Alert archive / California / Winter Weather Advisories in 2012

Winter Weather Advisory 7, NWS San Diego, CA

March 16, 20124 counties in California

NWS San Diego, CA issued this winter weather advisory at Mar 16, 2012, 1:40 PM PDT for 4 counties in California. It took effect at Mar 17, 2012, 12:00 PM PDT. It was in force for 33 hr.

The area

The counties it named.

The facts

Issued
Mar 16, 2012, 1:40 PM PDT (20:40 UTC)
In effect from
Mar 17, 2012, 12:00 PM PDT
Expired
Mar 18, 2012, 9:00 PM PDT
In force
33 hr
Issued by
NWS San Diego, CA

Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 88 km from the middle of the area, began a volume at 20:41 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

San Diego, CA (KNKX), launched 12:00Z, 8.7 hours before the alert went out and 124 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, San Diego, CA at 12:00Z on 2012-03-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 joules per kilogram.LCLEL10008507005003002001001 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, San Diego, CA at 12:00Z on 2012-03-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939Sfc1 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
1 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
518 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
69 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Diego, CA wrote its last area forecast discussion before this winter weather advisory went out at Mar 16, 9:55 AM PDT, 3 hours 45 minutes earlier.

Area forecast discussion, Mar 16, 9:55 AM PDT, 3 hours 45 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Mar 16, 4:00 AM PDT, 9 hours 40 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN DIEGO CA
400 AM PDT FRI MAR 16 2012

CAZ042-043-048-050-055>058-060>062-PZZ750-775-171200-
ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS-
SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE-
SAN DIEGO COUNTY VALLEYS-SAN BERNARDINO COUNTY MOUNTAINS-
RIVERSIDE COUNTY MOUNTAINS-SANTA ANA MOUNTAINS AND FOOTHILLS-
SAN DIEGO COUNTY MOUNTAINS-APPLE AND LUCERNE VALLEYS-
COACHELLA VALLEY-SAN DIEGO COUNTY DESERTS-
COASTAL WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER AND OUT
30 NM-
WATERS FROM SAN MATEO POINT TO THE MEXICAN BORDER EXTENDING 30 TO
60 NM OUT INCLUDING SAN CLEMENTE ISLAND-
400 AM PDT FRI MAR 16 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF EXTREME
SOUTHWESTERN CALIFORNIA.

.DAY ONE...TODAY AND TONIGHT

LIGHT PRECIPITATION MAY BEGIN LATE TONIGHT AHEAD OF A STRONG PACIFIC
STORM. BREEZY CONDITIONS ARE POSSIBLE IN THE MOUNTAINS AND DESERTS
TONIGHT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

A STRONG COLD PACIFIC STORM SYSTEM IS EXPECTED TO MOVE SLOWLY INLAND
THROUGH SOUTHERN CALIFORNIA LATE TONIGHT THROUGH MONDAY. IT
WILL BE MUCH COOLER WITH PERIODS OF STRONG GUSTY SOUTHWEST TO WEST
WINDS IN THE MOUNTAINS AND DESERTS...AND MODERATE TO LOCALLY HEAVY
PRECIPITATION WITH LOW SNOW LEVELS.

WIND GUSTS IN THE MOUNTAINS AND DESERTS WILL MAINLY BE BETWEEN 55
AND 65 MPH WITH ISOLATED GUSTS TO 75 MPH...STRONGEST SATURDAY
AFTERNOON AND EVENING. RAINFALL TOTALS FOR THE SATURDAY THROUGH
MONDAY PERIOD COULD RANGE FROM ONE TO TWO INCHES NEAR THE COAST TO 3
TO 5 INCHES IN THE MOUNTAINS WITH ONE-QUARTER TO ONE-HALF INCH IN
THE DESERTS. SNOW LEVELS COULD LOWER TO 2500 TO 3000 FEET SATURDAY
NIGHT AND SUNDAY...WITH SEVERAL INCHES OF SNOWFALL AT LOWER
MOUNTAIN ELEVATIONS POSSIBLE AND LOCALLY 2 FEET OR MORE ON THE
HIGHEST PEAKS. THERE IS ALSO THE POSSIBILITY OF THUNDERSTORMS WITH
SMALL HAIL OR GRAUPEL LATE SATURDAY AFTERNOON AND EVENING...AND
WATERSPOUTS OVER THE COASTAL WATERS. THIS STORM IS ALSO EXPECTED TO
BRING HIGH SURF TO THE BEACHES. A WINTER STORM WARNING IS IN EFFECT
FOR THE MOUNTAINS ABOVE 4000 FEET FOR SATURDAY AND SUNDAY WITH A
HIGH WIND WARNING FOR THE MOUNTAINS AND DESERTS SATURDAY AND SUNDAY.
WIND ADVISORIES ARE IN EFFECT FOR AREAS WEST OF THE MOUNTAINS
SATURDAY AND SUNDAY. A GALE WATCH IS IN EFFECT FOR THE INNER AND
OUTER COASTAL WATERS SATURDAY THROUGH SUNDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...
SKYWARN WEATHER ACTIVATION IS NOT REQUESTED FOR THIS AREA...
HOWEVER WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT
WEATHER CONDITIONS.

SS

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 15, 9:30 PM PDTGale WatchSGX17 hr
Mar 16, 3:14 AM PDTHigh Wind WarningSGXRiverside, San Bernardino, San Diego48 hr
Mar 16, 3:14 AM PDTWind AdvisorySGXOrange, Riverside, San Bernardino, San Diego3 days
Mar 16, 3:15 AM PDTWinter Storm WarningSGXRiverside, San Bernardino, San Diego66 hr
Mar 16, 2:00 PM PDTHigh Surf AdvisorySGXSan Diego67 hr
Mar 16, 2:01 PM PDTGale WarningSGX61 hr

Nearby

Winter Weather Advisories in California, 2012Every winter weather advisory in 2012

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.