Alert archive / Utah / Flash Flood Warnings in 2002

Flash Flood Warning 27, NWS Salt Lake City, UT

September 16, 2002Utah County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 16, 2002, 5:15 PM MDT for Utah 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
Sep 16, 2002, 5:15 PM MDT (23:15 UTC)
Expired
Sep 16, 2002, 8:15 PM MDT
In force
3 hr
Issued by
NWS Salt Lake City, UT
Area
Whole counties

County Utah County, UT

The radar

The Salt Lake City radar (KMTX), 143 km from the middle of the area, began a volume at 23:19 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, 11.3 hours before the alert went out and 76 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 2002-09-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2002-09-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2960 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
120 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 
WGUS55 KSLC 162315
FFWSLC
UTC049-170215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
510 PM MDT MON SEP 16 2002

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL UTAH COUNTY IN UTAH
  THIS INCLUDES THE CITIES OF...PROVO...PAYSON

* UNTIL 815 PM MDT

STEADY LIGHT TO MODERATE RAINS ARE EXPECTED TO CONTINUE OVER AND 
NEAR THE SPRINGVILLE AND SANTAQUIN BURN AREAS.  SOILS HAVE BEEN 
SATURATED BY PREVIOUS RAINS...WHICH IN THE ABSENCE OF VEGETATION 
CREATES A HIGHER HAZARD OF DEBRIS FLOWS AND FLASH FLOODING. 

TO REPORT FLASH FLOODING HAVE THE NEAREST LAW ENFORCEMENT AGENCY 
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN 
SALT LAKE CITY.

A FLASH FLOOD WATCH IS IN EFFECT FOR UTAH COUNTY IN UTAH UNTIL 9 PM 
THIS EVENING.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 16, 11:02 AM MDTSevere Thunderstorm WarningSLCBox Elder, Davis, Tooele, Weber43 min
Sep 16, 11:42 AM MDTSevere Thunderstorm WarningSLCBox Elder, Cache, Davis, Morgan, Salt Lake, Tooele and 1 more48 min
Sep 16, 5:18 PM MDTFlash Flood WarningSLCUtah3 hr

Nearby

Flash Flood Warnings in Utah, 2002Every flash flood warning in 2002

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.