Alert archive / Utah / Flash Flood Warnings in 2012

Flash Flood Warning 1, NWS Salt Lake City, UT

July 6, 2012Washington County, Utah

NWS Salt Lake City, UT issued this flash flood warning at Jul 6, 2012, 1:26 PM MDT for Washington 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 6, 2012, 1:26 PM MDT (19:26 UTC)
Expired
Jul 6, 2012, 4:30 PM MDT
In force
3 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), 34 km from the middle of the area, began a volume at 19:29 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

TimeReportWhereRemark
Jul 6, 1:30 PM MDTFLASH FLOOD6 Ssw Zion Np Narrows, UTFLASH FLOOD REPORTED ALONG THE LEFT FORK OF NORTH CREEK IN ZION NATIONAL PARK. THIS INCLUDES SUBWAY, A VERY POPULAR HIKE.

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

The nearest sounding before it

Las Vegas, NV (KVEF), launched 12:00Z, 7.4 hours before the alert went out and 244 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-pSkew-T log-p diagram, Las Vegas, NV at 12:00Z on 2012-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2012-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
3189 m above ground
0-6 km bulk shear
4 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
-41 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.

707 
WGUS55 KSLC 061926
FFWSLC
UTC053-062230-
/O.NEW.KSLC.FF.W.0001.120706T1926Z-120706T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
126 PM MDT FRI JUL 6 2012

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH CREEK IN ZION NATIONAL PARK IN EAST CENTRAL WASHINGTON 
COUNTY IN UTAH

* UNTIL 430 PM MDT

* AT 120 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
HEAVY RAIN FROM A THUNDERSTORM OVER NORTH CREEK IN ZION NATIONAL 
PARK. THIS INCLUDES THE POPULAR SUBWAY HIKE IN NORTH CREEK. 

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3731 11302 3728 11307 3727 11310 3729 11310
      3734 11313 3738 11309 3739 11304 3736 11299

$$

HOSENFELD
2 follow-up statements
783 
WGUS75 KSLC 062213
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
413 PM MDT FRI JUL 6 2012

UTC053-062230-
/O.CON.KSLC.FF.W.0001.000000T0000Z-120706T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
413 PM MDT FRI JUL 6 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM MDT FOR 
NORTH CREEK IN ZION NATIONAL PARK EAST CENTRAL WASHINGTON COUNTY...

AT 412 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT RAIN HAS MOVED OUT OF THE AREA...BUT THE THREAT OF FLASH 
FLOODING STILL REMAINS.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3731 11302 3728 11307 3727 11310 3729 11310
      3734 11313 3738 11309 3739 11304 3736 11299

$$

HOSENFELD
934 
WGUS75 KSLC 062222
FFSSLC

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
422 PM MDT FRI JUL 6 2012

UTC053-062232-
/O.EXP.KSLC.FF.W.0001.000000T0000Z-120706T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON UT-
422 PM MDT FRI JUL 6 2012

...THE FLASH FLOOD WARNING WILL EXPIRE AT 430 PM MDT FOR NORTH CREEK 
IN ZION NATIONAL PARK IN EAST CENTRAL WASHINGTON COUNTY...

RAINFALL HAS DIMINISHED OVER THE NORTH CREEK AREA. THEREFORE... THE 
FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE. MONITOR NOAA WEATHER 
RADIO OR LOCAL TELEVISION OR RADIO FOR THE LATEST WEATHER 
INFORMATION.

LAT...LON 3731 11302 3728 11307 3727 11310 3729 11310
      3734 11313 3738 11309 3739 11304 3736 11299

$$

HOSENFELD

Nearby

Flash Flood Warnings in Utah, 2012Every 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.