Alert archive / Utah / Flash Flood Warnings in 2005

Flash Flood Warning 21, NWS Grand Junction, CO

September 3, 2005San Juan County, Utah

NWS Grand Junction, CO issued this flash flood warning at Sep 3, 2005, 1:45 PM MDT for San Juan 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 counties it named.

The facts

Issued
Sep 3, 2005, 1:45 PM MDT (19:45 UTC)
Expired
Sep 3, 2005, 4:45 PM MDT
In force
3 hr
Issued by
NWS Grand Junction, CO
Area
Whole counties

County San Juan County, UT

The radar

The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 19:47 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.

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 7.8 hours before the alert went out and 202 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-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2005-09-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2005-09-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -5 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
5 J/kg
Mixed-layer CIN
-326 J/kg
Mixed-layer LCL
2496 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-5 m²/s²
0-3 km storm-relative helicity
-17 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 031948
FFWGJT
UTC037-032245-
/O.NEW.KGJT..W.0001.050903T1945Z-050903T2245Z/

BULLETIN -

NATIONAL WEATHER SERVICE GRAND JUNCTION CO
145 PM MDT SAT SEP 3 2005

THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A

* FOR...
  NORTH CENTRAL SAN JUAN COUNTY IN SOUTHEAST UTAH

* UNTIL 445 PM MDT.

* AT 143 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA.   
  DOPPLER RADAR ESTIMATED THAT OVER AN INCH OF RAIN HAS FALLEN IN 
  AREAS OF CANYONLANDS NATIONAL PARK WEST IN THE NORTHWEST CORNER OF
  SAN JUAN COUNTY

* SLOW MOVING THUNDERSTORMS ARE PRODUCING HEAVY RAINFALL IN THE
  WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
  FLOODING TO OCCUR IN SOME LOCATIONS...ESPECIALLY IN STEEP RAVINES
  AND GORGES.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE 
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME 
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR 
CREEKS.

$$

BA
2 follow-up statements
000
WGUS75 KGJT 032021
FFSGJT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
219 PM MDT SAT SEP 3 2005

UTC037-032245-
SAN JUAN UT-
219 PM MDT SAT SEP 3 2005

...FLASH FLOOD WARNING CONTINUES FOR SAN JUAN COUNTY UNTIL 4:45 PM 
MDT...

AT 217 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED 
AREA. DOPPLER RADAR ESTIMATED THAT OVER AN INCH OF RAIN HAS FALLEN 
THIS AFTERNOON ACROSS PORTIONS OF CANYONLANDS NATIONAL PARK.

SLOW MOVING THUNDERSTORMS ARE PRODUCING VERY HEAVY RAINFALL IN THE
WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH 
FLOODING TO OCCUR...ESPECIALLY IN STEEP CANYONS AND RAVINES. THE 
HEAVIEST RAIN SO FAR HAS FALLEN ACROSS THE WESTERN PORTIONS OF 
CANYONLANDS...NEAR THE COLORADO RIVER.

IT IS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...
OR CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.

$$

BA
000
WGUS75 KGJT 032246
FFSGJT

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
445 PM MDT SAT SEP 3 2005

UTC037-032315-
SAN JUAN UT-
445 PM MDT SAT SEP 3 2005

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SAN JUAN COUNTY HAS
BEEN ALLOWED TO EXPIRE...

THE POTENTIAL FOR EXCESSIVE RUNOFF FROM HEAVY RAINFALL HAS
SIGNIFICANTLY DECREASED. IF FLOODING WAS OBSERVED EARLIER IN THE 
AFTERNOON...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY
AND ASK THEM TO CONTACT THE NATIONAL WEATHER SERVICE OFFICE IN GRAND 
JUNCTION.

$$

Nearby

Flash Flood Warnings in Utah, 2005Every flash flood warning in 2005

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.