Alert archive / Utah / Red Flag Warnings in 2021
Red Flag Warning 22, NWS Grand Junction, CO
NWS Grand Junction, CO issued this red flag warning at May 20, 2021, 3:21 AM MDT for Grand County, San Juan County, Utah. It took effect at May 21, 2021, 11:00 AM MDT. 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
- May 20, 2021, 3:21 AM MDT (09:21 UTC)
- In effect from
- May 21, 2021, 11:00 AM MDT
- Expired
- May 21, 2021, 1:49 PM MDT
- In force
- 3 hr
- Issued by
- NWS Grand Junction, CO
Counties Grand County, UT, San Juan County, UT
The radar
The Grand Junction radar (KGJX), 153 km from the middle of the area, began a volume at 09:25 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 00:00Z, 9.4 hours before the alert went out and 138 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
- 151 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 3503 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 102 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
973 WWUS85 KGJT 200921 RFWGJT URGENT - FIRE WEATHER MESSAGE National Weather Service Grand Junction CO 321 AM MDT Thu May 20 2021 UTZ490-210000- /O.UPG.KGJT.FW.A.0019.210521T1700Z-210522T0300Z/ /O.NEW.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ /O.CON.KGJT.FW.W.0021.210520T1700Z-210521T0500Z/ Colorado River Basin- 321 AM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... The National Weather Service in Grand Junction has issued a Red Flag Warning for gusty winds, low relative humidity and dry fuels, which is in effect from 11 AM to 9 PM MDT Friday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Utah, Fire Weather Zone 490 Colorado River Basin. * WINDS...South 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...7 to 12 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ UTZ491-210000- /O.UPG.KGJT.FW.A.0019.210521T1700Z-210522T0300Z/ /O.NEW.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ /O.CON.KGJT.FW.W.0021.210520T1700Z-210521T0500Z/ Southeast Utah- 321 AM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... The National Weather Service in Grand Junction has issued a Red Flag Warning below 7000 feet for gusty winds, low relative humidity and dry fuels, which is in effect from 11 AM to 9 PM MDT Friday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...In Utah, Fire Weather Zone 491 Southeast Utah below 7000 feet. * WINDS...South 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...7 to 12 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ UTZ486-210000- /O.EXA.KGJT.FW.W.0021.210520T1700Z-210521T0500Z/ Eastern Uinta Basin- 321 AM MDT Thu May 20 2021 ...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 486... The National Weather Service in Grand Junction has issued a Red Flag Warning for gusty winds, low relative humidity and dry fuels, which is in effect from 11 AM this morning to 11 PM MDT this evening. * AFFECTED AREA...In Utah, Fire Weather Zone 486 Eastern Uinta Basin. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...9 to 14 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ COZ200-202-207-290-292-210000- /O.CON.KGJT.FW.W.0021.210520T1700Z-210521T0500Z/ Little Snake Forecast Area-White River Forecast Area- Southwest Colorado Lower Forecast Area- Paradox Valley Forecast Area-North Fork Forecast Area- 321 AM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONES 200, 202, 207, 290, AND 292... * AFFECTED AREA...In Colorado, Fire Weather Zone 200 Little Snake Forecast Area, Fire Weather Zone 202 White River Forecast Area, Fire Weather Zone 207 Southwest Colorado Lower Forecast Area, Fire Weather Zone 290 Paradox Valley Forecast Area and Fire Weather Zone 292 North Fork Forecast Area. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...9 to 14 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ COZ294-210000- /O.CON.KGJT.FW.W.0021.210520T1700Z-210521T0500Z/ Southwest Colorado Upper West Forecast Area- 321 AM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 294 BELOW 9000 FEET... * AFFECTED AREA...In Colorado, Fire Weather Zone 294 Southwest Colorado Upper West Forecast Area below 9000 feet. * WINDS...South 20 to 30 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ COZ295-210000- /O.CON.KGJT.FW.W.0021.210520T1700Z-210521T0500Z/ Southwest Colorado Upper East Forecast Area- 321 AM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 295 BELOW 9500 FEET... * AFFECTED AREA...In Colorado, Fire Weather Zone 295 Southwest Colorado Upper East Forecast Area below 9500 feet. * WINDS...Southwest 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
5 follow-up statements
979 WWUS85 KGJT 202108 RFWGJT URGENT - FIRE WEATHER MESSAGE National Weather Service Grand Junction CO 308 PM MDT Thu May 20 2021 UTZ490-210700- /O.CON.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ /O.CON.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ Colorado River Basin- 308 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... * AFFECTED AREA...In Utah, Fire Weather Zone 490 Colorado River Basin. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...7 to 12 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ UTZ491-210700- /O.CON.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ /O.CON.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ Southeast Utah- 308 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... * AFFECTED AREA...In Utah, Fire Weather Zone 491 Southeast Utah below 7000 feet. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...8 to 13 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ COZ200-202-207-290-292-210500- /O.CON.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Little Snake Forecast Area-White River Forecast Area- Southwest Colorado Lower Forecast Area- Paradox Valley Forecast Area-North Fork Forecast Area- 308 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONES 200, 202, 207, 290, AND 292... * AFFECTED AREA...In Colorado, Fire Weather Zone 200 Little Snake Forecast Area, Fire Weather Zone 202 White River Forecast Area, Fire Weather Zone 207 Southwest Colorado Lower Forecast Area, Fire Weather Zone 290 Paradox Valley Forecast Area and Fire Weather Zone 292 North Fork Forecast Area. * WINDS...Southwest 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...9 to 14 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ UTZ486-210500- /O.CON.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Eastern Uinta Basin- 308 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 486... * AFFECTED AREA...In Utah, Fire Weather Zone 486 Eastern Uinta Basin. * WINDS...Southwest 20 to 30 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...8 to 13 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ COZ294-210500- /O.CON.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Southwest Colorado Upper West Forecast Area- 308 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 294 BELOW 9000 FEET... * AFFECTED AREA...In Colorado, Fire Weather Zone 294 Southwest Colorado Upper West Forecast Area below 9000 feet. * WINDS...Southwest 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ COZ295-210500- /O.CON.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Southwest Colorado Upper East Forecast Area- 308 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 295 BELOW 9500 FEET... * AFFECTED AREA...In Colorado, Fire Weather Zone 295 Southwest Colorado Upper East Forecast Area below 9500 feet. * WINDS...Southwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
481 WWUS85 KGJT 210458 RFWGJT URGENT - FIRE WEATHER MESSAGE National Weather Service Grand Junction CO 1058 PM MDT Thu May 20 2021 UTZ490-220000- /O.EXP.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ /O.CON.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ Colorado River Basin- 1058 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... * AFFECTED AREA...In Utah, Fire Weather Zone 490 Colorado River Basin. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...7 to 12 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ UTZ491-220000- /O.EXP.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ /O.CON.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ Southeast Utah- 1058 PM MDT Thu May 20 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... * AFFECTED AREA...In Utah, Fire Weather Zone 491 Southeast Utah below 7000 feet. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...8 to 13 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ COZ200-202-207-290-292-210600- /O.EXP.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Little Snake Forecast Area-White River Forecast Area- Southwest Colorado Lower Forecast Area- Paradox Valley Forecast Area-North Fork Forecast Area- 1058 PM MDT Thu May 20 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONES 200, 202, 207, 290, AND 292... Humidities have recovered and though some gusty winds continue, critical fire weather conditions are no longer being met. The current Red Flag Warning will be allowed to expire. $$ UTZ486-210600- /O.EXP.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Eastern Uinta Basin- 1058 PM MDT Thu May 20 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 486... Humidities have recovered and though some gusty winds continue, critical fire weather conditions are no longer being met. The current Red Flag Warning will be allowed to expire. $$ COZ294-210600- /O.EXP.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Southwest Colorado Upper West Forecast Area- 1058 PM MDT Thu May 20 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 294 BELOW 9000 FEET... Humidities have recovered and though some gusty winds continue, critical fire weather conditions are no longer being met. The current Red Flag Warning will be allowed to expire. $$ COZ295-210600- /O.EXP.KGJT.FW.W.0021.000000T0000Z-210521T0500Z/ Southwest Colorado Upper East Forecast Area- 1058 PM MDT Thu May 20 2021 ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 295 BELOW 9500 FEET... Humidities have recovered and though some gusty winds continue, critical fire weather conditions are no longer being met. The current Red Flag Warning will be allowed to expire. $$
775 WWUS85 KGJT 211053 RFWGJT URGENT - FIRE WEATHER MESSAGE National Weather Service Grand Junction CO 453 AM MDT Fri May 21 2021 UTZ490-211900- /O.CON.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ Colorado River Basin- 453 AM MDT Fri May 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 9 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... * AFFECTED AREA...In Utah, Fire Weather Zone 490 Colorado River Basin. * WINDS...South 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ UTZ491-211900- /O.CON.KGJT.FW.W.0022.210521T1700Z-210522T0300Z/ Southeast Utah- 453 AM MDT Fri May 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 9 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... * AFFECTED AREA...In Utah, Fire Weather Zone 491 Southeast Utah below 7000 feet. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
959 WWUS85 KGJT 211852 RFWGJT URGENT - FIRE WEATHER MESSAGE National Weather Service Grand Junction CO 1252 PM MDT Fri May 21 2021 UTZ490-220300- /O.CON.KGJT.FW.W.0022.000000T0000Z-210522T0300Z/ Colorado River Basin- 1252 PM MDT Fri May 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 490... * AFFECTED AREA...In Utah, Fire Weather Zone 490 Colorado River Basin. * WINDS...South 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$ UTZ491-220300- /O.CON.KGJT.FW.W.0022.000000T0000Z-210522T0300Z/ Southeast Utah- 1252 PM MDT Fri May 21 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONE 491 BELOW 7000 FEET... * AFFECTED AREA...In Utah, Fire Weather Zone 491 Southeast Utah below 7000 feet. * WINDS...South 25 to 35 mph with gusts up to 50 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions will be favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of strong winds, low relative humidity, and warm temperatures can contribute to extreme fire behavior. && $$
467 WWUS85 KGJT 211949 RFWGJT URGENT - FIRE WEATHER MESSAGE National Weather Service Grand Junction CO 149 PM MDT Fri May 21 2021 UTZ490-491-220400- /O.CAN.KGJT.FW.W.0022.000000T0000Z-210522T0300Z/ /O.NEW.KGJT.FW.A.0020.210522T1800Z-210523T0300Z/ Colorado River Basin-Southeast Utah- 149 PM MDT Fri May 21 2021 ...FIRE WEATHER WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH SATURDAY EVENING FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONES 490 AND 491... ...RED FLAG WARNING IS CANCELLED FOR GUSTY WINDS, LOW RELATIVE HUMIDITY AND DRY FUELS FOR FIRE WEATHER ZONES 490 AND 491... The National Weather Service in Grand Junction has issued a Fire Weather Watch for gusty winds, low relative humidity and dry fuels, which is in effect from Saturday afternoon through Saturday evening. The Red Flag Warning has been cancelled. * AFFECTED AREA...In Utah, Fire Weather Zone 490 Colorado River Basin and Fire Weather Zone 491 Southeast Utah. * WINDS...South 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...10 to 15 percent. * IMPACTS...Conditions may become favorable for easy ignition and rapid spread of fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$
What forecasters said that day
The local office's own words before this red flag 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 red flag warning went out at May 19, 11:29 PM MDT, 3 hours 52 minutes earlier.
Area forecast discussion, May 19, 11:29 PM MDT, 3 hours 52 minutes before
Area Forecast Discussion
National Weather Service Grand Junction CO
1129 PM MDT Wed May 19 2021
.SHORT TERM...(Tonight through Thursday night)
Issued at 346 PM MDT Wed May 19 2021
Showers and storms fired over the western Colorado high terrain
this afternoon as expected with storms quickly moving off the
terrain into adjacent valleys in a north-northwest flow. Nothing
too concerning as storms moved fairly quickly and exhibited more
of a pop and drop variety, producing more wind than rain due to
dry low levels. Storms are now beginning to enter into northeast
Utah as a shortwave tracks across northern Utah. Once again, these
storms are exhibiting the pop and drop nature. Anticipating more
wind than rain but some storms could produce small hail. These
storms look to track into northwest and west-central Colorado this
evening according to the latest hi res guidance and should
dissipate shortly after sunset as we lose daytime heating.
The strong upper low will deepen over the Pacific Northwest into
the northern Great Basin Thursday, allowing the pressure gradient
to tighten. An 80 kt upper level jet will move into central Utah
out ahead of the main upper level jet rounding the base of the
trough. This will advect drier and warmer air into the region,
resulting in deep mixing across much of eastern Utah and western
Colorado. Good chance that high temperatures on Thursday exceed
normals by about 10 degrees with some of the desert valleys of
southeast Utah and west-central Colorado nearing the 90 degree
mark! H7 winds will increase 30 to 40 kts with H5 winds upwards
of 50 kts. Decided to first upgrade the Fire Weather Watch to a
Red Flag Warning for all zones in eastern Utah and western
Colorado where fuels remain critical (that includes lower
elevations of eastern Utah, northwest Colorado and southwest
Colorado at this time). Secondly, since wind gusts will be
approaching 50 mph in these areas, also issued a Wind Advisory for
Thursday, starting late Thursday morning through Thursday
evening. A 100 kt jet streak will move into eastern Utah Thursday
night, pulling deeper moisture into western Colorado after
midnight Thursday night towards Friday morning, with specific
humidity values climbing into the 5 to 6 g/kg range. This will
result in an increase in cloud cover and precipitation, mainly
across western Colorado, while eastern Utah will remain on the
fringe of this moisture advection. More details on this in the
Long Term section below.
.LONG TERM...(Friday through Wednesday)
Issued at 346 PM MDT Wed May 19 2021
The main focus during this period will be on the dry and windy
weather and related fire weather concerns Friday through Sunday for
eastern UT and portions of far western CO, and the likelihood for
decent rain/snow for the central and southern mountains on Friday.
A deep upper level trough will be over the Great Basin with little
opportunity to move thanks to a large blocking downstream ridge
through Saturday. A tight height gradient over our region between
the two major features will result in strong southerly winds aloft
and afternoon gusty winds at the surface. A plume of higher than
normal precipitable water will also be focused over mainly western
CO Friday. While most areas will have a chance of rain, the San
Juans being orthogonal to the southerly flow will benefit the most
from orographic lift with one half to one inch of liquid equivalent
likely Friday. Elsewhere...precipitation amounts will be
considerably lighter...with the lower valleys likely not getting
more than a trace. Snow levels will be high and any accumulating
snow should remain above 11kft. Due to the tight gradient and
strong winds aloft potentially mixing to the surface across
eastern Utah and far northwest Colorado, went ahead and issued a
Wind Advisory for these zones with potential wind gusts up to 50
mph, with gusts to 60 mph over the La Sals. Confidence in stronger
winds meeting wind advisory criteria over the western Colorado
zones is lower due to increased clouds, showers and moisture. It
all depends on where the edge of this moisture resides, so the far
western Colorado zones could see potential for stronger winds.
Will hold off on these areas and let later shifts re-evaluate as
details paint a clearer picture with the next few model runs.
On Saturday, the upper level gradient remains the same, but the
higher moisture content in the southerly plume is expected to shift
eastward, so precipitation coverage will be less. Ensemble models
show the upper level low finally lifting northeast Sunday ushering
in drier southwesterly flow. Dry and a more-relaxed southwesterly
flow is likely to remain over the region through the middle of
the week.
Temperatures near normal Friday and Saturday will go below normal
with the passage of the upper level trough Sunday, then climb back a
few degrees above normal by Tuesday.
&&
.AVIATION...(For the 06Z TAFS through 06Z Thursday night)
Issued at 1126 PM MDT Wed May 19 2021
A few showers continue at this hour with some stronger gusts mixed
into the mix. These showers will continue to die down over the
next few hours so a few stronger gusts can be expected as well.
The main aviation concern tomorrow will be the gusty winds. All
TAF sites will see gusty winds reaching 30 to 40kts...possibly
higher at times...during the afternoon and evening hours. Aside
from the winds, VFR conditions will be the rule across the
forecast area.
&&
.FIRE WEATHER...
Issued at 346 PM MDT Wed May 19 2021
Showers and storms will continue through this evening, favoring
high terrain with some drifting into adjacent valleys, generating
more wind than rain. Southwest flow will bring drier air and
stronger winds on Thursday, leading to widespread critical fire
weather conditions where fuels are critical. This now includes
lower elevations of southeast Utah, southwest Colorado and
northwest Colorado with the latest fuels update. Therefore,
upgraded the Fire Weather Watch for Thursday to a Red Flag Warning
for these zones where fuels are critical. The threat will be
limited to southeast Utah on Friday as moisture increases across
western Colorado, with strong winds remaining with wind gusts
approaching 50 mph both Thursday and Friday. Decided to issue a
Fire Weather Watch Friday for just the southeast Utah zones where
fuels are critical. Critical fire weather concerns return this
weekend as drier air returns with the trough passage to the north
as Friday's moisture exits to the east.
Just a friendly reminder to make sure your zone's fuel status is
updated as critical fire weather conditions appear to continue
through the weekend.
&&
.GJT WATCHES/WARNINGS/ADVISORIES...
CO...Red Flag Warning from 11 AM to 11 PM MDT Thursday for COZ200-202-
207-290-292-294-295.
Wind Advisory from 11 AM to 9 PM MDT Thursday for COZ001-002-020-
021.
Wind Advisory from 11 AM to 9 PM MDT Friday for COZ001.
UT...Red Flag Warning from 11 AM to 11 PM MDT Thursday for UTZ490-491.
Fire Weather Watch from Friday morning through Friday evening
for UTZ490-491.
Wind Advisory from 11 AM to 9 PM MDT Thursday for UTZ022-024-027-
029.
Wind Advisory from 11 AM to 9 PM MDT Friday for UTZ022-024-
027>029.
&&
SHORT TERM...MDA
LONG TERM...BM/MDA
AVIATION...TGR
FIRE WEATHER...TGJTHazardous weather outlook, May 19, 4:11 AM MDT, 23 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Grand Junction CO 411 AM MDT Wed May 19 2021 COZ001>014-017>023-UTZ022>025-027>029-201015- 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-Flat Tops- 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- 411 AM MDT Wed May 19 2021 This hazardous weather outlook is for eastern Utah and western Colorado. .DAY ONE...Today and Tonight Thunderstorm development will be possible again over much of the Colorado high country and adjacent valleys today...with a few isolated storms possible in the lower valleys. Gusty outflow winds and small hail will be the main threats. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday Afternoon thunderstorm development will be possible over portions of the eastern Utah and western Colorado through the remainder of the week. Critical fire weather conditions will become widespread by Thursday in strong/gusty winds. Additional fire concerns return this weekend. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
Nearby
Red Flag Warnings in Utah, 2021Every red flag 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.