Alert archive / California / Mesoscale Discussions in 2006

Mesoscale Discussion 21

January 2, 2006Tuolumne County, California

The Storm Prediction Center issued this mesoscale discussion at Jan 2, 2006, 11:07 AM PST for Tuolumne County, California. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Jan 2, 2006, 11:07 AM PST (19:07 UTC)
Expired
Jan 2, 2006, 4:00 PM PST
In force
5 hr
Issued by
the Storm Prediction Center

County Tuolumne County, CA

The radar

The San Joaquin Valley radar (KHNX), 156 km from the middle of the area, began a volume at 19:08 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

Oakland, CA (KOAK), launched 12:00Z, 7.1 hours before the alert went out and 234 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 2006-01-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 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 2006-01-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.1939587897117Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
729 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
117 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 
ACUS11 KWNS 021908
SWOMCD
SPC MCD 021907 
CAZ000-030000-

MESOSCALE DISCUSSION 0021
NWS STORM PREDICTION CENTER NORMAN OK
0107 PM CST MON JAN 02 2006

AREAS AFFECTED...SOUTHERN SIERRA MOUNTAINS

CONCERNING...HEAVY SNOW 

VALID 021907Z - 030000Z

HEAVY SNOW WILL CONTINUE ACROSS THE SOUTHERN SIERRA MOUNTAINS
THROUGH THE AFTERNOON. SNOW RATES OF 2-3 IN/HR WILL REMAIN
POSSIBLE...ESPECIALLY INTO W/SW FACING SLOPES ABOVE 6500-7000 FT.

WATER VAPOR IMAGERY DEPICTS SHORTWAVE TROUGH MOVING EWD NEAR THE
CENTRAL CA COAST...WITH DRY SLOT ADVECTING NE ACROSS INTERIOR
CENTRAL CA. ACROSS THE SIERRA MOUNTAINS...LATEST MESONET
OBSERVATIONS SUGGESTS SNOW LEVELS ARE AROUND 6500-7000 FT. DPVA AND
OROGRAPHIC LIFT COMBINED WITH STEEPENING MID LEVEL LAPSE RATES/HIGH
PW ENVIRONMENT WILL CONTINUE THE COPIOUS HIGHER ELEVATION SNOWFALL
THROUGH THE AFTERNOON...WITH 2-3 IN/HR SNOW RATES POSSIBLE.

..GUYER.. 01/02/2006

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...VEF...REV...HNX...STO...

38712028 38561968 37221837 36241816 36251881 37191930
37801992 38082027 38362038

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 2, 4:01 AM PSTMesoscale DiscussionSPCMono6 hr

Nearby

Mesoscale Discussions in California, 2006Every mesoscale discussion in 2006

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.