Alert archive / California / River Flood Warnings in 2018

River Flood Warning 1, NWS Hanford, CA

March 22, 2018Merced County, California

NWS Hanford, CA issued this river flood warning at Mar 22, 2018, 9:34 PM PDT for Merced County, California. It took effect at Mar 22, 2018, 11:15 PM PDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Mar 22, 2018, 9:34 PM PDT (04:34 UTC)
In effect from: Mar 22, 2018, 11:15 PM PDT
Expired: Mar 23, 2018, 2:20 PM PDT
In force: 15 hr
Issued by: NWS Hanford, CA
Area: Storm-based polygon
Flood severity: Minor

County Merced County, CA

The radar

The San Francisco radar (KMUX), 105 km from the middle of the area, began a volume at 04:34 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 Bear Creek at McKee Road (MEEC1).

Action stage: 17 ft
Minor stage: 23 ft
Moderate stage: 24.6 ft
Major stage: 25.6 ft

This gauge today: stage, forecast and historic crests

Stage from the USGS instantaneous record, one reading an hour, from a day before the product to a day after it ended. Flood stages are today's.

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 Hanford, CA wrote its last area forecast discussion before this river flood warning went out at Mar 22, 1:51 PM PDT, 7 hours 43 minutes earlier.

Area forecast discussion, Mar 22, 1:51 PM PDT, 7 hours 43 minutes before

Area Forecast Discussion
National Weather Service San Joaquin Valley - Hanford CA
151 PM PDT Thu Mar 22 2018

.SYNOPSIS...
Continued atmospheric river influence will continue over the area
through Friday morning. A brief break from the precipitation will
take place on Friday afternoon and into Saturday morning. Then
chances for light precipitation will increase by late afternoon
Saturday as a low pressure system moves through the region.
Ridging will then begin to move into the area on Monday bringing
warmer temperatures and drying conditions well into the middle of
next week.

&&

.DISCUSSION...Thunderstorm development and heavy rain remain the
main concerns in the short-term, or through this evening. Latest
radar images show a line of heavy rain with embedded thunderstorms
currently moving over Merced and Mariposa Counties along the cold
front pushing into this area. Other heavy showers are also
developing to the south towards Kings Canyon and Sequoia National
Parks. Another batch of moderate showers are moving towards
western Fresno County, including near Coalinga. Some significant
rises in creeks were enough to cause minor flooding in the hills
northwest of Coalinga, such as Los Gatos Creek since this morning.
The cold front will continue to progress southward over Central
California through this evening, and the threat for heavy rain and
thunderstorms will continue, especially along this boundary. In
addition, any areas ahead of the front where cloud cover has
cleared, including much of the western and southern sides of the
San Joaquin Valley can expect additional shower development along
with isolated strong thunderstorms. Flooding near and over burn
scars due to recent wildfires will continue to be a concern
through this evening. Also, rapid rises in creeks and rivers are
expected, especially in areas of heavy rain that could fall over
areas that have already received abundant amounts since last night
and at earlier times with this ongoing storm. Showers are
expected into Friday morning over much of the region, but remain
confined over the mountain areas in the afternoon. The Storm
Prediction Center (NWS SPC) continues to show a marginal risk of
severe thunderstorms in the San Joaquin Valley and into the Sierra
Nevada foothills through this evening, per their latest Mesoscale
Convective Discussion. Please note we have made no significant
changes to the forecast beyond tonight due to the ongoing
concerns.

&&

.AVIATION...
Mountain obscuration due to clouds/precipitation in the Sierra
Nevada and Tehachapi Range, and MVFR/IFR conditions in low ceilings
and precipitation will prevail through tonight, mainly thru 12Z
Friday. Otherwise, VFR conditions will prevail throughout the
central California interior during the next 24 hours.

&&

.AIR QUALITY ISSUES...
None.

&&

.CERTAINTY...

The level of certainty for days 1 and 2 is high.
The level of certainty for days 3 through 7 is medium.

Certainty levels include low...medium...and high. Please visit
www.weather.gov/hnx/certainty.php for additional information
an/or to provide feedback.

&&

.HNX Watches/Warnings/Advisories...
Flash Flood Watch until 8 PM PDT this evening CAZ093>097.

Winter Storm Warning until 11 PM PDT this evening ABOVE 8000
FEET FOR THE CAZ096-097.

&&

public...BSO
avn/fw...BSO
synopsis...BSO

weather.gov/hanford

In the hours before

Special weather statement, Mar 22, 5:51 PM PDT, 3 hours 43 minutes before

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Local storm report, Mar 22, 6:26 PM PDT, 3 hours 8 minutes before

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Local storm report, Mar 22, 6:33 PM PDT, 3 hours 1 minute before

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Special weather statement, Mar 22, 6:37 PM PDT, 2 hours 57 minutes before

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Special weather statement, Mar 22, 7:10 PM PDT, 2 hours 24 minutes before

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Local storm report, Mar 22, 8:32 PM PDT, 1 hour 2 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 22, 5:03 PM PDT	Flash Flood Warning	HNX	Tulare	3 hr
Mar 22, 5:13 PM PDT	Special Weather Statement	HNX	Tulare	47 min
Mar 22, 5:43 PM PDT	Special Weather Statement	HNX	Madera	47 min
Mar 22, 5:45 PM PDT	Special Weather Statement	HNX	Kern	45 min
Mar 22, 5:51 PM PDT	Special Weather Statement	HNX	Kern	39 min
Mar 22, 6:37 PM PDT	Special Weather Statement	HNX	Madera	38 min
Mar 22, 7:09 PM PDT	Areal Flood Advisory	HNX	Fresno, Madera	2 hr
Mar 22, 7:10 PM PDT	Special Weather Statement	HNX	Kern	35 min
Mar 22, 8:13 PM PDT	Flash Flood Watch	HNX		3 hr
Mar 22, 9:04 PM PDT	Areal Flood Advisory	HNX	Kern	116 min
Mar 22, 10:30 PM PDT	Special Weather Statement	HNX	Kern	30 min

Nearby

River Flood Warnings in California, 2018 Every river flood warning in 2018

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.