Alert archive / California / Winter Storm Watches in 2012
Winter Storm Watch 6, NWS San Diego, CA
NWS San Diego, CA issued this winter storm watch at Apr 12, 2012, 9:25 AM PDT for San Diego County, California. It took effect at Apr 13, 2012, 2:00 PM PDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 12, 2012, 9:25 AM PDT (16:25 UTC)
- In effect from
- Apr 13, 2012, 2:00 PM PDT
- Expired
- Apr 12, 2012, 1:08 PM PDT
- In force
- Issued by
- NWS San Diego, CA
County San Diego County, CA
The radar
The San Diego radar (KNKX), 28 km from the middle of the area, began a volume at 16:26 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, 4.4 hours before the alert went out and 47 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.
- Mixed-layer CAPE
- 41 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 579 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm watch 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 storm watch went out at Apr 12, 3:45 AM PDT, 5 hours 40 minutes earlier.
Area forecast discussion, Apr 12, 3:45 AM PDT, 5 hours 40 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, Apr 12, 4:32 AM PDT, 4 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN DIEGO CA 432 AM PDT THU APR 12 2012 CAZ042-043-048-050-057-058-PZZ750-775-131145- ORANGE COUNTY COASTAL AREAS-SAN DIEGO COUNTY COASTAL AREAS- SAN BERNARDINO AND RIVERSIDE COUNTY VALLEYS-THE INLAND EMPIRE- SAN DIEGO COUNTY VALLEYS-SANTA ANA MOUNTAINS AND FOOTHILLS- SAN DIEGO COUNTY MOUNTAINS- 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- 432 AM PDT THU APR 12 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY A WINTER STORM WILL MOVE ACROSS THE AREA FRIDAY THROUGH SATURDAY MORNING. GUSTY WINDS AND MODERATE TO HEAVY PRECIPITATION IS LIKELY SMALL CRAFT ADVISORIES MAY BE IN EFFECT ALONG WITH ADVISORIES FOR URBAN AND SMALL STREAM FLOODING. FOR SUNDAY NIGHT THROUGH TUESDAY...GUSTY NORTHEAST WINDS ARE POSSIBLE THROUGH AND BELOW CANYONS AND PASSES. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY. CAZ060>062-131145- APPLE AND LUCERNE VALLEYS-COACHELLA VALLEY- SAN DIEGO COUNTY DESERTS- 432 AM PDT THU APR 12 2012 ...HIGH WIND WATCH IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY DAMAGING WINDS AND AREAS OF BLOWING SAND WITH VISIBILITY NEAR ZERO ARE POSSIBLE FROM LATE FRIDAY MORNING THROUGH FRIDAY EVENING AHEAD OF A COLD FRONT. FOR FRIDAY NIGHT THROUGH NEXT TUESDAY...NORMALLY DRY WASHES WILL BE FLOWING DUE TO A COMBINATION OF RUNOFF HEAVY RAINS OVER THE MOUNTAINS FRIDAY NIGHT AND MELTING SNOW AS TEMPERATURES RAPIDLY WARM TO ABOVE NORMAL SUNDAY THROUGH TUESDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY. CAZ055-056-131145- SAN BERNARDINO COUNTY MOUNTAINS-RIVERSIDE COUNTY MOUNTAINS- 432 AM PDT THU APR 12 2012 ...WINTER STORM WATCH IN EFFECT FROM LATE TONIGHT THROUGH LATE FRIDAY NIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EXTREME SOUTHWESTERN CALIFORNIA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED TODAY. LIGHT RAIN WITH SNOW ABOVE 5000 FEET SHOULD BEGIN THIS EVENING. HEAVY RAIN AND SNOW IS FORECAST FOR LATE TONIGHT OVER THE SAN GABRIEL MOUNTAINS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY HEAVY SNOW SPREADING EAST ACROSS THE SAN BERNARDINO MOUNTAINS FRIDAY MORNING...REACHING THE SAN JACINTO MOUNTAINS BY NOON FRIDAY. PERIODS OF HEAVY SNOW MAY CONTINUE INTO FRIDAY NIGHT. FOR SUNDAY NIGHT THROUGH TUESDAY...WEAK TO MODERATE STRENGTH NORTHEAST WINDS EXPECTED THROUGH MOUNTAINS PASSES AND CANYONS AS HIGH PRESSURE BUILDS TO THE NORTH. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY. BALFOUR
In the hours before
Special weather statement, Apr 12, 4:39 AM PDT, 4 hours 46 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>The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 2:40 AM PDT | Winter Storm Watch | SGX | Riverside, San Bernardino | 7 hr |
| Apr 12, 2:55 AM PDT | High Wind Watch | SGX | Riverside, San Bernardino, San Diego | 11 hr |
| Apr 12, 9:25 AM PDT | Winter Storm Warning | SGX | Riverside, San Bernardino, San Diego | 52 hr |
| Apr 12, 12:01 PM PDT | Small Craft Advisory | SGX | 57 hr | |
| Apr 12, 1:36 PM PDT | High Wind Warning | SGX | Riverside, San Bernardino, San Diego | 33 hr |
Nearby
Winter Storm Watches in California, 2012Every winter storm watch 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.