Alert archive / Utah / Flash Flood Warnings in 2017
Flash Flood Warning 39, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 6, 2017, 3:24 PM MDT for Iron 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 as issued.
The facts
- Issued
- Aug 6, 2017, 3:24 PM MDT (21:24 UTC)
- Expired
- Aug 6, 2017, 6:15 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Iron County, UT
The radar
The Cedar City radar (KICX), 19 km from the middle of the area, began a volume at 21:27 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
Las Vegas, NV (KVEF), launched 12:00Z, 9.4 hours before the alert went out and 286 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
- 55 J/kg
- Mixed-layer CIN
- -277 J/kg
- Mixed-layer LCL
- 2035 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
646
WGUS55 KSLC 062124
FFWSLC
UTC021-070015-
/O.NEW.KSLC.FF.W.0039.170806T2124Z-170807T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
324 PM MDT SUN AUG 6 2017
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
East central Iron County in southern Utah...
* Until 615 PM MDT
* At 322 PM MDT, Doppler radar indicated a thunderstorm producing
heavy rain over the western Brian Head burnscar specifically the
Parowan Creek drainage. Up to one inch of rain has already fallen.
Flash flooding has already caused the closure of SR-143 in this
area.
* Excessive rainfall over the Brian Head burn scar will result in
debris flow moving through the Parowan Creek drainage, including
SR-143. The debris flow can consist of rock, mud, vegetation and
other loose materials.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If a debris flow has occurred it is important to realize that the
runout area remains very dangerous. Additional debris flows may occur
within minutes of the original flow. Please remain vigilant and be
prepared to take swift action.
&&
LAT...LON 3769 11282 3769 11287 3784 11285 3783 11277
3780 11277
$$
NC2 follow-up statements
831
WGUS75 KSLC 062301
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
501 PM MDT SUN AUG 6 2017
UTC021-070015-
/O.CON.KSLC.FF.W.0039.000000T0000Z-170807T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
501 PM MDT SUN AUG 6 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR
EAST CENTRAL IRON COUNTY...
As of 459 PM MDT, Doppler radar has indicated that up to 2 inches of
rain has fallen over portions of the warned area. This rainfall has
already resulted in flooding over SR-143 in the Parowan Creek
drainage and additional flooding may be possible.
Some locations that will experience flooding include...
Parowan and Brian Head.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If a debris flow has occurred it is important to realize that the
runout area remains very dangerous. Additional debris flows may occur
within minutes of the original flow. Please remain vigilant and be
prepared to take swift action.
&&
LAT...LON 3769 11282 3769 11287 3784 11285 3783 11277
3780 11277
$$
NC674
WGUS75 KSLC 070013
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
613 PM MDT SUN AUG 6 2017
UTC021-070017-
/O.EXP.KSLC.FF.W.0039.000000T0000Z-170807T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Iron UT-
613 PM MDT SUN AUG 6 2017
...THE FLASH FLOOD WARNING FOR EAST CENTRAL IRON COUNTY WILL EXPIRE
AT 615 PM MDT...
Rainfall intensity has diminished sufficiently over the warned area
to allow the warning to expire. Although some additional rainfall is
possible this evening and some locally dry washes may still contain
running water, flooding is no longer expected to pose a threat.
Please continue to heed any remaining road closures.
LAT...LON 3769 11282 3769 11287 3784 11285 3783 11277
3780 11277
$$
NCThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 6:18 PM MDT | Flash Flood Warning | SLC | Iron | 3 hr |
| Aug 5, 7:24 PM MDT | Flash Flood Warning | SLC | Kane | 5 hr |
Nearby
Flash Flood Warnings in Utah, 2017Every flash flood warning in 2017
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.