Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 7, NWS Hanford, CA
NWS Hanford, CA issued this flash flood warning at Jul 29, 2021, 3:21 PM PDT for Mariposa County, Tuolumne County, California. It was in force for 84 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 29, 2021, 3:21 PM PDT (22:21 UTC)
- Expired
- Jul 29, 2021, 4:45 PM PDT
- In force
- 84 min
- Issued by
- NWS Hanford, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Mariposa County, CA, Tuolumne County, CA
The radar
The San Joaquin Valley radar (KHNX), 177 km from the middle of the area, began a volume at 22:25 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
Oakland, CA (KOAK), launched 12:00Z, 10.4 hours before the alert went out and 224 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
- 1504 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
488
WGUS56 KHNX 292221
FFWHNX
CAC043-109-292345-
/O.NEW.KHNX.FF.W.0007.210729T2221Z-210729T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Joaquin Valley CA
321 PM PDT Thu Jul 29 2021
The National Weather Service in Hanford CA has issued a
* Flash Flood Warning for...
Northeastern Mariposa County in central California...
Southwestern Tuolumne County in northern California...
* Until 445 PM PDT.
* At 319 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between one to one and a half
inches of rain have fallen. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams as well as other
drainage and low lying areas.
* Some locations that will experience flooding include...
White Wolf Campground, Hetch Hetchy, Hetch Hetchy Ranger Station,
Yosemite Creek Campground and Rancheria Falls Wilderness
Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3796 11953 3783 11952 3781 11972 3785 11979
3792 11982 3800 11973
FLASH FLOOD...RADAR INDICATED Additional rainfall amounts of one
quarter to one half inches of rain over the next hour.
$$
CMc2 follow-up statements
156
WGUS76 KHNX 292309
FFSHNX
Flash Flood Statement
National Weather Service San Joaquin Valley CA
409 PM PDT Thu Jul 29 2021
CAC043-109-292345-
/O.CON.KHNX.FF.W.0007.000000T0000Z-210729T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mariposa CA-Tuolumne CA-
409 PM PDT Thu Jul 29 2021
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM PDT FOR
NORTHEASTERN MARIPOSA AND SOUTHWESTERN TUOLUMNE COUNTIES...
At 406 PM PDT, Doppler radar indicated that heavy rainfall across
the area has ended. Between one to two inches of rain has
fallen. Flash flooding is ongoing.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar indicated.
IMPACT...Flooding of small creeks and streams as well as other
drainage and low lying areas.
Some locations that will experience flooding include...
White Wolf Campground, Hetch Hetchy, Hetch Hetchy Ranger Station,
Yosemite Creek Campground and Rancheria Falls Wilderness Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Flooding is occurring or is imminent. It is important to know where
you are relative to streams, rivers, or creeks which can become
killers in heavy rains. Campers and hikers should avoid streams or
creeks.
&&
LAT...LON 3796 11953 3783 11952 3781 11972 3785 11979
3792 11982 3800 11973
FLASH FLOOD...RADAR INDICATED
$$
CMc272
WGUS76 KHNX 292342
FFSHNX
Flash Flood Statement
National Weather Service San Joaquin Valley CA
442 PM PDT Thu Jul 29 2021
CAC043-109-292351-
/O.EXP.KHNX.FF.W.0007.000000T0000Z-210729T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mariposa CA-Tuolumne CA-
442 PM PDT Thu Jul 29 2021
...THE FLASH FLOOD WARNING FOR NORTHEASTERN MARIPOSA AND SOUTHWESTERN
TUOLUMNE COUNTIES WILL EXPIRE AT 445 PM PDT...
The heavy rain has ended. Localized areal flooding is still possible
in the area for the next hour. Please continue to heed any remaining
road closures.
LAT...LON 3796 11953 3783 11952 3781 11972 3785 11979
3792 11982 3800 11973
$$
CMcThe office that day
Everything else NWS Hanford, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 28, 5:07 PM PDT | Flash Flood Warning | HNX | Madera, Mariposa, Tuolumne | 3 min |
| Jul 28, 5:23 PM PDT | Flash Flood Warning | HNX | Madera, Mariposa, Tuolumne | 82 min |
| Jul 28, 7:00 PM PDT | Special Weather Statement | HNX | Tulare | 45 min |
| Jul 29, 9:38 AM PDT | Flash Flood Watch | HNX | 58 hr | |
| Jul 29, 1:51 PM PDT | Special Weather Statement | HNX | Mariposa | 39 min |
| Jul 29, 1:52 PM PDT | Special Weather Statement | HNX | Mariposa | 38 min |
| Jul 29, 2:03 PM PDT | Flash Flood Warning | HNX | Madera, Mariposa | 117 min |
| Jul 29, 2:24 PM PDT | Special Weather Statement | HNX | Tuolumne | 36 min |
| Jul 29, 3:07 PM PDT | Special Weather Statement | HNX | Mariposa | 38 min |
| Jul 29, 3:46 PM PDT | Flash Flood Warning | HNX | Mariposa | 119 min |
| Jul 29, 4:41 PM PDT | Areal Flood Advisory | HNX | Mariposa, Tuolumne | 64 min |
Nearby
Flash Flood Warnings in California, 2021Every flash flood warning 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.