Alert archive / Utah / Red Flag Warnings in 2021
Red Flag Warning 10, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this red flag warning at May 23, 2021, 2:29 PM MDT for Washington County, Utah. It took effect at May 25, 2021, 2:00 PM MDT. It was in force for 8 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 23, 2021, 2:29 PM MDT (20:29 UTC)
- In effect from
- May 25, 2021, 2:00 PM MDT
- Expired
- May 25, 2021, 10:00 PM MDT
- In force
- 8 hr
- Issued by
- NWS Salt Lake City, UT
County Washington County, UT
The radar
The Cedar City radar (KICX), 66 km from the middle of the area, began a volume at 20:31 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
Las Vegas, NV (KVEF), launched 12:00Z, 8.5 hours before the alert went out and 207 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
- 2604 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
214 WWUS85 KSLC 232029 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 229 PM MDT Sun May 23 2021 UTZ498-241200- /O.NEW.KSLC.FW.W.0011.210526T1800Z-210527T0400Z/ /O.CON.KSLC.FW.W.0009.000000T0000Z-210524T0300Z/ Grand Staircase- 229 PM MDT Sun May 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... ...RED FLAG WARNING IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 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 10 PM MDT Wednesday. * AFFECTED AREA...Fire Weather Zone 498 Grand Staircase. * TIMING...Through 9 PM MDT this evening. * WINDS...Southwest 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ UTZ497-241200- /O.NEW.KSLC.FW.W.0010.210525T2000Z-210526T0400Z/ Mojave Desert- 229 PM MDT Sun May 23 2021 ...RED FLAG WARNING IN EFFECT FROM 2 PM TO 10 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 497... The National Weather Service in Salt Lake City has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 2 PM to 10 PM MDT Tuesday. * AFFECTED AREA...Fire Weather Zone 497 Mojave Desert. * TIMING...From 2 PM MDT to 10 PM MDT Wednesday. * WINDS...Southwest 15 to 20 mph with gusts over 30 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ489-496-240300- /O.CON.KSLC.FW.W.0009.000000T0000Z-210524T0300Z/ San Rafael Swell-Color Country Mountains- 229 PM MDT Sun May 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489 AND 496... * AFFECTED AREA...Fire Weather Zone 489 San Rafael Swell and Fire Weather Zone 496 Color Country Mountains. * TIMING...Through 9 PM MDT this evening. * WINDS...Southwest 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
6 follow-up statements
826 WWUS85 KSLC 232038 AAA RFWSLC URGENT - FIRE WEATHER MESSAGE...UPDATED National Weather Service Salt Lake City UT 238 PM MDT Sun May 23 2021 UTZ498-241200- /O.CON.KSLC.FW.W.0009.000000T0000Z-210524T0300Z/ /O.CON.KSLC.FW.W.0011.210526T1800Z-210527T0400Z/ Grand Staircase- 238 PM MDT Sun May 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... * AFFECTED AREA...Fire Weather Zone 498 Grand Staircase. * TIMING...Through 9 PM MDT this evening and also from noon to 10 PM MDT Wednesday. * WINDS...Southwest 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ489-496-240300- /O.CON.KSLC.FW.W.0009.000000T0000Z-210524T0300Z/ San Rafael Swell-Color Country Mountains- 238 PM MDT Sun May 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489 AND 496... * AFFECTED AREA...Fire Weather Zone 489 San Rafael Swell and Fire Weather Zone 496 Color Country Mountains. * TIMING...Through 9 PM MDT this evening. * WINDS...Southwest 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ UTZ497-241200- /O.CON.KSLC.FW.W.0010.210525T2000Z-210526T0400Z/ Mojave Desert- 238 PM MDT Sun May 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM TO 10 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 497... * AFFECTED AREA...Fire Weather Zone 497 Mojave Desert. * TIMING...From 2 PM MDT to 10 PM MDT Tuesday. * WINDS...Southwest 15 to 20 mph with gusts over 30 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
671 WWUS85 KSLC 240240 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 840 PM MDT Sun May 23 2021 UTZ498-241045- /O.EXP.KSLC.FW.W.0009.000000T0000Z-210524T0300Z/ /O.CON.KSLC.FW.W.0011.210526T1800Z-210527T0400Z/ Grand Staircase- 840 PM MDT Sun May 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... * AFFECTED AREA...Fire Weather Zone 498 Grand Staircase. * TIMING...From noon to 10 PM MDT Wednesday. * WINDS...Southwest 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ UTZ489-496-240345- /O.EXP.KSLC.FW.W.0009.000000T0000Z-210524T0300Z/ San Rafael Swell-Color Country Mountains- 840 PM MDT Sun May 23 2021 ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 489 AND 496... Winds and humidity will continue to improve this evening and critical fire weather conditions are no longer expected. $$ UTZ497-241045- /O.CON.KSLC.FW.W.0010.210525T2000Z-210526T0400Z/ Mojave Desert- 840 PM MDT Sun May 23 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM TO 10 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 497... * AFFECTED AREA...Fire Weather Zone 497 Mojave Desert. * TIMING...From 2 PM MDT to 10 PM MDT Tuesday. * WINDS...Southwest 15 to 20 mph with gusts over 30 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
484 WWUS85 KSLC 240917 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 317 AM MDT Mon May 24 2021 UTZ497-242300- /O.CON.KSLC.FW.W.0010.210525T2000Z-210526T0400Z/ Mojave Desert- 317 AM MDT Mon May 24 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM TO 10 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 497... * AFFECTED AREA...Fire Weather Zone 497 Mojave Desert. * TIMING...From 2 PM MDT to 10 PM MDT Tuesday. * WINDS...Southwest 15 to 20 mph with gusts over 30 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ498-242300- /O.CON.KSLC.FW.W.0011.210526T1800Z-210527T0400Z/ Grand Staircase- 317 AM MDT Mon May 24 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... * AFFECTED AREA...Fire Weather Zone 498 Grand Staircase. * TIMING...From noon to 10 PM MDT Wednesday. * WINDS...Southwest 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
215 WWUS85 KSLC 242028 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 228 PM MDT Mon May 24 2021 UTZ497-251200- /O.CON.KSLC.FW.W.0010.210525T2000Z-210526T0400Z/ Mojave Desert- 228 PM MDT Mon May 24 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM TO 10 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 497... * AFFECTED AREA...Fire Weather Zone 497 Mojave Desert. * TIMING...From 2 PM MDT to 10 PM MDT Tuesday. * WINDS...Southwest 15 to 20 mph with gusts over 30 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ498-251200- /O.CON.KSLC.FW.W.0011.210526T1800Z-210527T0400Z/ Grand Staircase- 228 PM MDT Mon May 24 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... * AFFECTED AREA...Fire Weather Zone 498 Grand Staircase. * TIMING...From noon to 10 PM MDT Wednesday. * WINDS...Southwest 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
890 WWUS85 KSLC 250939 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 339 AM MDT Tue May 25 2021 UTZ497-252300- /O.CON.KSLC.FW.W.0010.210525T2000Z-210526T0400Z/ Mojave Desert- 339 AM MDT Tue May 25 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 497... * AFFECTED AREA...Fire Weather Zone 497 Mojave Desert. * TIMING...From 2 PM MDT to 10 PM MDT Tuesday. * WINDS...Southwest 15 to 20 mph with gusts over 30 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ498-252300- /O.CON.KSLC.FW.W.0011.210526T1800Z-210527T0400Z/ Grand Staircase- 339 AM MDT Tue May 25 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... * AFFECTED AREA...Fire Weather Zone 498 Grand Staircase. * TIMING...From noon to 10 PM MDT Wednesday. * WINDS...Southwest 15 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
077 WWUS85 KSLC 252107 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 307 PM MDT Tue May 25 2021 UTZ497-260400- /O.CON.KSLC.FW.W.0010.000000T0000Z-210526T0400Z/ Mojave Desert- 307 PM MDT Tue May 25 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 497... * AFFECTED AREA...Fire Weather Zone 497 Mojave Desert. * TIMING...From 2 PM MDT to 10 PM MDT Tuesday. * WINDS...Southwest 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 6 percent. * IMPACTS...Any fires that develop could spread rapidly. Outdoor burning is not recommended. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ498-261100- /O.CON.KSLC.FW.W.0011.210526T1800Z-210527T0400Z/ Grand Staircase- 307 PM MDT Tue May 25 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 498... * AFFECTED AREA...Fire Weather Zone 498 Grand Staircase. * TIMING...From noon to 10 PM MDT Wednesday. * WINDS...Southwest 15 to 20 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 7 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
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 2:29 PM MDT | Red Flag Warning | SLC | Garfield, Kane, San Juan, Washington, Wayne | 3 days |
| May 23, 4:52 PM MDT | Special Weather Statement | SLC | Weber | 38 min |
| May 23, 5:04 PM MDT | Special Weather Statement | SLC | Utah | 56 min |
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.