Alert archive / Utah / Flash Flood Warnings in 1998
Flash Flood Warning 38, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 21, 1998, 6:12 PM MDT for Emery County, Utah. It was in force for 78 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Aug 21, 1998, 6:12 PM MDT (00:12 UTC)
- Expired
- Aug 21, 1998, 7:30 PM MDT
- In force
- 78 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Emery County, UT
The radar
The Grand Junction radar (KGJX), 216 km from the middle of the area, began a volume at 00:12 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, 0.2 hours before the alert went out and 252 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.
- Mixed-layer CAPE
- 65 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 3375 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 58 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSLC 220013
FFWSLC
UTC015-220130-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
612 PM MDT FRI AUG 21 1998
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
SOUTHERN EMERY COUNTY IN UTAH
* UNTIL 730 PM MDT
* AT 606 PM MDT WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
RAIN OVER SOUTH CENTRAL EMERY COUNTY...OR ABOUT 22 MILES NORTH
OF HANKSVILLE...MOVING SOUTHEAST AT 20 MILES PER HOUR.
A PAIR OF STRONG THUNDERSTORMS SOUTH OF INTERSTATE 70 ARE PRODUCING
EXCESSIVE RAINFALL. ONE STORM WILL CROSS STATE ROUTE 24 NEAR HALL
RESERVOIR WHILE THE SECOND WILL AFFECT REMOTE RECREATIONAL AREAS
ALONG THE SAN RAFAEL SWELL COUNTRY.
EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS
AND STREAMS...AND NORMALLY DRY WASHES. HIKERS AND CAMPERS IN THE
WARNING AREA SHOULD SEEK HIGHER GROUND IMMEDIATELY.
TO REPORT FLASH FLOODING HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY.
STAY TUNED TO LOCAL TELEVISION...RADIO...CABLE TV...OR NOAA WEATHER
RADIO FOR UPDATES.
LAT...LON 3878 11100 3855 11105 3853 11018 3896 11010The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 8:39 PM MDT | Flash Flood Warning | SLC | San Juan | 66 min |
| Aug 21, 9:48 PM MDT | Flash Flood Warning | SLC | San Juan | 57 min |
| Aug 22, 1:23 PM MDT | Severe Thunderstorm Warning | SLC | Duchesne | 37 min |
| Aug 22, 1:30 PM MDT | Flash Flood Warning | SLC | Duchesne | 60 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.