Alert archive / Utah / Flash Flood Warnings in 1999

Flash Flood Warning 26, NWS Salt Lake City, UT

August 19, 1999Garfield County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 19, 1999, 5:30 PM MDT for Garfield County, Utah. It was in force for 90 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 19, 1999, 5:30 PM MDT (23:30 UTC)
Expired: Aug 19, 1999, 7:00 PM MDT
In force: 90 min
Issued by: NWS Salt Lake City, UT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Garfield County, UT

The radar

The Cedar City radar (KICX), 128 km from the middle of the area, began a volume at 23:30 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.5 hours before the alert went out and 294 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 11 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1924 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Salt Lake City, UT wrote its last area forecast discussion before this flash flood warning went out at Aug 19, 3:20 PM MDT, 2 hours 10 minutes earlier.

Area forecast discussion, Aug 19, 3:20 PM MDT, 2 hours 10 minutes before

UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH
320 PM MDT THU AUG 19 1999

SYNOPSIS...A MOIST AND SOMEWHAT UNSTABLE AIRMASS WILL BE OVER UTAH
THROUGH SATURDAY.

DISCUSSION...AMS OVER UTAH WILL REMAIN MOIST WITH AFTERNOON AND
EVENING INSTABILITY THE MAIN TRIGGER TO THE CONVECTION.

THUNDERSTORMS FIRING IN VARIOUS AREAS OF THE STATE ESPECIALLY WHERE
THE THE SKIES HAD ONLY PATCHY CLOUDS EARLIER IN THE DAY.

SHORT AND LONGER RANGE PROGS SHOW LITTLE CHANGE IN THE PATTERN
THROUGH THE FIRST OF NEXT WEEK.  A PORTION A TROF OFF THE WEST COAST
MOVES INTO NEVADA THE FIRST PART OF THE WEEKEND WITH THE TROF
SHEARING.  A VERY WEAK FRONTAL BOUNDARY STALLS IN EXTREME SOUTHERN
IDAHO LATE ON SATURDAY OR EARLY SUNDAY...BEING THE NORTHERN EDGE OF
THE MONSOON.

HATE TO BROAD-BRUSH THE FORECAST BUT ITS THE WAY IT HAS TO
BE...EVEN INTO THE FIRST PART OF NEXT WEEK.

SLC 4444 CDC 4444 ALDER

.SLC...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 3:54 PM MDT	Flash Flood Warning	SLC	Garfield	96 min

Nearby

Flash Flood Warnings in Utah, 1999 Every flash flood warning in 1999

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.