Flash Flood Warning 12, NWS Grand Junction, CO

Issued

Jul 23, 2002, 9:45 PM MDT (03:45 UTC)

Expired

Jul 23, 2002, 11:30 PM MDT

In force

105 min

Issued by

NWS Grand Junction, CO

Area

Counties, with a storm outline in the text

County La Plata County, CO

The Grand Junction radar (KGJX), 188 km from the middle of the area, began a volume at 03:44 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.

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WGUS55 KGJT 240345
FFWGJT
COC067-240530-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
944 PM MDT TUE JUL 23 2002

THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LA PLATA COUNTY IN SOUTHWEST COLORADO

* UNTIL 1130 PM MDT

* AT 944 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED HEAVY RAIN 
  MOVING SOUTH INTO THE NORTHERN PART OF THE MISSIONARY RIDGE BURN   
  AREA...FOLLOWED BY ADDITIONAL AREAS OF MODERATE TO HEAVY RAIN.

* THE SHOWERS AND THUNDERSTORMS MOVING INTO THE AREA WILL BE MOVING
  SOUTHWARD AT ABOUT 15 MPH AND SHOULD CONTINUE TRACKING ACROSS THE
  AREA THROUGH 1130 PM MDT

* LOCATIONS IN THE WARNING INCLUDE VALLECITO AND LEMON RESERVOIRS

LAW ENFORCEMENT HAS ALREADY REPORTED FLASH FLOODING AND MUD SLIDES 
IN THE WARNING AREA. ADDITIONAL RAINFALL WILL RESULT IN MORE MUD AND 
DEBRIS SLIDES...AS WELL AS FLASH FLOODING OF SMALL CREEKS...STREAMS 
...AND ROADS.

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 IMMEDIATELY UP TO HIGHER GROUND TO ESCAPE 
FLOOD WATERS AND MUD SLIDES. DO NOT DRIVE YOUR VEHICLE INTO AREAS 
WHERE THE WATER OR MUD COVERS THE ROADWAY.

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

LAT...LON 3752 10779 3728 10787 3726 10753 3751 10751

NWS Grand Junction, CO wrote its last area forecast discussion before this flash flood warning went out at Jul 23, 1:42 PM MDT, 8 hours 3 minutes earlier.

WESTERN COLORADO & EASTERN UTAH AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
142 PM MDT TUE JUL 23 2002

PW DECREASED OVERNIGHT...MAINLY FROM THE MID AND UPPER LEVELS...WITH
SFC DEW PTS REMAINING HIGH...IN THE LOWER 50S SOUTH OF GJT AND CNY
AND THE MID 40S TO THE NORTH. A SHORTWAVE TROF IS SKIMMING THROUGH
DAGGETT COUNTY UT AND WILL CONTINUE PRODUCING THUNDERSTORMS THROUGH
THE EARLY EVENING. NO ORGANIZED DYNAMICS ELSEWHERE IN THE CWA TO
PULL THE CONVECTION OFF THE MOUNTAINS...WITH BEST CONCENTRATION
CLOSE TO THE EASTERN CWA BORDER/CONT DVD.

HIGH CONTINUES OVER CO WED WITH MOST OF THE ACTIVITY SEEMING TO BE
FORCES SOUTH AND WEST...ALONG WITH LESS MOISTURE...SO WED SHOULD SEE
LESS ACTIVITY. ON THURS THE AVN WANTS TO BRING A TROF THRU THE RIDGE
AND INTO THE NORTHERN HALF OF THE AREA. SINCE THE MODELS SHOWS THIS
FEATURE IN OTHER FIELDS BESIDES VORTICITY IT DOESNT LOOK LIKE
CONVECTIVE FEEDBACK...THOUGH IT STILL APPEARS TOO STRONG. WILL KEEP
THE UPTURN IN POPS IN CURRENT ZONES.  CJC

...EXTENDED (FRI-TUES)
WEAK TROF MOVES INTO GREAT BASIN REGION WITH FLAT RIDGE OVER CWA.
WITH RESIDUAL SOUTHERLY FLOW OF MOISTURE HAVE KEPT CHANCE POPS OVER
MTNS WITH SLIGHT CHANCE OVER LOWER ELEVATIONS ON FRIDAY. AS TROF
MOVES EAST OF AREA ON MONDAY PATTERN SHIFTS TO MORE WESTERLY
WITH JET NORTH OF CWA. MODELS STILL DEPICTING SOME SOUTHERLY MOIST
FLOW SO HAVE KEEP SLIGHT CHANCE POPS ACROSS MTNS AND SOUTH THROUGH
THE EXTENDED. TEMPS LOOK GOOD. MPM

.GJT...NONE.

Flash Flood Warnings in Colorado, 2002Every flash flood warning in 2002

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; radar from the NEXRAD Level II archive.