Alert archive / Utah / Flash Flood Warnings in 1998

Flash Flood Warning 15, NWS Salt Lake City, UT

July 25, 1998Emery County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 25, 1998, 9:15 PM MDT for Emery County, Utah. It was in force for 8 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
Jul 25, 1998, 9:15 PM MDT (03:15 UTC)
Expired
Jul 26, 1998, 5:00 AM MDT
In force
8 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Emery County, UT

The radar

The Grand Junction radar (KGJX), 215 km from the middle of the area, began a volume at 03:16 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

Grand Junction, CO (KGJT), launched 00:00Z, 3.3 hours before the alert went out and 191 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, Grand Junction, CO at 00:00Z on 1998-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 120 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, Grand Junction, CO at 00:00Z on 1998-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 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
120 J/kg
Mixed-layer CIN
-88 J/kg
Mixed-layer LCL
1578 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
-15 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 260317
FFWSLC
UTC015-017-037-055-260415-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
915 PM MDT SAT JUL 25 1998

THE FLASH FLOOD WARNING FOR CAPITOL REEF NATIONAL PARK AND 
CANYONLANDS NATIONAL PApRK HAS BEEN ALLOWED TO EXPIRE.  

ADDITIONAL STORMS ARE POSSIBLE FOR THE REMAINDER OF THE NIGHT...THUS 
THESE AREAS REMAIN UNDER A FLASH FLOOD WATCH UNTIL 500 AM SUNDAY. 

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 7:13 PM MDTFlash Flood WarningSLCEmery, Garfield, San Juan, Wayne2 hr
Jul 25, 9:15 PM MDTFlash Flood WarningSLCGarfield, San Juan, Wayne8 hr
Jul 25, 9:53 PM MDTFlash Flood WarningSLCEmery2 hr
Jul 26, 12:39 PM MDTFlash Flood WarningSLCSanpete, Sevier2 hr
Jul 26, 1:00 PM MDTFlash Flood WarningSLCSan Juan3 hr
Jul 26, 5:00 PM MDTFlash Flood WarningSLCKane2 hr
Jul 26, 5:18 PM MDTFlash Flood WarningSLCDavis, Morgan, Weber57 min

Nearby

Flash Flood Warnings in Utah, 1998Every flash flood warning in 1998

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.