Alert archive / Utah / Flash Flood Warnings in 1998

Flash Flood Warning 12, NWS Salt Lake City, UT

July 25, 1998Weber County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 25, 1998, 3:14 AM MDT for Weber County, Utah. It was in force for 3 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, 3:14 AM MDT (09:14 UTC)
Expired
Jul 25, 1998, 6:13 AM MDT
In force
3 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Weber County, UT

The radar

The Salt Lake City radar (KMTX), 45 km from the middle of the area, began a volume at 09:16 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

Salt Lake City I, UT (KSLC), launched 00:00Z, 9.2 hours before the alert went out and 54 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 00:00Z on 1998-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 408 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 00:00Z on 1998-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 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
408 J/kg
Mixed-layer CIN
-21 J/kg
Mixed-layer LCL
1293 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
62 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 250915
FFWSLC
UTC057-251210-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
314 AM MDT SAT JUL 25 1998


THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN WEBER COUNTY

* UNTIL 613 AM MDT

* AREAS SPECIFICALLY AFFECTED INCLUDE NORTH OGDEN TO PLEASANT
VIEW...AREAS WHICH DRAIN OFF BEN LOMOND PEAK

AT 300 AM MDT LAW ENFORECEMT OFFICIALS REPORTED SIGNIFICANT BASEMENT
FLOODING OCCURRING IN THE POLE PATCH SUBDIVISION IN PLEASANT VIEW
AS WELL AS IN NORTH OGDEN.  NUMEROUS HOMES HAVE BEEN EVACUATED
AND ADDITIONAL EVACUATIONS MAY BE NECESSARY.

PEOPLE IN THE WARNED AREA SHOULD MONITOR FLOOD CONDITIONS...AND BE
PREPARED TO MOVE TO HIGHER GROUND...SHOULD FLOODWATERS THREATEN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.

&

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 6:29 PM MDTFlash Flood WarningSLCSummit2 hr

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.