Alert archive / Utah / Flash Flood Warnings in 2010

Flash Flood Warning 2, NWS Grand Junction, CO

July 21, 2010San Juan County, Utah

NWS Grand Junction, CO issued this flash flood warning at Jul 21, 2010, 2:02 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
Jul 21, 2010, 2:02 PM MDT (20:02 UTC)
Expired
Jul 21, 2010, 5:00 PM MDT
In force
3 hr
Issued by
NWS Grand Junction, CO
Area
Storm-based polygon
Flood severity
None

County San Juan County, UT

The radar

The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 20:02 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.

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 21, 3:19 AM MDT, 10 hours 43 minutes earlier.

Area forecast discussion, Jul 21, 3:19 AM MDT, 10 hours 43 minutes before
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Hazardous weather outlook, Jul 21, 6:00 AM MDT, 8 hours 2 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
600 AM MDT WED JUL 21 2010

COZ001>014-017>023-UTZ022>025-027>029-221138-
ANIMAS RIVER BASIN-ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES-
CENTRAL COLORADO RIVER BASIN-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR-
EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS-
ELKHEAD AND PARK MOUNTAINS-FLAT TOPS-
FOUR CORNERS/UPPER DOLORES RIVER-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS-
GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN-
NORTHWEST SAN JUAN MOUNTAINS-PARADOX VALLEY/LOWER DOLORES RIVER-
ROAN AND TAVAPUTS PLATEAUS-SAN JUAN RIVER BASIN-SOUTHEAST UTAH-
SOUTHWEST SAN JUAN MOUNTAINS-TAVAPUTS PLATEAU-
UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-UPPER GUNNISON RIVER VALLEY-
UPPER YAMPA RIVER BASIN-WEST ELK AND SAWATCH MOUNTAINS-
600 AM MDT WED JUL 21 2010

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

.DAY ONE...TODAY AND TONIGHT
THUNDERSTORMS AND SHOWERS ARE EXPECTED AGAIN TODAY AS DISTURBANCES
CONTINUE TO MOVE OVER UTAH AND COLORADO.  MAIN CONCERN WILL BE
GUSTY WINDS AT THE SURFACE.  ALL AREAS IN UTAH AND COLORADO HAVE A
CHANCE TO SEE SOME PRECIPITATION TODAY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY
MOISTURE WILL INCREASE OVER THE AREA WITH A SLIGHT CHANCE OF
THUNDERSTORMS OVER LOWER ELEVATIONS AND A CHANCE OF
THUNDERSTORMS OVER THE MOUNTAINS THURSDAY THROUGH THE WEEKEND THOUGH
AREAS SOUTH OF INTERSTATE 70 WILL BE FAVORED.

.SPOTTER INFORMATION STATEMENT

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.

In the hours before

Special weather statement, Jul 21, 1:30 PM MDT, 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
130 PM MDT WED JUL 21 2010

UTZ023-024-212015-
EASTERN UINTA BASIN UT-EASTERN UINTA MOUNTAINS UT-
130 PM MDT WED JUL 21 2010

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN UINTAH COUNTY UNTIL
215 PM MDT...

AT 125 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 10 MILES SOUTHWEST OF WHITEROCKS...MOVING EAST AT
30 MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM...ALONG
WITH HEAVY RAIN AND FREQUENT LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  WHITEROCKS...
  MAESER...
  VERNAL...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING. WHEN THUNDER ROARS...GO INDOORS.

HEAVY RAINFALL...WHICH MAY RESULT IN MINOR FLOODING...IS ALSO
LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY.

PRINGLE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 9:29 AM MDTFlash Flood WatchGJTArchuleta, Delta, Dolores, Gunnison, Hinsdale, La Plata and 6 more12 hr
Jul 21, 2:58 PM MDTSevere Thunderstorm WarningGJTMoffat47 min
Jul 21, 5:08 PM MDTFlash Flood WarningGJTDolores, Montrose, San Juan, San Miguel3 hr
Jul 21, 2:12 PM MDTSevere Thunderstorm WarningGJTUintah48 min
Jul 21, 2:47 PM MDTSevere Thunderstorm WarningGJTSan Juan43 min
Jul 21, 3:32 PM MDTSevere Thunderstorm WarningGJTSan Juan26 min

Nearby

Flash Flood Warnings in Utah, 2010Every flash flood warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.