Alert archive / Wyoming / Flash Flood Watches in 2011
Flash Flood Watch 2, NWS Riverton, WY
NWS Riverton, WY issued this flash flood watch at Jun 8, 2011, 3:32 AM MDT for 7 counties in Wyoming. It took effect at Jun 8, 2011, 3:00 PM MDT. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Jun 8, 2011, 3:32 AM MDT (09:32 UTC)
- In effect from
- Jun 8, 2011, 3:00 PM MDT
- Expired
- Jun 9, 2011, 6:00 AM MDT
- In force
- 15 hr
- Issued by
- NWS Riverton, WY
- Flood severity
- None
Counties Big Horn County, WY, Fremont County, WY, Hot Springs County, WY, Johnson County, WY, Natrona County, WY, Park County, WY, Washakie County, WY
The radar
The Riverton/Lander radar (KRIW), 93 km from the middle of the area, began a volume at 09:34 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.
The nearest sounding before it
Riverton, WY (KRIW), launched 00:00Z, 9.5 hours before the alert went out and 90 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2717 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
648 WGUS65 KRIW 080932 FFARIW URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE RIVERTON WY 332 AM MDT WED JUN 8 2011 ...FLASH FLOODING POSSIBLE ACROSS JOHNSON COUNTY LATE THIS AFTERNOON AND TONIGHT... ...INCREASED UPSTREAM RESERVOIR RELEASES WILL KEEP THE NORTH PLATTE RIVER AT CASPER AT VERY HIGH LEVELS THROUGH AT LEAST NEXT TUESDAY... .FLASH FLOODING DUE TO EXCESSIVE RAINFALL IS POSSIBLE THIS AFTERNOON AND EVENING AS UPSLOPE FLOW ALONG THE EAST SLOPES OF THE BIGHORN MOUNTAINS INITIATE THUNDERSTORMS THAT COULD MOVE OVER THE SAME AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. RESERVOIR RELEASES FROM GREY REEF RESERVOIR ARE FORECASTED TO INCREASE TO NEAR 8000 CUBIC FEET PER SECOND (CFS) THIS MORNING. THIS INCREASE IN THE NORTH PLATTE RIVER FLOW WILL REACH THE CASPER AREA THIS AFTERNOON. THE NORTH PLATTE RIVER IS THEN EXPECTED TO INCREASE ANOTHER 200 CFS BY NOON THURSDAY. THE NORTH PLATTE RIVER FLOWS ARE EXPECTED TO FLUCTUATE AROUND 8200 CFS THROUGH EARLY NEXT WEEK. AFTERNOON THUNDERSTORMS ARE POSSIBLE IN THE CASPER AREA TODAY WHICH MAY TEMPORARILY ADD TO THE RIVER FLOW IN THE CASPER AREA.. WYZ009>011-090000- /O.NEW.KRIW.FF.A.0002.110608T2100Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- INCLUDING THE CITIES OF...BUFFALO...KAYCEE 332 AM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH IN EFFECT FROM THIS AFTERNOON THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * FLASH FLOOD WATCH FOR A PORTION OF NORTH CENTRAL WYOMING... INCLUDING THE FOLLOWING AREAS...BIGHORN MOUNTAINS SOUTHEAST... AND THE LOWER ELEVATIONS OF JOHNSON COUNTY. * FROM THIS AFTERNOON THROUGH LATE TONIGHT * EXCESSIVE RAINFALL IS POSSIBLE THIS AFTERNOON AND EVENING AS UPSLOPE FLOW ALONG THE EAST SLOPES OF THE BIGHORN MOUNTAINS INITIATE THUNDERSTORMS THAT TRAIN OVER AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ020-090000- /O.CON.KRIW.FA.A.0007.110608T1800Z-110614T1800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NATRONA COUNTY LOWER ELEVATIONS- INCLUDING THE CITY OF...CASPER 332 AM MDT WED JUN 8 2011 ...FLOOD WATCH REMAINS IN EFFECT FROM NOON MDT TODAY THROUGH TUESDAY MORNING... THE FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA... NATRONA COUNTY LOWER ELEVATIONS. * FROM NOON MDT TODAY THROUGH TUESDAY MORNING * RESERVOIR RELEASES FROM GREY REEF RESERVOIR ARE FORECASTED TO INCREASE TO NEAR 8000 CUBIC FEET PER SECOND (CFS) THIS MORNING. THIS INCREASE IN THE NORTH PLATTE RIVER FLOW WILL REACH THE CASPER AREA THIS AFTERNOON. THE NORTH PLATTE RIVER IS THEN EXPECTED TO INCREASE ANOTHER 200 CFS BY NOON THURSDAY. THE NORTH PLATTE RIVER FLOWS ARE EXPECTED TO FLUCTUATE AROUND 8200 CFS THROUGH EARLY NEXT WEEK. * LOW LAND FLOODING IN CASPER...ESPECIALLY AROUND THE NORTH PLATTE RIVER PARKWAY...IS EXPECTED TO INCREASE AND BECOME MORE WIDESPREAD WITH THE INCREASED RIVER FLOWS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$
5 follow-up statements
188 WGUS65 KRIW 081949 FFARIW FLOOD WATCH NATIONAL WEATHER SERVICE RIVERTON WY 149 PM MDT WED JUN 8 2011 ...FLASH FLOODING POSSIBLE ACROSS JOHNSON COUNTY LATE THIS AFTERNOON AND TONIGHT... ...INCREASED UPSTREAM RESERVOIR RELEASES WILL KEEP THE NORTH PLATTE RIVER AT CASPER AT VERY HIGH LEVELS THROUGH AT LEAST NEXT TUESDAY... WYZ009>011-091200- /O.CON.KRIW.FF.A.0002.110608T2100Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- INCLUDING THE CITIES OF...BUFFALO...KAYCEE 149 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF NORTH CENTRAL WYOMING...INCLUDING THE FOLLOWING AREAS...BIGHORN MOUNTAINS SOUTHEAST...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY. * THROUGH LATE TONIGHT * EXCESSIVE RAINFALL IS POSSIBLE LATE THIS AFTERNOON THROUGH TONIGHT AS UPSLOPE FLOW ALONG THE EAST SLOPES OF THE BIGHORN MOUNTAINS INITIATE THUNDERSTORMS THAT TRAIN OVER AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. THE HIGHEST LIKELIHOOD FOR THUNDERSTORMS WILL BE THIS EVENING AND OVERNIGHT. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ020-091200- /O.CON.KRIW.FA.A.0007.000000T0000Z-110614T1800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NATRONA COUNTY LOWER ELEVATIONS- INCLUDING THE CITY OF...CASPER 149 PM MDT WED JUN 8 2011 ...FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING... THE FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA... NATRONA COUNTY LOWER ELEVATIONS. * THROUGH TUESDAY MORNING * RESERVOIR RELEASES FROM GREY REEF RESERVOIR ARE RUNNING AT 8300 CUBIC FEET PER SECOND (CFS) THIS AFTERNOON. THE NORTH PLATTE RIVER IS THEN EXPECTED TO INCREASE ANOTHER 200 CFS BY NOON THURSDAY. THE NORTH PLATTE RIVER FLOWS ARE EXPECTED TO FLUCTUATE AROUND 8500 CFS THROUGH EARLY NEXT WEEK. THE NORTH PLATTE RIVER IN CASPER WAS REPORTING A GAGE HEIGHT AROUND 7.6 FEET THIS AFTERNOON. FLOOD STAGE IS AROUND 8 FEET. * LOW LAND FLOODING IN CASPER...ESPECIALLY AROUND THE NORTH PLATTE RIVER PARKWAY...IS EXPECTED TO INCREASE AND BECOME MORE WIDESPREAD WITH THE INCREASED RIVER FLOWS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ TEAM RIVERTON
254 WGUS65 KRIW 082135 FFARIW URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE RIVERTON WY 335 PM MDT WED JUN 8 2011 ...FLASH FLOODING POSSIBLE ACROSS MUCH OF NORTH CENTRAL WYOMING THROUGH TONIGHT... ...INCREASED UPSTREAM RESERVOIR RELEASES WILL KEEP THE NORTH PLATTE RIVER AT CASPER AT VERY HIGH LEVELS THROUGH AT LEAST NEXT TUESDAY... WYZ008-091200- /O.EXA.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS WEST- 335 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE A PORTION OF NORTH CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA...BIGHORN MOUNTAINS WEST. * THROUGH LATE TONIGHT * EXCESSIVE RAINFALL IS POSSIBLE LATE THIS AFTERNOON THROUGH TONIGHT AS THUNDERSTORMS FORM ALONG THE WEST SLOPE OF THE BIGHORN MOUNTAINS. STORMS MAY MOVE OVER THE SAME AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. THE HIGHEST LIKELIHOOD FOR THUNDERSTORMS WILL BE THIS EVENING AND OVERNIGHT. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ002>007-091200- /O.EXA.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ABSAROKA MOUNTAINS-CODY FOOTHILLS-NORTH BIG HORN BASIN- SOUTHWEST BIG HORN BASIN-SOUTHEAST BIG HORN BASIN- OWL CREEK AND BRIDGER MOUNTAINS- INCLUDING THE CITIES OF...CODY...MEETEETSE...POWELL...LOVELL... GREYBULL...BASIN...THERMOPOLIS...WORLAND 335 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE PORTIONS OF CENTRAL WYOMING... NORTH CENTRAL WYOMING AND NORTHWEST WYOMING...INCLUDING THE FOLLOWING AREAS...IN CENTRAL WYOMING...OWL CREEK AND BRIDGER MOUNTAINS AND SOUTHWEST BIG HORN BASIN. IN NORTH CENTRAL WYOMING...SOUTHEAST BIG HORN BASIN. IN NORTHWEST WYOMING... ABSAROKA MOUNTAINS...CODY FOOTHILLS AND NORTH BIG HORN BASIN. * THROUGH LATE TONIGHT * * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ016-091200- /O.EXA.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ UPPER WIND RIVER BASIN- INCLUDING THE CITY OF...DUBOIS 335 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE A PORTION OF CENTRAL WYOMING... INCLUDING THE FOLLOWING AREA...UPPER WIND RIVER BASIN. * THROUGH LATE TONIGHT * STRONG THUNDERSTORMS THROUGH TONIGHT WILL CREATE THE POSSIBILITY FOR FLASH FLOODING ACROSS THE AREA. THE RISK ALSO EXISTS FOR MULTIPLE STORMS TO MOVE OVER THE SAME AREA. THE STRONGEST STORMS HAVE THE POSSIBILITY TO PRODUCE A QUICK INCH OF RAIN IN UNDER AN HOUR WITH LOCALLY HIGHER AMOUNTS. THIS EXCESSIVE RAINFALL WOULD ADD TO THE POTENTIAL FOR FLOODING ALONG THE UPPER REACHES OF THE WIND RIVER AND OTHER AREA STREAMS AND CREEKS. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ009>011-091200- /O.CON.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- INCLUDING THE CITIES OF...BUFFALO...KAYCEE 335 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF NORTH CENTRAL WYOMING...INCLUDING THE FOLLOWING AREAS...BIGHORN MOUNTAINS SOUTHEAST...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY. * THROUGH LATE TONIGHT * EXCESSIVE RAINFALL IS POSSIBLE LATE THIS AFTERNOON THROUGH TONIGHT AS UPSLOPE FLOW ALONG THE EAST SLOPES OF THE BIGHORN MOUNTAINS INITIATE THUNDERSTORMS THAT TRAIN OVER AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. THE HIGHEST LIKELIHOOD FOR THUNDERSTORMS WILL BE THIS EVENING AND OVERNIGHT. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ020-091200- /O.CON.KRIW.FA.A.0007.000000T0000Z-110614T1800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NATRONA COUNTY LOWER ELEVATIONS- INCLUDING THE CITY OF...CASPER 335 PM MDT WED JUN 8 2011 ...FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING... THE FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA... NATRONA COUNTY LOWER ELEVATIONS. * THROUGH TUESDAY MORNING * RESERVOIR RELEASES FROM GREY REEF RESERVOIR ARE RUNNING AT 8300 CUBIC FEET PER SECOND (CFS) THIS AFTERNOON. THE NORTH PLATTE RIVER IS THEN EXPECTED TO INCREASE ANOTHER 200 CFS BY NOON THURSDAY. THE NORTH PLATTE RIVER FLOWS ARE EXPECTED TO FLUCTUATE AROUND 8500 CFS THROUGH EARLY NEXT WEEK. THE NORTH PLATTE RIVER IN CASPER WAS REPORTING A GAGE HEIGHT AROUND 7.6 FEET THIS AFTERNOON. FLOOD STAGE IS AROUND 8 FEET. * LOW LAND FLOODING IN CASPER...ESPECIALLY AROUND THE NORTH PLATTE RIVER PARKWAY...IS EXPECTED TO INCREASE AND BECOME MORE WIDESPREAD WITH THE INCREASED RIVER FLOWS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ TEAM RIVERTON
901 WGUS65 KRIW 082210 CCA FFARIW URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH...CORRECTED NATIONAL WEATHER SERVICE RIVERTON WY 408 PM MDT WED JUN 8 2011 ...FLASH FLOODING POSSIBLE ACROSS MUCH OF NORTH CENTRAL WYOMING THROUGH TONIGHT... ...INCREASED UPSTREAM RESERVOIR RELEASES WILL KEEP THE NORTH PLATTE RIVER AT CASPER AT VERY HIGH LEVELS THROUGH AT LEAST NEXT TUESDAY... WYZ008-091200- /O.EXA.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS WEST- 408 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE A PORTION OF NORTH CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA...BIGHORN MOUNTAINS WEST. * THROUGH LATE TONIGHT * EXCESSIVE RAINFALL IS POSSIBLE LATE THIS AFTERNOON THROUGH TONIGHT AS THUNDERSTORMS FORM ALONG THE WEST SLOPE OF THE BIGHORN MOUNTAINS. STORMS MAY MOVE OVER THE SAME AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. THE HIGHEST LIKELIHOOD FOR THUNDERSTORMS WILL BE THIS EVENING AND OVERNIGHT. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ002>007-091200- /O.COR.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ABSAROKA MOUNTAINS-CODY FOOTHILLS-NORTH BIG HORN BASIN- SOUTHWEST BIG HORN BASIN-SOUTHEAST BIG HORN BASIN- OWL CREEK AND BRIDGER MOUNTAINS- INCLUDING THE CITIES OF...CODY...MEETEETSE...POWELL...LOVELL... GREYBULL...BASIN...THERMOPOLIS...WORLAND 408 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE PORTIONS OF CENTRAL WYOMING... NORTH CENTRAL WYOMING AND NORTHWEST WYOMING...INCLUDING THE FOLLOWING AREAS...IN CENTRAL WYOMING...OWL CREEK AND BRIDGER MOUNTAINS AND SOUTHWEST BIG HORN BASIN. IN NORTH CENTRAL WYOMING...SOUTHEAST BIG HORN BASIN. IN NORTHWEST WYOMING... ABSAROKA MOUNTAINS...CODY FOOTHILLS AND NORTH BIG HORN BASIN. * THROUGH LATE TONIGHT * STRONG THUNDERSTORMS THROUGH TONIGHT WILL CREATE THE POSSIBILITY FOR FLASH FLOODING ACROSS THE AREA. THE RISK ALSO EXISTS FOR MULTIPLE STORMS TO MOVE OVER THE SAME AREA. THE STRONGEST STORMS HAVE THE POSSIBILITY TO PRODUCE A QUICK INCH OF RAIN IN UNDER AN HOUR WITH LOCALLY HIGHER AMOUNTS. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ016-091200- /O.EXA.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ UPPER WIND RIVER BASIN- INCLUDING THE CITY OF...DUBOIS 408 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH IN EFFECT THROUGH LATE TONIGHT... THE NATIONAL WEATHER SERVICE IN RIVERTON HAS EXPANDED THE * FLASH FLOOD WATCH TO INCLUDE A PORTION OF CENTRAL WYOMING... INCLUDING THE FOLLOWING AREA...UPPER WIND RIVER BASIN. * THROUGH LATE TONIGHT * STRONG THUNDERSTORMS THROUGH TONIGHT WILL CREATE THE POSSIBILITY FOR FLASH FLOODING ACROSS THE AREA. THE RISK ALSO EXISTS FOR MULTIPLE STORMS TO MOVE OVER THE SAME AREA. THE STRONGEST STORMS HAVE THE POSSIBILITY TO PRODUCE A QUICK INCH OF RAIN IN UNDER AN HOUR WITH LOCALLY HIGHER AMOUNTS. THIS EXCESSIVE RAINFALL WOULD ADD TO THE POTENTIAL FOR FLOODING ALONG THE UPPER REACHES OF THE WIND RIVER AND OTHER AREA STREAMS AND CREEKS. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ009>011-091200- /O.CON.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY- SOUTHEAST JOHNSON COUNTY- INCLUDING THE CITIES OF...BUFFALO...KAYCEE 408 PM MDT WED JUN 8 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF NORTH CENTRAL WYOMING...INCLUDING THE FOLLOWING AREAS...BIGHORN MOUNTAINS SOUTHEAST...NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY. * THROUGH LATE TONIGHT * EXCESSIVE RAINFALL IS POSSIBLE LATE THIS AFTERNOON THROUGH TONIGHT AS UPSLOPE FLOW ALONG THE EAST SLOPES OF THE BIGHORN MOUNTAINS INITIATE THUNDERSTORMS THAT TRAIN OVER AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. THE HIGHEST LIKELIHOOD FOR THUNDERSTORMS WILL BE THIS EVENING AND OVERNIGHT. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ020-091245- /O.CON.KRIW.FA.A.0007.000000T0000Z-110614T1800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NATRONA COUNTY LOWER ELEVATIONS- INCLUDING THE CITY OF...CASPER 408 PM MDT WED JUN 8 2011 ...FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING... THE FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA... NATRONA COUNTY LOWER ELEVATIONS. * THROUGH TUESDAY MORNING * RESERVOIR RELEASES FROM GREY REEF RESERVOIR ARE RUNNING AT 8300 CUBIC FEET PER SECOND (CFS) THIS AFTERNOON. THE NORTH PLATTE RIVER IS THEN EXPECTED TO INCREASE ANOTHER 200 CFS BY NOON THURSDAY. THE NORTH PLATTE RIVER FLOWS ARE EXPECTED TO FLUCTUATE AROUND 8500 CFS THROUGH EARLY NEXT WEEK. THE NORTH PLATTE RIVER IN CASPER WAS REPORTING A GAGE HEIGHT AROUND 7.6 FEET THIS AFTERNOON. FLOOD STAGE IS AROUND 8 FEET. * LOW LAND FLOODING IN CASPER...ESPECIALLY AROUND THE NORTH PLATTE RIVER PARKWAY...IS EXPECTED TO INCREASE AND BECOME MORE WIDESPREAD WITH THE INCREASED RIVER FLOWS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ TEAM RIVERTON
488 WGUS65 KRIW 090810 FFARIW FLOOD WATCH NATIONAL WEATHER SERVICE RIVERTON WY 210 AM MDT THU JUN 9 2011 ...FLASH FLOODING POSSIBLE ACROSS MUCH OF NORTH CENTRAL WYOMING THROUGH EARLY THIS MORNING... ...INCREASED UPSTREAM RESERVOIR RELEASES WILL KEEP THE NORTH PLATTE RIVER AT CASPER AT VERY HIGH LEVELS THROUGH AT LEAST NEXT TUESDAY... WYZ008>011-091200- /O.CON.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST- NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY- INCLUDING THE CITIES OF...BUFFALO...KAYCEE 210 AM MDT THU JUN 9 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 6 AM MDT EARLY THIS MORNING... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF NORTH CENTRAL WYOMING...INCLUDING THE FOLLOWING AREAS...BIGHORN MOUNTAINS SOUTHEAST...BIGHORN MOUNTAINS WEST... NORTHEAST JOHNSON COUNTY AND SOUTHEAST JOHNSON COUNTY. * UNTIL 6 AM MDT EARLY THIS MORNING * EXCESSIVE RAINFALL IS POSSIBLE LATE THROUGH EARLY MORNING AS THUNDERSTORMS FORM ALONG THE WEST SLOPE OF THE BIGHORN MOUNTAINS. STORMS MAY MOVE OVER THE SAME AREAS THAT HAVE ELEVATED STREAMFLOW DUE TO RECENT SNOWMELT. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ002>007-091200- /O.CON.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ABSAROKA MOUNTAINS-CODY FOOTHILLS-NORTH BIG HORN BASIN- SOUTHWEST BIG HORN BASIN-SOUTHEAST BIG HORN BASIN- OWL CREEK AND BRIDGER MOUNTAINS- INCLUDING THE CITIES OF...CODY...MEETEETSE...POWELL...LOVELL... GREYBULL...BASIN...THERMOPOLIS...WORLAND 210 AM MDT THU JUN 9 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 6 AM MDT EARLY THIS MORNING... THE FLASH FLOOD WATCH CONTINUES FOR * PORTIONS OF CENTRAL WYOMING...NORTH CENTRAL WYOMING AND NORTHWEST WYOMING...INCLUDING THE FOLLOWING AREAS...IN CENTRAL WYOMING...OWL CREEK AND BRIDGER MOUNTAINS AND SOUTHWEST BIG HORN BASIN. IN NORTH CENTRAL WYOMING...SOUTHEAST BIG HORN BASIN. IN NORTHWEST WYOMING...ABSAROKA MOUNTAINS...CODY FOOTHILLS AND NORTH BIG HORN BASIN. * UNTIL 6 AM MDT EARLY THIS MORNING * THUNDERSTORMS WITH HEAVY RAIN ARE POSSIBLE THROUGH EARLY THIS MORNING AND WILL CREATE THE POSSIBILITY FOR FLASH FLOODING ACROSS THE AREA. THE RISK ALSO EXISTS FOR MULTIPLE STORMS TO MOVE OVER THE SAME AREA. THE STRONGEST STORMS HAVE THE POSSIBILITY TO PRODUCE A QUICK INCH OF RAIN IN UNDER AN HOUR WITH LOCALLY HIGHER AMOUNTS. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ016-091200- /O.CON.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ UPPER WIND RIVER BASIN- INCLUDING THE CITY OF...DUBOIS 210 AM MDT THU JUN 9 2011 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 6 AM MDT EARLY THIS MORNING... THE FLASH FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA... UPPER WIND RIVER BASIN. * UNTIL 6 AM MDT EARLY THIS MORNING * THUNDERSTORMS WITH HEAVY RAIN THROUGH EARLY THIS MORNING WILL CREATE THE POSSIBILITY FOR FLASH FLOODING ACROSS THE AREA. THE RISK ALSO EXISTS FOR MULTIPLE STORMS TO MOVE OVER THE SAME AREA. THE STRONGEST STORMS HAVE THE POSSIBILITY TO PRODUCE A QUICK INCH OF RAIN IN UNDER AN HOUR WITH LOCALLY HIGHER AMOUNTS. THIS EXCESSIVE RAINFALL WOULD ADD TO THE POTENTIAL FOR FLOODING ALONG THE UPPER REACHES OF THE WIND RIVER AND OTHER AREA STREAMS AND CREEKS. * LOCAL CREEKS AND STREAMS MAY SEE RAPID RISES IN RESPONSE TO EXCESSIVE RUNOFF FROM HEAVY THUNDERSTORM RAIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED. && $$ WYZ020-091615- /O.CON.KRIW.FA.A.0007.000000T0000Z-110614T1800Z/ /00000.0.RS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NATRONA COUNTY LOWER ELEVATIONS- INCLUDING THE CITY OF...CASPER 210 AM MDT THU JUN 9 2011 ...FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING... THE FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA... NATRONA COUNTY LOWER ELEVATIONS. * THROUGH TUESDAY MORNING * RESERVOIR RELEASES FROM GREY REEF RESERVOIR ARE RUNNING AT 8300 CUBIC FEET PER SECOND (CFS) THIS AFTERNOON. THE NORTH PLATTE RIVER IS THEN EXPECTED TO INCREASE ANOTHER 200 CFS BY NOON THURSDAY. THE NORTH PLATTE RIVER FLOWS ARE EXPECTED TO FLUCTUATE AROUND 8500 CFS THROUGH EARLY NEXT WEEK. THE NORTH PLATTE RIVER IN CASPER WAS REPORTING A GAGE HEIGHT AROUND 7.6 FEET THIS AFTERNOON. FLOOD STAGE IS AROUND 8 FEET. * LOW LAND FLOODING IN CASPER...ESPECIALLY AROUND THE NORTH PLATTE RIVER PARKWAY...IS EXPECTED TO INCREASE AND BECOME MORE WIDESPREAD WITH THE INCREASED RIVER FLOWS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$
968 WGUS65 KRIW 091141 FFARIW FLOOD WATCH NATIONAL WEATHER SERVICE RIVERTON WY 541 AM MDT THU JUN 9 2011 ...INCREASED UPSTREAM RESERVOIR RELEASES WILL KEEP THE NORTH PLATTE RIVER AT CASPER AT VERY HIGH LEVELS THROUGH AT LEAST NEXT TUESDAY... WYZ008>011-091245- /O.EXP.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.SM.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST- NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY- INCLUDING THE CITIES OF...BUFFALO...KAYCEE 541 AM MDT THU JUN 9 2011 ...FLASH FLOOD WATCH WILL EXPIRE AT 6 AM MDT EARLY THIS MORNING... THE FLASH FLOOD WATCH ACROSS NORTH CENTRAL WYOMING WILL BE ALLOWED TO EXPIRE AT 6 AM MDT EARLY THIS MORNING. $$ WYZ002>007-091245- /O.EXP.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.SM.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ABSAROKA MOUNTAINS-CODY FOOTHILLS-NORTH BIG HORN BASIN- SOUTHWEST BIG HORN BASIN-SOUTHEAST BIG HORN BASIN- OWL CREEK AND BRIDGER MOUNTAINS- INCLUDING THE CITIES OF...CODY...MEETEETSE...POWELL...LOVELL... GREYBULL...BASIN...THERMOPOLIS...WORLAND 541 AM MDT THU JUN 9 2011 ...FLASH FLOOD WATCH WILL EXPIRE AT 6 AM MDT EARLY THIS MORNING... THE FLASH FLOOD WATCH ACROSS NORTH CENTRAL WYOMING WILL BE ALLOWED TO EXPIRE AT 6 AM MDT EARLY THIS MORNING. $$ WYZ016-091245- /O.EXP.KRIW.FF.A.0002.000000T0000Z-110609T1200Z/ /00000.0.SM.000000T0000Z.000000T0000Z.000000T0000Z.OO/ UPPER WIND RIVER BASIN- INCLUDING THE CITY OF...DUBOIS 541 AM MDT THU JUN 9 2011 ...FLASH FLOOD WATCH WILL EXPIRE AT 6 AM MDT EARLY THIS MORNING... THE FLASH FLOOD WATCH FOR THE UPPER WIND RIVER BASIN WILL BE ALLOWED TO EXPIRE AT 6 AM MDT EARLY THIS MORNING. $$ WYZ020-100000- /O.CON.KRIW.FA.A.0007.000000T0000Z-110614T1800Z/ /00000.0.SM.000000T0000Z.000000T0000Z.000000T0000Z.OO/ NATRONA COUNTY LOWER ELEVATIONS- INCLUDING THE CITY OF...CASPER 541 AM MDT THU JUN 9 2011 ...FLOOD WATCH REMAINS IN EFFECT THROUGH TUESDAY MORNING... THE FLOOD WATCH CONTINUES FOR * A PORTION OF CENTRAL WYOMING...INCLUDING THE FOLLOWING AREA... NATRONA COUNTY LOWER ELEVATIONS. * THROUGH TUESDAY MORNING * RESERVOIR RELEASES FROM GREY REEF RESERVOIR ARE RUNNING AT 8300 CUBIC FEET PER SECOND (CFS) THIS MORNING. THE NORTH PLATTE RIVER IS THEN EXPECTED TO INCREASE ANOTHER 200 CFS BY NOON TODAY. THE NORTH PLATTE RIVER FLOWS ARE EXPECTED TO FLUCTUATE AROUND 8500 CFS THROUGH EARLY NEXT WEEK. THE NORTH PLATTE RIVER IN CASPER WAS REPORTING A GAGE HEIGHT AROUND 7.6 FEET EARLY THIS MORNING. FLOOD STAGE IS AROUND 8 FEET. * LOW LAND FLOODING IN CASPER...ESPECIALLY AROUND THE NORTH PLATTE RIVER PARKWAY...IS EXPECTED TO INCREASE AND BECOME MORE WIDESPREAD WITH THE INCREASED RIVER FLOWS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A FLOOD WATCH MEANS THERE IS A POTENTIAL FOR FLOODING BASED ON CURRENT FORECASTS. YOU SHOULD MONITOR LATER FORECASTS AND BE ALERT FOR POSSIBLE FLOOD WARNINGS. THOSE LIVING IN AREAS PRONE TO FLOODING SHOULD BE PREPARED TO TAKE ACTION SHOULD FLOODING DEVELOP. && $$ 21
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before this flash flood watch went out at Jun 8, 3:04 AM MDT, 28 minutes earlier.
Area forecast discussion, Jun 8, 3:04 AM MDT, 28 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 304 AM MDT WED JUN 8 2011 .SHORT TERM...TODAY THROUGH FRIDAY NIGHT SHOWERS CONTINUE OVER NORTHWEST WYOMING THIS MORNING IN THE WAKE OF AN UPPER LEVEL LOW PRESSURE SYSTEM THAT IS MOVING OFF INTO CANADA. UP TO 2 INCHES OF PRECIPITATION HAS FALLEN IN NORTHWEST TETON COUNTY AND SOUTHWEST YELLOWSTONE NATIONAL PARK. RAINFALL OF 0.50 TO 1.50 INCHES HAS FALLEN ELSEWHERE IN THE PARK. THIS HAS PROMPTED THE ISSUANCE OF AN AREAL FLOOD ADVISORY AS AREA RIVERS AND STREAMS ARE RUNNING HIGH WITH MINOR LOWLAND FLOODING POSSIBLE. ADDITIONAL RAINFALL OF 0.25 TO 0.75 INCHES IS POSSIBLE IN THIS AREA TODAY AS A CLEAR DEFORMATION ZONE HAS DEVELOPED FROM NORTHEAST NEVADA THROUGH WESTERN MONTANA IN RESPONSE TO THE EXITING UPPER LOW AND BUILDING HIGH TO THE EAST AND A STRENGTHENING UPPER LOW APPROACHING FROM THE NORTHWEST. SHOWERS AND A FEW ISOLATED THUNDERSTORMS WILL DEVELOP ELSEWHERE ACROSS WESTERN AND CENTRAL WYOMING AS DAYTIME HEATING AND RESIDUAL MOISTURE COMBINE TO PRODUCE MODERATE INSTABILITY ACROSS THE AREA. THE BEST MOISTURE WILL BE IN THE NORTHERN AND EASTERN ZONES WITH PRECIPITABLE WATER VALUES OF 0.5 TO 0.7 INCHES. SEVERAL FACTORS WILL COME TOGETHER TO PRODUCE STRONGER THUNDERSTORMS FOR JOHNSON AND NATRONA COUNTIES THIS AFTERNOON. DEVELOPING SURFACE LOW OVER SRN WY/NW CO WILL BRING EASTERLY LOW LEVEL WIND BENEATH THE LEFT EXIT REGION OF A SOUTHWESTERLY 75KT JET. THIS WILL PROVIDE SUFFICIENT DEEP LAYER SHEAR TO PRODUCE STRONG CONVECTION WITH PERHAPS A FEW SEVERE THUNDERSTORMS WITH POTENTIALLY DAMAGING WIND AND LARGE HAIL IN NATRONA AND SOUTHERN JOHNSON COUNTIES. UPSLOPE FLOW ALONG THE EASTERN SLOPS OF THE SOUTHERN BIGHORN SHOULD PRODUCE THUNDERSTORMS WITH HEAVY RAIN AS THEY MOVE OFF TO THE NORTH NORTHEAST. STORMS MAY CONTINUALLY REDEVELOP OVER THE SAME LOCATIONS AND TRAVERSE THE SAME AREAS BRINGING EXCESSIVE RAINFALL TO AREAS THAT ARE ALREADY SEEING ELEVATED STREAMFLOW DUE TO RECENT RAIN AND SNOWMELT. HAVE ISSUED A FLASH FLOOD WATCH FOR THIS AFTERNOON THROUGH THURSDAY MORNING FOR THE EAST SLOPES OF THE BIGHORNS AND ADJACENT LOWER ELEVATIONS OF JOHNSON COUNTY DUE TO THIS THREAT. MORE SHOWERS AND THUNDERSTORMS ARE ON TAP FOR THURSDAY AS AN UPPER LOW MOVES DIRECTLY OVER WYOMING. THUNDERSTORMS WILL NOT BE AS STRONG AS WEDNESDAY BUT SHOWERS IN THE WEST WILL CONTINUE THE FLOODING THREAT. A FEW LINGERING SHOWERS AND ISOLATED THUNDERSTORMS ARE POSSIBLE FRIDAY BUT DRIER CONDITIONS ARE EXPECTED ACROSS MUCH OF THE AREA AS A TRANSITORY RIDGE BUILDS TO THE WEST. .LONG TERM...SATURDAY THROUGH WEDNESDAY THROUGH THE EXTENDED...MEDIUM RANGE MODELS CONTINUE TO SHOW WEAK TROUGHINESS OVER THE WEST...AND STRONG RIDGING OVER THE SOUTH CENTRAL/SOUTHEAST STATES. WEAK SHORTWAVE TROUGHS COULD PERIODICALLY IMPACT THE FORECAST AREA DURING THE EXTENDED...BUT MEDIUM RANGE MODELS ARE HAVING A DIFFICULTY IN TIMING AND LOCATION OF THESE SYSTEMS. ONE OF THESE SYSTEMS IS PROJECTED TO IMPACT THE AREA SATURDAY/SATURDAY NIGHT. THE BEST FORCING AND MOISTURE CURRENTLY IS PROGGED TO BE NORTH OF THE AREA...WITH THE BEST SHOT AT PRECIPITATION IN THE FORECAST AREA OVER THE NORTHWEST AND NORTHERN SECTIONS. THE ASSOCIATED WEAK COLD FRONT IS EXPECTED TO MOVE ACROSS LATE SATURDAY/SATURDAY NIGHT. OTHER DISTURBANCES COULD AFFECT THE AREA SUNDAY AND MONDAY. GLOBAL MODELS ARE HINTING AT A STRONGER SYSTEM SLIDING SOUTHEAST OUT OF BRITISH COLUMBIA IMPACTING THE NORTHERN ROCKIES IN THE TUESDAY THROUGH THURSDAY TIMEFRAME NEXT WEEK. HOWEVER...LARGE DISCREPANCIES EXIST THIS FAR OUT. TEMPERATURES IN THE EXTENDED ARE EXPECTED TO GENERALLY BE SLIGHTLY BELOW AVERAGE. SOME HIGHS COULD BE AS MUCH AS 15 DEGREES BELOW AVERAGE...BUT WILL NOT GO THAT COOL YET. && .AVIATION... WEAK VORTICITY MAXIMA TRAILING MAIN UPPER LOW IN SOUTHERN MANITOBA WILL WORK EAST-NORTHEAST ACROSS THE NORTH HALF OF THE FORECAST AREA EARLY THIS MORNING. THIS WILL CONTINUE TO KEEP THREAT OF SHOWERS AND LOCALIZED MVFR CEILINGS MAINLY NORTH OF A KJAC-KGEY-KBYG LINE. OTHER LOCATIONS WILL REMAIN VFR. LOW LEVEL BOUNDARY WILL SURGE SOUTH TO A KLND-KCPR LINE AND HANG-UP ALONG HIGHER TERRAIN THIS MORNING. THIS BOUNDARY WILL SLOWLY RETREAT NORTH ON WEDNESDAY AND WILL LIKELY SERVE AS THE FOCUSING MECHANISM FOR AFTERNOON CONVECTION. MOST TERMINALS WILL HAVE AT LEAST A THREAT OF VCSH/CB BEGINNING 20Z AND CONTINUING THROUGH 03Z/THU WITH THE STRONGEST CONVECTION ALONG AND EAST OF A KSHR-KBYG-KCPR LINE. COMPLEX PATTERN SHAPES UP OVERNIGHT WITH SURFACE LOW PRESSURE FORMING OVER SOUTHERN WYOMING AS UPPER LOW DROPS INTO IDAHO. SURFACE WINDS AND BEST LOCATIONS FOR PRECIP WILL DEPEND GREATLY UPON WHERE THIS LOW FORMS. FOR NOW HAVE BROAD BRUSHED WITH VFR CONDITIONS. BEST CHANCE FOR MVFR AND MORE WIDESPREAD PRECIP WILL REMAIN OVER NORTHWEST WYOMING INCLUDING KJAC TERMINAL. && .HYDROLOGY... SNOWMELT HAS SLOWED AS COOLER TEMPERATURES HAVE SETTLED IN ACROSS THE AREA. HOWEVER...SIGNIFICANT RAINFALL HAS CAUSED RIVER RISES PARTICULARLY IN YELLOWSTONE NATIONAL PARK. AN AREAL FLOOD ADVISORY HAS BEEN ISSUED FOR THIS AREA AS ANOTHER 0.25 TO 0.75 INCHES OF RAIN MAY FALL TODAY WITH A FEW INCHES OF SNOW ABOVE 9500 FEET. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR THE EAST SLOPES OF THE BIGHORN MOUNTAINS AND ADJACENT LOVER ELEVATIONS OF JOHNSON COUNTY AS UPSLOPE FLOW AND FAVORABLE CONVECTIVE CONDITIONS MAY PRODUCE HEAVY RAIN AS THUNDERSTORMS TRAIN REPEATEDLY OVER AREAS THAT ARE ALREADY SEEING ELEVATED STREAM FLOWS. WHILE COOL CONDITIONS WILL REMAIN WITH LOW TEMPERATURES DROPPING INTO THE 20S AND LOW 30S THURSDAY NIGHT ABOVE 9000 FEET IN THE WEST...SHOWERY PRECIPITATION WILL CONTINUE THROUGH THURSDAY WITH PERHAPS A FEW SHOWERS LINGERING INTO EARLY FRIDAY. && .RIW WATCHES/WARNINGS/ADVISORIES... FLOOD WATCH FROM NOON MDT TODAY THROUGH TUESDAY MORNING WYZ020. FLASH FLOOD WATCH FROM THIS AFTERNOON THROUGH LATE TONIGHT WYZ009>011. && SHORT TERM...BERC LONG TERM...WM AVIATION...CNJ HYDROLOGY...BERC
Hazardous weather outlook, Jun 7, 9:49 PM MDT, 5 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 949 PM MDT TUE JUN 7 2011 WYZ001>020-022>030-081300- ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST- BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS- NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN- NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS- ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES- SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN- SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN- WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 949 PM MDT TUE JUN 7 2011 ...AREAL FLOOD WARNING ACROSS STAR VALLEY FOR THE SALT RIVER AND ITS TRIBUTARIES THROUGH THURSDAY AFTERNOON... ...FLOOD ADVISORY IN EFFECT FOR YELLOWSTONE NATIONAL PARK AND EXTREME NORTHWEST TETON COUNTY THROUGH WEDNESDAY EVENING... ...FLOOD WATCH FOR NATRONA COUNTY THROUGH NEXT TUESDAY MORNING... ...SEVERE THUNDERSTORMS POSSIBLE IN NATRONA COUNTY WEDNESDAY AFTERNOON AND EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TONIGHT SOME FLOODING WILL CONTINUE ALONG THE SALT RIVER AND ITS TRIBUTARIES IN THE STAR VALLEY FOR THE NEXT SEVERAL DAYS...ESPECIALLY LOW LYING AREAS. SEE THE LATEST FLOOD STATEMENT FOR FURTHER DETAILS. MODERATE RAINFALL COMBINED WITH SNOWMELT HAVE RAISED RIVER LEVELS IN YELLOWSTONE NATIONAL PARK WHERE A FLOOD ADVISORY IS IN EFFECT. ADDITIONALLY...SOME FLOOD CONCERNS REMAIN ELEVATED FOR THE LOWER ELEVATIONS OF NATRONA COUNTY. A FLOOD WATCH IS CURRENTLY IN EFFECT FOR THIS AREA...PLEASE SEE THE FLOOD WATCH STATEMENT FOR ADDITIONAL DETAILS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY STRONG TO POTENTIALLY SEVERE THUNDERSTORMS MAY DEVELOP ACROSS NATRONA COUNTY WEDNESDAY AFTERNOON AND EVENING AS MOIST SOUTHEAST FLOW MEETS A DRIER SOUTHWEST FLOW MOVING UP FROM THE RED DESERT. STRONG THUNDERSTORMS ARE ALSO POSSIBLE ACROSS WESTERN WYOMING IN ADVANCE OF THE NEXT STORM SYSTEM. THE THREAT OF THUNDERSTORMS WILL COVER MUCH OF CENTRAL AND WESTERN WYOMING WEDNESDAY THROUGH THURSDAY WITH THE POTENTIAL FOR SOME FLOODING CONCERNS DUE TO HEAVY RAIN ON THE RECORD SNOWPACK IN ISOLATED LOCATIONS. .SPOTTER INFORMATION STATEMENT... SPOTTERS...PLEASE REPORT ANY FLOODING ALONG RIVERS...CREEKS AND STREAMS. THANK YOU. TEAM RIVERTON
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 9:30 PM MDT | Areal Flood Advisory | RIW | Park, Teton | 42 hr |
| Jun 8, 2:13 PM MDT | Special Weather Statement | RIW | Big Horn | 47 min |
| Jun 8, 2:22 PM MDT | Special Weather Statement | RIW | Teton | 38 min |
| Jun 8, 2:38 PM MDT | Special Weather Statement | RIW | 52 min | |
| Jun 8, 3:22 PM MDT | Special Weather Statement | RIW | Big Horn | 38 min |
| Jun 8, 3:33 PM MDT | Special Weather Statement | RIW | Natrona | 27 min |
| Jun 8, 3:39 PM MDT | Special Weather Statement | RIW | Hot Springs | 36 min |
| Jun 8, 3:59 PM MDT | Special Weather Statement | RIW | Big Horn | 46 min |
| Jun 8, 4:22 PM MDT | Special Weather Statement | RIW | Big Horn | 38 min |
| Jun 8, 4:35 PM MDT | Special Weather Statement | RIW | Big Horn | 40 min |
| Jun 8, 4:58 PM MDT | Special Weather Statement | RIW | Big Horn | 47 min |
| Jun 8, 5:32 PM MDT | Special Weather Statement | RIW | Hot Springs | 43 min |
| Jun 8, 5:51 PM MDT | Special Weather Statement | RIW | Natrona | 39 min |
Nearby
Flash Flood Watches in Wyoming, 2011Every flash flood watch in 2011
Sources
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.