Alert archive / Nebraska / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 623

July 26, 200013 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 26, 2000, 4:45 PM MDT for 13 counties in Nebraska. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Jul 26, 2000, 4:45 PM MDT (22:45 UTC)
Expired: Jul 26, 2000, 10:00 PM MDT
In force: 5 hr
Issued by: the Storm Prediction Center

Counties Arthur County, NE, Blaine County, NE, Chase County, NE, Frontier County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 113 km from the middle of the area, began a volume at 22:48 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

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

Issued	Product	Office	Counties	Lasted
Jul 26, 4:52 PM MDT	Severe Thunderstorm Warning	LBF	McPherson	53 min
Jul 26, 5:13 PM MDT	Severe Thunderstorm Warning	LBF	Arthur	62 min
Jul 26, 5:35 PM MDT	Severe Thunderstorm Warning	LBF	Hooker	55 min
Jul 26, 5:46 PM MDT	Severe Thunderstorm Warning	LBF	McPherson	29 min
Jul 26, 6:12 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, McPherson	63 min
Jul 26, 6:31 PM MDT	Severe Thunderstorm Warning	LBF	Keith	59 min
Jul 26, 7:15 PM MDT	Severe Thunderstorm Warning	LBF	Thomas	45 min
Jul 26, 7:29 PM MDT	Severe Thunderstorm Warning	LBF	Blaine	61 min
Jul 26, 8:30 PM MDT	Severe Thunderstorm Warning	LBF	Blaine	60 min
Jul 26, 9:11 PM MDT	Severe Thunderstorm Warning	LBF	Frontier	49 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.8 hours before the alert went out and 49 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: 1879 J/kg
Mixed-layer CIN: -266 J/kg
Mixed-layer LCL: 1634 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 145 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

600 
WWUS9 KMKC 262225
SEL3  

SEL3  
MKC WW 262213
NEZ000-270400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 623
STORM PREDICTION CENTER NORMAN OK
513 PM CDT WED JUL 26 2000

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

   CENTRAL NEBRASKA                           

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 545 PM UNTIL
1100 PM 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 55 STATUTE MILES
EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF IMPERIAL
NEBRASKA TO 10 MILES EAST NORTHEAST OF MULLEN 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 622...

DISCUSSION...TSTMS ARE EXPECTED TO INTENSIFY OVER CNTRL NEB INVOF
OF E-W FRONTAL BNDRY. ALTHOUGH LARGE SCALE SUPPORT IS
LACKING...STRONG DEEP LAYER SHEAR WILL SUPPORT SUPERCELLS...WITH
LARGE HAIL AND DAMAGING WINDS BEING THE MAIN THREATS.


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 29020.

...VESCIO

420,0994 401,0995 401,1020 420,1015

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 10:00 PM MDT	Severe Thunderstorm Watch	SPC	Burt, Dakota, Dodge, Thurston, Washington	4 hr
Jul 26, 1:30 PM MDT	Tornado Watch	SPC	Adams, Boone, Buffalo, Burt, Butler, Cass and 34 more	6 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 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.