Alert archive / Utah / Flash Flood Warnings in 2017
Flash Flood Warning 37, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 5, 2017, 6:18 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 5, 2017, 6:18 PM MDT (00:18 UTC)
- Expired
- Aug 5, 2017, 9:15 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 00:18 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 00:00Z, 0.3 hours before the alert went out and 285 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
- 635 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 2674 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted.
233
WGUS55 KSLC 060018
FFWSLC
UTC021-060315-
/O.NEW.KSLC.FF.W.0037.170806T0018Z-170806T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
618 PM MDT SAT AUG 5 2017
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Southeastern Iron County in southern Utah...
* Until 915 PM MDT
* At 615 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 is expected to begin shortly.
* 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 3781 11285 3781 11280 3768 11281 3768 11288
$$
NC1 follow-up statement
952 WGUS75 KSLC 060149 FFSSLC Flash Flood Statement National Weather Service Salt Lake City UT 749 PM MDT SAT AUG 5 2017 UTC021-060315- /O.CON.KSLC.FF.W.0037.000000T0000Z-170806T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Iron UT- 749 PM MDT SAT AUG 5 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MDT FOR SOUTHEASTERN IRON COUNTY... At 744 PM MDT, Doppler radar indicated that the thunderstorms producing heavy rain have moved out of the warned area. However the warning remains in effect due to the fact that flash flooding may be ongoing as a result 1-2 inches of rain that have previously fallen on the area. Some locations that will experience flooding include... Parowan Creek, the southwestern part of the Brian Head burn scar, and parts of SR-143. PRECAUTIONARY/PREPAREDNESS ACTIONS... If a debris flow has occurred it is important to realize that the runout area remains very dangerous. Additional debris flows may occur within minutes of the original flow. Please remain vigilant and be prepared to take swift action. && LAT...LON 3781 11285 3781 11280 3768 11281 3768 11288 $$ NC
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 5, 7:24 PM MDT | Flash Flood Warning | SLC | Kane | 5 hr |
| Aug 6, 3:24 PM MDT | Flash Flood Warning | SLC | Iron | 3 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.