Alert archive / Nebraska / Tornado Watches in 2002

Tornado Watch 632

August 24, 2002Logan County, Phillips County, Sedgwick County, Colorado; 15 counties in Nebraska; Goshen County, Platte County, Wyoming

The Storm Prediction Center issued this tornado watch at Aug 24, 2002, 1:15 PM MDT for Logan County, Phillips County, Sedgwick County, Colorado; 15 counties in Nebraska; Goshen County, Platte County, Wyoming. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 24, 2002, 1:15 PM MDT (19:15 UTC)
Expired: Aug 24, 2002, 8:00 PM MDT
In force: 7 hr
Issued by: the Storm Prediction Center

Counties Logan County, CO, Phillips County, CO, Sedgwick County, CO, Arthur County, NE, Banner County, NE, Box Butte County, NE, Chase County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Hayes County, NE, Keith County, NE, Kimball County, NE, Morrill County, NE, Perkins County, NE, Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 164 km from the middle of the area, began a volume at 19:14 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

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

Issued	Product	Office	Counties	Lasted
Aug 24, 1:56 PM MDT	Tornado Warning	CYS	Box Butte, Dawes	49 min
Aug 24, 2:01 PM MDT	Severe Thunderstorm Warning	LBF	Garden	59 min
Aug 24, 2:12 PM MDT	Tornado Warning	LBF	Deuel, Garden	33 min
Aug 24, 2:45 PM MDT	Tornado Warning	LBF	Deuel	30 min
Aug 24, 3:08 PM MDT	Tornado Warning	BOU	Sedgwick	52 min
Aug 24, 3:16 PM MDT	Tornado Warning	LBF	Deuel	14 min
Aug 24, 3:41 PM MDT	Tornado Warning	LBF	Perkins	49 min
Aug 24, 4:09 PM MDT	Severe Thunderstorm Warning	LBF	Deuel	51 min
Aug 24, 4:25 PM MDT	Tornado Warning	CYS	Goshen	35 min
Aug 24, 4:28 PM MDT	Tornado Warning	LBF	Chase	62 min
Aug 24, 5:04 PM MDT	Tornado Warning	BOU	Logan, Weld	41 min
Aug 24, 5:22 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	38 min
Aug 24, 5:29 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	31 min
Aug 24, 5:40 PM MDT	Tornado Warning	BOU	Logan, Washington	50 min
Aug 24, 5:45 PM MDT	Tornado Warning	BOU	Logan	45 min
Aug 24, 5:51 PM MDT	Severe Thunderstorm Warning	CYS	Banner	39 min
Aug 24, 6:26 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	34 min
Aug 24, 6:32 PM MDT	Severe Thunderstorm Warning	BOU	Phillips	43 min
Aug 24, 6:43 PM MDT	Tornado Warning	CYS	Kimball	32 min
Aug 24, 7:13 PM MDT	Tornado Warning	CYS	Cheyenne	42 min
Aug 24, 7:19 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	26 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 7.3 hours before the alert went out and 226 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: 396 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 916 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 241915
SEL2  
SPC WW 241915
COZ000-NEZ000-WYZ000-250200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 632
STORM PREDICTION CENTER NORMAN OK
115 PM MDT SAT AUG 24 2002

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

   NORTHEAST COLORADO                           
   WESTERN NEBRASKA                           
   EAST CENTRAL AND SOUTHEAST WYOMING                            

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 115 PM UNTIL 800
PM MDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 55 MILES EAST NORTHEAST OF DOUGLAS WYOMING TO 25
MILES WEST SOUTHWEST OF IMPERIAL 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.


DISCUSSION...SUPERCELLS ARE EXPECTED TO CONTINUE DEVELOPING ALONG
LEE TROUGH AND OUTFLOW BOUNDARY OVER THE REGION.  VERY STEEP LAPSE
RATES WILL LIKELY SUPPORT MODERATE TO STRONG INSTABILITY LATER
TODAY WHERE HEATING IS MAXIMIZED.  ISOLATED VERY LARGE HAIL ALONG
WITH A TORNADO OR TWO CAN BE EXPECTED.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 28015.


...EVANS

430,1025 402,1003 402,1032 430,1055

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 23, 10:15 PM MDT	Severe Thunderstorm Watch	SPC	Bent, Cheyenne, Crowley, Kiowa, Lincoln, Otero and 1 more	6 hr
Aug 24, 5:20 PM MDT	Severe Thunderstorm Watch	SPC	Kit Carson, Morgan, Washington, Yuma	5 hr

Nearby

Tornado Watches in Nebraska, 2002 Tornado Watches in Colorado, 2002 Tornado Watches in Wyoming, 2002 Every tornado watch in 2002

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.