Alert archive / California / Flash Flood Warnings in 2016

Flash Flood Warning 3, NWS San Francisco Bay Area, CA

March 5, 2016Santa Cruz County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Mar 5, 2016, 10:27 PM PST for Santa Cruz County, California. It was in force for 4 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Mar 5, 2016, 10:27 PM PST (06:27 UTC)
Expired
Mar 6, 2016, 2:15 AM PST
In force
4 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Storm-based polygon
Flood severity
None

County Santa Cruz County, CA

The radar

The San Francisco radar (KMUX), 20 km from the middle of the area, began a volume at 06:27 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.

What was reported inside it

TimeReportWhereRemark
Mar 5, 11:07 PM PSTFLOOD6 Nnw Santa Cruz, CASPOTTER REPORTED FLOODING IN STREETS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Oakland, CA (KOAK), launched 00:00Z, 6.5 hours before the alert went out and 76 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-pSkew-T log-p diagram, Oakland, CA at 00:00Z on 2016-03-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 00:00Z on 2016-03-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 198 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
31 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
748 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
198 m²/s²
0-3 km storm-relative helicity
207 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted.

790 
WGUS56 KMTR 060627
FFWMTR
CAC087-061015-
/O.NEW.KMTR.FF.W.0003.160306T0627Z-160306T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1027 PM PST SAT MAR 5 2016

THE NATIONAL WEATHER SERVICE IN THE SAN FRANCISCO BAY AREA HAS ISSUED
A

* FLASH FLOOD WARNING FOR...
  CENTRAL SANTA CRUZ COUNTY IN NORTHERN CALIFORNIA...

* UNTIL 215 AM PST
    
* AT 1021 PM PST...STREAM GAUGE REPORTS INDICATED THAT THE SAN
  LORENZO RIVER AT BIG TREES HAD RISEN TO 16 FEET AND WAS CONTINUING
  TO RISE RAPIDLY. VERY HEAVY RAIN RATES IN THE SAN LORENZO RIVER
  BASIN ON SATURDAY EVENING HAVE RESULTED IN THESE RAPID RISES.
  FLOOD STAGE IS 18 FEET. FLASH FLOODING IS IMMINENT ON THE UPPER
  SAN LORENZO RIVER.  

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... FELTON.
  THE FELTON GROVE NEIGHBORHOOD AND PARADISE PARK COMMUNITIES WILL
  BEGIN TO FLOOD SHORTLY. FELTON COVERED BRIDGE PARK IS EXPECTED TO
  FLOOD. 
  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. NEVER CROSS A FLOODED ROADWAY IN AN
AUTOMOBILE. TURN AROUND...DON'T DROWN.

&&

LAT...LON 3708 12206 3701 12206 3701 12210 3707 12213

$$

DYKEMA
1 follow-up statement
685 
WGUS76 KMTR 061020
FFSMTR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
220 AM PST SUN MAR 6 2016

CAC087-061028-
/O.EXP.KMTR.FF.W.0003.000000T0000Z-160306T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA CRUZ CA-
220 AM PST SUN MAR 6 2016

...THE FLASH FLOOD WARNING FOR CENTRAL SANTA CRUZ COUNTY HAS
EXPIRED...

THE SAN LORENZO RIVER AT BIG TREES HAS FALLEN BELOW FLOOD STAGE.
HEAVY RAIN IS NO LONGER EXPECTED. THEREFORE...THE FLASH FLOOD
WARNING HAS BEEN ALLOWED TO EXPIRE. PLEASE CONTINUE TO HEED ALL ROAD
CLOSURES.

LAT...LON 3708 12206 3701 12206 3701 12210 3707 12213

$$

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 5, 4:17 PM PSTAreal Flood AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more6 hr
Mar 5, 9:07 PM PSTSmall Craft AdvisoryMTR54 hr
Mar 5, 9:59 PM PSTFlash Flood WarningMTRNapa3 hr
Mar 5, 10:14 PM PSTFlash Flood WatchMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 4 more5 hr
Mar 5, 10:41 PM PSTFlash Flood WarningMTRAlameda4 hr
Mar 5, 10:50 PM PSTFlash Flood WarningMTRSonoma4 hr
Mar 5, 11:46 PM PSTFlash Flood WarningMTRSanta Cruz3 hr
Mar 6, 12:12 AM PSTFlash Flood WarningMTRSanta Cruz108 min
Mar 6, 2:24 AM PSTGale WarningMTR23 hr
Mar 6, 2:24 AM PSTSmall Craft AdvisoryMTR13 hr
Mar 6, 4:57 AM PSTWind AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more23 hr
Mar 6, 5:16 AM PSTFlash Flood WatchMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more23 hr

Nearby

Flash Flood Warnings in California, 2016Every flash flood warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.