Alert archive / Utah / Flash Flood Warnings in 2001

Flash Flood Warning 2, NWS Grand Junction, CO

July 10, 2001Grand County, Utah

NWS Grand Junction, CO issued this flash flood warning at Jul 10, 2001, 7:14 PM MDT for Grand County, Utah. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jul 10, 2001, 7:14 PM MDT (01:14 UTC)
Expired: Jul 10, 2001, 10:15 PM MDT
In force: 3 hr
Issued by: NWS Grand Junction, CO
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Grand County, UT

The nearest sounding before it

Grand Junction, CO (KGJT), launched 00:00Z, 1.2 hours before the alert went out and 101 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: 483 J/kg
Mixed-layer CIN: -124 J/kg
Mixed-layer LCL: 2020 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 142 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 
WGUS55 KGJT 110115
FFWGJT

UTC019-110415-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
714 PM MDT TUE JUL 10 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  GRAND COUNTY IN EAST CENTRAL UTAH
  THIS INCLUDES THE CITIES OF...CASTLE VALLEY...MOAB

* UNTIL 1015 PM MDT

* AT 714 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED STRONG 
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN OVER MUCH OF SOUTHERN AND 
  CENTRAL GRAND COUNTY.

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...ROADS AND NORMALLY DRY WASHES AND ARROYOS.
IN ADDITION...THE HEAVY RAINS COULD ALSO TRIGGER ROCK AND MUDSLIDES 
IN THE HIGHER TERRAIN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. 

DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN 
DEPTH BY FOOT OR BY AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT 
IMMEDIATELY AND SEEK HIGHER GROUND.

LAT...LON 3853 10997 38n51 10907 3943 10908 3943 11001

DJN

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 10, 2:00 PM MDT, 5 hours 14 minutes earlier.

Area forecast discussion, Jul 10, 2:00 PM MDT, 5 hours 14 minutes before

WESTERN COLORADO & EASTERN UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
200 PM MDT TUE JUL 10 2001

MOIST TAP STILL IN PLACE WITH SHORT WAVE VISIBLE ON WATER VAPOR TO
AID IN AFTERNOON...EVENING ACTIVITY.  50+DEW POINTS AND OVER ONE INCH
PW COMBINE WITH ACTIVITY THE PAST FEW DAYS TO BRING SCT/NMRS
TSRA. STORMS WILL MOVE ABOUT 15 KTS. THE FOUR CORNERS AREA IS NOW IN
EXCESSS RAINFALL. COULD ALSO SEE ISOLATED HAIL POTENTIAL TO AN INCH
THIS AFTERNOON. SLIGHT BREAK IN MOISTURE POSSIBLE FOR THURSDAY BUT
NOT ENOUGH TO REMOVE COMPLETELY. CLOUDS TO HELP KEEP HIGH TEMPS NEAR
NORMAL OR SLIGHTLY BELOW NEXT COUPLE OF DAYS.  DJC

IN THE EXTENDED...MOISTURE PLUME THAT WILL BE OVER THE CWFA INTO
THURSDAY WILL BE SHUNTED WEST OF THE REGION FRIDAY/SATURDAY AS UPPER
RIDGE RETROGRADES TO THE FOUR CORNERS. LOOKS AS THOUGH MONSOONAL
MOISTURE WILL BE TRAPPED UNDER THE RIDGE FRIDAY AND SATURDAY...SO
HAVE ADDED LOW POPS TO SOME VALLEY ZONES AND BUMPED MOUNTAIN POPS.
ATMOSPHERE WILL DRY TOWARD LATTER HALF OF THE WEEKEND AS RIDGE
BECOMES FIRMLY ENTRENCHED OVER FOUR CORNERS. AFTER SLIGHT COOL
DOWN...TEMPERATURES WILL RETURN TO NORMAL FOR THE WEEKEND.  CNJ

.GJT...NONE.

In the hours before

Local storm report, Jul 10, 6:22 PM MDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION, CO
622 PM MDT TUE JUL 10 2001

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

0516 PM    5SW GRAND JUNCTION        CO   1.00 INCH HAIL
07/10/01   MESA                           REPORTED BY NWS TRAINED
                                          SPOTTER

0525 PM    6SW GRAND JUNCTION        CO   .75 INCH HAIL
07/10/01   MESA                           REPORTED BY NWS TRAINED
                                          SPOTTER

0525 PM    5S GRAND JUNCTION         CO   .88 INCH HAIL
07/10/01   MESA                           REPORTED BY NWS TRAINED
     X                                     SPOTTER

DJN

Nearby

Flash Flood Warnings in Utah, 2001 Every flash flood 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; the sounding from the Mesonet's radiosonde archive.