Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 488

April 18, 20034 states

The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2003, 7:33 PM CDT for 4 states. It was in force for 57 min.

The area

The outline as issued.

The facts

Issued
Apr 18, 2003, 7:33 PM CDT (00:33 UTC)
Expired
Apr 18, 2003, 8:30 PM CDT
In force
57 min
Issued by
the Storm Prediction Center
All 21 counties

Fremont County, IA, Mills County, IA, Page County, IA, Taylor County, IA, Atchison County, KS, Brown County, KS, Doniphan County, KS, Jefferson County, KS, Andrew County, MO, Atchison County, MO, Buchanan County, MO, Holt County, MO, Nodaway County, MO, Platte County, MO, Cass County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Richardson County, NE, Sarpy County, NE

The radar

The Topeka radar (KTWX), 129 km from the middle of the area, began a volume at 00:36 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

Topeka, KS (KTOP), launched 00:00Z, 0.6 hours before the alert went out and 117 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, Topeka, KS at 00:00Z on 2003-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 987 joules per kilogram.LCLEL10008507005003002001001 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, Topeka, KS at 00:00Z on 2003-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 205 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
987 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
1888 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
205 m²/s²
0-3 km storm-relative helicity
302 m²/s²
Significant tornado parameter
0.2
Supercell composite
9.8

Open this sounding in Storm Lab

The text

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

976 
ACUS11 KWNS 190034
SWOMCD
SPC MCD 190033 
MOZ000-IAZ000-KSZ000-NEZ000-190130-

MESOSCALE DISCUSSION 0488
NWS STORM PREDICTION CENTER NORMAN OK
0733 PM CDT FRI APR 18 2003

AREAS AFFECTED...NERN KS...EXTREME NWRN MO...EXTREME SWRN IA AND
SERN NEB

CONCERNING...TORNADO WATCH 126...

VALID 190033Z - 190130Z

VWP/PROFILER DATA INDICATES THAT LLJ AXIS IS REDEVELOPING EWD
ACROSS MO INTO SRN IA AHEAD OF THE VORT MAX TRANSLATING ENEWD
ACROSS ECNTRL NEB.  AS A RESULT...WARM ADVECTION IS BEGINNING TO
AID IN TSTM INTENSIFICATION WELL NORTHEAST OF WT 126.  IT APPEARS
THAT THE TORNADO THREAT IS DECREASING ALONG THE MO RVR AND IT IS
LIKELY THAT THE WW WILL BE CANCELLED EARLY.

ANOTHER MESOSCALE DISCUSSION WBIS SHORTLY FOR WS 127...ADDRESSING
SEVERE TSTM THREAT ACROSS CNTRL IA.


..RACY.. 04/19/2003

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

ATTN...WFO...DMX...EAX...OAX...TOP...

39119563 39939574 40869715 41219593 40829455 39349459

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 7:48 PM CDTMesoscale DiscussionSPCAdair, Audubon, Boone, Calhoun, Carroll, Cass and 24 more87 min
Apr 18, 9:56 PM CDTMesoscale DiscussionSPCCrawford, Harrison, Ida, Monona, Pottawattamie, Sac and 2 more64 min
Apr 19, 12:15 PM CDTMesoscale DiscussionSPCBenton, Black Hawk, Bremer, Buchanan, Cedar, Clinton and 20 more3 hr
Apr 18, 11:08 PM CDTMesoscale DiscussionSPCButler, Chase, Coffey, Douglas, Franklin, Harvey and 12 more2 hr
Apr 19, 12:58 AM CDTMesoscale DiscussionSPCBarber, Comanche, Harper, Kingman, Sumner2 hr
Apr 19, 1:25 AM CDTSevere Thunderstorm WatchSPCBarber, Butler, Chautauqua, Comanche, Cowley, Edwards and 11 more7 hr
Apr 19, 3:18 AM CDTMesoscale DiscussionSPCBourbon, Chautauqua, Cherokee, Crawford, Labette, Montgomery and 2 more117 min
Apr 19, 4:52 AM CDTMesoscale DiscussionSPCBarber, Butler, Comanche, Cowley, Greenwood, Harper and 7 more113 min
Apr 19, 9:01 AM CDTMesoscale DiscussionSPCBourbon, Cherokee, Crawford, Labette, Linn3 hr
Apr 19, 1:10 PM CDTMesoscale DiscussionSPCBarber, Comanche, Harper, Kingman, Pratt, Sedgwick and 1 more2 hr
Apr 19, 1:15 PM CDTTornado WatchSPCBarber, Clark, Comanche, Cowley, Harper, Kingman and 2 more7 hr
Apr 19, 2:30 PM CDTTornado WatchSPCButler, Chautauqua, Cherokee, Cowley, Crawford, Elk and 4 more7 hr
Apr 19, 4:58 PM CDTMesoscale DiscussionSPCAnderson, Chase, Coffey, Douglas, Franklin, Greenwood and 9 more92 min
Apr 19, 5:25 PM CDTSevere Thunderstorm WatchSPCAnderson, Coffey, Douglas, Franklin, Greenwood, Johnson and 7 more6 hr
Apr 19, 5:50 PM CDTMesoscale DiscussionSPCHarper, Kingman, Sumner85 min
Apr 19, 6:07 PM CDTMesoscale DiscussionSPCChautauqua, Cherokee, Cowley, Crawford, Elk, Labette and 3 more83 min
Apr 19, 6:55 PM CDTSevere Thunderstorm WatchSPCBourbon, Cherokee, Crawford5 hr

Nearby

Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Missouri, 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.