Alert archive / California / Red Flag Warnings in 2008

Red Flag Warning 11, NWS Sacramento, CA

October 9, 2008

NWS Sacramento, CA issued this red flag warning at Oct 9, 2008, 5:18 AM PDT. It took effect at Oct 9, 2008, 11:00 PM PDT. It was in force for 4 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 9, 2008, 5:18 AM PDT (12:18 UTC)
In effect from: Oct 9, 2008, 11:00 PM PDT
Expired: Oct 13, 2008, 7:00 PM PDT
In force: 4 days
Issued by: NWS Sacramento, CA

What forecasters said that day

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

NWS Sacramento, CA wrote its last area forecast discussion before this red flag warning went out at Oct 9, 3:50 AM PDT, 1 hour 28 minutes earlier.

Area forecast discussion, Oct 9, 3:50 AM PDT, 1 hour 28 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SACRAMENTO CA
350 AM PDT THU OCT 9 2008

.DISCUSSION...
A PACIFIC TROUGH CURRENTLY MOVING ONSHORE WILL DEEPEN OVER THE
REGION SIGNIFICANTLY TODAY AND THROUGH SATURDAY. THIS SYSTEM WILL
BRING WINDY CONDITIONS...MUCH COOLER TEMPERATURES...AND A CHANCE OF
LIGHT SNOW OVER THE SOUTHERN CASCADES AND NORTHERN SIERRA NEVADA.
SURFACE HIGH PRESSURE SPREADING INTO THE PACIFIC NORTHWEST TODAY
WILL CREATE A STRONG GRADIENT WITH DEVELOPING LOW PRESSURE OVER THE
GREAT BASIN. THE MFR TO RDD GRADIENT IS ALREADY 9.7 MB. WINDS AT
REDDING HAVE BEGUN TO PICK UP AND ARE CURRENTLY 11 KT GUSTING TO 20
KT. THESE NORTHERLY WINDS WILL INCREASE THIS MORNING AND SPREAD
SOUTHWARD AS THE SURFACE PRESSURE GRADIENT INCREASES. WINDS ALOFT
AND JUST OFF THE SURFACE WILL SUPPORT WINDY AND GUSTY CONDITIONS BY
MID AFTERNOON ACROSS THE SACRAMENTO VALLEY...ESPECIALLY OVER THE
WESTERN SIDE...AND INTO LAKE COUNTY AND THE MOUNTAINS OF
SOUTHWESTERN SHASTA COUNTY. WINDS IN THOSE AREAS WILL AT TIMES REACH
SUSTAINED LEVELS OF 25 MPH WITH GUSTS UP TO 40 MPH...FROM MID
AFTERNOON INTO THE EARLY EVENING. A WIND ADVISORY HAS BEEN ISSUED
FOR 3 PM TO 9 PM FOR THOSE AREAS. THE FIRE WEATHER WATCH HAS BEEN
UPGRADED TO A RED FLAG WARNING FOR GUSTY WINDS AND POOR HUMIDITY
RECOVERIES BELOW 1500 FEET. WINDS ARE EXPECTED TO DIMINISH SOME
AFTER MIDNIGHT TONIGHT...THEN RETURN FRIDAY AFTERNOON AND EVENING. A
WIND ADVISORY MAY BE REQUIRED FOR THAT PERIOD SINCE THE PRESSURE
GRADIENT WILL BE OF SIMILAR STRENGTH WITH CONTINUED UPPER LEVEL
SUPPORT. TEMPERATURES WILL DROP 6-10 DEGREES TODAY AS THE COOLER
AIRMASS MOVES IN. 850 MB TEMPERATURES FALL 8-10 DEGREES C
TODAY...AND SEVERAL MORE DEGREES ON FRIDAY. HIGHS IN THE VALLEY WILL
MAINLY BE IN THE MID TO UPPER 70S TODAY...UPPER 60S TO LOWER 70S ON
FRIDAY. AS THE TROUGH DEEPENS...THE LEFT FRONT OF A 130 KT JET WILL
EXTEND INTO NORTHERN CALIFORNIA. THIS ALONG WITH SUFFICIENT MOISTURE
AND INSTABILITY FROM COLD POOL ALOFT WILL SPREAD LIGHT RAIN AND SNOW
SHOWERS INTO SHASTA COUNTY AFTER MIDNIGHT TONIGHT. SNOW LEVELS WITH
THE COOL AIRMASS WILL DROP TO AROUND 4000 FEET OVERNIGHT. ANY
ACCUMULATIONS ARE EXPECTED TO BE LIGHT. SNOW SHOWERS WILL SPREAD
SOUTHWARD INTO THE LASSEN PARK AREA AND ALONG THE SIERRA CREST.
CURRENT MODEL RUNS SHOW TROUGH WILL CLOSE OFF AND DEEPEN FURTHER ON
FRIDAY INTO EARLY SATURDAY...BUT SHOULD STAY FAR ENOUGH EAST TO KEEP
PRECIPITATION FROM SPREADING WESTWARD TO THE COASTAL MOUNTAINS OF
THE FORECAST AREA. BEST CHANCES OF PRECIPITATION EXPECTED TO BE IN
FAVORED UPSLOPE AREAS EAST OF THE SIERRA CREST. FRIDAY NIGHT SNOW
SHOWERS ON THE WEST SIDE WILL BE MAINLY NEAR THE CREST SOUTH OF
I-80. DRY CONDITIONS WILL MOVE IN FOR SATURDAY AS THE SYSTEM SHIFTS
EASTWARD...ALTHOUGH BREEZY NORTHERLY WINDS WILL CONTINUE. HIGH
TEMPERATURES IN THE VALLEY WILL RISE SLIGHTLY...ALTHOUGH THE
MOUNTAINS WILL REMAIN QUITE COOL ALONG WITH MORE CLOUD COVER.

WARMER WEATHER RETURNS ON SUNDAY AS AN UPPER LEVEL HIGH BUILDS IN.
PRESSURE GRADIENT WILL BECOME MORE NORTHEASTERLY...WITH GUSTY WINDS
OVER RIDGES AND THROUGH CANYONS. NEAR NORMAL TEMPERATURES EXPECTED
BY TUESDAY. A WEAK DISTURBANCE TUESDAY NIGHT SHOULD JUST BRING AN
INCREASE IN CLOUD COVER...WITH CONTINUED DRY CONDITIONS THROUGH THE
REST OF THE WEEK. EK

&&

.AVIATION...
VFR CONDITIONS ARE EXPECTED TO PREVAIL NEXT 36 HRS. A NORTHERLY SFC
PRESSURE GRADIENT WILL BRING NORTHERLY WINDS OF 20-25KT WITH GUSTS
35-40KT. WIND ADV VALID ACROSS SAC VALLEY AND ADJACENT COASTAL MTNS
FROM 09/22Z TO 10/04Z.

&&

.STO WATCHES/WARNINGS/ADVISORIES...RED FLAG WARNING FROM 11 PM PDT
THIS EVENING THROUGH SATURDAY 5 PM PDT FOR THE SACRAMENTO
VALLEY...DELTA REGIONS AND NORTHERN SAN JOAQUIN VALLEY BELOW 1500
FEET FOR GUSTY NORTH WINDS AND LOW HUMIDITY.

WIND ADVISORY FROM 3 PM PDT THIS AFTERNOON TO 9 PM PDT THIS EVENING
FOR THE SACRAMENTO VALLEY...LAKE COUNTY AND THE MOUNTAINS OF
SOUTHWESTERN SHASTA COUNTY.

&&

In the hours before

Special weather statement, Oct 9, 5:11 AM PDT, 7 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 4:49 AM PDT	Wind Advisory	STO		59 hr

Nearby

Red Flag Warnings in California, 2008 Every red flag warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.