Latest LA area simulation

54 hour simulation for Southern California using WRF v.3.4.1 on Mac OS X, commencing at 4 AM PST (5 AM PDT) on the date shown in the upper left corner of the forecast plots. Most of the pictures below show the 3 PM PST (4 PM PDT) forecasts for Days 1 and 2. Clicking on most pictures generate animations or larger sized images.

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This is ensemble member 4.

Experimental wind and humidity measures

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Maximum 10 m wind speed (mph) Minimum near-surface relative humidity (%)
wsmax rhmin
Maximum dew point depression at 2 m (deg. C) Maximum SAII index
tddmax saiim
New Santa Ana index time series SLP difference Daggett-LAX Dewpoint depression at LAX
wrf_slpdif wrf_slpdif wrf_lax_tdd

More plots:
850 mb max wind   min RH
950 mb max wind   min RH
Drying ratio

Time-height plots at LAX

Click image to enlarge in new window

Near-surface air temperature and winds

3 PM PST (4 PM PDT) forecast of 2 m temperature and 10 m winds is shown for Days 1 and 2. Animations open in new windows.

54 hour animation (click here)

54 hour frame-by-frame animation (click here)

Day 1 (11h forecast) Day 2 (35h forecast)

Low-level relative humidity and winds at 750 m

3 PM PST (4 PM PDT) forecast shown for Days 1 and 2. Animation opens in a new window.

54 hour animation (click here)

Day 1 (11h forecast) Day 2 (35h forecast)

Precipitation

Forecast precipitation accumulation. Clicking on image will spawn hourly animation in new window.
precip accum

Vertical cross-sections

Basemap for these vertical cross-sections

Cross-section "A": West to east from the Channel Islands past the Banning area, showing winds and temperatures (in Celsius) at 3 PM PST (4 PM PDT) on Day 2 over the lowest 3 km. Clicking on image will spawn hourly animation in a new window.
cross section

Cross-section "B": As above, but southwest-to-northeast crossing San Nicolas Is to near Mojave. Cross-sections "A" and "B" intersect near Pt. Dume. Clicking on image will spawn hourly animation in a new window.
cross section

Cross-section "C": Northwest to southeast across the Tehachapi Mtns to the San Bernardinos. Shown is a clear air turbulence index along with winds. Clicking on image will spawn hourly a nimation in a new window.
cross section

Precipitable water and 4 km winds for Domains 2 and 3

Precipitable water (in millimeters) and 4 km winds at 3 OM PST (4 PM PDT) for Day 2. Clicking on images will spawn hourly animations in new windows.

Domain 2 Domain 3
precipitable water D2 preciptable water D3

Lifting condensation level (LCL) for Domain 2

Lifting condensation level (in meters) at 3 PM PST (4 PM PDT) on Day 2. Clicking on image will spawn hourly animation in a new window.
LCL D3

Plots for Pasadena

Click for larger versions in new windows

Time-height plots for temperature, RH and wind (sigma levels below about 600 mb only; grey contours are height MSL in meters)
Time series of 2 m temperature (F), RH (%), wind speed (kts) and wind direction (degrees CW from N)

Time series plots for selected locations

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Other plots

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Page created by Robert Fovell