Alert archive / Utah / Flash Flood Warnings in 1998
Flash Flood Warning 5, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 21, 1998, 5:41 PM MDT for Washington 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Jul 21, 1998, 5:41 PM MDT (23:41 UTC)
- Expired
- Jul 21, 1998, 8:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Washington County, UT
The radar
The Cedar City radar (KICX), 77 km from the middle of the area, began a volume at 23:44 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
Mercury/Desert R, NV (KDRA), launched 12:00Z, 11.7 hours before the alert went out and 221 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
- 122 J/kg
- Mixed-layer CIN
- -198 J/kg
- Mixed-layer LCL
- 2317 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -5 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 212350
FFWSLC
UTC053-220245-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
541 PM MDT TUE JUL 21 1998
THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A
* FLASH FLOOD WARNING FOR...
CENTRAL WASHINGTON COUNTY IN UTAH
* UNTIL 845 PM MDT
* AT 540 PM MDT WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
RAIN OVER THE PINE VALLEY WILDERNESS AREA. RADAR ESTIMATES
INDICATE THAT AS MUCH AS 3 INCHES OF RAIN HAVE FALLEN IN THE
AREA SINCE 430 PM MDT.
* THE SANTA CLARA RIVER ABOVE BAKER DAM RESERVOIR AND SMALLER
STREAMS AND DRY WASHES FEEDING INTO THE UPPER REACHES OF THE
SANTA CLARA WILL BE AFFECTED
REMEMBER THAT FLASH FLOODING CAN OCCUR FAR REMOVED FROM THE
THUNDERSTORM AND HOURS AFTER THE RAIN FELL.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.
LAT...LON 3730 11382 3721 11350 3736 11352 3748 11370The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 6:53 PM MDT | Severe Thunderstorm Warning | SLC | Iron | 42 min |
| Jul 21, 2:15 PM MDT | Severe Thunderstorm Warning | SLC | San Juan | 45 min |
| Jul 21, 3:07 PM MDT | Severe Thunderstorm Warning | SLC | Kane, Washington | 38 min |
| Jul 21, 3:30 PM MDT | Flash Flood Warning | SLC | Washington | 2 hr |
| Jul 21, 4:50 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
| Jul 21, 5:10 PM MDT | Severe Thunderstorm Warning | SLC | Washington | 50 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.