Flash Flood Warning 11, NWS Flagstaff, AZ

Issued

Aug 20, 2001, 2:54 PM MST (21:54 UTC)

Expired

Aug 20, 2001, 4:00 PM MST

In force

66 min

Issued by

NWS Flagstaff, AZ

Area

Whole counties; the outline is the Mesonet’s reconstruction

County Apache County, AZ

000 
WGUS55 KFGZ 202200
FFWFLG
AZC001-210000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
254 PM MST MON AUG 20 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN APACHE COUNTY IN ARIZONA

* UNTIL 500 PM MST

* AT 254 PM MST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY       
  HEAVY RAIN OVER SOUTHEASTERN APACHE COUNTY ABOUT 11 MILES          
  SOUTHEAST OF LYMAN LAKE STATE PARK. THE THUNDERSTORM PRODUCING     
  THE HEAVY RAIN WAS NEARLY STATIONARY.

* DOPPLER RADAR INDICATES OVER 4 INCHES OF RAIN HAS FALLEN IN THE    
  AREA SOUTHEAST OF LYMAN LAKE. FLASH FLOODING WILL AFFECT LOWER     
  COYOTE CREEK FROM OLD HIGHWAY 60 TO LYMAN LAKE...AND THE SMALLER   
  CREEKS THAT RUN FROM LOCKHART ROAD WESTWARD INTO LYMAN LAKE. THE   
  TEP ACCESS ROAD WILL BE IMPACTED BY FLASH FLOODING.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND 
ARROYOS..

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. 
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. 

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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. 
MOVE TO HIGHER GROUND.

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

LAT...LON 3428 10926 3426 10914 3439 10911 3439 10923

NWS Flagstaff, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 20, 2:30 PM MST, 24 minutes earlier.

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST MON AUG 20 2001

.SYNOPSIS...SCATTERED EVENING SHOWERS AND THUNDERSTORMS WILL
DECREASE BY MIDNIGHT AS DRIER AIR MOVES INTO THE STATE. EXPECT
SCATTERED SHOWERS AND THUNDERSTORMS TO AGAIN DEVELOP BY TUESDAY
AFTERNOON...ALTHOUGH ACTIVITY WILL NOT BE AS WIDESPREAD AS TODAY.
DRIER AIR WILL CONTINUE TO MOVE INTO THE STATE THROUGH THE WEEK.
MOSTLY SUNNY SKIES AND WARMER TEMPERATURES ARE EXPECTED BY
WEDNESDAY...LASTING INTO THE COMING WEEKEND.

.DISCUSSION...NO REAL CHANGES FROM THE MORNING THINKING. WEAKENING
S/WV STILL MOVING EAST THROUGH NORTH-CENTRAL ARIZONA THIS AFTERNOON.
DECENT CONVECTION HAS BEEN BLOOMING ALL DAY AHEAD OF THIS WAVE IN
THE DEEPER MOISTURE AND DYNAMICS. SOME SUBSIDENCE AND COOLER
BOUNDARY LAYER AIR BEHIND THIS WAVE CAUSED CONVECTION TO DIE OFF
FROM FLG WESTWARD. HOWEVER...ENOUGH INSOLATION AND REMAINING
MOISTURE HAS CAUSED CONVECTION TO FINALLY BEGIN DEVELOPING OFF
TERRAIN IN THE WESTERN ZONES. THINK CONVECTION WILL LAST INTO THE
EVENING TO THE EAST...DYING OFF BY MIDNIGHT. CONVECTION TO THE WEST
WILL BE QUITE DIURNAL...LIKELY NOT MAKING IT MUCH PAST SUNSET. MOST
OF THE STORMS ARE MOVING RAPIDLY AND ARE NOT PUTTING DOWN TREMENDOUS
AMOUNTS OF RAIN...THE FFA FOR THE REGION WILL BE CANCELED WITH THE
AFTERNOON PACKAGE BARRING ANY MAJOR CHANGES. DRIER WESTERLY FLOW
WILL BEGIN TO WORK IN BEHIND THIS WAVE INTO TUESDAY. A LONGER-WAVE
TROUGH WILL MOVE THROUGH THE SAGGING WESTERLIES LATE IN THE
DAY...WITH ANOTHER ROUND OF DYNAMICS DUE OVER NORTHERN ARIZONA.
ENOUGH MOISTURE WILL REMAIN FOR SCATTERED AFTERNOON AND EARLY
EVENING ACTIVITY...ESPECIALLY OVER THE MOISTER EASTERN ZONES. THE
DRYING BEHIND THIS LAST WAVE ON TUESDAY WILL BE SIGNIFICANT...AND
ASIDE FROM ISOLATED POPS WEDNESDAY OVER THE HIGHER TERRAIN...EXPECT
NO ACTIVITY INTO THE EXTENDED. WITH LESS CLOUD COVER AND DRIER
AIR...ALSO EXPECT A WARMING TREND IN THE EXTENDED...DESPITE THE
LOWER HGHTS. PETERSON.

.FGZ...NONE.

Flash Flood Warnings in Arizona, 2001Every flash flood warning in 2001

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.