County, NE, Brown County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Custer County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Gage County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Howard County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Richardson County, NE, Rock County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer 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), 127 km from the middle of the area, began a volume at 08:41 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 00:00Z, 8.6 hours before the alert went out and 127 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 00:00Z on 2008-05-22Temperature 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 00:00Z on 2008-05-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -70 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2684 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-70 m²/s²
0-3 km storm-relative helicity
101 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.

000 
ACUS11 KWNS 220839
SWOMCD
SPC MCD 220838 
MOZ000-IAZ000-KSZ000-NEZ000-221015-

MESOSCALE DISCUSSION 0968
NWS STORM PREDICTION CENTER NORMAN OK
0338 AM CDT THU MAY 22 2008

AREAS AFFECTED...NEB...PARTS OF NRN/ERN KS...INTO PARTS OF SW IA/WRN
MO

CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY 

VALID 220838Z - 221015Z

INCREASE/INTENSIFICATION OF THUNDERSTORM ACTIVITY...NOW WELL
UNDERWAY ACROSS THE CENTRAL PLAINS AND MID MISSOURI VALLEY...
APPEARS TO BE LARGELY FOCUSED ALONG ZONE OF STRONGER WARM ADVECTION
CENTERED AROUND THE 700 MB LEVEL.  MODELS ARE SUGGESTIVE THAT
ACTIVITY MAY BE ENHANCED BY AN IMPULSE EMERGING FROM THE WESTERN
U.S. UPPER TROUGH...WHICH IS LIKELY TO UNDERGO SUBSTANTIAL
DEFORMATION AS IT LIFTS NORTHEASTWARD THROUGH NEBRASKA BETWEEN NOW
AND THE 12-15Z TIME FRAME.  

INITIALLY WEAK TO MODERATE CAPE FOR PARCELS WITH ELEVATED LEVELS OF
FREE CONVECTION MAY STILL INCREASE EARLY THIS MORNING...AS LOW-LEVEL
MOISTURE LEVELS CONTINUE TO RISE IN ASSOCIATION WITH NOCTURNAL
VEERING OF THE SOUTHERLY LOW-LEVEL JET.  AND...THIS COULD SUPPORT
INCREASING NUMBERS OF STORMS CAPABLE OF PRODUCING LARGE HAIL AT
LEAST FOR AT LEAST A BRIEF PERIOD THROUGH DAYBREAK...BEFORE
WEAKENING TRENDS LIKELY ENSUE.  DEEP LAYER SHEAR BENEATH BROADER
SCALE MID/UPPER RIDGING IS NOT STRONG...BUT MODERATE INFLOW LAYER
WINDS...VEERING WITH HEIGHT...ARE SUFFICIENT FOR UPDRAFT ROTATION.

..KERR.. 05/22/2008

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

ATTN...WFO...LSX...SGF...DMX...EAX...FSD...OAX...TOP...GID...LBF...

41520075 42769991 42759829 42149624 40819457 39369263
38719256 37919335 37839452 38469561 39079600 39519694

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 21, 7:17 PM CDTMesoscale DiscussionSPCGrant, Haskell, Meade, Morton, Seward, Stanton and 1 more118 min
May 22, 1:29 PM CDTMesoscale DiscussionSPCCheyenne, Clark, Comanche, Decatur, Finney, Ford and 16 more61 min
May 22, 1:52 PM CDTTornado Watch PDSSPCBarber, Cheyenne, Clark, Comanche, Decatur, Edwards and 33 more10 hr
May 22, 4:02 PM CDTMesoscale DiscussionSPCBarber, Cheyenne, Clark, Comanche, Decatur, Edwards and 31 more58 min
May 22, 6:46 PM CDTMesoscale DiscussionSPCBarber, Barton, Cheyenne, Clark, Comanche, Decatur and 35 more59 min
May 21, 8:40 PM CDTMesoscale DiscussionSPCBanner, Box Butte, Cheyenne, Dawes, Deuel, Kimball and 3 more65 min
May 21, 10:35 PM CDTMesoscale DiscussionSPCBanner, Cheyenne, Kimball, Morrill, Scotts Bluff25 min
May 22, 12:25 PM CDTTornado WatchSPCCheyenne, Kimball9 hr
May 22, 2:29 PM CDTMesoscale DiscussionSPCArthur, Banner, Box Butte, Cheyenne, Deuel, Frontier and 9 more61 min
May 22, 3:13 PM CDTTornado WatchSPCChase, Deuel, Frontier, Hayes, Keith, Lincoln and 1 more7 hr
May 22, 3:22 PM CDTSevere Thunderstorm WatchSPCArthur, Banner, Blaine, Box Butte, Brown, Cherry and 15 more7 hr

Nearby

Mesoscale Discussions in Nebraska, 2008Mesoscale Discussions in Missouri, 2008Mesoscale Discussions in Kansas, 2008Every mesoscale discussion in 2008

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.