Alert archive / Utah / Red Flag Warnings in 2019
Red Flag Warning 21, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this red flag warning at Sep 17, 2019, 3:36 AM MDT for 5 counties in Utah. It took effect at Sep 17, 2019, 10:00 AM MDT. It was in force for 11 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
- Sep 17, 2019, 3:36 AM MDT (09:36 UTC)
- In effect from
- Sep 17, 2019, 10:00 AM MDT
- Expired
- Sep 17, 2019, 9:00 PM MDT
- In force
- 11 hr
- Issued by
- NWS Salt Lake City, UT
Counties Garfield County, UT, Kane County, UT, San Juan County, UT, Washington County, UT, Wayne County, UT
The radar
The Cedar City radar (KICX), 120 km from the middle of the area, began a volume at 09:37 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
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 9.6 hours before the alert went out and 273 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
- 410 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1616 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 29 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
294 WWUS85 KSLC 170936 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 336 AM MDT Tue Sep 17 2019 UTZ494-498-172200- /O.CAN.KSLC.FW.W.0020.000000T0000Z-190917T1000Z/ /O.NEW.KSLC.FW.W.0021.190917T1600Z-190918T0300Z/ Henry Mountains-Grand Staircase- 336 AM MDT Tue Sep 17 2019 ...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 494 AND 498... ...RED FLAG WARNING IS CANCELLED FOR DRY THUNDERSTORMS AND GUSTY OUTFLOW WINDS FOR FIRE WEATHER ZONES 494 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 10 AM this morning to 9 PM MDT this evening. * AFFECTED AREA...Fire Weather Zone 494 Henry Mountains and Fire Weather Zone 498 Grand Staircase. * WINDS...West to southwest with gusts up to 30 mph are expected. * RELATIVE HUMIDITY...As low as 11 to 15 percent. * IMPACTS...The combination of gusty winds and low humidity will lead to rapid spread of fires. 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. && $$ UTZ478-482-489-492-493-495>497-171045- /O.CAN.KSLC.FW.W.0020.000000T0000Z-190917T1000Z/ Salt Lake Desert-Western Uintah Basin-San Rafael Swell- Central Utah West Desert-Central Utah Mountains- Color Country West Desert-Color Country Mountains-Mojave Desert- 336 AM MDT Tue Sep 17 2019 ...RED FLAG WARNING IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 478...482...489...492...493... 495...496 AND 497... The National Weather Service in Salt Lake City has cancelled the Red Flag Warning. $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
1 follow-up statement
248 WWUS85 KSLC 172107 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 307 PM MDT Tue Sep 17 2019 UTZ494-498-180300- /O.CON.KSLC.FW.W.0021.000000T0000Z-190918T0300Z/ Henry Mountains-Grand Staircase- 307 PM MDT Tue Sep 17 2019 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 494 AND 498... * AFFECTED AREA...Fire Weather Zone 494 Henry Mountains and Fire Weather Zone 498 Grand Staircase. * WINDS...West to southwest with gusts up to 30 mph are expected. * RELATIVE HUMIDITY...As low as 11 to 15 percent. * IMPACTS...The combination of gusty winds and low humidity will lead to rapid spread of fires. 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. && $$ UTZ495-181200- /O.NEW.KSLC.FW.A.0011.190918T1800Z-190920T0400Z/ Color Country West Desert- 307 PM MDT Tue Sep 17 2019 ...FIRE WEATHER WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH THURSDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 495... The National Weather Service in Salt Lake City has issued a Fire Weather Watch for wind and low relative humidity, which is in effect from Wednesday afternoon through Thursday evening. * AFFECTED AREA...Fire Weather Zone 495 Color Country West Desert. * WINDS...Southwest 20 to 25 mph with gusts near 40 mph. * RELATIVE HUMIDITY...10 to 15% with fair recoveries at night. * IMPACTS...The combination of low humidity and very strong winds is forecast. These conditions may lead to rapid spread of fires, especially during the afternoon and early evening hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Fire Weather Watch means that there is a potential for critical fire weather conditions. Continue to monitor for the latest forecasts and for possible Red Flag Warnings. && $$ 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 |
|---|---|---|---|---|
| Sep 16, 6:17 PM MDT | Special Weather Statement | SLC | Wasatch | 43 min |
| Sep 16, 6:29 PM MDT | Special Weather Statement | SLC | Wasatch | 46 min |
| Sep 16, 7:18 PM MDT | Special Weather Statement | SLC | Wasatch | 42 min |
| Sep 17, 3:07 PM MDT | Fire Weather Watch | SLC | Beaver, Iron, Washington | 13 hr |
Nearby
Red Flag Warnings in Utah, 2019Every red flag warning in 2019
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.