Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 65, NWS Salt Lake City, UT

September 11, 2012Wayne County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Sep 11, 2012, 12:27 PM MDT for Wayne County, Utah. It was in force for 4 hr. 2 reports 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: Sep 11, 2012, 12:27 PM MDT (18:27 UTC)
Expired: Sep 11, 2012, 4:15 PM MDT
In force: 4 hr
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Flood severity: None

County Wayne County, UT

The radar

The Cedar City radar (KICX), 164 km from the middle of the area, began a volume at 18:30 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
Sep 11, 2:00 PM MDT	FLASH FLOOD	Capitol Reef Np, UT	FLASH FLOODING REPORTED IN CAPITOL REEF NATIONAL PARK. WATER WAS FLOWING ACROSS THE SCENIC DRIVE, CAUSING PARK OFFICIALS TO CLOSE THE ROAD.
Sep 11, 4:00 PM MDT	FLASH FLOOD	Capitol Reef Np, UT	FLASH FLOODING WAS REPORTED ON SULPHUR CREEK IN CAPITOL REEF NATIONAL PARK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 6.5 hours before the alert went out and 254 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: 2362 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 76 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.

047 
WGUS55 KSLC 111827
FFWSLC
UTC055-112215-
/O.NEW.KSLC.FF.W.0065.120911T1827Z-120911T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1227 PM MDT TUE SEP 11 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL WAYNE COUNTY...SPECIFICALLY CAPITOL REEF NATIONAL     
  PARK AND AREAS DOWNSTREAM TO CAINEVILLE.

* UNTIL 415 PM MDT

* AT 1215 PM MDT...VISIBLE SATELLITE AND NATIONAL WEATHER            
  SERVICE DOPPLER RADAR INDICATED HEAVY RAIN FROM A THUNDERSTORM     
  OVER THE WARNED AREA.

* THE STORM PRODUCING HEAVY RAINFALL WILL REMAIN OVER THE NORTHERN
  HALF OF THE PARK. RAPID RISES TO ALL WASHES IN THIS AREA ARE       
  EXPECTED. RAPID RISES ARE ALSO EXPECTED ALONG THE FREMONT RIVER    
  DOWNSTREAM TO THE TOWN OF CAINEVILLE.

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.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

&&

LAT...LON 3843 11144 3842 11111 3833 11102 3816 11110
      3816 11133

$$

MERRILL

2 follow-up statements

899 
WGUS75 KSLC 112019
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
219 PM MDT TUE SEP 11 2012

UTC055-112215-
/O.CON.KSLC.FF.W.0065.000000T0000Z-120911T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
219 PM MDT TUE SEP 11 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR 
WESTERN WAYNE COUNTY INCLUDING CAPITOL REEF NATIONAL PARK...

AT 210 PM MDT...PARK PERSONNEL REPORTED THAT SCENIC DRIVE IN CAPITOL 
REEF NATIONAL PARK HAD BEEN CLOSED DUE TO WATER FLOWING ACROSS THE 
ROAD. CAPITOL GORGE AND GRAND WASH ALSO REMAIN CLOSED FROM EARLIER 
FLOODING. 

RAINFALL IS TAPERING OFF IN THIS AREA WATER WILL GRADUALLY RECEDE 
OVER THE NEXT COUPLE OF HOURS.

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. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN 
AROUND...DONT DROWN.

&&

LAT...LON 3843 11144 3842 11111 3833 11102 3816 11110
      3816 11133

$$

PW

838 
WGUS75 KSLC 112209
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
409 PM MDT TUE SEP 11 2012

UTC055-112216-
/O.EXP.KSLC.FF.W.0065.000000T0000Z-120911T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WAYNE UT-
409 PM MDT TUE SEP 11 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 415 PM MDT FOR WESTERN
WAYNE COUNTY...

THE FLASH FLOOD WARNING FOR PORTIONS OF CAPITOL REEF NATIONAL PARK 
IS BEING ALLOWED TO EXPIRE. RAIN HAS ENDED IN THIS AREA AND THE 
THREAT OF ADDITIONAL FLASH FLOODING IS GREATLY REDUCED. ANY WATER 
STILL FLOWING IN WASHES IN THIS AREA WILL CONTINUE TO RECEDE. 

LAT...LON 3843 11144 3842 11111 3833 11102 3816 11110
      3816 11133

$$

PW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 10, 6:08 PM MDT	Special Weather Statement	SLC	Tooele	22 min
Sep 11, 10:52 AM MDT	Areal Flood Warning	SLC	Washington	8 hr
Sep 11, 12:20 PM MDT	Areal Flood Warning	SLC	Kane	4 hr
Sep 11, 1:45 PM MDT	Flash Flood Warning	SLC	Washington	3 hr
Sep 11, 4:20 PM MDT	Flash Flood Warning	SLC	Wayne	3 hr

Nearby

Flash Flood Warnings in Utah, 2012 Every flash flood warning in 2012

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.