Alert archive / Nevada / Flash Flood Watches in 2021
Flash Flood Watch 2, NWS Reno, NV
NWS Reno, NV issued this flash flood watch at Jul 29, 2021, 12:09 PM PDT for 5 counties in Nevada; 5 counties in California. It took effect at Jul 30, 2021, 12:00 PM PDT. It was in force for 35 hr.
The area
The counties it named.
The facts
- Issued
- Jul 29, 2021, 12:09 PM PDT (19:09 UTC)
- In effect from
- Jul 30, 2021, 12:00 PM PDT
- Expired
- Jul 31, 2021, 11:00 PM PDT
- In force
- 35 hr
- Issued by
- NWS Reno, NV
- Flood severity
- None
Counties Alpine County, CA, El Dorado County, CA, Mono County, CA, Nevada County, CA, Placer County, CA, Douglas County, NV, Lyon County, NV, Mineral County, NV, Storey County, NV, Washoe County, NV
The radar
The Reno radar (KRGX), 84 km from the middle of the area, began a volume at 19:10 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
Reno, NV (KREV), launched 12:00Z, 7.2 hours before the alert went out and 144 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
- 2873 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
542 WGUS65 KREV 291909 FFAREV URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Reno NV 1209 PM PDT Thu Jul 29 2021 CAZ072-073-NVZ001>003-310300- /O.NEW.KREV.FF.A.0002.210730T1900Z-210731T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greater Lake Tahoe Area-Mono County-Mineral and Southern Lyon Counties-Greater Lake Tahoe Area-Greater Reno-Carson City-Minden Area- Including the cities of Truckee, Virginia City, Stateline, Smith Valley, Tahoe City, Bridgeport, Lee Vining, Glenbrook, Hawthorne, Incline Village, Sparks, Gardnerville, Schurz, Yerington, Mina, South Lake Tahoe, Coleville, Markleeville, Mammoth Lakes, and Verdi 1209 PM PDT Thu Jul 29 2021 ...FLASH FLOOD WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH FRIDAY EVENING... The National Weather Service in Reno has issued a * Flash Flood Watch for portions of east central California and western Nevada, including the following areas, in east central California, Greater Lake Tahoe Area and Mono County. In western Nevada, Greater Lake Tahoe Area, Greater Reno-Carson City-Minden Area and Mineral and Southern Lyon Counties. * From Friday afternoon through Friday evening. * Thunderstorms with heavy rain and intense rainfall rates are likely Friday afternoon into Friday evening in the Sierra south of Lake Tahoe and across western Nevada. Burn scars, steep terrain, and poorly drained urban areas are at greatest risk for flash flooding. * Alpine, Mono, Douglas, Lyon, and Mineral Counties are at greatest risk for flash flooding. Heavy rain may also impact the Tahoe Basin, Reno, Carson City, and Storey County. Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs on Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ BB
6 follow-up statements
569 WGUS65 KREV 301801 FFAREV URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Reno NV 1101 AM PDT Fri Jul 30 2021 CAZ073-NVZ001-310215- /O.EXT.KREV.FF.A.0002.210730T1900Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mono County-Mineral and Southern Lyon Counties- Including the cities of Smith Valley, Bridgeport, Lee Vining, Hawthorne, Schurz, Yerington, Mina, Coleville, and Mammoth Lakes 1101 AM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch is now in effect for * Portions of east central California and western Nevada, including the following areas, in east central California, Mono County. In western Nevada, Mineral and Southern Lyon Counties. * Through Saturday evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening and Saturday afternoon into Saturday evening across the eastern Sierra, southern Lyon County, and western Mineral County. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today and Saturday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CAZ072-NVZ002-003-310215- /O.CON.KREV.FF.A.0002.210730T1900Z-210731T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greater Lake Tahoe Area-Greater Lake Tahoe Area-Greater Reno-Carson City-Minden Area- Including the cities of Truckee, Virginia City, Stateline, Tahoe City, Sparks, Glenbrook, Incline Village, Gardnerville, South Lake Tahoe, Markleeville, and Verdi 1101 AM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 PM PDT THIS EVENING... The Flash Flood Watch continues for * Portions of east central California and western Nevada, including the following areas, in east central California, Greater Lake Tahoe Area. In western Nevada, Greater Lake Tahoe Area and Greater Reno-Carson City-Minden Area. * Until 8 PM PDT this evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening in the Sierra south of Lake Tahoe and across Douglas County. Burn scars, steep terrain, and poorly drained urban areas are at greatest risk for flash flooding. * Heavy rain may also impact the Tahoe Basin, Reno, Carson City, and Storey County. Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ BB
049 WGUS65 KREV 310143 FFAREV URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Reno NV 643 PM PDT Fri Jul 30 2021 CAZ072-NVZ002-003-310600- /O.EXT.KREV.FF.A.0002.000000T0000Z-210731T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greater Lake Tahoe Area-Greater Lake Tahoe Area-Greater Reno-Carson City-Minden Area- Including the cities of Truckee, Virginia City, Stateline, Tahoe City, Sparks, Glenbrook, Incline Village, Gardnerville, South Lake Tahoe, Markleeville, and Verdi 643 PM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH NOW IN EFFECT UNTIL 11 PM PDT THIS EVENING... The Flash Flood Watch is now in effect for * Portions of east central California and western Nevada, including the following areas, in east central California, Greater Lake Tahoe Area. In western Nevada, Greater Lake Tahoe Area and Greater Reno-Carson City-Minden Area. * Until 11 PM PDT this evening. * Thunderstorms with heavy rain and intense rainfall rates are likely through this evening in the Sierra south of Lake Tahoe and across Douglas County. Burn scars, steep terrain, and poorly drained urban areas are at greatest risk for flash flooding. * Heavy rain may also impact the Tahoe Basin, Reno, Carson City, and Storey County. Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CAZ073-NVZ001-310945- /O.CON.KREV.FF.A.0002.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mono County-Mineral and Southern Lyon Counties- Including the cities of Smith Valley, Bridgeport, Lee Vining, Hawthorne, Schurz, Yerington, Mina, Coleville, and Mammoth Lakes 643 PM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * Portions of east central California and western Nevada, including the following areas, in east central California, Mono County. In western Nevada, Mineral and Southern Lyon Counties. * Through Saturday evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening and Saturday afternoon into Saturday evening across the eastern Sierra, southern Lyon County, and western Mineral County. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today and Saturday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ EW
920 WGUS65 KREV 310513 FFAREV Flood Watch National Weather Service Reno NV 1013 PM PDT Fri Jul 30 2021 CAZ072-NVZ002-003-310615- /O.CON.KREV.FF.A.0002.000000T0000Z-210731T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greater Lake Tahoe Area-Greater Lake Tahoe Area-Greater Reno-Carson City-Minden Area- Including the cities of Truckee, Virginia City, Stateline, Tahoe City, Sparks, Glenbrook, Incline Village, Gardnerville, South Lake Tahoe, Markleeville, and Verdi 1013 PM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... The Flash Flood Watch continues for * Portions of east central California and western Nevada, including the following areas, in east central California, Greater Lake Tahoe Area. In western Nevada, Greater Lake Tahoe Area and Greater Reno-Carson City-Minden Area. * Until 11 PM PDT this evening. * Thunderstorms with heavy rain and intense rainfall rates are likely through this evening in the Sierra south of Lake Tahoe and across Douglas County. Burn scars, steep terrain, and poorly drained urban areas are at greatest risk for flash flooding. * Heavy rain may also impact the Tahoe Basin, Reno, Carson City, and Storey County. Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CAZ073-NVZ001-010300- /O.CON.KREV.FF.A.0002.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mono County-Mineral and Southern Lyon Counties- Including the cities of Smith Valley, Bridgeport, Lee Vining, Hawthorne, Schurz, Yerington, Mina, Coleville, and Mammoth Lakes 1013 PM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * Portions of east central California and western Nevada, including the following areas, in east central California, Mono County. In western Nevada, Mineral and Southern Lyon Counties. * Through Saturday evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening and Saturday afternoon into Saturday evening across the eastern Sierra, southern Lyon County, and western Mineral County. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today and Saturday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ EW
987 WGUS65 KREV 310549 FFAREV Flood Watch National Weather Service Reno NV 1049 PM PDT Fri Jul 30 2021 CAZ072-NVZ002-003-310700- /O.EXP.KREV.FF.A.0002.000000T0000Z-210731T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greater Lake Tahoe Area-Greater Lake Tahoe Area-Greater Reno-Carson City-Minden Area- Including the cities of Truckee, Virginia City, Stateline, Tahoe City, Sparks, Glenbrook, Incline Village, Gardnerville, South Lake Tahoe, Markleeville, and Verdi 1049 PM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH WILL EXPIRE AT 11 PM PDT THIS EVENING... The Flash Flood Watch for portions of east central California and western Nevada, including the following areas, in east central California, Greater Lake Tahoe Area. In western Nevada, Greater Lake Tahoe Area and Greater Reno-Carson City-Minden Area will expire at 11 PM PDT this evening. The Flood Watch is replaced with a Flood Advisory for areas in and around Pine Nut Creek east of Gardnerville. $$ CAZ073-NVZ001-010300- /O.CON.KREV.FF.A.0002.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mono County-Mineral and Southern Lyon Counties- Including the cities of Smith Valley, Bridgeport, Lee Vining, Hawthorne, Schurz, Yerington, Mina, Coleville, and Mammoth Lakes 1049 PM PDT Fri Jul 30 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY EVENING... The Flash Flood Watch continues for * Portions of east central California and western Nevada, including the following areas, in east central California, Mono County. In western Nevada, Mineral and Southern Lyon Counties. * Through Saturday evening. * Thunderstorms with heavy rain and intense rainfall rates are likely Saturday afternoon into Saturday evening across the eastern Sierra, southern Lyon County, and western Mineral County. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs on Saturday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ EW
962 WGUS65 KREV 311451 FFAREV URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Reno NV 751 AM PDT Sat Jul 31 2021 CAZ072-NVZ002-003-010600- /O.EXB.KREV.FF.A.0002.000000T0000Z-210801T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greater Lake Tahoe Area-Greater Lake Tahoe Area-Greater Reno-Carson City-Minden Area- Including the cities of Truckee, Virginia City, Stateline, Tahoe City, Sparks, Glenbrook, Incline Village, Gardnerville, South Lake Tahoe, Markleeville, and Verdi 751 AM PDT Sat Jul 31 2021 ...FLASH FLOOD WATCH IN EFFECT THROUGH THIS EVENING FOR DOUGLAS COUNTY AND THE TAMARACK AND NUMBERS BURN AREAS... The National Weather Service in Reno has expanded the * Flash Flood Watch to include portions of east central California and western Nevada, including the following areas, in east central California, Greater Lake Tahoe Area. In western Nevada, Greater Lake Tahoe Area and Greater Reno-Carson City-Minden Area. * Through this evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening across Douglas and Alpine counties, including the Tamarack and Numbers burn areas as well as areas near Johnson Lane and Fish Springs. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CAZ073-NVZ001-010300- /O.CON.KREV.FF.A.0002.000000T0000Z-210801T0300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mono County-Mineral and Southern Lyon Counties- Including the cities of Smith Valley, Bridgeport, Lee Vining, Hawthorne, Schurz, Yerington, Mina, Coleville, and Mammoth Lakes 751 AM PDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... The Flash Flood Watch continues for * Portions of east central California and western Nevada, including the following areas, in east central California, Mono County. In western Nevada, Mineral and Southern Lyon Counties. * Through this evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening across the eastern Sierra, southern Lyon County, and western Mineral County. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ EW
399 WGUS65 KREV 311512 FFAREV URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Reno NV 812 AM PDT Sat Jul 31 2021 CAZ073-NVZ001-010600- /O.EXT.KREV.FF.A.0002.000000T0000Z-210801T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mono County-Mineral and Southern Lyon Counties- Including the cities of Smith Valley, Bridgeport, Lee Vining, Hawthorne, Schurz, Yerington, Mina, Coleville, and Mammoth Lakes 812 AM PDT Sat Jul 31 2021 ...FLASH FLOOD WATCH NOW IN EFFECT THROUGH THIS EVENING FOR MONO... MINERAL...AND SOUTHERN LYON COUNTIES... The Flash Flood Watch is now in effect for * Portions of east central California and western Nevada, including the following areas, in east central California, Mono County. In western Nevada, Mineral and Southern Lyon Counties. * Through this evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening across the eastern Sierra, southern Lyon County, and western Mineral County. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ CAZ072-NVZ002-003-010600- /O.CON.KREV.FF.A.0002.000000T0000Z-210801T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Greater Lake Tahoe Area-Greater Lake Tahoe Area-Greater Reno-Carson City-Minden Area- Including the cities of Truckee, Virginia City, Stateline, Tahoe City, Sparks, Glenbrook, Incline Village, Gardnerville, South Lake Tahoe, Markleeville, and Verdi 812 AM PDT Sat Jul 31 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING FOR DOUGLAS AND ALPINE COUNTIES... The Flash Flood Watch continues for * Portions of east central California and western Nevada, including the following areas, in east central California, Greater Lake Tahoe Area. In western Nevada, Greater Lake Tahoe Area and Greater Reno-Carson City-Minden Area. * Through this evening. * Thunderstorms with heavy rain and intense rainfall rates are likely this afternoon into this evening across Douglas and Alpine counties, including the Tamarack and Numbers burn areas as well as areas near Johnson Lane and Fish Springs. Burn scars, steep terrain, and small creeks are at greatest risk for flash flooding. * Debris flows, rock slides, ponding of water on roads, and rapid rises on small creeks are possible if heavy rainfall occurs today. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. && $$ EW
The office that day
Everything else NWS Reno, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 5:10 PM PDT | Special Weather Statement | REV | 35 min | |
| Jul 29, 1:54 PM PDT | Special Weather Statement | REV | Douglas | 51 min |
| Jul 29, 4:19 PM PDT | Special Weather Statement | REV | Sierra | 41 min |
Nearby
Flash Flood Watches in Nevada, 2021Flash Flood Watches in California, 2021Every flash flood watch in 2021
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.