Alert archive / Utah / Flash Flood Warnings in 2013

Flash Flood Warning 21, NWS Salt Lake City, UT

July 18, 2013Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 18, 2013, 3:32 PM MDT for Kane County, Utah. It was in force for 6 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 18, 2013, 3:32 PM MDT (21:32 UTC)
Expired: Jul 18, 2013, 9:30 PM MDT
In force: 6 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), 82 km from the middle of the area, began a volume at 21:33 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 220 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: 58 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 1449 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

931 
WGUS55 KSLC 182132
FFWSLC
UTC025-190330-
/O.NEW.KSLC.FF.W.0021.130718T2132Z-130719T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
332 PM MDT THU JUL 18 2013

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL KANE COUNTY IN UTAH

* UNTIL 930 PM MDT

* AT 332 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  HEAVY RAIN FROM A THUNDERSTORM OVER THE BUCKSKIN WASH.

  INTENSE RAINFALL HAS OCCURRED OVER THE UPPER HEADWATERS OF BUCKSKIN
  GULCH...AND STORMS WILL CONTINUE TO MOVE DOWNSTREAM OVER THE       
  NEXT FEW HOURS. NATIONAL WEATHER DOPPLER RADAR ESTIMATES           
  MANY AREAS IN THE HEADWATERS HAVE SEEN IN EXCESS OF 1.5 INCHES     
  OF RAINFALL OVER THE LAST HOUR. STORM MOTION MOVING SOUTH DOWN     
  THE DRAINAGE IS EXPECTED TO ENHANCE THE FLOOD WAVE AS              
  ADDITIONAL RAINFALL OCCURS. THIS IS A LONG RUNNING FLASH FLOOD AND 
  WILL TAKE MANY HOURS TO TRACK THROUGH THE DRAINAGE BEFORE          
  FLOWS DECREASE LATER THIS EVENING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

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 3739 11232 3745 11219 3740 11206 3725 11209
      3705 11197 3703 11188 3700 11186 3700 11189
      3699 11207 3720 11223

$$

MERRILL

2 follow-up statements

715 
WGUS75 KSLC 190028
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
628 PM MDT THU JUL 18 2013

UTC025-190330-
/O.CON.KSLC.FF.W.0021.000000T0000Z-130719T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
628 PM MDT THU JUL 18 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM MDT FOR 
CENTRAL KANE COUNTY...SPECIFICALLY THE BUCKSKIN GULCH AREA...

AT 613 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR ESTIMATED 
STORM TOTALS OF 1.5 TO 2 INCHES OF RAIN FELL WITHIN AN HOUR FROM 
EARLIER THUNDERSTORMS. RAINFALL ORIGINATING FROM THESE THUNDERSTORMS 
HAS SINCE DIMINISHED...BUT THESE AMOUNTS WILL CREATE A LONG RUNNING 
FLASH FLOOD AND WILL TAKE MANY HOURS TO TRACK THROUGH THE DRAINAGE 
BEFORE FLOWS DECREASE LATER THIS EVENING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

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 3739 11232 3745 11219 3740 11206 3725 11209
      3705 11197 3703 11188 3700 11186 3700 11189
      3699 11207 3720 11223

$$

VERZELLA

516 
WGUS75 KSLC 190328
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
928 PM MDT THU JUL 18 2013

UTC025-190333-
/O.EXP.KSLC.FF.W.0021.000000T0000Z-130719T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
928 PM MDT THU JUL 18 2013

...THE FLASH FLOOD WARNING WILL EXPIRE AT 930 PM MDT FOR CENTRAL KANE
COUNTY...SPECIFICALLY THE BUCKSKIN GULCH AREA...

RUNOFF FROM EARLIER PRECIPITATION HAS DIMINISHED AND FLOWS ALONG THE 
BUCKSKIN GULCH WILL DECREASE THROUGH THE REMAINDER OF THE EVENING. 
THEREFORE...THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. 
MONITOR NOAA WEATHER RADIO OR LOCAL TELEVISION OR RADIO FOR THE 
LATEST WEATHER INFORMATION.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

LAT...LON 3739 11232 3745 11219 3740 11206 3725 11209
      3705 11197 3703 11188 3700 11186 3700 11189
      3699 11207 3720 11223

$$

LC

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 17, 6:36 PM MDT	Areal Flood Advisory	SLC	Wasatch	54 min
Jul 18, 2:04 PM MDT	Flash Flood Warning	SLC	Emery	3 hr
Jul 18, 2:08 PM MDT	Flash Flood Warning	SLC	Kane	6 hr
Jul 18, 2:23 PM MDT	Flash Flood Warning	SLC	Kane, San Juan	3 hr
Jul 18, 2:41 PM MDT	Flash Flood Warning	SLC	Carbon, Emery	3 hr
Jul 18, 3:12 PM MDT	Flash Flood Warning	SLC	Kane	3 hr
Jul 18, 4:33 PM MDT	Flash Flood Warning	SLC	Wayne	3 hr

Nearby

Flash Flood Warnings in Utah, 2013 Every flash flood warning in 2013

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.