Alert archive / Utah / Red Flag Warnings in 2017
Red Flag Warning 13, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this red flag warning at Jul 18, 2017, 11:38 AM MDT for 5 counties in Utah. It took effect at Jul 19, 2017, 11:00 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
- Jul 18, 2017, 11:38 AM MDT (17:38 UTC)
- In effect from
- Jul 19, 2017, 11:00 AM MDT
- Expired
- Jul 19, 2017, 10:00 PM MDT
- In force
- 11 hr
- Issued by
- NWS Salt Lake City, UT
Counties Box Elder County, UT, Davis County, UT, Salt Lake County, UT, Tooele County, UT, Utah County, UT
The radar
The Salt Lake City radar (KMTX), 57 km from the middle of the area, began a volume at 17:36 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 19, 4:00 PM MDT | FLOOD | Salem, UT | URBAN FLOODING IMPACTED ABOUT 100 HOMES WITH SEVERAL SUFFERING SIGIFICANT BASEMENT DAMAGE. |
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, 5.6 hours before the alert went out and 41 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
- 69 J/kg
- Mixed-layer CIN
- -304 J/kg
- Mixed-layer LCL
- 2334 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 59 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
867 WWUS85 KSLC 181738 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 1138 AM MDT Tue Jul 18 2017 UTZ478-190500- /O.NEW.KSLC.FW.W.0013.170719T1700Z-170720T0400Z/ Salt Lake Desert- 1138 AM MDT Tue Jul 18 2017 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 10 PM MDT WEDNESDAY FOR DRY THUNDERSTORMS AND GUSTY OUTFLOW WINDS FOR FIRE WEATHER ZONE 478... The National Weather Service in Salt Lake City has issued a Red Flag Warning for dry thunderstorms and gusty outflow winds... which is in effect from 11 AM to 10 PM MDT Wednesday. * AFFECTED AREA...Fire Weather Zone 478 Salt Lake Desert. * THUNDERSTORMS...Isolated to possibly scattered dry and wet thunderstorms will develop by midday. * OUTFLOW WINDS...Winds near the showers and thunderstorms will be gusty and erratic, with typical speeds of 30 to 45 mph. * IMPACTS...The threat of dry lightning and gusty microburst winds may be conducive to the start and rapid growth of new fires as well as spread of existing. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
3 follow-up statements
486 WWUS85 KSLC 190509 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 1109 PM MDT Tue Jul 18 2017 UTZ478-200400- /O.CON.KSLC.FW.W.0013.170719T1700Z-170720T0400Z/ Salt Lake Desert- 1109 PM MDT Tue Jul 18 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 10 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 478... * AFFECTED AREA...Fire Weather Zone 478 Salt Lake Desert. * THUNDERSTORMS...Isolated to possibly scattered dry and wet thunderstorms will develop by midday. * OUTFLOW WINDS...Winds near the showers and thunderstorms will be gusty and erratic, with typical speeds of 30 to 45 mph. * IMPACTS...The threat of dry lightning and gusty microburst winds may be conducive to the start and rapid growth of new fires as well as spread of existing. PRECAUTIONARY/PREPAREDNESS ACTIONS... Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of lightning...dry fuel conditions...and gusty microburst winds will create favorable conditions for new fire starts and extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
322 WWUS85 KSLC 191012 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 412 AM MDT Wed Jul 19 2017 UTZ478-192115- /O.CON.KSLC.FW.W.0013.170719T1700Z-170720T0400Z/ Salt Lake Desert- 412 AM MDT Wed Jul 19 2017 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 10 PM MDT THIS EVENING FOR DRY THUNDERSTORMS AND GUSTY OUTFLOW WINDS FOR FIRE WEATHER ZONE 478... * AFFECTED AREA...Fire Weather Zone 478 Salt Lake Desert. * THUNDERSTORMS...Isolated to possibly scattered dry and wet thunderstorms will develop by midday. * OUTFLOW WINDS...Winds near the showers and thunderstorms will be gusty and erratic, with typical speeds of 30 to 45 mph. * IMPACTS...The threat of dry lightning and gusty microburst winds may be conducive to the start and rapid growth of new fires as well as spread of existing fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
954 WWUS85 KSLC 192045 RFWSLC URGENT - FIRE WEATHER MESSAGE National Weather Service Salt Lake City UT 245 PM MDT Wed Jul 19 2017 UTZ478-200400- /O.CON.KSLC.FW.W.0013.000000T0000Z-170720T0400Z/ Salt Lake Desert- 245 PM MDT Wed Jul 19 2017 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 10 PM MDT THIS EVENING FOR DRY THUNDERSTORMS AND GUSTY OUTFLOW WINDS FOR FIRE WEATHER ZONE 478... * AFFECTED AREA...Fire Weather Zone 478 Salt Lake Desert. * THUNDERSTORMS...Isolated to possibly scattered dry and wet thunderstorms will continue to develop this afternoon into this evening, primarily over southern portions of the zone. * OUTFLOW WINDS...Winds near the showers and thunderstorms will be gusty and erratic, with typical speeds of 30 to 45 mph. * IMPACTS...The threat of dry lightning and gusty microburst winds will be conducive to the start and rapid growth of new fires as well as spread of existing fires. PRECAUTIONARY/PREPAREDNESS ACTIONS... Red Flag Warning means that critical fire weather conditions are either occurring now...or are imminent. A combination of lightning...dry fuel conditions...and gusty microburst winds will create favorable conditions for new fire starts and extreme fire behavior. && $$ For more information from NOAA/National Weather Service visit... http://weather.gov/saltlakecity
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 6:05 PM MDT | Severe Thunderstorm Warning | SLC | Salt Lake, Tooele | 40 min |
| Jul 17, 7:28 PM MDT | Special Weather Statement | SLC | Rich | 47 min |
| Jul 17, 8:12 PM MDT | Flash Flood Warning | SLC | Iron, Kane, Washington | 6 hr |
| Jul 18, 1:59 PM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Jul 18, 3:09 PM MDT | Flash Flood Watch | SLC | 31 hr |
Nearby
Red Flag Warnings in Utah, 2017Every red flag warning in 2017
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.