649  
WGUS65 KPIH 030807  
FFAPIH  
 
URGENT - IMMEDIATE BROADCAST REQUESTED  
FLOOD WATCH  
NATIONAL WEATHER SERVICE POCATELLO ID  
207 AM MDT SUN SEP 3 2023  
 
IDZ051-052-055-067>075-040900-  
/O.EXA.KPIH.FA.A.0006.230903T1800Z-230904T0900Z/  
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/  
SHOSHONE/LAVA BEDS-ARCO/MUD LAKE DESERT-EASTERN MAGIC VALLEY-  
BEAVERHEAD - LEMHI HIGHLANDS-LOST RIVER VALLEY-LOST RIVER RANGE-  
CHALLIS/PAHSIMEROI VALLEYS-FRANK CHURCH WILDERNESS-  
SAWTOOTH/STANLEY BASIN-SUN VALLEY REGION-BIG LOST  
HIGHLANDS/COPPER BASIN-WOOD RIVER FOOTHILLS-  
INCLUDING THE CITIES OF SHOSHONE, RICHFIELD, CAREY, MUD LAKE,  
INL, CRATERS OF THE MOON NM, BURLEY, RUPERT, HEYBURN, OAKLEY,  
DUBOIS, SPENCER, EDIE SCHOOL, SMALL, HOWE, ARCO, MACKAY, CHILLY,  
BORAH PEAK, CHALLIS, CLAYTON, STANLEY, KETCHUM, SUN VALLEY,  
GALENA, COPPER BASIN, HAILEY, BELLEVUE, AND PICABO  
207 AM MDT SUN SEP 3 2023  
   
..FLOOD WATCH IN EFFECT FROM NOON MDT TODAY THROUGH LATE TONIGHT
 
 
* WHAT...FLASH FLOODING CAUSED BY EXCESSIVE RAINFALL CONTINUES TO BE  
POSSIBLE.  
 
* WHERE...PORTIONS OF CENTRAL, EASTERN, SOUTH CENTRAL, AND SOUTHEAST  
IDAHO, INCLUDING THE FOLLOWING AREAS, IN CENTRAL IDAHO, BIG LOST  
HIGHLANDS/COPPER BASIN, CHALLIS/PAHSIMEROI VALLEYS, FRANK CHURCH  
WILDERNESS, LOST RIVER RANGE, LOST RIVER VALLEY, SAWTOOTH/STANLEY  
BASIN, SUN VALLEY REGION AND WOOD RIVER FOOTHILLS. IN EASTERN  
IDAHO, BEAVERHEAD - LEMHI HIGHLANDS. IN SOUTH CENTRAL IDAHO,  
EASTERN MAGIC VALLEY AND SHOSHONE/LAVA BEDS. IN SOUTHEAST IDAHO,  
ARCO/MUD LAKE DESERT.  
 
* WHEN...FROM NOON MDT TODAY THROUGH LATE TONIGHT.  
 
* IMPACTS...EXCESSIVE RUNOFF MAY RESULT IN FLOODING OF RIVERS,  
CREEKS, STREAMS, AND OTHER LOW-LYING AND FLOOD-PRONE LOCATIONS.  
FLOODING MAY OCCUR IN POOR DRAINAGE AND URBAN AREAS. STORM DRAINS  
AND DITCHES MAY BECOME CLOGGED WITH DEBRIS.  
 
* ADDITIONAL DETAILS...  
- THUNDERSTORMS THIS AFTERNOON AND EVENING WILL BE CAPABLE OF  
PRODUCING VERY HEAVY RAINFALL.  
- HTTP://WWW.WEATHER.GOV/SAFETY/FLOOD  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION  
SHOULD FLASH FLOOD WARNINGS BE ISSUED.  
 

 
 

 
 
IDZ053-054-056>066-040900-  
/O.CON.KPIH.FA.A.0006.230903T1800Z-230904T0900Z/  
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/  
UPPER SNAKE RIVER PLAIN-LOWER SNAKE RIVER PLAIN-SOUTHERN  
HILLS/ALBION MOUNTAINS-RAFT RIVER REGION-MARSH AND ARBON  
HIGHLANDS-FRANKLIN/EASTERN ONEIDA REGION-BEAR RIVER RANGE-BEAR  
LAKE VALLEY-BLACKFOOT MOUNTAINS-CARIBOU RANGE-BIG HOLE MOUNTAINS-  
TETON VALLEY-CENTENNIAL MOUNTAINS - ISLAND PARK-  
INCLUDING THE CITIES OF IDAHO FALLS, REXBURG, ST. ANTHONY,  
POCATELLO, BLACKFOOT, AMERICAN FALLS, SHELLEY, FORT HALL, ALBION,  
ALMO, MALTA, ROCKLAND, HOLBROOK, INKOM, MCCAMMON, DOWNEY, LAVA  
HOT SPRINGS, MALAD, PRESTON, THATCHER, EMIGRATION SUMMIT, ST.  
CHARLES, MONTPELIER, GEORGETOWN, GRACE, SODA SPRINGS, HENRY,  
BONE, WAYAN, SWAN VALLEY, VICTOR, ASHTON, TETONIA, DRIGGS, ISLAND  
PARK, AND KILGORE  
207 AM MDT SUN SEP 3 2023  
 
...FLOOD WATCH REMAINS IN EFFECT FROM NOON MDT TODAY THROUGH LATE  
TONIGHT...  
 
* WHAT...FLASH FLOODING CAUSED BY EXCESSIVE RAINFALL CONTINUES TO BE  
POSSIBLE.  
 
* WHERE...PORTIONS OF EASTERN AND SOUTHEAST IDAHO, INCLUDING THE  
FOLLOWING AREAS, IN EASTERN IDAHO, BIG HOLE MOUNTAINS, CENTENNIAL  
MOUNTAINS - ISLAND PARK AND TETON VALLEY. IN SOUTHEAST IDAHO, BEAR  
LAKE VALLEY, BEAR RIVER RANGE, BLACKFOOT MOUNTAINS, CARIBOU RANGE,  
FRANKLIN/EASTERN ONEIDA REGION, LOWER SNAKE RIVER PLAIN, MARSH AND  
ARBON HIGHLANDS, RAFT RIVER REGION, SOUTHERN HILLS/ALBION  
MOUNTAINS AND UPPER SNAKE RIVER PLAIN.  
 
* WHEN...FROM NOON MDT TODAY THROUGH LATE TONIGHT.  
 
* IMPACTS...EXCESSIVE RUNOFF MAY RESULT IN FLOODING OF RIVERS,  
CREEKS, STREAMS, AND OTHER LOW-LYING AND FLOOD-PRONE LOCATIONS.  
FLOODING MAY OCCUR IN POOR DRAINAGE AND URBAN AREAS. STORM DRAINS  
AND DITCHES MAY BECOME CLOGGED WITH DEBRIS.  
 
* ADDITIONAL DETAILS...  
- THUNDERSTORMS THIS AFTERNOON AND EVENING WILL BE CAPABLE OF  
PRODUCING VERY HEAVY RAINFALL.  
- HTTP://WWW.WEATHER.GOV/SAFETY/FLOOD  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION  
SHOULD FLASH FLOOD WARNINGS BE ISSUED.  
 

 
 

 
 
MACKAY  
 
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