Flash Flood Warning 60, NWS Grand Junction, CO

Issued

Jul 24, 2002, 12:28 AM MDT (06:28 UTC)

Expired

Jul 24, 2002, 1:45 AM MDT

In force

77 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), 187 km from the middle of the area, began a volume at 06:28 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 240629
FFWGJT
COC067-240745-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
1228 AM MDT WED JUL 24 2002

THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A

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

* EXTENDED UNTIL 145 AM MDT

* AT 1230 AM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED A BAND OF
  MODERATE TO HEAVY RAIN TO THE NORTH AND NORTHWEST OF THE WARNING
  AREA...MOVING SOUTHEAST AT ABOUT 15 MPH.

* THIS BAND OF SHOWERS AND THUNDERSTORMS WILL LIKELY MOVE INTO
  THE WARNING AREA BEFORE 100 AM MDT. 

* OTHER LOCATIONS IN THE WARNING INCLUDE HERMOSA...LEMON AND
  VALLECITO RESERVOIRS.

ADDITIONAL FLASH FLOODING AND MUD SLIDES WERE REPORTED BY LAW 
ENFORCEMENT AT SEVERAL LOCATIONS IN THE MISSIONARY RIDGE BURN AREA 
AROUND MIDNIGHT.

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. IMMEDIATELY MOVE TO HIGHER GROUND TO ESCAPE FLOOD WATERS. 

TO REPORT FLOODING...PLEASE CONTACT THE NATIONAL WEATHER SERVICE OR 
REQUEST THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR REPORT TO 
THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN GRAND JUNCTION.

LAT...LON 3751 10793 3729 10791 3726 10753 3751 10751

582 
RWUS32 KGJT 240733
FFSGJT
COC067-240800-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
132 AM MDT WED JUL 24 2002

...FLASH FLOOD WARNING FOR CENTRAL LA PLATA COUNTY HAS BEEN
CANCELLED...

SHOWERS AND THUNDERSTORMS EXPECTED TO MOVE INTO CENTRAL LA PLATA
COUNTY IN SOUTHWEST COLORADO HAVE WEAKENED. ANY ADDITIONAL RAINFALL
TONIGHT WILL BE LIGHT. THEREFORE...THE FLASH FLOOD WARNING FOR
CENTRAL LA PLATA COUNTY HAS BEEN CANCELLED.

TAL

NWS Grand Junction, CO wrote its last area forecast discussion before this flash flood warning went out at Jul 23, 1:42 PM MDT, 10 hours 46 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.