Alert archive / California / Flash Flood Warnings in 2021

Flash Flood Warning 2, NWS Hanford, CA

July 28, 2021Fresno County, Madera County, California

NWS Hanford, CA issued this flash flood warning at Jul 28, 2021, 4:02 PM PDT for Fresno County, Madera County, California. It was in force for 58 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 28, 2021, 4:02 PM PDT (23:02 UTC)
Expired: Jul 28, 2021, 5:00 PM PDT
In force: 58 min
Issued by: NWS Hanford, CA
Area: Storm-based polygon
Flood severity: None

Counties Fresno County, CA, Madera County, CA

The radar

The San Joaquin Valley radar (KHNX), 145 km from the middle of the area, began a volume at 23:03 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, 11.0 hours before the alert went out and 239 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2712 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: -22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

871 
WGUS56 KHNX 282302
FFWHNX
CAC019-039-290000-
/O.NEW.KHNX.FF.W.0002.210728T2302Z-210729T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service San Joaquin Valley CA
402 PM PDT Wed Jul 28 2021

The National Weather Service in Hanford CA has issued a

* Flash Flood Warning for...
  Eastern Madera County in central California...
  Northeastern Fresno County in central California...

* Until 500 PM PDT.

* At 402 PM PDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to one inch of rain has
  already 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, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Flash flooding will remain over mainly rural areas of eastern
  Madera and northeastern Fresno Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 3760 11904 3748 11892 3741 11905 3754 11916

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

KD

1 follow-up statement

910 
WGUS76 KHNX 282355
FFSHNX

Flash Flood Statement
National Weather Service San Joaquin Valley CA
455 PM PDT Wed Jul 28 2021

CAC019-039-290003-
/O.EXP.KHNX.FF.W.0002.000000T0000Z-210729T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Madera CA-Fresno CA-
455 PM PDT Wed Jul 28 2021

...THE FLASH FLOOD WARNING FOR EASTERN MADERA AND NORTHEASTERN FRESNO
COUNTIES WILL EXPIRE AT 500 PM PDT...

The heaviest rain is now over and so is the threat of flash 
flooding.  


LAT...LON 3760 11904 3748 11892 3741 11905 3754 11916

$$

KD

The office that day

Everything else NWS Hanford, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 27, 5:47 PM PDT	Special Weather Statement	HNX		43 min
Jul 28, 2:59 PM PDT	Special Weather Statement	HNX		46 min
Jul 28, 3:36 PM PDT	Flash Flood Warning	HNX	Fresno	67 min
Jul 28, 4:20 PM PDT	Flash Flood Warning	HNX	Madera, Tuolumne	55 min

Nearby

Flash Flood Warnings in California, 2021 Every 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.