Alert archive / Utah / Flash Flood Warnings in 2013
Flash Flood Warning 21, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Aug 26, 2013, 4:47 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 outline as issued.
The facts
- Issued
- Aug 26, 2013, 4:47 PM MDT (22:47 UTC)
- Expired
- Aug 26, 2013, 7:30 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), 226 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 222 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
- 80 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 731 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
406 WGUS55 KGJT 262247 FFWGJT UTC037-270130- /O.NEW.KGJT.FF.W.0021.130826T2247Z-130827T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE GRAND JUNCTION CO 447 PM MDT MON AUG 26 2013 THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTH CENTRAL SAN JUAN COUNTY IN SOUTHEAST UTAH... * UNTIL 730 PM MDT * AT 444 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SLOW MOVING THUNDERSTORM 8 MILES SOUTH OF BLUFF WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. RAINFALL RATES OF ONE INCH PER HOUR ARE EXPECTED. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BLUFF. THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...CROSS CANYON...ALKALI CREEK...MONTEZUMA CREEK...NAVAJO CANYON...MC ELMO CREEK...SAHGZIE CREEK...DESERT CREEK...LONE MOUNTAIN CREEK AND EAST MC ELMO CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...AND HIGHWAYS. ADDITIONALLY...COUNTRY ROADS AND ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3746 10934 3705 10943 3705 10965 3745 10972 $$ JD
2 follow-up statements
234 WGUS75 KGJT 262350 FFSGJT FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 550 PM MDT MON AUG 26 2013 UTC037-270130- /O.CON.KGJT.FF.W.0021.000000T0000Z-130827T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN JUAN UT- 550 PM MDT MON AUG 26 2013 ...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL SAN JUAN COUNTY UNTIL 730 PM MDT... AT 547 PM MDT...DOPPLER RADAR INDICATED THAT THE HEAVY RAIN HAD ENDED ACROSS THE WARNED AREA. A LOCAL SPOTTER REPORTED THAT THE HEAVIEST RAINFALL OCCURRED EAST OF BLUFF. WHILE THE HEAVY RAIN HAS ENDED...WATER MAY STILL BE FLOWING IN STREAMS AND NORMALLY DRY WASHES DUE TO EXCESSIVE RUNOFF. THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...CROSS CANYON...ALKALI CREEK...MONTEZUMA CREEK...NAVAJO CANYON...MC ELMO CREEK...SAHGZIE CREEK...DESERT CREEK...LONE MOUNTAIN CREEK AND EAST MC ELMO CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. && LAT...LON 3746 10934 3705 10943 3705 10965 3745 10972 $$ JD
267 WGUS75 KGJT 270039 FFSGJT FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 639 PM MDT MON AUG 26 2013 UTC037-270053- /O.CAN.KGJT.FF.W.0021.000000T0000Z-130827T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN JUAN UT- 639 PM MDT MON AUG 26 2013 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTH CENTRAL SAN JUAN COUNTY IS CANCELLED... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. THUNDERSTORMS WILL REMAIN A THREAT THROUGH THIS EVENING ACROSS SOUTHERN SAN JUAN COUNTY. IF FLOODING IS OBSERVED...PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. LAT...LON 3746 10934 3705 10943 3705 10965 3745 10972 $$ JD
The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 10:58 AM MDT | River Flood Advisory | GJT | San Juan | 22 hr |
| Aug 26, 5:18 PM MDT | Flash Flood Warning | GJT | San Juan | 3 hr |
Nearby
Flash Flood Warnings in Utah, 2013Every 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.