Alert archive / Nebraska / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 596

July 19, 200033 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jul 19, 2000, 7:00 PM MDT for 33 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jul 19, 2000, 7:00 PM MDT (01:00 UTC)
Expired: Jul 20, 2000, 1:00 AM MDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 33 counties

Arthur County, NE, Blaine County, NE, Brown County, NE, Buffalo County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Franklin County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Grant County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Kearney County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Phelps County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE

The radar

The North Platte radar (KLNX), 22 km from the middle of the area, began a volume at 01:01 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

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

Issued	Product	Office	Counties	Lasted
Jul 19, 7:32 PM MDT	Severe Thunderstorm Warning	GLD	Dundy	58 min
Jul 19, 9:38 PM MDT	Severe Thunderstorm Warning	LBF	Rock	67 min
Jul 19, 9:50 PM MDT	Severe Thunderstorm Warning	GID	Furnas	40 min
Jul 19, 9:53 PM MDT	Severe Thunderstorm Warning	GID	Sherman	52 min
Jul 19, 10:14 PM MDT	Severe Thunderstorm Warning	LBF	Garfield, Holt	61 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 1.0 hours before the alert went out and 71 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: 1672 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1660 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 233 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.0

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 200039
MKC WW 200033
NEZ000-200700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 596
STORM PREDICTION CENTER NORMAN OK
733 PM CDT WED JUL 19 2000

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

   WESTERN AND CENTRAL NEBRASKA                           

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 800 PM
UNTIL 200 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 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 10 MILES NORTHEAST OF VALENTINE
NEBRASKA TO 20 MILES SOUTHEAST OF MCCOOK 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 594...WW 595...

DISCUSSION...THUNDERSTORMS DEVELOPING RAPIDLY ALONG DRY
LINE/SURFACE CONVERGENCE AXIS IN WESTERN NEBRASKA AND WILL
INTENSIFY AS THEY APPROACH AXIS OF 3000 J/KG CAPES. 50 TO 60 KT MID
LEVEL FLOW AND WET BULB ZERO HEIGHTS BELOW 9000 FT AGL INDICATE
SHEAR AND THERMODYNAMIC PROFILES WILL SUPPORT A FEW DAMAGING WIND
AND LARGE HAIL EVENTS. 

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 26040.

...ROGASH

;425,0985 395,0985 395,1014 425,1015;

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 3:00 PM MDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Kimball, Morrill, Scotts Bluff and 1 more	5 hr
Jul 20, 4:45 PM MDT	Tornado Watch	SPC	Chase, Dawson, Dundy, Frontier, Furnas, Gosper and 6 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.