Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 13, NWS Hanford, CA
NWS Hanford, CA issued this flash flood warning at Jul 30, 2021, 4:33 PM PDT for Mariposa County, California. It was in force for 57 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 30, 2021, 4:33 PM PDT (23:33 UTC)
- Expired
- Jul 30, 2021, 5:30 PM PDT
- In force
- 57 min
- Issued by
- NWS Hanford, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Mariposa County, CA
The radar
The San Joaquin Valley radar (KHNX), 158 km from the middle of the area, began a volume at 23:35 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, 11.6 hours before the alert went out and 230 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
- 1819 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
212
WGUS56 KHNX 302333
FFWHNX
CAC043-310030-
/O.NEW.KHNX.FF.W.0013.210730T2333Z-210731T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Joaquin Valley CA
433 PM PDT Fri Jul 30 2021
The National Weather Service in Hanford CA has issued a
* Flash Flood Warning for...
Northeastern Mariposa County in central California...
* Until 530 PM PDT.
* At 432 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. 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, urban areas,
highways, streets and underpasses as well as other
drainage and low lying areas.
* Some locations that will experience flooding include...
Yosemite Valley, Yosemite Glacier Point, Yosemite Valley Vistor
Center, North Pines Campground, Camp 4 Campground, Lower Pines
Campground and Upper Pines Campground.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3777 11952 3766 11958 3771 11966 3778 11964
FLASH FLOOD...RADAR INDICATED
$$
Andersen1 follow-up statement
493 WGUS76 KHNX 310023 FFSHNX Flash Flood Statement National Weather Service San Joaquin Valley CA 523 PM PDT Fri Jul 30 2021 CAC043-310033- /O.EXP.KHNX.FF.W.0013.000000T0000Z-210731T0030Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Mariposa CA- 523 PM PDT Fri Jul 30 2021 ...THE FLASH FLOOD WARNING FOR NORTHEASTERN MARIPOSA COUNTY WILL EXPIRE AT 530 PM PDT... The heavy rain has ended. Flooding is no longer expected to pose a threat. Runoff may continue over the next hour. Please continue to heed any remaining road closures. LAT...LON 3777 11952 3766 11958 3771 11966 3778 11964 $$ Andersen
The office that day
Everything else NWS Hanford, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 5:20 PM PDT | Flash Flood Warning | HNX | Madera | 3 hr |
| Jul 30, 2:52 PM PDT | Flash Flood Warning | HNX | Fresno, Madera | 38 min |
| Jul 30, 3:30 PM PDT | Flash Flood Warning | HNX | Fresno, Madera, Mariposa | 60 min |
| Jul 30, 4:02 PM PDT | Flash Flood Warning | HNX | Mariposa, Tuolumne | 116 min |
| Jul 30, 4:08 PM PDT | Special Weather Statement | HNX | Mariposa | 22 min |
| Jul 30, 4:20 PM PDT | Special Weather Statement | HNX | Tuolumne | 40 min |
| Jul 30, 4:30 PM PDT | Special Weather Statement | HNX | Mariposa | 45 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.