Alert archive / Utah / Flash Flood Warnings in 2017
Flash Flood Warning 31, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Jul 29, 2017, 2:05 PM MDT for Washington County, Utah. It was in force for 4 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
- Jul 29, 2017, 2:05 PM MDT (20:05 UTC)
- Expired
- Jul 29, 2017, 6:00 PM MDT
- In force
- 4 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
- Flood severity
- None
County Washington County, UT
The radar
The Cedar City radar (KICX), 31 km from the middle of the area, began a volume at 20:07 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, 8.1 hours before the alert went out and 253 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
- 20 J/kg
- Mixed-layer CIN
- -343 J/kg
- Mixed-layer LCL
- 3022 m above ground
- 0-6 km bulk shear
- 7 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 117 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
535
WGUS55 KSLC 292005
FFWSLC
UTC053-300000-
/O.NEW.KSLC.FF.W.0031.170729T2005Z-170730T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
205 PM MDT SAT JUL 29 2017
The National Weather Service in Salt Lake City has issued a
* Flash Flood Warning for...
East central Washington County in northern Utah...
* Until 600 PM MDT
* At 202 PM MDT, Doppler radar indicated a thunderstorm producing
heavy rain over Zion National Park. This heavy rain is falling in
the North Fork of the Virgin River drainage and Orderville
Canyon. Flash flooding is expected to begin shortly.
* Some locations that will experience flooding include...
Zion National Park including the Narrows on the North Fork of the
Virgin River.
LAT...LON 3741 11290 3723 11290 3721 11298 3729 11300
3738 11300
$$
PW2 follow-up statements
005
WGUS75 KSLC 292218
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
418 PM MDT SAT JUL 29 2017
UTC053-300000-
/O.CON.KSLC.FF.W.0031.000000T0000Z-170730T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington UT-
418 PM MDT SAT JUL 29 2017
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 600 PM MDT FOR
EAST CENTRAL WASHINGTON COUNTY...
At 414 PM MDT, thunderstorms have ended across the park but the
heavy runoff from these storms is likely moving down the Virgin
River towards the narrows. Flash flooding is still expected along
the Virgin River through the rest of this afternoon.
Some locations that will experience flooding include...
Zion National Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3741 11290 3723 11290 3721 11298 3729 11300
3738 11300
$$
PW354
WGUS75 KSLC 292356
FFSSLC
Flash Flood Statement
National Weather Service Salt Lake City UT
556 PM MDT SAT JUL 29 2017
UTC053-300004-
/O.EXP.KSLC.FF.W.0031.000000T0000Z-170730T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington UT-
556 PM MDT SAT JUL 29 2017
...THE FLASH FLOOD WARNING FOR EAST CENTRAL WASHINGTON COUNTY WILL
EXPIRE AT 600 PM MDT...
The heavy rain has ended in this area, however flooding is still
possible along the Virgin River as the runoff from the earlier rain
travels downstream. Please continue to use caution along the
Virgin River through this evening.
LAT...LON 3741 11290 3723 11290 3721 11298 3729 11300
3738 11300
$$
PWThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 6:07 PM MDT | Flash Flood Warning | SLC | Kane | 6 hr |
| Jul 29, 2:35 PM MDT | Flash Flood Warning | SLC | Kane | 6 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.