Alert archive / California / Red Flag Warnings in 2011
Red Flag Warning 4, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this red flag warning at Oct 31, 2011, 9:52 AM PDT. It took effect at Nov 1, 2011, 6:00 AM PDT. It was in force for 27 hr. 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 31, 2011, 9:52 AM PDT (16:52 UTC)
- In effect from
- Nov 1, 2011, 6:00 AM PDT
- Expired
- Nov 2, 2011, 9:00 AM PDT
- In force
- 27 hr
- Issued by
- NWS San Francisco Bay Area, CA
The text
As transmitted, in the capitals the NWS used until 2016.
704 WWUS86 KMTR 311652 RFWMTR URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 952 AM PDT MON OCT 31 2011 ...RED FLAG WARNING IN EFFECT FOR THE NORTH AND EAST BAY HILLS FROM 6 AM TUESDAY MORNING THROUGH 6 AM WEDNESDAY MORNING... .AN UPPER LEVEL TROUGH WILL DIG INTO THE GREAT BASIN TONIGHT INTO EARLY TUESDAY. IN THE WAKE OF THIS TROUGH A SURFACE HIGH WILL RAPIDLY BUILD OVER THE PACIFIC NORTHWEST AND NORTHERN NEVADA. THIS WILL RESULT IN MODERATE TO STRONG NORTH TO NORTHEAST WINDS OVER THE NORTH AND EAST BAY HILLS FROM TUESDAY MORNING THROUGH WEDNESDAY MORNING. AT THE SAME TIME...MUCH DRIER AIR WILL MOVE INTO THE AREA...RESULTING IN VERY POOR TO NO RELATIVE HUMIDITY RECOVERIES TUESDAY NIGHT ACROSS THE HILLS OF THE NORTH AND EAST BAY. WINDS ARE FORECAST TO RAPIDLY DIMINISH AFTER SUNRISE WEDNESDAY AS ONSHORE FLOW RETURNS. CAZ507-511-312300- /O.UPG.KMTR.FW.A.0004.111101T1300Z-111102T1800Z/ /O.NEW.KMTR.FW.W.0004.111101T1300Z-111102T1300Z/ NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE- 952 AM PDT MON OCT 31 2011 ...RED FLAG WARNING IN EFFECT FROM 6 AM TUESDAY TO 6 AM PDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTH AND EAST BAY HILLS... THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT FROM 6 AM TUESDAY TO 6 AM PDT WEDNESDAY. * AFFECTED AREA...THE NORTH AND EAST BAY HILLS ABOVE 1000 FEET. * WINDS...NORTH TO NORTHEAST WINDS 15 TO 25 MPH WITH FREQUENT GUSTS 35 TO 40 MPH. STRONGEST WINDS EXPECTED DURING THE PEAK HEATING HOURS OF TUESDAY AFTERNOON AND EVENING. * RELATIVE HUMIDITY...BETWEEN 30-45 PERCENT EARLY TUESDAY MORNING LOWER TO 15-20% TUESDAY AFTERNOON WITH LITTLE OR NO RELATIVE HUMIDITY RECOVERY THROUGH WEDNESDAY MORNING. * IMPACTS...ANY FIRE STARTS DURING THE PERIOD OF STRONG WINDS AND LOW HUMIDITY WILL BE DIFFICULT TO SUPPRESS WITH RAPID RATES OF SPREAD. PRESCRIBED AND BACKYARD BURNERS SHOULD USE EXTREME CAUTION DURING THIS RED FLAG EVENT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SANFRANCISCO (ALL LOWER CASE)
6 follow-up statements
437 WWUS86 KMTR 312117 RFWMTR URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 217 PM PDT MON OCT 31 2011 ...RED FLAG WARNING IN EFFECT FOR THE NORTH AND EAST BAY HILLS FROM 6 AM TUESDAY MORNING THROUGH 6 AM WEDNESDAY MORNING... .AN UPPER LEVEL TROUGH WILL DIG INTO THE GREAT BASIN TONIGHT INTO EARLY TUESDAY. IN THE WAKE OF THIS TROUGH A SURFACE HIGH WILL RAPIDLY BUILD OVER THE PACIFIC NORTHWEST AND NORTHERN NEVADA. THIS WILL RESULT IN MODERATE TO STRONG NORTH TO NORTHEAST WINDS OVER THE NORTH AND EAST BAY HILLS FROM TUESDAY MORNING THROUGH WEDNESDAY MORNING. AT THE SAME TIME...MUCH DRIER AIR WILL MOVE INTO THE AREA...RESULTING IN VERY POOR TO NO RELATIVE HUMIDITY RECOVERIES TUESDAY NIGHT ACROSS THE HILLS OF THE NORTH AND EAST BAY. WINDS ARE FORECAST TO RAPIDLY DIMINISH AFTER SUNRISE WEDNESDAY AS ONSHORE FLOW RETURNS. CAZ507-511-011300- /O.CON.KMTR.FW.W.0004.111101T1300Z-111102T1300Z/ NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE- 217 PM PDT MON OCT 31 2011 ...RED FLAG WARNING REMAINS IN EFFECT FROM 6 AM TUESDAY TO 6 AM PDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTH AND EAST BAY HILLS... A RED FLAG WARNING REMAINS IN EFFECT FROM 6 AM TUESDAY TO 6 AM PDT WEDNESDAY. * AFFECTED AREA...THE NORTH AND EAST BAY HILLS ABOVE 1000 FEET. THE STRONGEST WINDS WILL INITIALLY ARRIVE IN THE NAPA COUNTY HILLS BY EARLY TUESDAY AND THEN SPREAD INTO THE EAST BAY HILLS DURING THE DAY TUESDAY. BY LATER TUESDAY AFTERNOON AND EVENING THE OFFSHORE WINDS WILL REACH THE COASTAL HILLS OF MARIN AND SONOMA COUNTY. * WINDS...NORTH TO NORTHEAST WINDS 15 TO 25 MPH WITH FREQUENT GUSTS 35 TO 40 MPH. STRONGEST WINDS EXPECTED DURING THE PEAK HEATING HOURS OF TUESDAY AFTERNOON AND EVENING. * RELATIVE HUMIDITY...BETWEEN 30-45 PERCENT EARLY TUESDAY MORNING LOWERING TO 15-20% TUESDAY AFTERNOON WITH LITTLE OR NO RELATIVE HUMIDITY RECOVERY THROUGH WEDNESDAY MORNING. * IMPACTS...ANY FIRE STARTS DURING THE PERIOD OF STRONG WINDS AND LOW HUMIDITY WILL BE DIFFICULT TO SUPPRESS WITH RAPID RATES OF SPREAD. PRESCRIBED AND BACKYARD BURNERS SHOULD USE EXTREME CAUTION DURING THIS RED FLAG EVENT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SANFRANCISCO (ALL LOWER CASE)
219 WWUS86 KMTR 011116 RFWMTR URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 416 AM PDT TUE NOV 1 2011 ...RED FLAG WARNING IN EFFECT FOR THE NORTH AND EAST BAY HILLS FROM THROUGH 6 AM WEDNESDAY MORNING... .STRONG NORTHERLY WINDS ARE ALREADY DEVELOPING ACROSS THE NORTH AND EAST BAY HILLS EARLY THIS MORNING. NORTH TO NORTHEAST WINDS WILL CONTINUE TO INCREASE THROUGH THE DAY AS HUMIDITY VALUES CONTINUE TO DRY OUT. THE STRONGEST WINDS WILL END BY THIS EVENING BUT VERY DRY AIR WILL STAY IN PLACE AT LEAST THROUGH WEDNESDAY MORNING. CAZ507-511-012315- /O.CON.KMTR.FW.W.0004.111101T1300Z-111102T1300Z/ NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE- 416 AM PDT TUE NOV 1 2011 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 AM PDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTH AND EAST BAY HILLS... A RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 AM PDT WEDNESDAY. * AFFECTED AREA...THE NORTH AND EAST BAY HILLS ABOVE 1000 FEET. THE STRONGEST WINDS WILL INITIALLY ARRIVE IN THE NAPA COUNTY HILLS EARLY THIS MORNING AND THEN SPREAD INTO THE EAST BAY HILLS DURING THE MID-MORNING HOURS. BY THIS AFTERNOON THE OFFSHORE WINDS WILL REACH THE COASTAL HILLS OF MARIN AND SONOMA COUNTY. * WINDS...NORTH 15 TO 25 MPH WITH FREQUENT GUSTS 35 TO 40 MPH. * RELATIVE HUMIDITY...30 TO 40 PERCENT AT SUNRISE...LOWERING 12 TO 25 PERCENT THROUGH THE DAY WITH LITTLE OR NO HUMIDITY RECOVERY TONIGHT. * IMPACTS...ANY FIRE STARTS DURING THE PERIOD OF STRONG WINDS AND LOW HUMIDITY WILL BE DIFFICULT TO SUPPRESS WITH RAPID RATES OF SPREAD. PRESCRIBED AND BACKYARD BURNERS SHOULD USE EXTREME CAUTION DURING THIS RED FLAG EVENT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SANFRANCISCO (ALL LOWER CASE)
926 WWUS86 KMTR 012317 RFWMTR URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 417 PM PDT TUE NOV 1 2011 ...RED FLAG WARNING IN EFFECT FOR THE NORTH AND EAST BAY HILLS FROM THROUGH 6 AM WEDNESDAY MORNING... .STRONG NORTHERLY WINDS WILL CONTINUE ACROSS THE NORTH AND EAST BAY HILLS THROUGH THIS AFTERNOON AND EARLY EVENING AS HUMIDITY VALUES CONTINUE TO DROP. WINDS WILL GRADUALLY DIMINISH OVERNIGHT BUT VERY DRY AIR WILL STAY IN PLACE AT LEAST THROUGH WEDNESDAY MORNING. CAZ507-511-020730- /O.CON.KMTR.FW.W.0004.000000T0000Z-111102T1300Z/ NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE- 417 PM PDT TUE NOV 1 2011 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 AM PDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTH AND EAST BAY HILLS... A RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 AM PDT WEDNESDAY. * AFFECTED AREA...THE NORTH AND EAST BAY HILLS ABOVE 1000 FEET. STRONG WINDS WILL CONTINUE ACROSS THE NORTH AND EAST BAY HILLS THROUGH THIS AFTERNOON AND EARLY EVENING AS HUMIDITY VALUES CONTINUE TO DROP. WINDS WILL GRADUALLY DIMINISH OVERNIGHT. * WINDS...NORTH 15 TO 25 MPH WITH GUSTS UP TO 45 MPH. * RELATIVE HUMIDITY...AS LOW AS 15 PERCENT. * IMPACTS...ANY FIRE STARTS DURING THE PERIOD OF STRONG WINDS AND LOW HUMIDITY WILL BE DIFFICULT TO SUPPRESS WITH RAPID RATES OF SPREAD. PRESCRIBED AND BACKYARD BURNERS SHOULD USE EXTREME CAUTION DURING THIS RED FLAG EVENT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SANFRANCISCO (ALL LOWER CASE)
831 WWUS86 KMTR 012319 AAA RFWMTR URGENT - FIRE WEATHER MESSAGE...UPDATED NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 419 PM PDT TUE NOV 1 2011 ...RED FLAG WARNING IN EFFECT FOR THE NORTH AND EAST BAY HILLS FROM THROUGH 6 AM WEDNESDAY MORNING... .STRONG NORTHERLY WINDS WILL CONTINUE ACROSS THE NORTH AND EAST BAY HILLS THROUGH THIS AFTERNOON AND EARLY EVENING AS HUMIDITY VALUES CONTINUE TO DROP. WINDS WILL GRADUALLY DIMINISH OVERNIGHT BUT VERY DRY AIR WILL STAY IN PLACE AT LEAST THROUGH WEDNESDAY MORNING. CAZ507-511-021300- /O.CON.KMTR.FW.W.0004.000000T0000Z-111102T1300Z/ NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE- 419 PM PDT TUE NOV 1 2011 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 AM PDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTH AND EAST BAY HILLS... A RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 AM PDT WEDNESDAY. * AFFECTED AREA...THE NORTH AND EAST BAY HILLS ABOVE 1000 FEET. STRONG WINDS WILL CONTINUE ACROSS THE NORTH AND EAST BAY HILLS THROUGH THIS AFTERNOON AND EARLY EVENING AS HUMIDITY VALUES CONTINUE TO DROP. WINDS WILL GRADUALLY DIMINISH OVERNIGHT. * WINDS...NORTH 15 TO 25 MPH WITH GUSTS UP TO 45 MPH. * RELATIVE HUMIDITY...AS LOW AS 15 PERCENT. * IMPACTS...ANY FIRE STARTS DURING THE PERIOD OF STRONG WINDS AND LOW HUMIDITY WILL BE DIFFICULT TO SUPPRESS WITH RAPID RATES OF SPREAD. PRESCRIBED AND BACKYARD BURNERS SHOULD USE EXTREME CAUTION DURING THIS RED FLAG EVENT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SANFRANCISCO (ALL LOWER CASE)
002 WWUS86 KMTR 021224 RFWMTR URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 524 AM PDT WED NOV 2 2011 .GUSTY NORTHEAST WINDS WILL CONTINUE THROUGH THE EARLY MORNING HOURS ALONG WITH VERY DRY AIR. WINDS WILL DECREASE AFTER MID MORNING AND BECOME ONSHORE BY LATE AFTERNOON AND THIS EVENING. CAZ507-511-021600- /O.EXT.KMTR.FW.W.0004.000000T0000Z-111102T1600Z/ NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE- 524 AM PDT WED NOV 2 2011 ...RED FLAG WARNING NOW IN EFFECT UNTIL 9 AM PDT THIS MORNING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE NORTH AND EAST BAY HILLS... THE RED FLAG WARNING IS NOW IN EFFECT UNTIL 9 AM PDT THIS MORNING. * AFFECTED AREA...THE NORTH AND EAST BAY HILLS ABOVE 1000 FEET. GUSTY WINDS WILL CONTINUE ACROSS THE NORTH AND EAST BAY HILLS THROUGH THE EARLY MORNING HOURS ALONG WITH VERY LOW HUMIDITY VALUES. WINDS WILL DECREASE AFTER MID MORNING AND BECOME ONSHORE BY LATE AFTERNOON AND THIS EVENING. * WINDS...NORTH TO NORTHEAST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH. * RELATIVE HUMIDITY...AS LOW AS 15 PERCENT. * IMPACTS...ANY FIRE STARTS DURING THE PERIOD OF STRONG WINDS AND LOW HUMIDITY WILL BE DIFFICULT TO SUPPRESS WITH RAPID RATES OF SPREAD. PRESCRIBED AND BACKYARD BURNERS SHOULD USE EXTREME CAUTION DURING THIS RED FLAG EVENT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. && $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SANFRANCISCO (ALL LOWER CASE)
796 WWUS86 KMTR 021600 RFWMTR URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 900 AM PDT WED NOV 2 2011 ...RED FLAG WARNING EXPIRES AT 9 AM THIS MORNING FOR THE NORTH AND EAST BAY HILLS... .THE PERIOD OF STRONGEST WINDS HAS PEAKED AND WIND SPEEDS WILL GRADUALLY DECREASE THROUGH THE REST OF THIS MORNING BEFORE WINDS SWITCH DIRECTION AND TURN ONSHORE. CAZ507-511-021700- /O.EXP.KMTR.FW.W.0004.000000T0000Z-111102T1600Z/ NORTH BAY MOUNTAINS-EAST BAY HILLS AND DIABLO RANGE- 900 AM PDT WED NOV 2 2011 ...RED FLAG WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING FOR GUSTY WINDS AND LOW HUMIDITY FOR THE NORTH AND EAST BAY HILLS... THE RED FLAG WARNING WILL EXPIRE AT 9 AM PDT THIS MORNING. GUSTY NORTHEAST WINDS WILL CONTINUE TO DECREASE THE REST OF THIS MORNING. BY MIDDAY WINDS WILL SWITCH BACK TO ONSHORE AND HUMIDITY VALUES WILL SLOWLY RECOVER THROUGH THIS AFTERNOON AND EVENING. EVEN THOUGH THE PERIOD OF STRONGEST WINDS AND LOWEST HUMIDITY HAS ENDED FIRE WEATHER INTERESTS SHOULD CONTINUE TO MONITOR THE LATEST FORECASTS. A STRONG COLD FRONT WILL MOVE THROUGH THE DISTRICT FROM NORTH TO SOUTH THURSDAY AFTERNOON WITH SHOWERS...MUCH COLDER TEMPERATURES AND GUSTY NORTHWEST WINDS. $$ FOR MORE INFORMATION FROM NOAA/NATIONAL WEATHER SERVICE VISIT... HTTP://WEATHER.GOV/SANFRANCISCO (ALL LOWER CASE)
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 30, 8:16 PM PDT | Gale Warning | MTR | 42 hr | |
| Oct 31, 2:55 AM PDT | Dense Fog Advisory | MTR | Monterey, San Benito, Santa Cruz | 6 hr |
Nearby
Red Flag Warnings in California, 2011Every red flag warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.