Alert archive / Utah / Flash Flood Warnings in 1997

Flash Flood Warning 27, NWS Salt Lake City, UT

August 17, 1997Utah County, Wasatch County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 17, 1997, 3:26 PM MDT for Utah County, Wasatch County, Utah. It was in force for 44 min. 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, 1997, 3:26 PM MDT (21:26 UTC)
Expired
Aug 17, 1997, 4:10 PM MDT
In force
44 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

Counties Utah County, UT, Wasatch County, UT

The radar

The Salt Lake City radar (KMTX), 144 km from the middle of the area, began a volume at 21:30 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 12:00Z, 9.4 hours before the alert went out and 74 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.

Skew-T log-pSkew-T log-p diagram, Salt Lake City I, UT at 12:00Z on 1997-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 12 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 1997-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
12 J/kg
Mixed-layer CIN
-401 J/kg
Mixed-layer LCL
2609 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSLC 172132
FFWSLC
UTC049-051-172210-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD/SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
326 PM MDT SUN AUG 17 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
FLASH FLOOD/SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 410 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...

IN NORTHWESTERN UTAH

   ...NORTHEASTERN UTAH COUNTY

IN NORTHEASTERN UTAH

   ...WESTERN WASATCH COUNTY
 
THE SEVERE THUNDERSTORM HAS BEEN AMENDED TO NOW BE A FLASH FLOOD
WARNING AND A SEVERE THUNDERSTORM WARNING.  THIS FLASH FLOOD
WARNING MAINLY AFFECTS AMERICAN FORK CANYON IN EASTERN UTAH COUNTY.
1.75 INCHES OF RAIN WAS REPORTED IN AMERICAN FORK.  THIS STORM WILL
MOVE INTO THE CANYON WITH HEAVY RAIN FALL CONTINUING...LEADING
TO FLASH FLOODING IN THE CANYON
 
HEAVY THUNDERSTORM RAINS CAN QUICKLY FLOOD ROADS.  DO NOT ATTEMPT TO
DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 17, 2:15 PM MDTSevere Thunderstorm WarningSLCSalt Lake45 min
Aug 17, 3:08 PM MDTSevere Thunderstorm WarningSLCUtah, Wasatch42 min
Aug 17, 3:08 PM MDTSevere Thunderstorm WarningSLCSummit42 min
Aug 17, 3:49 PM MDTSevere Thunderstorm WarningSLCTooele41 min
Aug 17, 5:43 PM MDTSevere Thunderstorm WarningSLCTooele, Utah42 min

Nearby

Flash Flood Warnings in Utah, 1997Every flash flood warning in 1997

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.