Alert archive / Colorado / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 652

August 29, 20025 counties in Colorado; 5 counties in Utah; Carbon County, Sweetwater County, Wyoming

The Storm Prediction Center issued this severe thunderstorm watch at Aug 29, 2002, 1:05 PM MDT for 5 counties in Colorado; 5 counties in Utah; Carbon County, Sweetwater County, Wyoming. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Aug 29, 2002, 1:05 PM MDT (19:05 UTC)
Expired: Aug 29, 2002, 8:00 PM MDT
In force: 7 hr
Issued by: the Storm Prediction Center

Counties Garfield County, CO, Mesa County, CO, Moffat County, CO, Montrose County, CO, Rio Blanco County, CO, Daggett County, UT, Emery County, UT, Grand County, UT, Uintah County, UT, Wayne County, UT, Carbon County, WY, Sweetwater County, WY

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
Aug 29, 1:21 PM MDT	Severe Thunderstorm Warning	SLC	Emery, Wayne	54 min
Aug 29, 1:32 PM MDT	Severe Thunderstorm Warning	GJT	Uintah	43 min
Aug 29, 1:59 PM MDT	Severe Thunderstorm Warning	SLC	Emery	31 min
Aug 29, 2:11 PM MDT	Severe Thunderstorm Warning	GJT	Uintah	49 min
Aug 29, 2:27 PM MDT	Severe Thunderstorm Warning	SLC	Emery, Wayne	48 min
Aug 29, 2:56 PM MDT	Severe Thunderstorm Warning	GJT	Uintah	49 min
Aug 29, 3:02 PM MDT	Severe Thunderstorm Warning	GJT	Grand	43 min
Aug 29, 3:07 PM MDT	Severe Thunderstorm Warning	SLC	Emery, Sevier	38 min
Aug 29, 3:46 PM MDT	Severe Thunderstorm Warning	GJT	Grand	44 min
Aug 29, 5:58 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	47 min

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 7.1 hours before the alert went out and 97 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: 203 J/kg
Mixed-layer CIN: -177 J/kg
Mixed-layer LCL: 2205 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 82 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.

000
WWUS20 KWNS 291900
SEL2  
SPC WW 291905
COZ000-UTZ000-WYZ000-300200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 652
AFWA-OFFUTT AFB IN SPC BACKUP CAPACITY-OMAHA NEB
105 PM MDT THU AUG 29 2002

AFWA-OFFUTT AFB-OMAHA NEB AS THE SPC BACKUP HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WESTERN COLORADO                           
   EASTERN UTAH                               
   SOUTH CENTRAL WYOMING                            

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 105 PM UNTIL 800
PM MDT.

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 45 MILES SOUTH OF MOAB UTAH TO 45
MILES NORTHWEST OF RAWLINS WYOMING.

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.


DISCUSSION...SEVERE THUNDERSTORMS WITH PRIMARY THREAT OF LARGE HAIL
WILL CONTINUE DEVELOPING/SPREADING NEWD THROUGH THE AFTERNOON AHEAD
OF EJECTING SHORTWAVE TROUGH.


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 24025.


...AFWA/EVANS

380,1110 421,1091 421,1062 380,1082

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 28, 6:45 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Cheyenne, Kiowa, Kit Carson, Lincoln and 5 more	4 hr
Aug 29, 2:45 PM MDT	Severe Thunderstorm Watch	SPC	Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and 8 more	7 hr
Aug 29, 1:30 PM MDT	Severe Thunderstorm Watch	SPC	Big Horn, Fremont, Hot Springs, Natrona, Park, Washakie	7 hr
Aug 29, 3:40 PM MDT	Severe Thunderstorm Watch	SPC	Campbell, Crook, Weston	6 hr

Nearby

Severe Thunderstorm Watches in Colorado, 2002 Severe Thunderstorm Watches in Utah, 2002 Severe Thunderstorm Watches in Wyoming, 2002 Every severe thunderstorm 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.