Alert archive / Nebraska / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 438

June 12, 2000Plymouth County, Iowa; 29 counties in Nebraska; 4 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 12, 2000, 11:00 PM CDT for Plymouth County, Iowa; 29 counties in Nebraska; 4 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jun 12, 2000, 11:00 PM CDT (04:00 UTC)
Expired: Jun 13, 2000, 4:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 34 counties

Plymouth County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cedar 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, Knox County, NE, Lancaster 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, Stanton County, NE, Thurston County, NE, Wayne County, NE, Wheeler County, NE, York County, NE, Bon Homme County, SD, Clay County, SD, Union County, SD, Yankton County, SD

The radar

The Omaha radar (KOAX), 117 km from the middle of the area, began a volume at 03:55 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

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

Issued	Product	Office	Counties	Lasted
Jun 12, 11:38 PM CDT	Severe Thunderstorm Warning	OAX	Antelope, Knox	37 min
Jun 13, 12:15 AM CDT	Severe Thunderstorm Warning	GID	Merrick, Nance	45 min
Jun 13, 12:39 AM CDT	Severe Thunderstorm Warning	OAX	Platte	36 min
Jun 13, 2:23 AM CDT	Severe Thunderstorm Warning	OAX	Saunders	37 min

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 4.0 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2610 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1924 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

219 
WWUS9 KMKC 130356
SEL8  

SEL8  
MKC WW 130356
NEZ000-130900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 438
STORM PREDICTION CENTER NORMAN OK
1056 PM CDT MON JUN 12 2000

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   EASTERN AND NORTHERN NEBRASKA                           

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1100 PM UNTIL
400 AM CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES EAST SOUTHEAST OF GRAND
ISLAND NEBRASKA TO 10 MILES NORTHEAST OF YANKTON SOUTH DAKOTA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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...  CONTINUE...WW 434...WW 435...WW
436...WW 437...

DISCUSSION...CNTRL NEB MCS EXPECTED TO MOVE GENERALLY ENE THROUGH
EARLY TUESDAY AS STRONGEST NEW CELL DEVELOPMENT OCCURS ON ERN EDGE
OF COLD POOL.  WHILE VERTICAL SHEAR IS ONLY MARGINALLY SUFFICIENT
FOR SMALL SCALE BOW DEVELOPMENT...SUPPLY OF RICH BOUNDARY LAYER
MOISTURE SUGGESTS THAT NEW CELL INITIATION WILL LIKELY CONTINUE FOR
AT LEAST A FEW MORE HOURS.     

AVIATION...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 500.  MEAN STORM
MOTION VECTOR 24035.

...CORFIDI

430,0960 404,0962 404,0984 430,0982

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 13, 11:45 AM CDT	Severe Thunderstorm Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Calhoun and 40 more	5 hr
Jun 13, 2:00 PM CDT	Tornado Watch	SPC	Adair, Adams, Audubon, Boone, Calhoun, Carroll and 18 more	6 hr
Jun 13, 2:15 PM CDT	Severe Thunderstorm Watch	SPC	Benton, Buchanan, Cedar, Clinton, Delaware, Des Moines and 8 more	6 hr
Jun 13, 5:30 PM CDT	Tornado Watch	SPC	Adair, Adams, Allamakee, Appanoose, Benton, Black Hawk and 41 more	7 hr
Jun 12, 7:15 PM CDT	Severe Thunderstorm Watch	SPC	Blaine, Boyd, Brown, Buffalo, Custer, Dawson and 17 more	6 hr
Jun 12, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Aurora, Beadle, Brookings, Brown, Brule, Buffalo and 43 more	5 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2000 Severe Thunderstorm Watches in South Dakota, 2000 Severe Thunderstorm Watches in Iowa, 2000 Every severe thunderstorm watch in 2000

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.