Alert archive / Nevada / River Flood Warnings in 2017
River Flood Warning 24, NWS Reno, NV
NWS Reno, NV issued this river flood warning at May 18, 2017, 12:36 PM PDT for Lyon County, Nevada. It took effect at May 21, 2017, 3:00 PM PDT. It was in force for 18 days.
The area
The outline as issued.
The facts
- Issued
- May 18, 2017, 12:36 PM PDT (19:36 UTC)
- In effect from
- May 21, 2017, 3:00 PM PDT
- Expired
- Jun 8, 2017, 3:13 AM PDT
- In force
- 18 days
- Issued by
- NWS Reno, NV
- Area
- Storm-based polygon
- Flood severity
- Moderate
County Lyon County, NV
The radar
The Reno radar (KRGX), 90 km from the middle of the area, began a volume at 19:38 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 river
Written for the forecast point Walker River near Mason - Snyder Lane (MASN2).
- Action stage
- 9 ft
- Minor stage
- 9.8 ft
- Moderate stage
- 11 ft
- Major stage
- 11.6 ft
This gauge today: stage, forecast and historic crests
Stage from the USGS instantaneous record for site 10300600, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.
The text
As transmitted.
431 WGUS45 KREV 181936 FLWREV Flood Warning National Weather Service Reno NV 1236 PM PDT Thu May 18 2017 ...The National Weather Service in Reno has issued a Flood Warning for the following rivers in Nevada... Walker River Near Mason affecting Lyon County For the Mainstem Walker River...including Mason...Moderate flooding is forecast. Rising temperatures this weekend and early next week will produce increased snowmelt in the upper part of the Walker River basin. This increased runoff will create very high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley/Yerington area to Weber Reservoir. These high flows are likely to last into June and may also cause flooding from Coleville through the Antelope and Smith Valleys along the West Walker River and along the East Walker River above Mason Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-231936- /O.NEW.KREV.FL.W.0024.170521T2200Z-000000T0000Z/ /MASN2.2.ER.170521T2200Z.170523T1100Z.000000T0000Z.UU/ 1236 PM PDT Thu May 18 2017 The National Weather Service in Reno has issued a * Flood Warning for The Walker River Near Mason. * from Sunday afternoon until further notice...Or until the warning is cancelled. * At 11:15 AM Thursday the stage was 9.4 feet. * Flood stage is 9.8 feet. * Moderate flooding is forecast. * Forecast...Rise above flood stage by Sunday afternoon and continue to rise to near 11.2 feet by early Tuesday morning. Additional rises are likely thereafter. * Impact...At 11.0 feet...Moderate flooding of lowlands...pasture and farmland adjacent to the river throughout Mason Valley-Yerington area. Minor flooding is likely along the East Walker River from above Strosnider Ditch to the confluence with the West Walker. Several rural and some secondary public roads begin to flood. Yards and basements of lowest homes adjacent to the river in Mason and Yerington begin flooding. Possible damage to irrigation structures and levees. The river is likely to be higher than the floods of summer 2011. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
18 follow-up statements
553 WGUS45 KREV 191950 FLWREV Flood Warning National Weather Service Reno NV 1250 PM PDT Fri May 19 2017 ...Forecast flooding changed from Moderate to Major severity for the following rivers in Nevada... Walker River Near Mason affecting Lyon County For the Mainstem Walker River...including Mason...Major flooding is forecast. Rising temperatures this weekend and early next week will produce increased snowmelt in the upper part of the Walker River basin. This increased runoff will create very high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley/Yerington area to Weber Reservoir. Major to near record flooding is possible through the Mason Valley. These high flows are likely to last into June and may also cause flooding from Coleville through the Antelope and Smith Valleys along the West Walker River and along the East Walker River above Mason Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-221950- /O.EXT.KREV.FL.W.0024.170522T1200Z-000000T0000Z/ /MASN2.3.ER.170522T1200Z.170524T1200Z.000000T0000Z.UU/ 1250 PM PDT Fri May 19 2017 ...Forecast flooding increased from Moderate to Major severity... The Flood Warning continues for The Walker River Near Mason. * from late Sunday night until further notice. * At 12:15 PM Friday the stage was 9.2 feet. * Flood stage is 9.8 feet. * Major flooding is forecast. * Forecast...Rise above flood stage by early Monday morning and continue to rise to near 12.1 feet by early Wednesday morning. Additional rises are possible thereafter. * Impact...At 12.0 feet...Major flooding in the Mason Valley/Yerington area. Many homes...businesses...structures... roads...bridges and well over a thousand acres of farmland and pasture near the river could become flooded. Some portions of Yerington will likely flood. Flooding could reach near record levels similar to the extent of flooding in January 1997. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
584 WGUS85 KREV 192253 FLSREV Flood Statement National Weather Service Reno NV 353 PM PDT Fri May 19 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Rising temperatures this weekend and early next week will produce increased snowmelt in the upper part of the Walker River basin. This increased runoff will create very high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley/Yerington area to Weber Reservoir. Major to near record flooding is possible through the Mason Valley. These high flows are likely to last into June and may also cause flooding from Coleville through the Antelope and Smith Valleys along the West Walker River and along the East Walker River above Mason Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-222253- /O.CON.KREV.FL.W.0024.170522T1200Z-000000T0000Z/ /MASN2.3.SM.170522T1200Z.170524T1200Z.000000T0000Z.UU/ 353 PM PDT Fri May 19 2017 The Flood Warning continues for The Walker River Near Mason. * from late Sunday night until further notice. * At 3:15 PM Friday the stage was 9.2 feet. * Flood stage is 9.8 feet. * Major flooding is forecast. * Forecast...Rise above flood stage by early Monday morning and continue to rise to near 12.1 feet by early Wednesday morning. Additional rises are possible thereafter. * Impact...At 12.0 feet...Major flooding in the Mason Valley/Yerington area. Many homes...businesses...structures... roads...bridges and well over a thousand acres of farmland and pasture near the river could become flooded. Some portions of Yerington will likely flood. Flooding could reach near record levels similar to the extent of flooding in January 1997. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
524 WGUS85 KREV 201812 FLSREV Flood Statement National Weather Service Reno NV 1112 AM PDT Sat May 20 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County For the Mainstem Walker River...including Mason...Major flooding is forecast. Rising temperatures will produce increased snowmelt in the upper part of the Walker River basin. This increased runoff will create very high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley/Yerington area to Weber Reservoir. Major to near record flooding is possible through the Mason Valley. These high flows are likely to last into June and may also cause flooding from Coleville through the Antelope and Smith Valleys along the West Walker River and along the East Walker River above Mason Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on snowmelt and temperature conditions at time of issuance. If actual conditions vary from these forecasts... river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-222012- /O.EXT.KREV.FL.W.0024.170522T2000Z-000000T0000Z/ /MASN2.3.SM.170522T2000Z.170525T1000Z.000000T0000Z.UU/ 1112 AM PDT Sat May 20 2017 The Flood Warning continues for The Walker River Near Mason. * from Monday afternoon until further notice. * At 9:15 AM Saturday the stage was 9.2 feet. * Flood stage is 9.8 feet. * Major flooding is forecast. * Forecast...Rise above flood stage by early Monday afternoon and continue to rise to near 12.9 feet by early Thursday morning. Additional rises are expected thereafter. * Impact...Major flooding in the Mason Valley-Yerington area. Well over a thousand acres of farmland and pasture could become flooded... as well as some portions of Yerington. Flows are forecast to be higher than 1983 and 1986...at about 3300 CFS...by Wednesday evening. HOWEVER... IT IS IMPOSSIBLE TO FORECAST WHETHER THE RIVER WILL BREACH through the channel in Mason Valley. IF THE RIVER BREACHES...IT COULD CAUSE MUCH MORE SIGNIFICANT IMPACTS...INCLUDING IMPACTS FOR MUCH OF YERINGTON. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
013 WGUS85 KREV 211922 FLSREV Flood Statement National Weather Service Reno NV 1222 PM PDT Sun May 21 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County For the Mainstem Walker River...including Mason...Major flooding is forecast. Rising temperatures will produce increased snowmelt in the upper part of the Walker River basin. This increased runoff will create very high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley/Yerington area to Weber Reservoir. Major to near record flooding is possible through the Mason Valley. These high flows are likely to last into June and may also cause flooding from Coleville through the Antelope and Smith Valleys along the West Walker River and along the East Walker River above Mason Valley. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on snowmelt and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-241922- /O.EXT.KREV.FL.W.0024.170523T1100Z-000000T0000Z/ /MASN2.3.SM.170523T1100Z.170526T1200Z.000000T0000Z.UU/ 1222 PM PDT Sun May 21 2017 The Flood Warning continues for The Walker River Near Mason. * from early Tuesday morning until further notice. * At 11:15 AM Sunday the stage was 9.2 feet. * Flood stage is 9.8 feet. * Major flooding is forecast. * Forecast...Rise above flood stage by early Tuesday morning and continue to rise to near 13.3 feet by early Friday morning. Additional rises are possible thereafter. * Impact...At 13.0 feet...Near record flooding in the Mason Valley-Yerington area. Significant flooding of homes and businesses in Yerington is possible if breaches develop and the river spreads east. Extensive flooding of agricultural lands likely. Many primary and secondary roads flooded. About 3500 cfs. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
145 WGUS85 KREV 221733 FLSREV Flood Statement National Weather Service Reno NV 1033 AM PDT Mon May 22 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County For the Mainstem Walker River...including Mason...Minor flooding is now forecast. Above normal temperatures will produce increased snowmelt in the upper part of the Walker River basin through this week. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley/Yerington area to Weber Reservoir. Up to moderate flooding is possible through the Mason Valley. These high flows are likely to last into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on snowmelt and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-232333- /O.EXT.KREV.FL.W.0024.170524T1600Z-000000T0000Z/ /MASN2.1.SM.170524T1600Z.170526T2200Z.000000T0000Z.UU/ 1033 AM PDT Mon May 22 2017 The Flood Warning continues for The Walker River Near Mason. * from Wednesday morning until further notice. * At 10:15 AM Monday the stage was 9.3 feet. * Flood stage is 9.8 feet. * Minor flooding is forecast. * Forecast...Rise above flood stage by late Wednesday morning and continue to rise to near 10.8 feet by Friday afternoon. * Impact...At 10.8 feet...Minor flooding of lowlands...pasture and farmland adjacent to the river throughout the Mason Valley-Yerington area. Some rural roads flood. Preventative sandbagging of low structures in Mason and Yerington may be necessary as river rises...but little flooding occurs. Some minor flooding of basements and yards in Mason. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
856 WGUS85 KREV 221738 CCA FLSREV Flood Statement National Weather Service Reno NV 1033 AM PDT Mon May 22 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County For the Mainstem Walker River...including Mason...Minor flooding is now forecast. Above normal temperatures will produce increased snowmelt in the upper part of the Walker River basin through this week. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley/Yerington area to Weber Reservoir. Up to moderate flooding is possible through the Mason Valley. These high flows are likely to last into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on snowmelt and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-232333- /O.EXT.KREV.FL.W.0024.170524T1600Z-000000T0000Z/ /MASN2.1.SM.170524T1600Z.170526T2200Z.000000T0000Z.UU/ 1033 AM PDT Mon May 22 2017 The Flood Warning continues for The Walker River Near Mason. * from Wednesday morning until further notice. * At 10:15 AM Monday the stage was 9.3 feet. * Flood stage is 9.8 feet. * Minor flooding is forecast. * Forecast...Rise above flood stage by late Wednesday morning and continue to rise to near 10.8 feet by Friday afternoon. * Impact...At 10.8 feet...Minor flooding of lowlands...pasture and farmland adjacent to the river throughout the Mason Valley-Yerington area. Some rural roads flood. Preventative sandbagging of low structures in Mason and Yerington may be necessary as river rises...but little flooding occurs. Some minor flooding of basements and yards in Mason. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
598 WGUS85 KREV 231639 FLSREV Flood Statement National Weather Service Reno NV 939 AM PDT Tue May 23 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County For the Mainstem Walker River...including Mason...Minor flooding is forecast. Above normal temperatures will produce increased snowmelt in the upper part of the Walker River basin through the Memorial Day weekend and into next week. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on snowmelt and temperature conditions at time of issuance. If actual conditions vary from these forecasts, river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-242239- /O.EXT.KREV.FL.W.0024.170525T1700Z-000000T0000Z/ /MASN2.1.SM.170525T1700Z.170527T0000Z.000000T0000Z.UU/ 939 AM PDT Tue May 23 2017 The Flood Warning continues for The Walker River Near Mason. * from Thursday morning until further notice. * At 8:15 AM Tuesday the stage was 9.3 feet. * Flood stage is 9.8 feet. * Minor flooding is forecast. Moderate flooding is possible next week. * Forecast...Rise above flood stage sometime Thursday and remain above flood stage into the Memorial Day weekend. The river will likely rise again next week and may exceed moderate flood stage. * Impact...Minor flooding of lowlands, roads, pasture and farmland near the river in the Mason Valley-Yerington area. Flood impacts may become more severe next week. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
073 WGUS85 KREV 242007 FLSREV Flood Statement National Weather Service Reno NV 107 PM PDT Wed May 24 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warm temperatures in the high Sierra will produce increased snowmelt in the upper part of the Walker River basin into next week. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-260207- /O.EXT.KREV.FL.W.0024.170526T2200Z-170528T1600Z/ /MASN2.1.SM.170526T2200Z.170526T2200Z.170528T0400Z.UU/ 107 PM PDT Wed May 24 2017 The Flood Warning continues for The Walker River Near Mason. * from Friday afternoon to Sunday morning. * At 12:15 PM Wednesday the stage was 9.3 feet. * Flood stage is 9.8 feet. * Forecast...The river is expected to rise to near flood stage Friday afternoon. Additional rises are possible next week. * Impact...Minor flooding of lowlands, roads, pasture and farmland near the river in the Mason Valley-Yerington area. Flood impacts may become more severe next week. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
786 WGUS85 KREV 260041 FLSREV Flood Statement National Weather Service Reno NV 541 PM PDT Thu May 25 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warm temperatures in the high Sierra will produce increased snowmelt in the upper part of the Walker River basin into next week. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last into June. The forecast for the Mason-Yerington area is changing each day due to changes in the snowpack and forecast temperatures and more precise management of both Bridgeport Reservoir and Topaz Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-290041- /O.EXT.KREV.FL.W.0024.170529T1900Z-000000T0000Z/ /MASN2.1.SM.170529T1900Z.170530T0100Z.000000T0000Z.UU/ 541 PM PDT Thu May 25 2017 The Flood Warning continues for The Walker River Near Mason. * from Monday afternoon until further notice. * At 5:15 PM Thursday the stage was 9.5 feet. * Flood stage is 9.8 feet. * Forecast...the river will rise to around 10.0 feet by Monday. Additional rises are likely later next week. * Impact...Minor flooding of lowlands, roads, pasture and farmland near the river in the Mason Valley-Yerington area. Flood impacts may become more severe next week. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
523 WGUS85 KREV 262255 FLSREV Flood Statement National Weather Service Reno NV 355 PM PDT Fri May 26 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Above normal temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin later this weekend and early next week. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-282255- /O.EXT.KREV.FL.W.0024.170527T0100Z-000000T0000Z/ /MASN2.1.SM.170527T0100Z.170530T2200Z.000000T0000Z.UU/ 355 PM PDT Fri May 26 2017 The Flood Warning continues for The Walker River Near Mason. * until further notice. * At 3:15 PM Friday the stage was 9.7 feet. * Flood stage is 9.8 feet. * Minor flooding is forecast. The river will continue to slowly rise into early next week. Additional rises are likely late next week. * Impact...At 10.3 feet...Minor flooding of lowlands...pasture and farmland begin in Mason Valley-Yerington area. Preventative sandbagging of lowest homes and businesses immediately adjacent to river should begin if further rises are possible...but little flooding occurs. Some isolated flooding of rural roads. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
937 WGUS85 KREV 282155 FLSREV Flood Statement National Weather Service Reno NV 255 PM PDT Sun May 28 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Above normal temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin the week ahead with a rapid increase in flow anticipated by the end of the work week. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-310955- /O.CON.KREV.FL.W.0024.000000T0000Z-000000T0000Z/ /MASN2.1.SM.170528T1940Z.170601T2300Z.000000T0000Z.UU/ 255 PM PDT Sun May 28 2017 The Flood Warning continues for The Walker River Near Mason. * until further notice. * At 2:15 PM Sunday the stage was 9.8 feet. * Flood stage is 9.8 feet. * Minor flooding occurring and minor flooding is forecast. * Forecast...Rise to near 10.7 feet by Thursday afternoon. Additional rises are possible thereafter. * Impact...At 10.8 feet...Minor flooding of lowlands...pasture and farmland adjacent to the river throughout the Mason Valley-Yerington area. Some rural roads flood. Preventative sandbagging of low structures in Mason and Yerington may be necessary as river rises...but little flooding occurs. Some minor flooding of basements and yards in Mason. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
333 WGUS85 KREV 310233 FLSREV Flood Statement National Weather Service Reno NV 733 PM PDT Tue May 30 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warming temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin for much of this week and into the weekend. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-020233- /O.CON.KREV.FL.W.0024.000000T0000Z-000000T0000Z/ /MASN2.1.SM.170528T1940Z.170604T0100Z.000000T0000Z.UU/ 733 PM PDT Tue May 30 2017 The Flood Warning continues for The Walker River Near Mason. * until further notice. * At 7:15 PM Tuesday the stage was 9.8 feet. * Flood stage is 9.8 feet. * Minor flooding is forecast. * Forecast...Rise to near 10.8 feet by Saturday evening. Additional rises are possible thereafter. * Impact...At 10.8 feet...Minor flooding of lowlands...pasture and farmland adjacent to the river throughout the Mason Valley-Yerington area. Some rural roads flood. Preventative sandbagging of low structures in Mason and Yerington may be necessary as river rises...but little flooding occurs. Some minor flooding of basements and yards in Mason. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
395 WGUS85 KREV 010442 FLSREV Flood Statement National Weather Service Reno NV 942 PM PDT Wed May 31 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warming temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin for much of this week and into the weekend. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-031642- /O.CON.KREV.FL.W.0024.000000T0000Z-000000T0000Z/ /MASN2.1.SM.170528T1940Z.170605T0600Z.000000T0000Z.UU/ 942 PM PDT Wed May 31 2017 The Flood Warning continues for The Walker River Near Mason. * until further notice. * At 9:15 PM Wednesday the stage was 9.9 feet. * Flood stage is 9.8 feet. * Minor flooding is occurring and Minor flooding is forecast. * Forecast...Rise to 10.4 feet by Saturday morning, then to 10.7 feet by Tuesday morning. Additional rises are possible thereafter. * Impact...At 10.8 feet...Minor flooding of lowlands...pasture and farmland adjacent to the river throughout the Mason Valley-Yerington area. Some rural roads flood. Preventative sandbagging of low structures in Mason and Yerington may be necessary as river rises...but little flooding occurs. Some minor flooding of basements and yards in Mason. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
772 WGUS85 KREV 020455 FLSREV Flood Statement National Weather Service Reno NV 955 PM PDT Thu Jun 1 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warming temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin into the weekend. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-041655- /O.CON.KREV.FL.W.0024.000000T0000Z-000000T0000Z/ /MASN2.1.SM.170528T1940Z.170606T0300Z.000000T0000Z.UU/ 955 PM PDT Thu Jun 1 2017 The Flood Warning continues for The Walker River Near Mason. * until further notice. * At 9:15 PM Thursday the stage was 9.9 feet. * Flood stage is 9.8 feet. * Minor flooding is occurring and Minor flooding is forecast. * Forecast: Rise to 10.2 feet by Friday morning, then to 10.7 feet by Wednesday morning of next week. Additional rises are possible thereafter. * Impact...At 10.8 feet...Minor flooding of lowlands...pasture and farmland adjacent to the river throughout the Mason Valley-Yerington area. Some rural roads flood. Preventative sandbagging of low structures in Mason and Yerington may be necessary as river rises...but little flooding occurs. Some minor flooding of basements and yards in Mason. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
326 WGUS85 KREV 030513 FLSREV Flood Statement National Weather Service Reno NV 1013 PM PDT Fri Jun 2 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warming temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin into the weekend. This increased runoff will create high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. Note: The downward change in the forecast is due to an increased number of flow measurements taken in recent days leading to a rating curve shift. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-051713- /O.CON.KREV.FL.W.0024.000000T0000Z-000000T0000Z/ /MASN2.1.SM.170528T1940Z.170606T2100Z.000000T0000Z.UU/ 1013 PM PDT Fri Jun 2 2017 The Flood Warning continues for The Walker River Near Mason. * Until further notice. * At 9:15 PM Friday the stage was 9.8 feet. * Flood stage is 9.8 feet. * Minor flooding is occurring and minor flooding is forecast. * Forecast...Continue to rise to near 10.1 feet by early Tuesday afternoon. Additional rises are possible thereafter. * Impact...At 10.0 feet...Minor flooding of lowlands...pasture... cropland and some rural roads throughout the Mason Valley/Yerington area. No flooding of structures or roads. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
076 WGUS85 KREV 050114 FLSREV Flood Statement National Weather Service Reno NV 614 PM PDT Sun Jun 4 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warming temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin. This continues to produce high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-071314- /O.CON.KREV.FL.W.0024.000000T0000Z-000000T0000Z/ /MASN2.2.SM.170528T1940Z.170609T0400Z.000000T0000Z.UU/ 614 PM PDT Sun Jun 4 2017 The Flood Warning continues for The Walker River Near Mason. * until further notice. * At 4:15 PM Sunday the stage was 9.8 feet. * Flood stage is 9.8 feet. * Minor to Moderate flooding is forecast. * Forecast...Continue to rise to near 11 feet by Thursday morning. Additional rises are possible thereafter. * Impact...At 11.0 feet...Minor to moderate flooding of lowlands...pasture and farmland adjacent to river throughout Mason Valley-Yerington area. Several rural and some secondary public roads flood. Yards and basements of lowest homes adjacent to the river in mason and Yerington begin flooding...preventative sandbagging is necessary. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
562 WGUS85 KREV 052256 FLSREV Flood Statement National Weather Service Reno NV 356 PM PDT Mon Jun 5 2017 ...The Flood Warning continues for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Warming temperatures in the high Sierra will continue producing increased snowmelt in the upper part of the Walker River basin. This continues to produce high flows in the Walker River basin from above the confluence of the East and West Walker Rivers downstream through the Mason Valley and Yerington area to Weber Reservoir. High flows are likely to last well into June. NOTE: Due to decreased releases out of Topaz Reservoir the forecast has been adjusted downward for the Mason area. Keep in mind that if additional changes are made to releases upstream that the forecast may again change. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-081056- /O.CON.KREV.FL.W.0024.000000T0000Z-000000T0000Z/ /MASN2.1.SM.170528T1940Z.170606T1900Z.000000T0000Z.UU/ 356 PM PDT Mon Jun 5 2017 The Flood Warning continues for The Walker River Near Mason. * until further notice. * At 3:15 PM Monday the stage was 9.9 feet. * Flood stage is 9.8 feet. * Minor flooding is occurring and Minor flooding is forecast. * Forecast...The river will continue rising to near 10.4 feet by early Tuesday afternoon then begin falling. Additional future rises are possible through the month of June. * Impact...At 10.5 feet...Minor flooding of lowlands...pasture... farmland and some rural roads in Mason Valley. Preventative sandbagging of lowest homes in Mason and Yerington should be done as river rises...but little flooding occurs. There may be some minor flooding of yards and basements in Mason. * Flood history...This crest compares to a previous crest of 10.8 feet on July 1 2011. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
403 WGUS85 KREV 081013 FLSREV Flood Statement National Weather Service Reno NV 313 AM PDT Thu Jun 8 2017 ...The Flood Warning is cancelled for the following rivers in Nevada... Walker River Near Mason affecting Lyon County Cooler temperatures will result in reduced flows on the West Walker River over the next few days. Flows will remain elevated on the East Walker River. Below the confluence the Walker River through Yerington will slowly fall today, but flows will remain elevated farther downstream near Wabuska to Weber Reservoir. Reservoir management activities at Topaz Lake on the West Walker River could result in higher flows later this week. PRECAUTIONARY/PREPAREDNESS ACTIONS... These river forecasts are based on forecast rainfall and temperature conditions at time of issuance. If actual conditions vary from these forecasts...river conditions will vary accordingly. River forecasts include current and planned reservoir releases. && NVC019-081043- /O.CAN.KREV.FL.W.0024.000000T0000Z-170608T1013Z/ /MASN2.1.SM.170528T1940Z.170607T0345Z.170608T0000Z.UU/ 313 AM PDT Thu Jun 8 2017 The Flood Warning is cancelled for The Walker River Near Mason. * At 2:15 AM Thursday the stage was 9.6 feet. * Flood stage is 9.8 feet. * Fell below flood stage at 5:00 PM Wednesday. * Forecast...The river will continue to fall to 9.3 feet by early Friday morning. && LAT...LON 3881 11920 3917 11927 3919 11898 3912 11890 3885 11908 $$
What forecasters said that day
The local office's own words before this river flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Reno, NV wrote its last area forecast discussion before this river flood warning went out at May 18, 3:11 AM PDT, 9 hours 25 minutes earlier.
Area forecast discussion, May 18, 3:11 AM PDT, 9 hours 25 minutes before
Area Forecast Discussion National Weather Service Reno NV 311 AM PDT Thu May 18 2017 .SYNOPSIS... A warming trend will start today, with above average temperatures by Saturday. The above average temperatures this weekend will accelerate snowmelt in the Sierra. River and stream flows will increase with an enhanced risk for river flooding, especially on the Walker River, and possibly the Carson River, by next week. A few thunderstorms may form near the Sierra starting on Sunday. && .SHORT TERM... High pressure builds over the West Coast today beginning a significant warming trend. Light easterly flow will keep high temperatures somewhat tamped down today, upper 60s to around 70 for western Nevada and upper 50s to around 60 for Sierra valleys, before the pressure gradient weakens further into the weekend. Afternoon highs increase into the low 80s for western Nevada and low/mid 70s for Sierra valleys by Sunday. River Rises: While weather parameters are generally benign, snowmelt will increase resulting in additional runoff into area rivers. The bottom line is that all rivers will be running fast and very cold; stay away from the rivers if possible. See our hydrology section below for more flooding details. Boyd .LONG TERM...Sunday through Wednesday... Ridge of high pressure continues to amplify on Sunday along the Pacific Northwest coast, while a weak shortwave trough dropping through the northern Rockies splits off over CA. The ridge will keep temperatures warm, around 5-10 degrees above average. The weak low pressure dropping over CA will bring a few degrees of cooling aloft that will help to increase instability over the Sierra. This will bring chances of thunderstorms for the Sierra Sunday through Wednesday, mainly driven by afternoon heating and terrain convergence over the High Sierra. Temperatures will continue to rise into next week as high pressure dominates. Highs will reach into the mid 80s by next week in western Nevada and mid 70s in the Sierra. Snowmelt will increase with the well above normal temperatures. Rises are expected for creeks, streams, and mainstem rivers coming out of the Sierra through next week. See our hydrology section below for more details of potential snowmelt flooding. Hoon && .AVIATION... VFR conditions through the rest of the week, with light winds and mostly clear skies. Hoon && .HYDROLOGY... Warming temperatures late this week and into the weekend will accelerate snowmelt in the Sierra. Overnight low temperatures in the higher elevations are likely to remain above freezing as well... and this will enhance snowmelt further. This increased snowmelt will cause rises in many area small streams and rivers from southern Mono County through the eastern Sierra and into Sierra and Plumas counties. These higher flows are likely to produce overbank flows in the smaller streams at the very least. Farther downstream...flooding possibilities will increase for some of the major basins. Minor flooding is possible by the middle of next week for the Carson Valley area while moderate flooding is highly likely for the Walker River system from Antelope Valley downstream into the Mason Valley...with more extensive flooding possible in Mason Valley. Higher flows are also likely below Weber Reservoir...but the expected extent is unknown at this time. Currently the extent of any flooding is uncertain. Some factors that are unknown at this time include how high temperatures will reach and for what period of time, as well as how reservoir operations will change to mitigate flooding concerns. The Walker River is the biggest concern at this point in time...but not the only area of concern. Make sure to check the most recent forecasts and observations if you live near a stream or river...or plan to hike or camp near any streams or rivers. Remember that snowmelt flows can be highest in the evening and overnight in the smaller streams. && .REV Watches/Warnings/Advisories... NV...None. CA...None. && For more information from the National Weather Service visit... http://weather.gov/reno
The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 11:56 AM PDT | Flood Watch | REV | Douglas, Lyon, Storey, Washoe | 5 days |
Nearby
River Flood Warnings in Nevada, 2017Every river flood warning in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive; the gauge from the NWS water service and the USGS.