Alert archive / California / Flash Flood Warnings in 2009

Flash Flood Warning 2, NWS San Francisco Bay Area, CA

February 17, 2009Monterey County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 17, 2009, 6:34 AM PST for Monterey County, California. It was in force for 26 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
Feb 17, 2009, 6:34 AM PST (14:34 UTC)
Expired
Feb 17, 2009, 7:00 AM PST
In force
26 min
Issued by
NWS San Francisco Bay Area, CA
Area
Storm-based polygon
Flood severity
None

County Monterey County, CA

The radar

The San Francisco radar (KMUX), 105 km from the middle of the area, began a volume at 14:34 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 nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 2.6 hours before the alert went out and 173 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 12:00Z on 2009-02-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 42 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 12:00Z on 2009-02-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 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
42 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
688 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS56 KMTR 171434
FFWMTR
CAC053-171500-
/O.NEW.KMTR.FF.W.0002.090217T1434Z-090217T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
634 AM PST TUE FEB 17 2009

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

* FLASH FLOOD WARNING FOR FLASH FLOODING AND DEBRIS FLOWS FOR...
  MONTEREY COUNTY IN CENTRAL CALIFORNIA...
  THIS INCLUDES THE CITIES OF...JAMESBURG...BIG SUR VILLAGE...

* UNTIL 700 AM PST

* AT 629 AM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  A STRONG THUNDERSTORM WITH HEAVY RAIN. 

* THE STORM PRODUCING WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
  OF THE INDICATED COUNTY.

THIS WARNING REPLACES THE PREVIOUS FLASH FLOOD WARNING ISSUED AT 609 
AM PST.

MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL PEOPLE
CAUGHT IN THEIR PATH.

LAT...LON 3617 12169 3617 12171 3619 12171 3619 12174
      3622 12178 3622 12180 3625 12184 3627 12185
      3638 12168 3628 12149 3614 12167
TIME...MOT...LOC 1433Z 180DEG 0KT 3626 12169

$$

STROBIN
2 follow-up statements
000 
WGUS76 KMTR 171448
FFSMTR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
648 AM PST TUE FEB 17 2009

CAC053-171500-
/O.CON.KMTR.FF.W.0002.000000T0000Z-090217T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONTEREY CA-
648 AM PST TUE FEB 17 2009

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 AM PST FOR THE
BURN AREAS OF MONTEREY COUNTY...

AT 605 AM PST...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED A MUD AND 
DEBRIS FLOW ON HIGHWAY 1 AT THE JUNCTION OF SYCAMORE CANYON AND 
HIGHWAY 1.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO JAMESBURG AND
BIG SUR VILLAGE

MUD SLIDES AND ROCK SLIDES CAN POTENTIALLY TRAP AND KILL PEOPLE
CAUGHT IN THEIR PATH.

LAT...LON 3617 12169 3617 12171 3619 12171 3619 12174
      3622 12178 3622 12180 3625 12184 3627 12185
      3638 12168 3628 12149 3614 12167
TIME...MOT...LOC 1446Z 180DEG 0KT 3626 12169

$$

STROBIN
000 
WGUS76 KMTR 171501
FFSMTR

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
701 AM PST TUE FEB 17 2009

CAC053-171511-
/O.EXP.KMTR.FF.W.0002.000000T0000Z-090217T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MONTEREY CA-
701 AM PST TUE FEB 17 2009

...THE FLASH FLOOD WARNING HAS EXPIRED FOR THE BURN AREAS OF MONTEREY
COUNTY...

LAT...LON 3617 12169 3617 12171 3619 12171 3619 12174
      3622 12178 3622 12180 3625 12184 3627 12185
      3638 12168 3628 12149 3614 12167
TIME...MOT...LOC 1448Z 180DEG 0KT 3626 12169

$$

STROBIN

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 16, 4:44 PM PSTSpecial Marine WarningMTR61 min
Feb 17, 6:09 AM PSTFlash Flood WarningMTRMonterey36 min
Feb 17, 7:18 AM PSTAreal Flood AdvisoryMTRAlameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more3 hr
Feb 17, 7:37 AM PSTSevere Thunderstorm WarningMTRSanta Clara, Santa Cruz23 min

Nearby

Flash Flood Warnings in California, 2009Every flash flood warning in 2009

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.