Alert archive / Colorado / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 8, NWS Grand Junction, CO

July 14, 2001Delta County, Colorado

NWS Grand Junction, CO issued this severe thunderstorm warning at Jul 14, 2001, 4:05 PM MDT for Delta County, Colorado. It was in force for 40 min. 1 report 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: Jul 14, 2001, 4:05 PM MDT (22:05 UTC)
Expired: Jul 14, 2001, 4:45 PM MDT
In force: 40 min
Issued by: NWS Grand Junction, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Delta County, CO

What was reported inside it

Time	Report	Where	Remark
Jul 14, 4:30 PM MDT	Thunderstorm Wind 52 E	Cedaredge, CO

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 nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 10.1 hours before the alert went out and 405 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: 328 J/kg
Mixed-layer CIN: -290 J/kg
Mixed-layer LCL: 2484 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 253 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 Jul 14, 2:00 PM MDT, 2 hours 5 minutes earlier.

Area forecast discussion, Jul 14, 2:00 PM MDT, 2 hours 5 minutes before

WESTERN COLORADO & EASTERN UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
200 PM MDT SAT JUL 14 2001

CLOUD COVER REDUCED TEMP AND CONVECTION SO FAR TODAY. ISOLATED TSRA
FINALLY BREAKING OUT WITH KANE GULCH RAWS SW OF BLANDING RECEIVING
1.1 INCH IN AN HOUR. THIS WAVE OF WX MOVG NE ACROSS UTAH. BEST
CURRENT ACTIVITY MOVING TOWARDS WEST CENTRAL CO. THIS AREA MAY
HAVE MORE HEAVY RAIN PROBLEMS THAN OUR NORTHERN ZONES WHERE HPC HAS
PLACED OUR NW CWA IN EXCESSIVE RAIN AREA. WILL ADD HEAVY PRECIP
POSSIBLE BOTH AREAS...BUT HOLD OFF ON ANY ADVISORIES FOR NOW.

MODELS HINTING AT BRIEF RELIEF FROM CLDS/WX SUNDAY MORNING INTO MID
AFTERNOON. THIS BREAK MAY BE REASONABLE AFTER THE WORKING OVER THE
ATMOSPHERE IS GETTING TODAY.

MONSOONAL FLOW LOOKS A BIT DISCONNECTED PER SAT IMAGERY...BUT BEST
READ ON GUIDANCE KEEPS THE FETCH OVER EASTERN UTAH/ARIZONA AND THE
WEST SLOPE INTO THE FIRST OF NEXT WEEK. IF THE FLOW DOES REMAIN
SPOTTY WILL SEE LESS CLOUDS...FEW STORMS...BUT THE ONE THAT
DEVELOP WILL HAVE GREATER POTENTIAL TO REACH STRONG OR SEVERE
LEVELS. DJC/21

EXTENDED: THE REGION REMAINS IN THE INTERACTION ZONE BETWEEN
WEST-COAST TROF AND SOUTH-PLAINS HIGH. MRF IS STILL TRYING
TO WORK THE TROF INLAND. THAT THE TROF IS ALONG THE WEST-COAST IS
CLIMATOLOGICALLY UNUSUAL...AND IT COMING INLAND EVEN MORE SO.
DRYING IS LIKELY IN STRENGTHENED SW FLOW...BUT POSSIBLY ONLY IN THE
MID-LEVELSh.  THIS WOULD LESSEN THE CHANCE OF HEAVY RAINS BUT
INCREASE STORM STRENGTH. SO THUNDERSTORM CHANCES CONTINUE.
TEMPERATURES WILL BE AT OR BELOW NORMAL WITH AFTERNOON BREEZES.
RAMEY

.GJT...NONE.

In the hours before

Local storm report, Jul 14, 2:38 PM MDT, 1 hour 27 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION, CO
238 PM MDT SAT JUL 14 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION..A..

0231 PM    2 W PLEASANT VIEW         CO   .75 INCH HAIL
07/14/01   MONTEZUMA                      REPORTED BY CO-OP
                                          OBSERVERS

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 14, 2:17 PM MDT	Severe Thunderstorm Warning	GJT	Dolores, Montezuma	43 min
Jul 14, 3:43 PM MDT	Severe Thunderstorm Warning	GJT	Mesa	47 min

Nearby

Severe Thunderstorm Warnings in Colorado, 2001 Every severe thunderstorm warning in 2001

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.