Flash Flood Warning 3, NWS Boise, ID

Issued

Jun 23, 2002, 2:25 PM PDT (21:25 UTC)

Expired

Jun 23, 2002, 3:20 PM PDT

In force

55 min

Issued by

NWS Boise, ID

Area

Counties, with a storm outline in the text

Counties Baker County, OR, Malheur County, OR

The Boise radar (KCBX), 159 km from the middle of the area, began a volume at 21:26 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 KBOI 232125
FFWBOI
ORC001-045-232200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE BOISE ID
224 PM PDT SUN JUN 23 2002

THE NATIONAL WEATHER SERVICE IN BOISE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL BAKER COUNTY IN NORTHEAST OREGON
  EXTREME NORTH CENTRAL MALHEUR COUNTY IN SOUTHEAST OREGON

* UNTIL 320 PM PDT(400 PM MDT)

* AT 216 PM PDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
  RAIN 7 MILES EAST OF MALHEUR CITY...OR ABOUT 26 MILES SOUTHEAST OF
  BAKER...MOVING EAST AT 15 MPH.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...
RURAL SOUTHERN BAKER COUNTY AT 240 PM PDT
RURAL SOUTHEASTERN BAKER COUNTY AT 250 PM PDT

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
BOISE.

LAT...LON 4446 11787 4435 11754 4447 11726 4465 11785

NWS Boise, ID wrote its last area forecast discussion before this flash flood warning went out at Jun 23, 1:55 PM PDT, 30 minutes earlier.

SOUTHWEST IDAHO/SOUTHEAST OREGON AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE IDAHO
300 PM MDT SUN JUNE 23 2002

THIS AFTERNOONS ISOLATED TO SCATTERED MOUNTAIN THUNDERSTORMS ARE THE
RESULT OF A MOIST AIR MASS AND DIURNAL HEATING INDUCED INSTABILITY
CAUSING MODERATE TO HIGH CAPE VALUES. ONLY WEAK DYNAMICS ALOFT SO
CELLS ARE PULSE TYPE ERUPTING OVER FAVORED OROGRAPHIC REGIONS. THIS
ACTIVITY WILL QUICKLY DIE WITH THE SUN THIS EVENING.

SHORT TERM...LIGHT SOUTHWEST FLOW ALOFT OVER FORECAST AREA FOR THE
NEXT FEW DAYS  WITH INCREASING TEMPERATURES. AIR MASS REMAINS RATHER
MOIST WITH PRECIPITABLE WATER EXPECTED TO BE IN THE 0.5 TO 0.7 INCH
RANGE THROUGH TUESDAY AT LEAST. ENOUGH MOISTURE TO WORK WITH
AFTERNOON HEATING INDUCED INSTABILITY FOR CONVECTIVE DEVELOPMENT
OVER THE MOUNTAINS AND HIGHLANDS EACH AFTERNOON AND EVENING. ON
MONDAY EVENING A WEAK TRANSIENT DISTURBANCE VISIBLE ON THE WATER
VAPOR LOOP OFF CENTRAL CALIFORNIA MAY MAINTAIN SOME SOUTHWEST
HIGHLANDS CELLS LONG ENOUGH FOR THEM TO WANDER OVER THE TREASURE AND
MAGIC VALLEYS SO WILL ADD A SLIGHT CHANCE THREAT HERE MONDAY
EVENING. OTHERWISE LOTS OF SUN AND TEMPERATURES GETTING DOWNRIGHT
HOT. AVN MODEL SEEMS TO GRASP CURRENT SITUATION WELL AND WILL USE
THIS AS MAIN GUIDANCE. BY WEDNESDAY THE INTERMOUNTAIN WEST RIDGE
PUMPS UP FOR PROBABLY THE WARMEST TEMPERATURES OF THE WEEK, LIKELY
SOME TRIPLE DIGIT VALLEY HIGH TEMPERATURES.

EXTENDED...SSMI PRECIPITABLE WATER PRODUCT SHOWS A VERY MOIST AIR
MASS OVER THE PACIFIC. WHILE THE MAIN RIDGE OVER THE INTERMOUNTAIN
WEST WILL GENERALLY CAUSE THIS MOISTURE TO RIDE OVER THE TOP TO THE
NORTH OF THE FORECAST AREA, BY THURSDAY A DEEP FETCH OF MOISTURE
FEEDS INTO OREGON WHILE A STRONGER DISTURBANCE NEAR VANCOUVER ISLE
TRIES TO BREAK DOWN THE RIDGE OVER IDAHO. THIS ARGUES FOR SLIGHTLY
COOLER HIGHS ON THURSDAY AND FRIDAY WITH A RETURN OF MOUNTAIN
THUNDERSTORMS BY FRIDAY IN THE NORTHERN MOUNTAINS AND EASTERN
OREGON ZONES.

WHILE THE OLD AND NEW MRF MODELS ARE IN GOOD AGREEMENT FOR THURSDAY
AND FRIDAY OUTLINED ABOVE, BY SATURDAY THE MODELS DIVERGE AS THE NEW
RUN SEVERELY WEAKENS THE OLD RUNS INTERMOUNTAIN UPPER LEVEL HIGH AND
MOVES THE NEXT PACIFIC TROUGH ONTO THE COAST FASTER. THE RUN TO RUN
CHANGE IS SO DRAMATIC THAT CONFIDENCE IS LOW FOR DAYS 6 AND 7 UNTIL
MORE CONSISTENCY IS OBSERVED. WILL GO WITH CONTINUED ABOVE NORMAL
TEMPERATURES WITH CHANCE OF MOUNTAIN THUNDERSTORMS OVER THE EASTERN
OREGON ZONES, OTHERWISE DRY AND CONTINUED VERY WARM THROUGH THE
WEEKEND. /FUGAZZI

.BOI...NONE.

Flash Flood Warnings in Oregon, 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.