Alert archive / Utah / Flash Flood Warnings in 2005

Flash Flood Warning 2, NWS Salt Lake City, UT

February 11, 2005Kane County, San Juan County, Washington County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Feb 11, 2005, 3:00 PM MST for Kane County, San Juan County, Washington County, Utah. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Feb 11, 2005, 3:00 PM MST (22:00 UTC)
Expired
Feb 11, 2005, 11:00 PM MST
In force
8 hr
Issued by
NWS Salt Lake City, UT
Area
Counties, with a storm outline in the text

Counties Kane County, UT, San Juan County, UT, Washington County, UT

The radar

The Cedar City radar (KICX), 31 km from the middle of the area, began a volume at 22:02 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 10.0 hours before the alert went out and 250 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, Flgstf/Belemont, AZ at 12:00Z on 2005-02-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2005-02-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
536 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
220 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 KSLC 112200
FFWSLC
UTC025-037-053-120600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
300 PM MST FRI FEB 11 2005

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KANE COUNTY IN UTAH
  SOUTHWESTERN SAN JUAN COUNTY IN UTAH
  WASHINGTON COUNTY IN UTAH
  
* UNTIL 1100 PM MST

HEAVY RAINFALL IN THE SANTA CLARA AND VIRGIN RIVER DRAINAGES HAVE 
BROUGHT WATER LEVELS IN DRY WASHES...SMALL STREAMS AND SLOT CANYONS 
UP TO DANGEROUS LEVELS.  AS THE HEAVY RAINFALL SPREADS EASTWARD 
TODAY...SIMILAR RISES ARE EXPECTED ON RIVERS AND STREAMS IN KANE AND 
EXTREME WESTERN SAN JUAN COUNTIES.  

THESE SMALL TRIBUTARIES FEED LARGER STREAMS AND RIVERS IN THE 
WARNING AREA.  THE FORECAST CALLS FOR WIDESPREAD RIVER FLOODING ON 
MAINSTEM RIVERS BY SATURDAY MORNING THROUGH SATURDAY 
AFTERNOON...INCLUDING THE VIRGIN...THE SANTA CLARA AND THE PARIA.

THE FOLLOWING MAINSTEM RIVERS ARE EXPECTED TO FLOW AT THE FOLLOWING 
PEAK LEVELS.

SANTA CLARA NEAR ST. GEORGE...      1100 CFS    AT  2PM SATURDAY.
NORTH FORK VIRGIN RIVER...          1500 CFS    AT  7AM SATURDAY.
VIRGIN RIVER AT VIRGIN...           5300 CFS    AT  7AM SATURDAY.
VIRGIN RIVER NEAR HURRICANE...      6500 CFS    AT 11AM SATURDAY.
VIRGIN RIVER NEAR BLOOMINGTON...    9000 CFS    AT  4PM SATURDAY.
VIRGIN RIVER NEAR LITTLEFIELD...   10000 CFS    AT  8PM SATURDAY.

AS FLOODING ALONG THESE RIVERS IS EXPECTED LATE TONIGHT THROUGH 
SATURDAY...AND FLASH FLOODING OF SMALLER STREAMS IS EXPECTED TO 
CONTINUE THROUGH TONIGHT...THIS WARNING WILL LIKELY BE EXTENDED AND 
REISSUED AS A RIVER FLOOD WARNING. 

RIVER BANKS ARE VERY UNSTABLE AND RISES COULD CAUSE FAILURE OF THE 
BANKS IN SOME AREAS...ESPECIALLY ALONG THE SANTA CLARA RIVER. 
PERSONS IN THE WARNING AREA SHOULD AVOID GOING NEAR THESE WATERWAYS 
AS THE FLOWS WILL BE COLD...FAST AND DANGEROUS. 

LAT...LON 3706 11400 3704 11060 3751 11053 3742 11332 3753 11358 
3757 11400

$$

MCINERNEY/WILENSKY

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Feb 11, 11:00 AM MSTFlash Flood WarningSLCKane, San Juan, Washington6 hr

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.