Alert archive / Utah / Red Flag Warnings in 2021
Red Flag Warning 4, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this red flag warning at Apr 17, 2021, 2:49 PM MDT for 14 counties in Utah. It took effect at Apr 19, 2021, 10:00 AM MDT. It was in force for 11 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 17, 2021, 2:49 PM MDT (20:49 UTC)
- In effect from
- Apr 19, 2021, 10:00 AM MDT
- Expired
- Apr 19, 2021, 9:00 PM MDT
- In force
- 11 hr
- Issued by
- NWS Salt Lake City, UT
Counties Beaver County, UT, Carbon County, UT, Duchesne County, UT, Emery County, UT, Garfield County, UT, Iron County, UT, Juab County, UT, Kane County, UT, Millard County, UT, San Juan County, UT, Sanpete County, UT, Wasatch County, UT, Washington County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 159 km from the middle of the area, began a volume at 20:53 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 |
|---|---|---|---|
| Apr 19, 7:20 PM MDT | NON-TSTM WND GST 51 | 8 Se La Sal Jct Arpt, UT | MESONET STATION BIVU1 BIG INDIAN VALLEY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 12:00Z, 8.8 hours before the alert went out and 230 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2187 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
826 WWUS85 KSLC 172049 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 249 PM MDT Sat Apr 17 2021 UTZ489-494-495-497-498-181200- /O.UPG.KSLC.FW.A.0003.210419T1800Z-210420T0300Z/ /O.NEW.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ San Rafael Swell-Henry Mountains-Color Country West Desert- Mojave Desert-Grand Staircase- 249 PM MDT Sat Apr 17 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489, 494, 495, 497, AND 498... The National Weather Service in Salt Lake City has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon to 9 PM MDT Monday. The Fire Weather Watch is no longer in effect. * AFFECTED AREA...Fire Weather Zone 489 San Rafael Swell, Fire Weather Zone 494 Henry Mountains, Fire Weather Zone 495 Color Country West Desert, Fire Weather Zone 497 Mojave Desert and Fire Weather Zone 498 Grand Staircase. * WINDS...West 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ492-181200- /O.NEW.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ Central Utah West Desert- 249 PM MDT Sat Apr 17 2021 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 492 BELOW 6000 FEET... The National Weather Service in Salt Lake City has issued a Red Flag Warning below 6000 feet for wind and low relative humidity, which is in effect from noon to 9 PM MDT Monday. * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert. * WINDS...Northwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
5 follow-up statements
757 WWUS85 KSLC 180900 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 300 AM MDT Sun Apr 18 2021 UTZ489-494-495-497-498-182300- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ San Rafael Swell-Henry Mountains-Color Country West Desert- Mojave Desert-Grand Staircase- 300 AM MDT Sun Apr 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489, 494, 495, 497, AND 498... * AFFECTED AREA...Fire Weather Zone 489 San Rafael Swell, Fire Weather Zone 494 Henry Mountains, Fire Weather Zone 495 Color Country West Desert, Fire Weather Zone 497 Mojave Desert and Fire Weather Zone 498 Grand Staircase. * WINDS...West 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ492-182300- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ Central Utah West Desert- 300 AM MDT Sun Apr 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 492 BELOW 6000 FEET... * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert. * WINDS...Northwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
792 WWUS85 KSLC 182120 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 320 PM MDT Sun Apr 18 2021 UTZ489-494-495-497-498-191200- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ San Rafael Swell-Henry Mountains-Color Country West Desert- Mojave Desert-Grand Staircase- 320 PM MDT Sun Apr 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489, 494, 495, 497, AND 498... * AFFECTED AREA...Fire Weather Zone 489 San Rafael Swell, Fire Weather Zone 494 Henry Mountains, Fire Weather Zone 495 Color Country West Desert, Fire Weather Zone 497 Mojave Desert and Fire Weather Zone 498 Grand Staircase. * WINDS...West 15 to 25 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ492-191200- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ Central Utah West Desert- 320 PM MDT Sun Apr 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT MONDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 492 BELOW 6000 FEET... * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert. * WINDS...Northwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 12 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
989 WWUS85 KSLC 190925 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 325 AM MDT Mon Apr 19 2021 UTZ482-191730- /O.EXB.KSLC.FW.W.0004.210419T1600Z-210420T0300Z/ Western Uintah Basin- 325 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 482... The National Weather Service in Salt Lake City has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM this morning to 9 PM MDT this evening. * AFFECTED AREA...Fire Weather Zone 482 Western Uintah Basin. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...Around 15 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ483-484-191730- /O.EXB.KSLC.FW.W.0004.210419T1600Z-210420T0300Z/ Southern Ashley National Forest-Tavaputs Plateau- 325 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 483 AND 484 BELOW 7000 FEET... The National Weather Service in Salt Lake City has issued a Red Flag Warning below 7000 feet for wind and low relative humidity, which is in effect from 10 AM this morning to 9 PM MDT this evening. * AFFECTED AREA...Fire Weather Zone 483 Southern Ashley National Forest and Fire Weather Zone 484 Tavaputs Plateau. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...Around 15 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ489-494-495-497-498-191730- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ San Rafael Swell-Henry Mountains-Color Country West Desert- Mojave Desert-Grand Staircase- 325 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489, 494, 495, 497, AND 498... * AFFECTED AREA...Fire Weather Zone 489 San Rafael Swell, Fire Weather Zone 494 Henry Mountains, Fire Weather Zone 495 Color Country West Desert, Fire Weather Zone 497 Mojave Desert and Fire Weather Zone 498 Grand Staircase. * WINDS...West 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 8 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ492-191730- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ Central Utah West Desert- 325 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 492 BELOW 6000 FEET... * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert. * WINDS...Northwest 15 to 25 mph with gusts up to 40 mph. * RELATIVE HUMIDITY...As low as 11 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
626 WWUS85 KSLC 191653 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 1053 AM MDT Mon Apr 19 2021 UTZ489-494-495-497-498-200300- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ San Rafael Swell-Henry Mountains-Color Country West Desert- Mojave Desert-Grand Staircase- 1053 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489, 494, 495, 497, AND 498... * AFFECTED AREA...Fire Weather Zone 489 San Rafael Swell, Fire Weather Zone 494 Henry Mountains, Fire Weather Zone 495 Color Country West Desert, Fire Weather Zone 497 Mojave Desert and Fire Weather Zone 498 Grand Staircase. * WINDS...West 20 to 30 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 9 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ482-200300- /O.CON.KSLC.FW.W.0004.000000T0000Z-210420T0300Z/ Western Uintah Basin- 1053 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 482... * AFFECTED AREA...Fire Weather Zone 482 Western Uintah Basin. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...Around 15 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ492-200300- /O.CON.KSLC.FW.W.0004.210419T1800Z-210420T0300Z/ Central Utah West Desert- 1053 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 492 BELOW 6000 FEET... * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert. * WINDS...Northwest 15 to 25 mph with gusts up to 45 mph. * RELATIVE HUMIDITY...As low as 11 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ483-484-200300- /O.CON.KSLC.FW.W.0004.000000T0000Z-210420T0300Z/ Southern Ashley National Forest-Tavaputs Plateau- 1053 AM MDT Mon Apr 19 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 483 AND 484 BELOW 7000 FEET... * AFFECTED AREA...Fire Weather Zone 483 Southern Ashley National Forest and Fire Weather Zone 484 Tavaputs Plateau. * WINDS...West 25 to 35 mph with gusts up to 55 mph. * RELATIVE HUMIDITY...Around 15 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
043 WWUS85 KSLC 200321 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 921 PM MDT Mon Apr 19 2021 UTZ482>484-489-492-494-495-497-498-200430- /O.EXP.KSLC.FW.W.0004.000000T0000Z-210420T0300Z/ Western Uintah Basin-Southern Ashley National Forest- Tavaputs Plateau-San Rafael Swell-Central Utah West Desert- Henry Mountains-Color Country West Desert-Mojave Desert- Grand Staircase- 921 PM MDT Mon Apr 19 2021 ...RED FLAG WARNING HAS EXPIRED FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 482, 483, 484, 489, 492, 494, 495, 497, AND 498... Winds will continue to trend downward across the area this evening while relative humidities increase. $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 3:16 AM MDT | Fire Weather Watch | SLC | Beaver, Carbon, Emery, Garfield, Iron, Kane and 3 more | 12 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.