Alert archive / California / Frost Advisories in 2013
Frost Advisory 7, NWS Los Angeles, CA
NWS Los Angeles, CA issued this frost advisory at Jan 13, 2013, 9:02 PM PST for Los Angeles County, California. It took effect at Jan 14, 2013, 1:00 AM PST. It was in force for 8 hr.
The area
The counties it named.
The facts
- Issued
- Jan 13, 2013, 9:02 PM PST (05:02 UTC)
- In effect from
- Jan 14, 2013, 1:00 AM PST
- Expired
- Jan 14, 2013, 9:00 AM PST
- In force
- 8 hr
- Issued by
- NWS Los Angeles, CA
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 05:08 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 00:00Z, 5.0 hours before the alert went out and 184 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2013 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Los Angeles, CA wrote its last area forecast discussion before this frost advisory went out at Jan 13, 1:00 PM PST, 8 hours 2 minutes earlier.
Area forecast discussion, Jan 13, 1:00 PM PST, 8 hours 2 minutes before
SOUTHWEST CALIFORNIA AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LOS ANGELES/OXNARD CA 100 PM PST SUN JAN 13 2013 .SYNOPSIS... BLUSTERY OFFSHORE WINDS WILL PERSIST THROUGH TUESDAY. TEMPERATURES WILL REMAIN BELOW NORMAL UNTIL TUESDAY AFTERNOON...WHEN A WARMING TREND SHOULD START. THE WARMING TREND WILL BRING TEMPERATURES TO ABOVE THE SEASONAL NORMALS BY MID WEEK UNDER OFFSHORE FLOW AND HIGH PRESSURE. THE AFTERNOON TEMPERATURES SHOULD REACH A MAXIMUM BY MIDWEEK...WITH A MINOR COOLING TREND OVER THE WEEKEND WITH TEMPERATURES LINGERING AROUND NORMAL. && .SHORT TERM (TONIGHT-WED)...WILL UPGRADE THE HIGH WIND WATCH TO A WARNING OVER THE HIGHER TERRIAN BUT WILL CONTINUE WITH THE WATCH OVER THE VALLEYS. MODERATE LOW LEVEL HEIGHT RISES WILL OCCUR OVER THE GREAT BASIN OVERNIGHT WHICH WILL REINFORCE THE RIDGE OF HIGH PRESSURE ALREADY IN PLACE. AND AS A RESULT NORTHEAST WINDS WILL LIKELY INCREASE TO AND OVER THE WARNING THRESHOLD OVER AREAS OF THE HIGHER TERRAIN BY EARLY MONDAY MORNING. A PERSISTENT LONG WAVE TROUGH CENTERED JUST EAST OF THE AREA WILL SHIFT EAST AS A LONG WAVE RIDGE OVER THE EASTERN PACIFIC BEGINS TO SHIFT INLAND MONDAY. AND SIGNIFICANT MID/UPPER LEVEL HEIGHT RISES WILL BUILD OVER THE GREAT BASIN WHICH WILL LIKELY REINFORCE AND STRENGTHEN THE NORTHEAST WINDS OVER THE AREA MONDAY AFTERNOON. THE REINFORCED WINDS WILL LIKELY DESCEND TO THE LOWER ELEVATIONS AND POSSIBLY EXCEED WARNING THRESHOLDS MONDAY AFTERNOON THROUGH TUESDAY MORNING. OTHERWISE LITTLE CHANGE IS EXPECTED BETWEEN THE LOW TEMPERATURES THIS MORNING AND TEMPERATURES MONDAY MORNING WHERE FREEZE WARNINGS ARE IN EFFECT FOR THE COASTAL SECTIONS OF SLO AND SBA COUNTIES AS WELL AS SANTA YNEZ AND OJAI VALLEYS TONIGHT. AND A WATCH CONTINUES MONDAY NIGHT THROUGH TUESDAY MORNING FOR THE AFOREMENTIONED AREAS. .LONG TERM (THU-SUN)...THE AIR MASS WILL MODERATE AS HIGH PRESSURE SETTLES OVER THE AREA AND PERSISTS THROUGH THE PERIOD. DRY CONDITIONS WILL PREVAIL AND TEMPERATURES WILL WARM AND LIKELY BE 3 TO 5 DEGREES ABOVE NORMAL BY THURSDAY...AND LITTLE CHANGE IS EXPECTED THEREAFTER. && .AVIATION...13/1800Z. VFR CONDITIONS WILL CONTINUE AT ALL TAF SITES THROUGH MONDAY. BY MONDAY MORNING...MANY TAF SITES VULNERABLE TO SANTA ANA WINDS WILL DEAL WITH THE POSSIBILITY OF LOW LEVEL WIND SHEAR AND TURBULENCE. KLAX AND KBUR...HIGH CONFIDENCE IN VFR CONDITIONS THROUGH MONDAY. LOW LEVEL WIND SHEAR AND TURBULENCE ARE POSSIBLE AFTER SUNRISE. && .LOX WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING (SEE LAXNPWLOX). FREEZE WARNING (SEE LAXNPWLOX). HIGH WIND WATCH (SEE LAXNPWLOX). FREEZE WATCH (SEE LAXNPWLOX). GALE WARNING (SEE LAXMWWLOX). SMALL CRAFT ADVISORY (SEE LAXMWWLOX). && PUBLIC...30 AVIATION...SWEET SYNOPSIS...SETO WWW.WEATHER.GOV/LOSANGELES
Hazardous weather outlook, Jan 13, 2:00 PM PST, 7 hours 2 minutes before
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</html>The office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 14, 4:11 AM PST | Freeze Warning | LOX | 29 hr | |
| Jan 14, 2:39 PM PST | Frost Advisory | LOX | Los Angeles | 18 hr |
Nearby
Frost Advisories in California, 2013Every frost advisory in 2013
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.