Flash Flood Warning 12, NWS Salt Lake City, UT

Issued

Jul 14, 1999, 10:55 PM MDT (04:55 UTC)

Expired

Jul 15, 1999, 2:00 AM MDT

In force

3 hr

Issued by

NWS Salt Lake City, UT

Area

Whole counties; the outline is the Mesonet’s reconstruction

County Emery County, UT

000 
TTAA00 KSLC 150507
FFWSLC
UTC015-150800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
1055 PM MDT WED JUL 14 1999

THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN EMERY COUNTY IN UTAH
  THIS INCLUDES THE CITY OF GREEN RIVER

* UNTIL 200 AM MDT

* AT 1048 PM MDT...THE PUBLIC REPORTED FLASH FLOODING IN THE TOWN OF 
GREEN RIVER...ALONG I-70 FROM GREEN RIVER TO 20 MILES WEST OF GREEN 
RIVER IN THE SAN RAFAEL REEF SECTION...AND IN THE BUCKHORN DRAW AREA 
OF THE SAN RAFAEL SWELL. 

EXCESSIVE RUNOFF FROM STORMS EARLIER THIS EVENING HAVE CAUSED FLASH 
FLOODING OF SMALL CREEKS AND STREAMS AND HIGHWAYS AND UNDERPASSES IN 
AND AROUND GREEN RIVER.  ADDITIONALLY...MUDSLIDES AND ROCKSLIDES 
HAVE CAUSED PROBLEMS ON I-70 AND STATE ROUTE 24 IN THE REEF 
REGION...AS WELL AS IN THE BUCKHORN DRAW IN THE NORTH PORTION OF THE 
SWELL. SOME ROADS HAVE BECOME IMPASSABLE DUE TO WASHOUTS AND MUDSLIDES IN 
THE SWELL REGION. 

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED ACT
QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY
IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.  CAMPERS 
SHOULD AVOID CAMPING ALONG STREAMS OR CREEKS TONIGHT.

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. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SALT LAKE CITY.

LAT...LON 3929 11069 3916 11085 3874 11058 3881 11016
          3921 11017

NWS Salt Lake City, UT wrote its last area forecast discussion before this flash flood warning went out at Jul 14, 8:45 PM MDT, 2 hours 10 minutes earlier.

UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SALT LAKE CITY UTAH
845 PM MDT WED JUL 14 1999

SYNOPSIS...A MOIST AND UNSTABLE AIRMASS CONTINUES TO SUPPORT
SCATTERED SHOWERS AND THUNDERSTORMS ACROSS UTAH THIS EVENING.
DRIER AIR WILL MOVE INTO NORTHWEST UTAH EARLY THURSDAY BEHIND A
WEAK COLD FRONT.  SOUTHERN UTAH WILL REMAIN UNDER THE THREAT OF
THUNDERSTORMS THURSDAY BUT DRIER AIR IS EXPECTED IN THE SOUTHWEST ON
FRIDAY.

DISCUSSION...EXTENDED FLASH FLOOD WATCH UNTIL MIDNIGHT. UPDATED
ZONES FOR THIS AND TO CONTINUE SHOWERS AFTER MIDNIGHT SOME AREAS
BASED ON CURRENT RADAR AND UPSTREAM WEATHER. RECEIVING REPORTS OF .5
TO .8 INCHES OF RAIN IN 15 MINUTES WITH STORMS THIS EVENING. STORMS
ALSO MOVING OVER AREAS THAT GOT SOAKED THIS AFTERNOON. CURRENTLY
HAVE A WARNING OUT IN EMERY COUNTY AND HAVE REPORTS OF ROCKS ON I-70
IN THE SAN RAFAEL SWELL DUE TO HEAVY RAIN. SOUTHERN UTAH IN DEEP
SUB-TROPICAL MOISTURE. STORMS ARE MOVING ALONG FAST ENOUGH...BUT
TERRAIN KEEPS INITIATING CELLS IN THE SAME AREAS.

OVER NORTHERN UTAH...18Z ETA HAS A GOOD HANDLE ON VORT ADVECTION
DYNAMICS OCCURRING NOW AHEAD OF TROUGH ALOFT OVER NORTHERN NEVADA.
BAND OF SHOWERS DEVELOPED WITHIN THIS PVA AND AN AREA OF WARM
ADVECTION. WAA ALONG WEST SIDE OF RAIN COOLED AIR COVERING UTAH.
WEDGE OF WARM AIR IS BETWEEN THIS COOLER AIR AND ADVANCING COLD
FRONT JUST ENTERING NORTHWEST CORNER OF THE STATE...INITIATING NEW
THUNDERSTORMS THERE. DEW POINTS DROPPING RAPIDLY NORTH OF THIS FRONT
AND THIS DRIER AIR WILL MOVE INTO NORTHERN UTAH AND SURROUNDING
PORTIONS OF CWFA AFTER MIDNIGHT.

SLC 3112  CDC 8334  GIBSON

.SLC...FLASH FLOOD WATCH UNTIL MIDNIGHT MOST OF CWFA EXCEPT NW AND
SW CORNERS.

Flash Flood Warnings in Utah, 1999Every flash flood warning in 1999

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.