Alert archive / Utah / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 23, NWS Grand Junction, CO
NWS Grand Junction, CO issued this severe thunderstorm warning at Aug 29, 2002, 1:32 PM MDT for Uintah County, Utah. It was in force for 43 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 29, 2002, 1:32 PM MDT (19:32 UTC)
- Expired
- Aug 29, 2002, 2:15 PM MDT
- In force
- 43 min
- Issued by
- NWS Grand Junction, CO
- Area
- Counties, with a storm outline in the text
County Uintah County, UT
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 29, 2:00 PM MDT | Hail 0.75 | Randlett, UT | |
| Aug 29, 2:25 PM MDT | Hail 0.88 | Randlett, UT |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 29, 1:05 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 7.5 hours before the alert went out and 141 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.
- 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
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Junction, CO wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 29, 2:30 AM MDT, 11 hours 2 minutes earlier.
Area forecast discussion, Aug 29, 2:30 AM MDT, 11 hours 2 minutes before
WESTERN COLORADO & EASTERN UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
230 AM MDT THU AUG 29 2002
LOW PRESSURE SYSTEM OVER THE WESTERN GREAT BASIN TO EJECT NORTH-
EASTWARD INTO THE NORTHERN PLAINS TODAY AND INTO TONIGHT. JET NOSING
INTO THE FOUR CORNERS ALREADY GENERATING SHOWERS AND THUNDERSTORMS
ACROSS SOUTHWESTERN CWFA. SO FAR...RAINFALL LIGHT BUT WINDS GUSTY AS
MID-LEVELS STILL RATHER DRY. DEWPOINT VALUES HAVE COME UP FROM
YESTERDAY OVER THE FOUR CORNERS...EXTENDING NORTH TO THE GRAND VALLEY
THIS MORNING. AS A RESULT...EXPECT NOT ALL THUNDERSTORMS TO BE DRY.
NONETHELESS...FIRE WEATHER STILL A MAJOR CONCERN WITH WATCH ALREADY
IN PLACE APPEARING WELL WARRANTED. WILL LET DAY SHIFT SETTLE DETAILS
OF POSSIBLE RED FLAG WARNING.
PRESENT FORECAST FOR TODAY APPEARS ON TRACK. MODELS CONTINUE TO SHOW
SHORTWAVE ENERGY AND JET INFLUENCE TO BE THE STORY TODAY. GIVEN
DEWPOINT FIELD ALLUDED TO ABOVE...WILL CONTINUE WITH BEST POPS OVER
THE SOUTHERN MOUNTAINS AND SCATTERED POPS ELSEWHERE. CLOUD COVER WILL
KEEP TEMPERATURES DOWN AND APPEARS MET DATA HAS GOOD HANDLE ON THE
SITUATION.
WAVE PUSHES EAST OF THE AREA TONIGHT...SO EXPECT SOME LINGERING
EVENING CONVECTION...THEN DRY AND CLEARING DURING THE REMAINDER OF
THE NIGHT TONIGHT. DRIER...SLIGHTLY MORE STABLE ENVIRONMENT IN PLACE
ON FRIDAY...THOUGH RESIDUAL MOISTURE AND INCREASED INSOLATION WILL
LIKELY YIELD SOME AFTERNOON/EVENING THUNDERSTORMS OVER THE HIGHER
TERRAIN. TEMPS SHOULD REBOUND WITH RETURN OF SUNSHINE AND MET
GUIDANCE AGAIN APPEARS TO HAVE GOOD HANDLE ON THE EVOLVING PATTERN.
LITTLE CHANGE INDICATED FOR SATURDAY. NL
EXTENDED (SUN-WED)...AVN HAS REMNANTS OF WESTERN TROF LIFTING
NORTHEAST ACROSS THE FORECAST AREA ON TUE...WHILE UPPER HIGH REMAINS
OVER NRN MEXICO/SRN NM THROUGH PERIOD. WILL CONTINUE WITH FORECAST OF
SWLY FLOW UNTIL THEN BASED ON AVN WITH SOME MID/HIGH LEVEL PACIFIC
MOISTURE ENTRAINED ACROSS THE AREA BEGINNING SUNDAY...AND THUS WILL
KEEP MENTION OF SLIGHT CHANCE FOR NOW ON SUN-MON ASSUMING ALSO SOME
WEAK EMBEDDED DISTURBANCES IN THE FLOW. THEN BETTER CHANCE FOR TUE AS
TROUGH LIFTS OUT. HOWEVER...ECWMF SHOWING MORE RIDGING OVER THE AREA
ON MONDAY WITH TROUGH NOW FARTHER WEST IMPLYING DRIER CONDITIONS...SO
WILL HAVE TO WATCH EVOLUTION. JAD
.GJT...FIRE WEATHER WATCH THURSDAY FROM 1100 THROUGH 2200 MDT
FOR ALL FIRE WX ZONES IN EASTERN UTAH AND WESTERN COLORADO.The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 29, 11:59 AM MDT | Flash Flood Warning | GJT | La Plata | 3 hr |
| Aug 29, 2:59 PM MDT | Flash Flood Warning | GJT | La Plata | 3 hr |
| Aug 29, 5:58 PM MDT | Severe Thunderstorm Warning | GJT | Mesa | 47 min |
| Aug 29, 2:11 PM MDT | Severe Thunderstorm Warning | GJT | Uintah | 49 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, 3:46 PM MDT | Severe Thunderstorm Warning | GJT | Grand | 44 min |
| Aug 29, 5:15 PM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
| Aug 29, 5:31 PM MDT | Severe Thunderstorm Warning | GJT | San Juan | 44 min |
Nearby
Severe Thunderstorm Warnings in Utah, 2002Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.