Alert archive / Utah / Flash Flood Warnings in 2018

Flash Flood Warning 55, NWS Salt Lake City, UT

August 15, 2018Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Aug 15, 2018, 3:31 PM MDT for Kane 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: Aug 15, 2018, 3:31 PM MDT (21:31 UTC)
Expired: Aug 15, 2018, 7:30 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), 66 km from the middle of the area, began a volume at 21:32 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 9.5 hours before the alert went out and 232 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1949 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

268 
WGUS55 KSLC 152131
FFWSLC
UTC025-160130-
/O.NEW.KSLC.FF.W.0055.180815T2131Z-180816T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Salt Lake City UT
331 PM MDT WED AUG 15 2018

The National Weather Service in Salt Lake City has issued a

* Flash Flood Warning for...
  Western Kane County in southern Utah...

* Until 730 PM MDT
    
* At 327 PM MDT, Doppler radar indicated a thunderstorm producing 
  heavy rain over Johnson, Deer Spring, Buckskin and House Rock 
  washes. Kanab City is expected to have issues from the heavy 
  rainfall. Flash flooding is expected to begin shortly.

* Radar estimates up to an inch of rain has fallen in these 
  drainages in a short period of time.

* Some locations that will experience flooding include...
  Kanab.

LAT...LON 3743 11208 3700 11198 3700 11257 3741 11239
      3746 11224

$$

Verzella

1 follow-up statement

896 
WGUS75 KSLC 152346
FFSSLC

Flash Flood Statement
National Weather Service Salt Lake City UT
546 PM MDT WED AUG 15 2018

UTC025-160130-
/O.CON.KSLC.FF.W.0055.000000T0000Z-180816T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kane UT-
546 PM MDT WED AUG 15 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM MDT FOR
WESTERN KANE COUNTY...

At 540 PM MDT, Doppler radar indicated thunderstorms are diminishing 
over the headwaters of the warning area. However, due to the lag 
time of the flood waters coming down the basins, the flash flood 
warning will continue until its expiration time. 

Some locations that may experience flooding include Johnson, Deer 
Spring,Buckskin and House Rock washes, and the city of Kanab.
 
LAT...LON 3743 11208 3700 11198 3700 11257 3741 11239
      3746 11224

$$

Verzella

Nearby

Flash Flood Warnings in Utah, 2018 Every flash flood warning in 2018

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.