Alert archive / Utah / Flash Flood Warnings in 2021
Flash Flood Warning 53, NWS Grand Junction, CO
NWS Grand Junction, CO issued this flash flood warning at Jul 28, 2021, 7:23 PM MDT for Grand County, San Juan County, Utah. It was in force for 3 hr. 4 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 28, 2021, 7:23 PM MDT (01:23 UTC)
- Expired
- Jul 28, 2021, 10:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Grand Junction, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Grand County, UT, San Juan County, UT
The radar
The Grand Junction radar (KGJX), 133 km from the middle of the area, began a volume at 01:22 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 was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 28, 7:30 PM MDT | HEAVY RAIN 0.7 | Moab, UT | |
| Jul 28, 8:00 PM MDT | FLASH FLOOD | Moab, UT | NUMEROUS REPORTS OF FLASH FLOODING VIA SOCIAL MEDIA. |
| Jul 28, 8:53 PM MDT | HEAVY RAIN 0.79 | 4 Sse Moab, UT | |
| Jul 28, 9:00 PM MDT | HEAVY RAIN 1.62 | 4 Se Moab, UT |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 00:00Z, 1.4 hours before the alert went out and 115 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
- 405 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 3067 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
688
WGUS55 KGJT 290123
FFWGJT
UTC019-037-290430-
/O.NEW.KGJT.FF.W.0053.210729T0123Z-210729T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Grand Junction CO
723 PM MDT Wed Jul 28 2021
The National Weather Service in Grand Junction has issued a
* Flash Flood Warning for...
South Central Grand County in east central Utah...
Northern San Juan County in southeastern Utah...
* Until 1030 PM MDT.
* At 723 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.4 and 0.8 inches of
rain have fallen. Additional rainfall amounts of 0.5 to 1 inch are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Moab and Spanish Valley.
This includes the following streams and drainages...
Mill Creek, Hunters Canyon, Pack Creek, Dry Fork, North Fork Mill
Creek and Kane Springs Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3860 10978 3867 10968 3869 10955 3847 10935
3845 10939 3838 10949 3850 10972
FLASH FLOOD...RADAR INDICATED
$$
JDC2 follow-up statements
335
WGUS75 KGJT 290227
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
827 PM MDT Wed Jul 28 2021
UTC019-037-290430-
/O.CON.KGJT.FF.W.0053.000000T0000Z-210729T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grand UT-San Juan UT-
827 PM MDT Wed Jul 28 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT THIS
EVENING FOR SOUTH CENTRAL GRAND AND NORTHERN SAN JUAN COUNTIES...
At 827 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Between 1 and 2 inches of rain have
fallen. Additional rainfall amounts of 0.1 to 0.2 inches are
possible in the warned area. Flash flooding is ongoing in and around
Moab, UT.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Moab and Spanish Valley.
This includes the following streams and drainages...
Mill Creek, Hunters Canyon, Pack Creek, Dry Fork, Colorado River,
North Fork Mill Creek and Kane Springs Canyon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3860 10978 3867 10968 3869 10955 3847 10935
3845 10939 3838 10949 3850 10972
FLASH FLOOD...RADAR INDICATED
$$
JDC694
WGUS75 KGJT 290422
FFSGJT
Flash Flood Statement
National Weather Service Grand Junction CO
1022 PM MDT Wed Jul 28 2021
UTC019-037-290432-
/O.EXP.KGJT.FF.W.0053.000000T0000Z-210729T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grand UT-San Juan UT-
1022 PM MDT Wed Jul 28 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MDT THIS EVENING FOR
SOUTH CENTRAL GRAND AND NORTHERN SAN JUAN COUNTIES...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3860 10978 3867 10968 3869 10955 3847 10935
3845 10939 3838 10949 3850 10972
$$
JDCThe office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 6:32 PM MDT | Flash Flood Warning | GJT | San Juan | 75 min |
| Jul 28, 7:38 PM MDT | Areal Flood Warning | GJT | Grand | 5 min |
| Jul 28, 7:43 PM MDT | Flash Flood Warning | GJT | Grand | 3 hr |
| Jul 29, 5:39 PM MDT | Areal Flood Advisory | GJT | San Juan | 3 hr |
Nearby
Flash Flood Warnings in Utah, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.