Alert archive / Utah / Flash Flood Warnings in 1997

Flash Flood Warning 49, NWS Salt Lake City, UT

September 9, 1997Summit County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 9, 1997, 4:53 PM MDT for Summit County, Utah. It was in force for 92 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
Sep 9, 1997, 4:53 PM MDT (22:53 UTC)
Expired
Sep 9, 1997, 6:25 PM MDT
In force
92 min
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Summit County, UT

The radar

The Salt Lake City radar (KMTX), 133 km from the middle of the area, began a volume at 22:55 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, 10.9 hours before the alert went out and 80 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 1997-09-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 54 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 1997-09-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 square meters per square second.1939Sfc1 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
54 J/kg
Mixed-layer CIN
-232 J/kg
Mixed-layer LCL
1725 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
66 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 092255
FFWSLC
UTC043-100025-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
453 PM MDT TUE SEP 9 1997

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY UT HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 625 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHERN UTAH

   ...EXTREME SOUTHWESTERN SUMMIT COUNTY
 
DOPPLER RADAR INDICATED THAT ALMOST 2 INCHES OF RAIN HAD FALLEN
JUST WEST OF PEOA AS OF 445 PZM.  FLASH FLOODING IS EXPECTED BETWEEN
PEOA AND ROCKPORT RESERVOIR UNTIL 625 PM.

 A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOVE TO HIGHER GROUND TO ESCAPE RISING WATER.

ERC...2252Z

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 8, 7:59 PM MDTFlash Flood WarningSLCWashington86 min
Sep 8, 10:26 PM MDTFlash Flood WarningSLCGarfield2 hr
Sep 9, 12:50 AM MDTFlash Flood WarningSLCGarfield2 hr

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.