Alert archive / Nebraska / Tornado Watches in 2003

Tornado Watch 693

July 8, 200348 counties in Nebraska; 22 counties in South Dakota

The Storm Prediction Center issued this tornado watch at Jul 8, 2003, 11:45 PM CDT for 48 counties in Nebraska; 22 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jul 8, 2003, 11:45 PM CDT (04:45 UTC)
Expired
Jul 9, 2003, 5:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 70 counties

Adams County, NE, Antelope County, NE, Blaine County, NE, Boone County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Butler County, NE, Cedar County, NE, Cherry County, NE, Clay County, NE, Colfax County, NE, Custer County, NE, Dawson County, NE, Fillmore County, NE, Garfield County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Holt County, NE, Hooker County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Keya Paha County, NE, Knox County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, McPherson County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Rock County, NE, Saline County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Thayer County, NE, Thomas County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Aurora County, SD, Bon Homme County, SD, Brule County, SD, Buffalo County, SD, Charles Mix County, SD, Clay County, SD, Davison County, SD, Douglas County, SD, Gregory County, SD, Hanson County, SD, Hughes County, SD, Hutchinson County, SD, Jerauld County, SD, Jones County, SD, Lyman County, SD, McCook County, SD, Mellette County, SD, Stanley County, SD, Todd County, SD, Tripp County, SD, Turner County, SD, Yankton County, SD

The radar

The North Platte radar (KLNX), 123 km from the middle of the area, began a volume at 04:44 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.

Warnings issued inside it

20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 8, 11:50 PM CDTTornado WarningLBFLogan40 min
Jul 9, 12:15 AM CDTTornado WarningLBFLincoln30 min
Jul 9, 12:30 AM CDTTornado WarningLBFLogan30 min
Jul 9, 12:34 AM CDTSevere Thunderstorm WarningLBFBlaine, Custer, Garfield, Holt, Loup, Wheeler56 min
Jul 9, 12:39 AM CDTSevere Thunderstorm WarningGIDValley66 min
Jul 9, 12:53 AM CDTSevere Thunderstorm WarningGIDGreeley67 min
Jul 9, 12:55 AM CDTSevere Thunderstorm WarningGIDSherman65 min
Jul 9, 1:01 AM CDTTornado WarningGIDSherman, Valley59 min
Jul 9, 1:03 AM CDTTornado WarningLBFCuster27 min
Jul 9, 1:21 AM CDTSevere Thunderstorm WarningGIDHoward54 min
Jul 9, 1:26 AM CDTSevere Thunderstorm WarningOAXAntelope, Pierce49 min
Jul 9, 1:35 AM CDTSevere Thunderstorm WarningGIDMerrick, Nance55 min
Jul 9, 1:38 AM CDTSevere Thunderstorm WarningOAXBoone52 min
Jul 9, 2:01 AM CDTSevere Thunderstorm WarningOAXCedar44 min
Jul 9, 2:04 AM CDTSevere Thunderstorm WarningFSDAurora26 min
Jul 9, 2:08 AM CDTSevere Thunderstorm WarningLBFBlaine, Custer, Loup, Thomas67 min
Jul 9, 2:11 AM CDTSevere Thunderstorm WarningGIDPolk64 min
Jul 9, 2:13 AM CDTSevere Thunderstorm WarningGIDPolk62 min
Jul 9, 2:17 AM CDTSevere Thunderstorm WarningOAXColfax, Platte58 min
Jul 9, 3:16 AM CDTSevere Thunderstorm WarningLBFBlaine, Custer, Garfield, Loup59 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 4.8 hours before the alert went out and 204 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, N. Platte/Lee Bi, NE at 00:00Z on 2003-07-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2953 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, N. Platte/Lee Bi, NE at 00:00Z on 2003-07-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 61 square meters per square second.19395878Sfc1 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
2953 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
1593 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
61 m²/s²
0-3 km storm-relative helicity
228 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.5

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 090446
SEL3  
SPC WW 090445
NEZ000-SDZ000-091000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 693 
NWS STORM PREDICTION CENTER NORMAN OK 
1145 PM CDT TUE JUL 8 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       CENTRAL AND EASTERN NEBRASKA
       SOUTHERN AND EASTERN SOUTH DAKOTA

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1145 PM
UNTIL 500 AM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 130 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 45 MILES WEST OF VALENTINE NEBRASKA TO 30
MILES EAST SOUTHEAST OF NORFOLK NEBRASKA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 691. WATCH NUMBER 691 WILL NOT BE IN EFFECT AFTER
1145 PM CDT. CONTINUE...WW 692...


DISCUSSION...MCSS OVER S CNTRL SD AND CNTRL NEB...BOTH WITH EMBEDDED
SUPERCELLS...EXPECTED TO CONTINUE ESE THROUGH EARLY WEDNESDAY. 
SHEAR/INSTABILITY CONSIDERATIONS SUGGEST CONTINUE EVOLUTION TOWARD
BOW-TYPE STRUCTURES WITH HIGH WIND/HAIL AND POSSIBLE TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 30030.


...CORFIDI

444,1012 434,0965 395,0965 405,1012

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 8, 8:45 PM CDTTornado WatchSPCAntelope, Blaine, Boyd, Brown, Cedar, Cherry and 16 more5 hr
Jul 8, 11:30 PM CDTMesoscale DiscussionSPCBoone, Buffalo, Burt, Butler, Cherry, Clay and 28 more60 min
Jul 9, 1:10 AM CDTSevere Thunderstorm WatchSPCBurt, Cass, Dakota, Dodge, Douglas, Otoe and 4 more6 hr
Jul 9, 2:54 AM CDTMesoscale DiscussionSPCAdams, Antelope, Boone, Boyd, Buffalo, Butler and 29 more96 min
Jul 9, 4:15 AM CDTMesoscale DiscussionSPCCass, Douglas, Sarpy, Washington2 hr
Jul 9, 2:10 PM CDTMesoscale DiscussionSPCRichardson35 min
Jul 9, 3:55 PM CDTSevere Thunderstorm WatchSPCNemaha, Richardson6 hr

Nearby

Tornado Watches in Nebraska, 2003Tornado Watches in South Dakota, 2003Every tornado watch 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.