Alert archive / Utah / Flash Flood Warnings in 2013

Flash Flood Warning 56, NWS Grand Junction, CO

September 22, 2013Grand County, Utah

NWS Grand Junction, CO issued this flash flood warning at Sep 22, 2013, 4:48 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 counties it named.

The facts

Issued: Sep 22, 2013, 4:48 PM MDT (22:48 UTC)
Expired: Sep 22, 2013, 7:30 PM MDT
In force: 3 hr
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Flood severity: None

County Grand County, UT

The radar

The Grand Junction radar (KGJX), 118 km from the middle of the area, began a volume at 22:48 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, 10.8 hours before the alert went out and 94 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: 143 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1807 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 171 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

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 Sep 22, 2:45 PM MDT, 2 hours 3 minutes earlier.

Area forecast discussion, Sep 22, 2:45 PM MDT, 2 hours 3 minutes before

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Hazardous weather outlook, Sep 22, 6:45 AM MDT, 10 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
645 AM MDT SUN SEP 22 2013

COZ001>014-017>023-UTZ022>025-027>029-231300-
LOWER YAMPA RIVER BASIN-CENTRAL YAMPA RIVER BASIN-
ROAN AND TAVAPUTS PLATEAUS-ELKHEAD AND PARK MOUNTAINS-
UPPER YAMPA RIVER BASIN-GRAND VALLEY-DEBEQUE TO SILT CORRIDOR-
CENTRAL COLORADO RIVER BASIN-GRAND AND BATTLEMENT MESAS-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
WEST ELK AND SAWATCH MOUNTAINS-FLATTOPS-
UPPER GUNNISON RIVER VALLEY-UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-
NORTHWEST SAN JUAN MOUNTAINS-SOUTHWEST SAN JUAN MOUNTAINS-
PARADOX VALLEY/LOWER DOLORES RIVER-
FOUR CORNERS/UPPER DOLORES RIVER-ANIMAS RIVER BASIN-
SAN JUAN RIVER BASIN-SOUTHEAST UTAH-EASTERN UINTA MOUNTAINS-
EASTERN UINTA BASIN-TAVAPUTS PLATEAU-ARCHES/GRAND FLAT-
LA SAL AND ABAJO MOUNTAINS-CANYONLANDS/NATURAL BRIDGES-
645 AM MDT SUN SEP 22 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN
COLORADO.

.DAY ONE...TODAY AND TONIGHT

A POWERFUL WEATHER SYSTEM WILL MOVE ACROSS THE REGION TODAY AND
BRINGS STRONG THUNDERSTORMS...POSSIBLY SEVERE...THAT PRODUCE HAIL
AND STRONG WINDS.

HEAVY RAIN SHOWERS ARE EXPECTED AS WELL...ESPECIALLY ACROSS THE
SOUTH THAT BRINGS A THREAT OF FLASH FLOODING...MUD DEBRIS
FLOW...AND ROCKSLIDES IN STEEP TERRAIN.

LATE TONIGHT...LIGHT SNOW ACCUMULATIONS MAY RESULT IN SLUSHY
CONDITIONS OVER THE MOUNTAIN PASSES.

FOR SPECIFIC DETAILS OF HAZARDOUS WEATHER TODAY AND TONIGHT...SEE
THE FLASH FLOOD WATCH AND SPECIAL WEATHER STATEMENTS THAT PROVIDE
SPECIFIC DETAILS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THE NEXT CHANCE FOR PRECIPITATION WILL BE WEDNESDAY NIGHT THROUGH
FRIDAY AS ANOTHER COLD FRONT MOVES THROUGH. SNOW WILL BE POSSIBLE
OVER THE MOUNTAIN PASSES ACROSS WESTERN COLORADO.

ON FRIDAY AND SATURDAY MORNING...FREEZING TEMPERATURES MAY RESULT
IN SEASON ENDING KILLING FROST IN THE HIGHER VALLEYS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND EARLY
EVENING FOR MESA...DELTA...MONTROSE...OURAY...AND LA PLATA
COUNTIES.

In the hours before

Local storm report, Sep 22, 3:48 PM MDT, 1 hour before

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Local storm report, Sep 22, 3:49 PM MDT, 59 minutes before

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Local storm report, Sep 22, 3:53 PM MDT, 55 minutes before

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Local storm report, Sep 22, 4:26 PM MDT, 22 minutes before

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Local storm report, Sep 22, 4:36 PM MDT, 12 minutes before

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Local storm report, Sep 22, 4:41 PM MDT, 7 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 22, 11:08 AM MDT	Flash Flood Warning	GJT	Garfield	4 hr
Sep 22, 12:23 PM MDT	Flash Flood Warning	GJT	La Plata	6 hr
Sep 22, 12:30 PM MDT	Flash Flood Warning	GJT	San Miguel	3 hr
Sep 22, 12:38 PM MDT	Special Weather Statement	GJT		52 min
Sep 22, 12:50 PM MDT	Severe Thunderstorm Warning	GJT	Montrose, San Miguel	40 min
Sep 22, 1:16 PM MDT	Severe Thunderstorm Warning	GJT	La Plata, Montezuma	44 min
Sep 22, 1:20 PM MDT	Special Weather Statement	GJT	La Plata	40 min
Sep 22, 1:25 PM MDT	Severe Thunderstorm Warning	GJT	Delta, Mesa, Montrose	50 min
Sep 22, 1:43 PM MDT	Special Weather Statement	GJT	Rio Blanco	47 min
Sep 22, 1:49 PM MDT	Severe Thunderstorm Warning	GJT	La Plata	41 min
Sep 22, 2:18 PM MDT	Areal Flood Advisory	GJT	La Plata	3 hr
Sep 22, 2:26 PM MDT	Severe Thunderstorm Warning	GJT	La Plata	49 min
Sep 22, 2:40 PM MDT	Areal Flood Warning	GJT	Delta, Dolores, Mesa, Montezuma, Montrose, San Miguel	4 hr
Sep 22, 2:59 PM MDT	Severe Thunderstorm Warning	GJT	Archuleta, Hinsdale, La Plata	46 min
Sep 22, 3:08 PM MDT	Flash Flood Warning	GJT	La Plata, Montezuma	3 hr
Sep 22, 3:51 PM MDT	Areal Flood Advisory	GJT	Hinsdale	6 hr
Sep 22, 4:23 PM MDT	Areal Flood Advisory	GJT	Garfield, Mesa	3 hr
Sep 22, 4:40 PM MDT	Areal Flood Advisory	GJT	Delta, Mesa	4 hr
Sep 22, 5:08 PM MDT	Flash Flood Warning	GJT	La Plata	3 hr
Sep 22, 5:32 PM MDT	Areal Flood Advisory	GJT	Archuleta	3 hr
Sep 22, 9:22 AM MDT	Special Weather Statement	GJT	Grand	38 min
Sep 22, 10:30 AM MDT	Special Weather Statement	GJT	Uintah	45 min
Sep 22, 11:12 AM MDT	Special Weather Statement	GJT	Grand	48 min
Sep 22, 11:27 AM MDT	Special Weather Statement	GJT	San Juan	48 min
Sep 22, 11:43 AM MDT	Flash Flood Warning	GJT	San Juan	3 hr
Sep 22, 12:21 PM MDT	Severe Thunderstorm Warning	GJT	San Juan	39 min
Sep 22, 12:31 PM MDT	Severe Thunderstorm Warning	GJT	San Juan	44 min
Sep 22, 1:54 PM MDT	Special Weather Statement	GJT	Grand	51 min
Sep 22, 2:12 PM MDT	Areal Flood Advisory	GJT	Grand	3 hr

Nearby

Flash Flood Warnings in Utah, 2013 Every flash flood warning in 2013

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.