Alert archive / Nebraska / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 70

March 7, 2000Phillips County, Sedgwick County, Yuma County, Colorado; 19 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Mar 7, 2000, 1:00 PM MST for Phillips County, Sedgwick County, Yuma County, Colorado; 19 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Mar 7, 2000, 1:00 PM MST (20:00 UTC)
Expired: Mar 7, 2000, 6:00 PM MST
In force: 5 hr
Issued by: the Storm Prediction Center

All 22 counties

Phillips County, CO, Sedgwick County, CO, Yuma County, CO, Arthur County, NE, Chase County, NE, Cherry County, NE, Deuel County, NE, Dundy County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE, Sheridan County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 50 km from the middle of the area, began a volume at 20:02 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

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

Issued	Product	Office	Counties	Lasted
Mar 7, 1:43 PM MST	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	62 min
Mar 7, 2:03 PM MST	Severe Thunderstorm Warning	GLD	Kit Carson, Yuma	47 min
Mar 7, 2:49 PM MST	Severe Thunderstorm Warning	GLD	Kit Carson, Yuma	61 min
Mar 7, 3:42 PM MST	Severe Thunderstorm Warning	GLD	Yuma	58 min
Mar 7, 3:43 PM MST	Severe Thunderstorm Warning	BOU	Phillips	32 min
Mar 7, 3:47 PM MST	Tornado Warning	GLD	Yuma	13 min
Mar 7, 4:01 PM MST	Severe Thunderstorm Warning	LBF	Chase, Perkins	59 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.0 hours before the alert went out and 95 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: 65 J/kg
Mixed-layer CIN: -409 J/kg
Mixed-layer LCL: 1112 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 95 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.

970 
WWUS9 KMKC 071929
SEL0  

SEL0  
MKC WW 071929
NEZ000-080100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 70
STORM PREDICTION CENTER NORMAN OK
129 PM CST TUE MAR 7 2000

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

   WESTERN NEBRASKA                           

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 200 PM UNTIL 700
PM CST.

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 50 MILES WEST NORTHWEST OF VALENTINE
NEBRASKA TO 40 MILES SOUTH SOUTHEAST OF IMPERIAL NEBRASKA.

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 68...WW 69...

DISCUSSION...STORMS CONTINUE TO DEVELOP IN ERN CO AND MOVE NNEWD
VICINITY STATIONARY FRONT INTO WRN NEB.  AIRMASS ACROSS WRN NEB E
OF FRONTAL ZONE IS MODERATELY UNSTABLE WITH CAPES TO 2000 J/KG. 
LARGE HAIL WILL BE PRIMARY SEVERE THREAT WITH THESE STORMS AS THEY
DEVELOP N AND NE ACROSS WRN NEB.


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 450.  MEAN STORM
MOTION VECTOR 22035.


...HALES

430,1001 395,1001 395,1022 430,1023

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 7, 9:45 AM MST	Severe Thunderstorm Watch	SPC	Baca, Bent, Cheyenne, Crowley, Kiowa, Kit Carson and 8 more	5 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2000 Severe Thunderstorm Watches in Colorado, 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.