Alert archive / Utah / Flash Flood Warnings in 2017
Flash Flood Warning 36, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 5, 2017, 3:13 PM MDT for Garfield County, Iron County, Utah. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 5, 2017, 3:13 PM MDT (21:13 UTC)
- Expired
- Aug 5, 2017, 6:15 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
Counties Garfield County, UT, Iron County, UT
The radar
The Cedar City radar (KICX), 22 km from the middle of the area, began a volume at 21:16 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 5, 4:30 PM MDT | FLASH FLOOD | 11 Wnw Hatch, UT | BOULDERES ACROSS THE ROAD ALONG STATE ROUTE 143 NEAR WHITE BRIDGE CAMPGROUND IN THE PANGUITCH CREEK DRAINAGE. A FRONT LOADER WAS NEEDED TO REMOVE THE BOULDERS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.2 hours before the alert went out and 287 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
- 14 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 1168 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
773
WGUS55 KSLC 052113
FFWSLC
UTC017-021-060015-
/O.NEW.KSLC.FF.W.0036.170805T2113Z-170806T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
313 PM MDT SAT AUG 5 2017
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
Western Garfield County in southern Utah...
East central Iron County in southern Utah...
* Until 615 PM MDT
* At 311 PM MDT, Doppler radar indicated a thunderstorm producing
heavy rain over the Brian Head burnscar specifically the Panguitch
and Clear Creek drainages. Up to one inch of rain has already
fallen. Flash flooding is expected to begin shortly.
* Flash flooding will remain over mainly rural areas of western
Garfield and east central Iron Counties.
Excessive rainfall over the Brian Head burn scar will result in
debris flow moving through the Panguitch/Clear Creek drainages,
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 3768 11265 3772 11277 3777 11268 3773 11258
$$
NC2 follow-up statements
521 WGUS75 KSLC 052247 FFSSLC Flash Flood Statement National Weather Service Salt Lake City UT 447 PM MDT SAT AUG 5 2017 UTC017-021-060015- /O.CON.KSLC.FF.W.0036.000000T0000Z-170806T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Garfield UT-Iron UT- 447 PM MDT SAT AUG 5 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR WESTERN GARFIELD AND EAST CENTRAL IRON COUNTIES... As of 438 PM MDT, heavy precipitation has come to an end over the warned area however flash flooding may still be occurring due to the 2 inches of precipitation which fell over the previous 2 hours. Flash flooding will remain over mainly rural areas of western Garfield and east central Iron Counties. Excessive rainfall over the Brian Head burn scar will result in debris flow moving through the Panguitch/Clear Creek drainages, including SR-143. The debris flow can consist of rock, mud, vegetation and other loose materials. PRECAUTIONARY/PREPAREDNESS ACTIONS... If a debris flow has occurred it is important to realize that the runout area remains very dangerous. Additional debris flows may occur within minutes of the original flow. Please remain vigilant and be prepared to take swift action. && LAT...LON 3768 11265 3772 11277 3777 11268 3773 11258 $$ NC
276 WGUS75 KSLC 060011 FFSSLC Flash Flood Statement National Weather Service Salt Lake City UT 611 PM MDT SAT AUG 5 2017 UTC017-021-060017- /O.EXP.KSLC.FF.W.0036.000000T0000Z-170806T0015Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Garfield UT-Iron UT- 611 PM MDT SAT AUG 5 2017 ...THE FLASH FLOOD WARNING FOR WESTERN GARFIELD AND EAST CENTRAL IRON COUNTIES WILL EXPIRE AT 615 PM MDT... The heavy rain has ended in the eastern part of the Brian Head burn scar and flash flooding is no longer considered a threat. However, creeks and streams as well as normally dry washes will continue to see high flows through late tonight as any flood waters from earlier heavy rain gradually recede. Please continue to heed any remaining road closures. LAT...LON 3768 11265 3772 11277 3777 11268 3773 11258 $$ 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, 1:09 AM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| Aug 5, 2:51 AM MDT | Areal Flood Advisory | SLC | Washington | 114 min |
| Aug 5, 5:20 PM MDT | Special Weather Statement | SLC | Carbon | 25 min |
| Aug 5, 5:44 PM MDT | Special Weather Statement | SLC | Emery | 31 min |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.