Alert archive / Utah / Flash Flood Warnings in 2009
Flash Flood Warning 1, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at May 25, 2009, 11:55 AM MDT for San Juan County, Utah. It was in force for 6 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
- May 25, 2009, 11:55 AM MDT (17:55 UTC)
- Expired
- May 25, 2009, 6:00 PM MDT
- In force
- 6 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 17:55 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, 5.9 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.
- Mixed-layer CAPE
- 75 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 1033 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 79 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 May 25, 11:45 AM MDT, 10 minutes earlier.
Area forecast discussion, May 25, 11:45 AM MDT, 10 minutes before
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</html>Hazardous weather outlook, May 25, 5:48 AM MDT, 6 hours 7 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 548 AM MDT MON MAY 25 2009 COZ001>014-017>023-UTZ022>025-027>029-261200- 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- 548 AM MDT MON MAY 25 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. ...FLASH FLOOD WATCH IN EFFECT FOR PORTIONS OF EAST CENTRAL UTAH AND WEST CENTRAL AND NORTHWEST COLORADO FROM NOON THROUGH THIS EVENING... .DAY ONE...REST OF TONIGHT... EXPECT SCATTERED SHOWERS AND THUNDERSTORMS OVER EASTERN UTAH AND WESTERN COLORADO VALLEYS WITH NUMEROUS SHOWERS AND THUNDERSTORMS OVER THE CENTRAL AND NORTHERN MOUNTAINS. STORMS WILL EB ABLE TO PRODUCE HEAVY RAINFALL IN A SHORT AMOUNT OF TIME OVER ALREADY SATURATED SOILS CAUSING POTENTIAL FOR FLASH FLOODING. RIVERS AND STREAMS ACROSS WESTERN COLORADO AND EASTERN UTAH WILL CONTINUE TO RUN HIGH FROM THE RECENT WARM TEMPERATURES...INCLUDING MANY SMALL CREEKS. CAUTION IS URGED WHEN WALKING OR RECREATING NEAR RIVERBANKS AND WATERWAYS. FOR MORE INFORMATION...PLEASE VISIT THE NATIONAL WEATHER SERVICE GRAND JUNCTION WEB SITE AT WEATHER.GOV/GJT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY... SCATTERED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS WILL CONTINUE EACH DAY...ESPECIALLY MOUNTAIN AREAS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS POSSIBLE TODAY FOR HEAVY RAIN AND MONITORING FLASH FLOODING.
The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 24, 6:33 PM MDT | Areal Flood Advisory | GJT | Delta, Montrose | 4 hr |
| May 24, 7:18 PM MDT | Areal Flood Advisory | GJT | Mesa | 3 hr |
| May 25, 3:58 AM MDT | Flash Flood Watch | GJT | Delta, Dolores, Garfield, Gunnison, Mesa, Moffat and 5 more | 16 hr |
| May 25, 11:05 AM MDT | River Flood Warning | GJT | Routt | 10 hr |
| May 25, 3:02 PM MDT | Areal Flood Advisory | GJT | San Juan | 4 hr |
Nearby
Flash Flood Warnings in Utah, 2009Every flash flood warning in 2009
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.