Alert archive / Utah / Flash Flood Warnings in 2017
Flash Flood Warning 20, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 25, 2017, 1:34 PM MDT for Kane County, Utah. It was in force for 4 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
- Jul 25, 2017, 1:34 PM MDT (19:34 UTC)
- Expired
- Jul 25, 2017, 5:30 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Kane County, UT
The radar
The Cedar City radar (KICX), 116 km from the middle of the area, began a volume at 19:37 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 |
|---|---|---|---|
| Jul 25, 3:30 PM MDT | FLASH FLOOD | Big Water, UT | MINOR FLASH FLOOD IN WAHWEAP CREEK. |
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, 7.6 hours before the alert went out and 213 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
- 11 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 675 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
790
WGUS55 KSLC 251934
FFWSLC
UTC025-252330-
/O.NEW.KSLC.FF.W.0020.170725T1934Z-170725T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
134 PM MDT TUE JUL 25 2017
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
South central Kane County in southern Utah...
* Until 530 PM MDT
* At 131 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain over Wahweap Creek. Close to one inch of rain has
already fallen. Flash flooding is expected to begin shortly along
Wahweap Creek.
* Some locations that will experience flooding include...
Big Water.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3727 11172 3711 11157 3700 11139 3700 11161
3710 11184 3725 11189
$$
LC2 follow-up statements
664
WGUS75 KSLC 252141
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
341 PM MDT TUE JUL 25 2017
UTC025-252330-
/O.CON.KSLC.FF.W.0020.000000T0000Z-170725T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
341 PM MDT TUE JUL 25 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 530 PM MDT FOR
SOUTH CENTRAL KANE COUNTY...
At 339 PM MDT, Doppler radar indicated up to one inch of rain has
already fallen along the Wahweap Creek drainage. This is likely
resulting in flash flooding along Wahweap Creek.
Some locations that will experience flooding include...
Big Water.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, and other low lying spots.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3727 11172 3711 11157 3700 11139 3700 11161
3710 11184 3725 11189
$$
LC673
WGUS75 KSLC 252325
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
525 PM MDT TUE JUL 25 2017
UTC025-252333-
/O.EXP.KSLC.FF.W.0020.000000T0000Z-170725T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
525 PM MDT TUE JUL 25 2017
...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL KANE COUNTY WILL EXPIRE
AT 530 PM MDT...
The heavy rain has ended over Wahweap Creek. Flooding is no longer
expected to pose a threat. However, high flows may remain in place
along Wahweap Creek as flood waters gradually recede. Please
remain vigilant if you are traveling through this area this evening.
LAT...LON 3727 11172 3711 11157 3700 11139 3700 11161
3710 11184 3725 11189
$$
LCThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 24, 9:35 PM MDT | Flash Flood Warning | SLC | Washington | 3 hr |
| Jul 25, 6:36 AM MDT | Areal Flood Advisory | SLC | Washington | 3 hr |
| Jul 25, 9:43 AM MDT | Areal Flood Advisory | SLC | Washington | 2 hr |
| Jul 25, 12:51 PM MDT | Flash Flood Warning | SLC | Kane | 4 hr |
| Jul 25, 2:54 PM MDT | Flash Flood Warning | SLC | Garfield | 4 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.