Alert archive / Utah / Flash Flood Warnings in 2010

Flash Flood Warning 13, NWS Salt Lake City, UT

July 28, 2010Kane County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 28, 2010, 8:07 PM MDT for Kane 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: Jul 28, 2010, 8:07 PM MDT (02:07 UTC)
Expired: Jul 28, 2010, 11:00 PM MDT
In force: 3 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), 118 km from the middle of the area, began a volume at 02:09 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 28, 9:30 PM MDT	FLASH FLOOD	3 N Big Water, UT	FLASH FLOODING REPORTED IN WAHWEAP WASH AND WARM 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 00:00Z, 2.1 hours before the alert went out and 214 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: 559 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1066 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 40 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.

053 
WGUS55 KSLC 290207
FFWSLC
UTC025-290500-
/O.NEW.KSLC.FF.W.0013.100729T0207Z-100729T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
807 PM MDT WED JUL 28 2010

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

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

* UNTIL 1100 PM MDT

* AT 800 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
THUNDERSTORMS CAPABLE OF PRODUCING FLASH FLOODING NEAR BIG WATER AND 
WAHWEAP TO THE WEST OF LAKE POWELL. FLASH FLOODING IS EXPECTED ALONG 
THE WARM CREEK AND WAHWEAP CREEK DRAINAGES AND WILL REACH WAHWEAP 
AND THE UTAH/ARIZONA BORDER NEAR 930 PM.

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.

&&

LAT...LON 3727 11183 3735 11149 3701 11134 3699 11166
      3699 11173

$$

KRUSE/MCINERNEY

2 follow-up statements

769 
WGUS75 KSLC 290336
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
936 PM MDT WED JUL 28 2010

UTC025-290500-
/O.CON.KSLC.FF.W.0013.000000T0000Z-100729T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
936 PM MDT WED JUL 28 2010

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM MDT FOR
CENTRAL KANE COUNTY...

AT 930 PM MDT...THUNDERSTORM ACTIVITY HAS DECREASED OVER THE WARM 
CREEK AND WAHWEEP DRAINAGES TO THE WEST OF LAKE POWELL. 
HOWEVER...RADAR ESTIMATES THAT 1.5 TO 2 INCHES OF WATER FELL OVER 
THIS AREA EARLIER THIS EVENING...WHICH COULD CONTINUE TO CAUSE FLASH 
FLOODING AS THE WATER FLOWS DOWNSTREAM. IT IS EXPECTED THAT THE 
HIGHEST WATER LEVELS WILL BE NEARING THE UTAH/ARIZONA BORDER NEAR 
WAHWEEP AROUND 930 PM. 

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.

&&

LAT...LON 3727 11183 3735 11149 3701 11134 3699 11166
      3699 11173

$$

SCHOENING

367 
WGUS75 KSLC 290453
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1053 PM MDT WED JUL 28 2010

UTC025-290501-
/O.EXP.KSLC.FF.W.0013.000000T0000Z-100729T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KANE UT-
1053 PM MDT WED JUL 28 2010

...THE FLASH FLOOD WARNING WILL EXPIRE AT 1100 PM MDT FOR CENTRAL
KANE COUNTY...

RADAR ESTIMATES OF 1.5 TO 2 INCHES OF RAINFALL OCCURRED OVER THE 
WARM CREEK AND WAHWEEP DRAINAGES TO THE WEST OF LAKE POWELL EARLIER 
THIS EVENING. HOWEVER...RAINFALL HAS DIMINISHED...AND IT IS EXPECTED 
THAT THE FLASH FLOODING HAS WANED AND MOVED OUT OF THE AREA. WE ARE 
AWAITING VERIFICATION OF FLASH FLOOD OCCURRENCE AT THIS TIME.

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 3727 11183 3735 11149 3701 11134 3699 11166
      3699 11173

$$

SCHOENING

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 6:03 PM MDT	Special Weather Statement	SLC	Kane	42 min
Jul 28, 6:26 PM MDT	Flash Flood Warning	SLC	Kane	3 hr
Jul 28, 6:47 PM MDT	Flash Flood Warning	SLC	Kane	3 hr
Jul 28, 7:27 PM MDT	Flash Flood Warning	SLC	Kane	3 hr
Jul 29, 4:15 AM MDT	Flash Flood Watch	SLC		18 hr
Jul 29, 5:39 AM MDT	Areal Flood Advisory	SLC	Emery	4 hr
Jul 29, 3:03 PM MDT	Special Weather Statement	SLC		42 min
Jul 29, 3:57 PM MDT	Special Weather Statement	SLC	Kane	48 min
Jul 29, 4:07 PM MDT	Flash Flood Warning	SLC	Kane	3 hr

Nearby

Flash Flood Warnings in Utah, 2010 Every flash flood warning in 2010

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.