Alert archive / California / Red Flag Warnings in 2007
Red Flag Warning 4, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this red flag warning at Nov 22, 2007, 4:38 PM PST for Riverside County, California. It took effect at Nov 23, 2007, 12:00 AM PST. It was in force for 28 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
- Nov 22, 2007, 4:38 PM PST (00:38 UTC)
- In effect from
- Nov 23, 2007, 12:00 AM PST
- Expired
- Nov 24, 2007, 4:00 AM PST
- In force
- 28 hr
- Issued by
- NWS San Francisco Bay Area, CA
County Riverside County, CA
The radar
The San Diego radar (KNKX), 134 km from the middle of the area, began a volume at 00:41 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, 0.6 hours before the alert went out and 154 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
- 1015 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -99 m²/s²
- 0-3 km storm-relative helicity
- -28 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS86 KMTR 230038 RFWMTR RED FLAG WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 438 PM PST THU NOV 22 2007 CAZ207-230145- /O.CAN.KMTR.FW.A.0004.071123T1200Z-071124T1200Z/ THE EAST BAY HILLS- 438 PM PST THU NOV 22 2007 ...FIRE WEATHER WATCH IS CANCELLED... THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS CANCELED THE FIRE WEATHER WATCH. HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE PACIFIC NORTHWEST AND NORTHERN GREAT BASIN TONIGHT AND FRIDAY...WHILE A WEAK TROUGH OF LOW PRESSURE PERSISTS ALONG THE COAST. AS A RESULT...NORTHEAST WINDS ARE EXPECTED TO INCREASE OVER THE EAST BAY HILLS LATE TONIGHT AND FRIDAY...AND BRING LOW RELATIVE HUMIDITIES. HOWEVER... FUEL MOISTURE VALUES APPEAR TO BE SUFFICIENT TO KEEP CONDITIONS FROM REACHING CRITICAL LEVELS. $$ CAZ265-231245- /O.UPG.KMTR.FW.A.0004.071123T1200Z-071124T1200Z/ /O.NEW.KMTR.FW.W.0004.071123T0800Z-071124T1200Z/ NAPA COUNTY- 438 PM PST THU NOV 22 2007 ...RED FLAG WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM PST SATURDAY... ...FIRE WEATHER WATCH NO LONGER IN EFFECT... THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT FROM MIDNIGHT TONIGHT TO 4 AM PST SATURDAY. THE FIRE WEATHER WATCH IS NO LONGER IN EFFECT. HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE PACIFIC NORTHWEST AND NORTHERN GREAT BASIN TONIGHT AND FRIDAY...WHILE A WEAK TROUGH OF LOW PRESSURE PERSISTS IN THE VICINITY OF THE COAST. AS A RESULT...NORTHEAST WINDS WILL INCREASE OVER THE NAPA COUNTY HILLS BEGINNING LATE TONIGHT...REACHING SPEEDS OF 20 TO 35 MPH WITH LOCAL GUSTS TO 45 MPH ON FRIDAY. THESE STRONG WINDS ARE EXPECTED TO CONTINUE THROUGH FRIDAY NIGHT. IN ADDITION...RELATIVE HUMIDITIES WILL LOWER IN RESPONSE TO THE DRY NORTHEAST FLOW. THE COMBINATION OF STRONG WINDS...VERY LOW RELATIVE HUMIDITIES AND RELATIVELY LOW FUEL MOISTURE CONTENT WILL CREATE CRITICAL FIRE WEATHER CONDITIONS. A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. $$ BLIER
6 follow-up statements
000 WWUS86 KMTR 231231 RFWMTR RED FLAG WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 431 AM PST FRI NOV 23 2007 CAZ265-240000- /O.CON.KMTR.FW.W.0004.000000T0000Z-071124T1200Z/ NAPA COUNTY- 431 AM PST FRI NOV 23 2007 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 AM PST SATURDAY FOR GUSTY OFFSHORE WINDS AND DRY RELATIVE HUMIDITY VALUES... HIGH PRESSURE WILL CONTINUE TO BUILD INTO THE PACIFIC NORTHWEST AND NORTHERN GREAT BASIN TODAY...WHILE A WEAK TROUGH OF LOW PRESSURE PERSISTS IN THE VICINITY OF THE COAST. AS A RESULT...NORTHEAST WINDS WILL INCREASE OVER THE NAPA COUNTY HILLS THIS MORNING REACHING SPEEDS OF 20 TO 35 MPH WITH LOCAL GUSTS TO 45 MPH. THESE STRONG WINDS ARE EXPECTED TO CONTINUE THROUGH TONIGHT. IN ADDITION...RELATIVE HUMIDITIES WILL LOWER IN RESPONSE TO THE DRY NORTHEAST FLOW. THE COMBINATION OF STRONG WINDS...VERY LOW RELATIVE HUMIDITIES AND RELATIVELY LOW FUEL MOISTURE CONTENT WILL CREATE CRITICAL FIRE WEATHER CONDITIONS. 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. $$ ANDERSON
000 WWUS86 KMTR 232359 RFWMTR RED FLAG WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 359 PM PST FRI NOV 23 2007 CAZ265-240800- /O.CON.KMTR.FW.W.0004.000000T0000Z-071124T1200Z/ NAPA COUNTY- 359 PM PST FRI NOV 23 2007 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 AM PST SATURDAY FOR MODERATE OFFSHORE WINDS AND EXTREMELY LOW OVERNIGHT RELATIVE HUMIDITIES... THE OFFSHORE PRESSURE GRADIENT WILL GRADUALLY WEAKEN OVER THE COMING HOURS...AND RESULT IN SOME REDUCTION IN WIND SPEEDS. NORTHEAST WINDS OF 10 TO 20 MPH WITH LOCAL GUSTS TO 30 MPH ARE EXPECTED IN THE HILLS OVERNIGHT. IN ADDITION...RELATIVE HUMIDITIES WILL REMAIN EXTREMELY LOW...LESS THAN 20% AND LOCALLY AS LOW AS 10% THROUGH THE OVERNIGHT HOURS. THE COMBINATION OF MODERATE AND LOCALLY GUSTY WINDS...VERY LOW RELATIVE HUMIDITIES AND RELATIVELY LOW FUEL MOISTURE CONTENT WILL CREATE CRITICAL FIRE WEATHER CONDITIONS. A RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 AM PST SATURDAY A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. $$ BLIER
000 WWUS86 KMTR 240459 RFWMTR RED FLAG WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 859 PM PST FRI NOV 23 2007 CAZ265-241200- /O.CON.KMTR.FW.W.0004.000000T0000Z-071124T1200Z/ NAPA COUNTY- 859 PM PST FRI NOV 23 2007 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 AM PST SATURDAY FOR LOCALLY MODERATE OFFSHORE WINDS AND EXTREMELY LOW OVERNIGHT RELATIVE HUMIDITIES... WIND SPEEDS IN THE HILLS ARE REDUCING AS THE OFFSHORE PRESSURE GRADIENT CONTINUES TO GRADUALLY WEAKEN. NORTHEAST WINDS OF 10 TO 15 MPH WITH LOCAL GUSTS TO 25 MPH ARE EXPECTED IN THE HILLS OVERNIGHT. HOWEVER...RELATIVE HUMIDITIES WILL REMAIN EXTREMELY LOW...LESS THAN 20% AND LOCALLY AS LOW AS 10-12% THROUGH THE OVERNIGHT HOURS. THE COMBINATION OF MODERATE AND LOCALLY GUSTY WINDS...VERY LOW RELATIVE HUMIDITIES AND RELATIVELY LOW FUEL MOISTURE CONTENT WILL CREATE CRITICAL FIRE WEATHER CONDITIONS. A RED FLAG WARNING REMAINS IN EFFECT UNTIL 4 AM PST SATURDAY 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. $$ BLIER
000 WWUS86 KMTR 241211 RFWMTR RED FLAG WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 411 AM PST SAT NOV 24 2007 CAZ265-242000- /O.EXP.KMTR.FW.W.0004.000000T0000Z-071124T1200Z/ /O.NEW.KMTR.FW.W.0005.071124T1211Z-071124T2100Z/ NAPA COUNTY- 411 AM PST SAT NOV 24 2007 ...RED FLAG WARNING IN EFFECT UNTIL 1 PM PST THIS AFTERNOON... ...RED FLAG WARNING HAS EXPIRED... A COMBINATION OF VERY LOW HUMIDITIES AND LOCALLY BREEZY WINDS HAVE CAUSED RED FLAG CONDITIONS TO CONTINUE THIS MORNING. THE OFFSHORE FLOW WAS WEAKENING THIS MORNING AND WILL CONTINUE TO DO SO THROUGHOUT THE DAY. THIS WILL CAUSE THE WINDS TO BE MAINLY LIGHT FROM THIS AFTERNOON INTO SUNDAY WITH SLIGHT IMPROVEMENTS IN HUMIDITY EXPECTED. A RED FLAG WARNING REMAINS IN EFFECT UNTIL NOON PST SATURDAY A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL CREATE EXPLOSIVE FIRE GROWTH POTENTIAL. $$
000 WWUS86 KMTR 241211 CCA RFWMTR RED FLAG WARNING...CORRECTED NATIONAL WEATHER SERVICE SAN FRANCISCO CA 411 AM PST SAT NOV 24 2007 CAZ265-242000- /O.EXP.KMTR.FW.W.0004.000000T0000Z-071124T1200Z/ /O.NEW.KMTR.FW.W.0005.071124T1211Z-071124T2100Z/ NAPA COUNTY- 411 AM PST SAT NOV 24 2007 ...RED FLAG WARNING IN EFFECT UNTIL NOON PST THIS AFTERNOON... A COMBINATION OF VERY LOW HUMIDITIES AND LOCALLY BREEZY WINDS HAVE CAUSED RED FLAG CONDITIONS TO CONTINUE THIS MORNING. THE OFFSHORE FLOW WAS WEAKENING THIS MORNING AND WILL CONTINUE TO DO SO THROUGHOUT THE DAY. THIS WILL CAUSE THE WINDS TO BE MAINLY LIGHT FROM THIS AFTERNOON INTO SUNDAY WITH SLIGHT IMPROVEMENTS IN HUMIDITY EXPECTED. A RED FLAG WARNING REMAINS IN EFFECT UNTIL NOON PST SATURDAY 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. $$
000 WWUS86 KMTR 241259 CCB RFWMTR RED FLAG WARNING...CORRECTED NATIONAL WEATHER SERVICE SAN FRANCISCO CA 411 AM PST SAT NOV 24 2007 CAZ265-242000- /O.EXP.KMTR.FW.W.0004.000000T0000Z-071124T1200Z/ /O.NEW.KMTR.FW.W.0005.071124T1211Z-071124T2100Z/ NAPA COUNTY- 411 AM PST SAT NOV 24 2007 ...RED FLAG WARNING IN EFFECT UNTIL NOON PST THIS AFTERNOON... A COMBINATION OF VERY LOW HUMIDITIES AND LOCALLY BREEZY WINDS HAVE CAUSED RED FLAG CONDITIONS TO CONTINUE THIS MORNING. THE OFFSHORE FLOW WAS WEAKENING THIS MORNING AND WILL CONTINUE TO DO SO THROUGHOUT THE DAY. THIS WILL CAUSE THE WINDS TO BE MAINLY LIGHT FROM THIS AFTERNOON INTO SUNDAY WITH SLIGHT IMPROVEMENTS IN HUMIDITY EXPECTED. A RED FLAG WARNING REMAINS IN EFFECT UNTIL NOON PST SATURDAY A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF LOCALLY BREEZY WINDS AND VERY LOW RELATIVE HUMIDITIES WILL CREATE FIRE GROWTH POTENTIAL. $$
Nearby
Red Flag Warnings in California, 2007Every red flag warning in 2007
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.