Alert archive / Utah / Flash Flood Watches in 2013

Flash Flood Watch 13, NWS Grand Junction, CO

September 18, 2013Grand County, Utah

NWS Grand Junction, CO issued this flash flood watch at Sep 18, 2013, 2:55 AM MDT for Grand County, Utah. It took effect at Sep 18, 2013, 12:00 PM MDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Sep 18, 2013, 2:55 AM MDT (08:55 UTC)
In effect from: Sep 18, 2013, 12:00 PM MDT
Expired: Sep 19, 2013, 3:28 AM MDT
In force: 15 hr
Issued by: NWS Grand Junction, CO
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 08:58 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

Salt Lake City I, UT (KSLC), launched 00:00Z, 8.9 hours before the alert went out and 282 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: 230 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 3419 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 149 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Sep 18, 2:47 AM MDT, 8 minutes earlier.

Area forecast discussion, Sep 18, 2:47 AM MDT, 8 minutes before

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Hazardous weather outlook, Sep 17, 9:27 AM MDT, 17 hours 28 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
927 AM MDT TUE SEP 17 2013

COZ001>014-017>023-UTZ022>025-027>029-181300-
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-
927 AM MDT TUE SEP 17 2013

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

.DAY ONE...TODAY AND TONIGHT

STRONG THUNDERSTORM WILL BE POSSIBLE THIS AFTERNOON AND EARLY
EVENING...ESPECIALLY ACROSS THE NORTHERN AREAS. STRONG GUSTY WINDS
TO 50 MPH WILL BE THE MAIN THREAT...BUT ISOLATED STORMS MAY
PRODUCE PEA TO MARBLE SIZED HAIL. ISOLATED SHOWERS AND
THUNDERSTORMS WILL CONTINUE THROUGH THE NIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A DRY COLD FRONT WILL MOVE THROUGH THE AREA WEDNESDAY AFTERNOON
AND EVENING BRINGING A SLIGHT CHANCE FOR SOME SHOWERS AND STORMS
MAINLY UP NORTH. ONCE IT PASSES...EXPECT CLEAR SKIES AS HIGH
PRESSURE BUILDS IN WITH COOL TEMPERATURES EXPECTED THURSDAY
BEFORE A WARM UP STARTS FOR THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS POSSIBLE TODAY. SPOTTERS ARE ENCOURAGED TO
REPORT EXCESSIVE WIND OR HAIL TO THE GRAND JUNCTION FORECAST
OFFICE.

In the hours before

Local storm report, Sep 17, 9:27 PM MDT, 5 hours 28 minutes before

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Special weather statement, Sep 17, 9:36 PM MDT, 5 hours 19 minutes before

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Local storm report, Sep 17, 10:03 PM MDT, 4 hours 52 minutes before

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Special weather statement, Sep 17, 10:56 PM MDT, 3 hours 59 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 17, 6:01 PM MDT	Severe Thunderstorm Warning	GJT	Dolores, Montezuma	59 min
Sep 17, 6:13 PM MDT	Areal Flood Advisory	GJT	Dolores, Montezuma	6 hr
Sep 17, 6:28 PM MDT	Severe Thunderstorm Warning	GJT	Moffat	47 min
Sep 17, 7:00 PM MDT	Severe Thunderstorm Warning	GJT	Dolores, Montezuma, San Miguel	60 min
Sep 17, 7:15 PM MDT	Severe Thunderstorm Warning	GJT	Moffat	45 min
Sep 18, 12:51 PM MDT	Special Weather Statement	GJT	Gunnison	39 min
Sep 18, 1:37 PM MDT	Areal Flood Advisory	GJT	San Miguel	3 hr
Sep 18, 1:49 PM MDT	Special Weather Statement	GJT	Montrose	26 min
Sep 18, 2:29 PM MDT	Special Weather Statement	GJT	Pitkin	46 min
Sep 18, 2:42 PM MDT	Special Weather Statement	GJT	Dolores	48 min
Sep 18, 2:44 PM MDT	Special Weather Statement	GJT	Delta	46 min
Sep 18, 2:49 PM MDT	Special Weather Statement	GJT	Delta	41 min
Sep 18, 3:06 PM MDT	Special Weather Statement	GJT	Garfield	24 min
Sep 18, 3:43 PM MDT	Special Weather Statement	GJT	Delta	47 min
Sep 18, 3:58 PM MDT	Freeze Watch	GJT	Moffat, Rio Blanco, Routt	23 hr
Sep 18, 5:12 PM MDT	Special Weather Statement	GJT	La Plata	48 min
Sep 18, 5:31 PM MDT	Areal Flood Advisory	GJT	La Plata	3 hr
Sep 18, 5:32 PM MDT	Severe Thunderstorm Warning	GJT	Archuleta, Hinsdale, La Plata	43 min
Sep 18, 5:53 PM MDT	Special Weather Statement	GJT	Hinsdale	82 min
Sep 17, 6:30 PM MDT	Severe Thunderstorm Warning	GJT	Uintah	45 min
Sep 17, 9:36 PM MDT	Special Weather Statement	GJT	Grand	39 min
Sep 17, 10:56 PM MDT	Special Weather Statement	GJT	Grand	49 min
Sep 18, 2:07 PM MDT	Severe Thunderstorm Warning	GJT	San Juan	38 min
Sep 18, 3:06 PM MDT	Areal Flood Advisory	GJT	San Juan	3 hr

Nearby

Flash Flood Watches in Utah, 2013 Every flash flood watch 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.