Alert archive / Utah / Red Flag Warnings in 2020
Red Flag Warning 21, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this red flag warning at Jul 22, 2020, 2:24 PM MDT for 6 counties in Utah. It took effect at Jul 23, 2020, 12:00 PM MDT. It was in force for 9 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
- Jul 22, 2020, 2:24 PM MDT (20:24 UTC)
- In effect from
- Jul 23, 2020, 12:00 PM MDT
- Expired
- Jul 23, 2020, 9:00 PM MDT
- In force
- 9 hr
- Issued by
- NWS Salt Lake City, UT
Counties Beaver County, UT, Iron County, UT, Juab County, UT, Millard County, UT, Sanpete County, UT, Washington County, UT
The radar
The Cedar City radar (KICX), 113 km from the middle of the area, began a volume at 20:28 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 23, 2:03 PM MDT | DEBRIS FLOW | 3 N Zion Np, UT | *** 2 INJ *** MULTIPLE ROCKSLIDES ALONG RIVER WALK TRAIL AND INTO THE RIVER. TWO KNOWN MINOR INJURIES FROM ROCKFALLS. |
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, 8.4 hours before the alert went out and 257 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
- 11 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 3257 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -32 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
655 WWUS85 KSLC 222024 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 224 PM MDT Wed Jul 22 2020 UTZ495-230600- /O.NEW.KSLC.FW.W.0021.200723T1800Z-200724T0300Z/ /O.CON.KSLC.FW.W.0020.000000T0000Z-200723T0400Z/ Color Country West Desert- 224 PM MDT Wed Jul 22 2020 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 495... ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 495... 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 Thursday. In addition...a red flag warning remains in effect for wind and low relative humidity through 9 PM this evening. * AFFECTED AREA...Fire Weather Zone 495 Color Country West Desert. * WINDS...South 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Critical fire weather conditions are expected. Any fire starts will spread rapidly. 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. && $$ UTZ492-230600- /O.NEW.KSLC.FW.W.0021.200723T1800Z-200724T0300Z/ Central Utah West Desert- 224 PM MDT Wed Jul 22 2020 ...RED FLAG WARNING IN EFFECT FROM NOON TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 492... The National Weather Service in Salt Lake City has issued a Red Flag Warning for wind and low relative humidity, which is in effect from noon to 9 PM MDT Thursday. * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert. * WINDS...South 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Critical fire weather conditions are expected. Any fire starts will spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ478-479-481>484-230400- /O.CON.KSLC.FW.W.0020.000000T0000Z-200723T0400Z/ Salt Lake Desert-Wasatch Mountains-Western Ashley National Forest- Western Uintah Basin-Southern Ashley National Forest- Tavaputs Plateau- 224 PM MDT Wed Jul 22 2020 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR DRY THUNDERSTORMS AND GUSTY OUTFLOW WINDS FOR FIRE WEATHER ZONES 478...479...481...482...483 AND 484... * AFFECTED AREA...Fire Weather Zone 478 Salt Lake Desert...Fire Weather Zone 479 Wasatch Mountains...Fire Weather Zone 481 Western Ashley National Forest...Fire Weather Zone 482 Western Uintah Basin...Fire Weather Zone 483 Southern Ashley National Forest and Fire Weather Zone 484 Tavaputs Plateau. * IMPACTS...Lightning in areas of critically dry fuels will result in new fire starts. Strong and erratic outflow winds will result in erratic fire behavior. * THUNDERSTORMS...Developing this afternoon and continuing through this evening. * OUTFLOW WINDS...Wind gusts in excess of 40 mph possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of lightning...dry fuel conditions...and gusty microburst winds will create favorable conditions for new fire starts and extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
3 follow-up statements
306 WWUS85 KSLC 230402 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 1002 PM MDT Wed Jul 22 2020 UTZ495-231215- /O.EXP.KSLC.FW.W.0020.000000T0000Z-200723T0400Z/ /O.CON.KSLC.FW.W.0021.200723T1800Z-200724T0300Z/ Color Country West Desert- 1002 PM MDT Wed Jul 22 2020 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 495... * AFFECTED AREA...Fire Weather Zone 495 Color Country West Desert. * WINDS...South 10 to 20 mph with gusts up to 35 mph Thursday afternoon. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Critical fire weather conditions are expected. Any fire starts will spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ UTZ478-479-481>484-230515- /O.EXP.KSLC.FW.W.0020.000000T0000Z-200723T0400Z/ Salt Lake Desert-Wasatch Mountains-Western Ashley National Forest- Western Uintah Basin-Southern Ashley National Forest- Tavaputs Plateau- 1002 PM MDT Wed Jul 22 2020 ...RED FLAG WARNING HAS EXPIRED FOR DRY THUNDERSTORMS AND GUSTY OUTFLOW WINDS FOR FIRE WEATHER ZONES 478...479...481...482...483 AND 484... The threat for dry thunderstorms and strong outflow has diminished. $$ UTZ492-231215- /O.CON.KSLC.FW.W.0021.200723T1800Z-200724T0300Z/ Central Utah West Desert- 1002 PM MDT Wed Jul 22 2020 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 492... * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert. * WINDS...South 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Critical fire weather conditions are expected. Any fire starts will spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
947 WWUS85 KSLC 230909 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 309 AM MDT Thu Jul 23 2020 UTZ492-495-232115- /O.CON.KSLC.FW.W.0021.200723T1800Z-200724T0300Z/ Central Utah West Desert-Color Country West Desert- 309 AM MDT Thu Jul 23 2020 ...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 492 AND 495... * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert and Fire Weather Zone 495 Color Country West Desert. * WINDS...South 10 to 20 mph with gusts up to 35 mph Thursday afternoon. * RELATIVE HUMIDITY...As low as 10 percent. * IMPACTS...Critical fire weather conditions are expected. Any fire starts will spread rapidly. 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
077 WWUS85 KSLC 232034 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 234 PM MDT Thu Jul 23 2020 UTZ492-495-240300- /O.CON.KSLC.FW.W.0021.000000T0000Z-200724T0300Z/ Central Utah West Desert-Color Country West Desert- 234 PM MDT Thu Jul 23 2020 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 492 AND 495... * AFFECTED AREA...Fire Weather Zone 492 Central Utah West Desert and Fire Weather Zone 495 Color Country West Desert. * WINDS...South 10 to 20 mph with gusts up to 30 mph through early this evening. * RELATIVE HUMIDITY...Near 15 percent. * IMPACTS...Critical fire weather conditions are expected. Any fire starts will spread rapidly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ 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 |
|---|---|---|---|---|
| Jul 22, 5:27 PM MDT | Special Weather Statement | SLC | Tooele | 48 min |
| Jul 22, 5:34 PM MDT | Special Weather Statement | SLC | Garfield | 41 min |
Nearby
Red Flag Warnings in Utah, 2020Every red flag warning in 2020
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.