Alert archive / Utah / Red Flag Warnings in 2013
Red Flag Warning 21, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this red flag warning at Aug 17, 2013, 2:51 AM MDT for 5 counties in Utah. It took effect at Aug 17, 2013, 12:00 PM MDT. It was in force for 9 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
- Aug 17, 2013, 2:51 AM MDT (08:51 UTC)
- In effect from
- Aug 17, 2013, 12:00 PM MDT
- Expired
- Aug 17, 2013, 9:00 PM MDT
- In force
- 9 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 08:56 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
Salt Lake City I, UT (KSLC), launched 00:00Z, 8.9 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4242 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
744 WWUS85 KSLC 170851 RFWSLC URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SALT LAKE CITY UT 251 AM MDT SAT AUG 17 2013 UTZ478-172200- /O.UPG.KSLC.FW.A.0010.130817T1800Z-130818T0300Z/ /O.NEW.KSLC.FW.W.0021.130817T1800Z-130818T0300Z/ SALT LAKE DESERT- 251 AM MDT SAT AUG 17 2013 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONE 478... 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 TODAY TO 9 PM MDT THIS EVENING. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. * AFFECTED AREA...FIRE WEATHER ZONE 478 SALT LAKE DESERT. * OUTFLOW WINDS...STRONG OUTFLOW WINDS WITH GUSTS OVER 40 MPH WILL BE POSSIBLE WITH SHOWERS AND THUNDERSTORMS. * RELATIVE HUMIDITY...HUMIDITY VALUES IN THE 5 TO 15 PERCENT RANGE...WITH THE LOWEST VALUES DURING THE AFTERNOON HOURS. * IMPACTS...ANY EXISTING FIRES ARE EXPECTED TO EXHIBIT EXTREME FIRE BEHAVIOR. LIGHTNING FROM ANY THUNDERSTORMS DEVELOPING ON SATURDAY WILL LIKELY CONTRIBUTE TO NEW STARTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES CAN CONTRIBUTE TO EXTREME FIRE BEHAVIOR. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
2 follow-up statements
619 WWUS85 KSLC 171457 RFWSLC URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SALT LAKE CITY UT 857 AM MDT SAT AUG 17 2013 UTZ478-180300- /O.CON.KSLC.FW.W.0021.130817T1800Z-130818T0300Z/ SALT LAKE DESERT- 857 AM MDT SAT AUG 17 2013 ...RED FLAG WARNING REMAINS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS EVENING FOR DRY THUNDERSTORMS AND GUSTY OUTFLOW WINDS FOR FIRE WEATHER ZONE 478... * AFFECTED AREA...FIRE WEATHER ZONE 478 SALT LAKE DESERT. * THUNDERSTORMS...WIDELY SCATTERED DRY THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON AND EVENING. * OUTFLOW WINDS...STRONG OUTFLOW WINDS WITH GUSTS OVER 40 MPH WILL BE POSSIBLE. * RELATIVE HUMIDITY...HUMIDITY VALUES IN THE 5 TO 15 PERCENT RANGE...WITH THE LOWEST VALUES DURING THE AFTERNOON HOURS. * IMPACTS...ANY EXISTING FIRES ARE EXPECTED TO EXHIBIT EXTREME FIRE BEHAVIOR. LIGHTNING FROM ANY THUNDERSTORMS DEVELOPING ON SATURDAY WILL LIKELY CONTRIBUTE TO NEW STARTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES CAN CONTRIBUTE TO EXTREME FIRE BEHAVIOR. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SALTLAKECITY (ALL LOWER CASE)
529 WWUS85 KSLC 172124 RFWSLC URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SALT LAKE CITY UT 324 PM MDT SAT AUG 17 2013 UTZ478-180300- /O.CON.KSLC.FW.W.0021.000000T0000Z-130818T0300Z/ SALT LAKE DESERT- 324 PM MDT SAT AUG 17 2013 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 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...WIDELY SCATTERED DRY THUNDERSTORMS ARE EXPECTED THROUGH THIS EVENING...MAINLY OVER WESTERN PORTIONS OF THE ZONE. WETTING RAINS CAN BE EXPECTED WITH STORMS OVER THE EASTERN PORTION OF THE ZONE. * OUTFLOW WINDS...STRONG OUTFLOW WINDS WITH GUSTS OVER 40 MPH WILL BE POSSIBLE. * RELATIVE HUMIDITY...HUMIDITY VALUES IN THE 5 TO 15 PERCENT RANGE...WITH THE LOWEST VALUES DURING THE AFTERNOON HOURS. * IMPACTS...ANY EXISTING FIRES ARE EXPECTED TO EXHIBIT EXTREME FIRE BEHAVIOR. LIGHTNING FROM ANY THUNDERSTORMS DEVELOPING ON SATURDAY WILL LIKELY CONTRIBUTE TO NEW STARTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. 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 (ALL LOWER CASE)
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 9:36 AM MDT | Flash Flood Warning | SLC | Garfield, Kane | 3 hr |
| Aug 17, 12:20 PM MDT | Flash Flood Warning | SLC | Carbon, Emery | 3 hr |
| Aug 17, 1:19 PM MDT | Flash Flood Warning | SLC | Juab, Millard | 3 hr |
| Aug 17, 3:14 PM MDT | Areal Flood Advisory | SLC | Utah | 2 hr |
Nearby
Red Flag Warnings in Utah, 2013Every red flag warning in 2013
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.