Alert archive / Colorado / Red Flag Warnings in 2011
Red Flag Warning 1, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Feb 28, 2011, 11:20 AM MST for 9 counties in Colorado. It was in force for 6 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
- Feb 28, 2011, 11:20 AM MST (18:20 UTC)
- Expired
- Feb 28, 2011, 5:00 PM MST
- In force
- 6 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Jefferson County, CO, Lincoln County, CO
The radar
The Denver radar (KFTG), 21 km from the middle of the area, began a volume at 18:23 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
Denver, CO (KDNR), launched 12:00Z, 6.3 hours before the alert went out and 124 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
- 2318 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 162 m²/s²
- 0-3 km storm-relative helicity
- 254 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
281 WWUS85 KBOU 281820 RFWBOU URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 1120 AM MST MON FEB 28 2011 ...DRY AND WINDY CONDITIONS FOR THE PALMER DIVIDE AND ADJACENT PLAINS... .DRY SOUTHWESTERLY FLOW UNDER A BUILDING RIDGE AND A DEEPENING SURFACE TROUGH WILL COMBINE TO BRING CRITICAL FIRE WEATHER CONDITIONS OVER THE PALMER DIVIDE...INTO THE SOUTHERN PART OF ZONE 240 AND THEN STRETCHING OVER ALL OF ZONES 246 AND 247. AS THE SURFACE LOW MOVES SOUTH LATER THIS AFTERNOON AND THE DIURNAL EFFECTS TAKE PLACE...RED FLAG CONDITIONS ARE EXPECTED TO DIMINISH BY 5 PM. COZ240-241-246-247-010000- /O.NEW.KBOU.FW.W.0001.110228T1820Z-110301T0000Z/ NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY- ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY- SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY- 1120 AM MST MON FEB 28 2011 ...RED FLAG WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 240...241... 246 AND 247... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON. * AFFECTED AREA...FIRE WEATHER ZONE 240...AURORA...DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON...PARKER ...FIRE WEATHER ZONE 241...CASTLE ROCK...ELBERT...FONDIS ...KIOWA...LARKSPUR...FIRE WEATHER ZONE 246...AGATE...HUGO LIMON...MATHESON...FIRE WEATHER ZONE 247...FORDER...KARVAL ...KUTCH...PUNKIN CENTER. * TIMING...THE PALMER DIVIDE IS CURRENTLY EXPERIENCING RED FLAG CONDITIONS WHICH WILL SPREAD TO THE SOUTHERN PARTS OF ZONE 240 AND ALL OF 246 AND 247 WITHIN THE NEXT HOUR OR TWO. WINDS WILL DIMINISH BY 00Z. * WIND...SOUTHWESTERLY WINDS OF 10 TO 20 MPH WITH GUSTS UP TO 30 MPH. * HUMIDITY...LOWEST HUMIDITIES RIGHT AROUND 10 PERCENT * IMPACTS...LOW HUMIDITY AND GUSTY WINDS WILL COMBINE WITH DRY FUELS TO CREATE CONDITIONS FOR QUICK FIRE SPREAD IF ONE WERE TO START. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR IMMINENT. PLEASE ADVISE THE APPROPRIATE OFFICIALS AND FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING. && $$
2 follow-up statements
757 WWUS85 KBOU 282143 RFWBOU URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 243 PM MST MON FEB 28 2011 ...DRY AND WINDY CONDITIONS CONTINUE FOR THE PALMER DIVIDE AND WESTERN AND CENTRAL DENVER METRO AREA AND EAST TO LINCOLN COUNTY... .DRY SOUTHWESTERLY FLOW UNDER A BUILDING RIDGE AND A DEEPENING SURFACE TROUGH WILL CONTINUE TO BRING CRITICAL FIRE WEATHER CONDITIONS OVER THE PALMER DIVIDE...ZONE 239 AND THE SOUTHERN PART OF ZONE 240...THEN STRETCHING OVER ALL OF ZONES 246 AND 247. AS THE SURFACE LOW MOVES SOUTH LATER THIS AFTERNOON AND THE DIURNAL EFFECTS TAKE PLACE...RED FLAG CONDITIONS ARE EXPECTED TO DIMINISH BY 5 PM. COZ239-010000- /O.EXA.KBOU.FW.W.0001.000000T0000Z-110301T0000Z/ BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY- 243 PM MST MON FEB 28 2011 ...RED FLAG WARNING IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 239... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON. * AFFECTED AREA...FIRE WEATHER ZONE 239...LONGMONT...BOULDER... GOLDEN. * TIMING...CURRENT RED FLAG CONDITIONS WILL CONTINUE THIS AFTERNOON UNTIL WINDS DECREASE AROUND 00Z. * WIND...WESTERLY WINDS OF 10 TO 20 MPH WITH GUSTS UP TO 35 MPH. * HUMIDITY...LOWEST HUMIDITIES RIGHT AROUND 10 PERCENT * IMPACTS...LOW HUMIDITY AND GUSTY WINDS WILL COMBINE WITH DRY FUELS TO CREATE CONDITIONS FOR QUICK FIRE SPREAD IF ONE WERE TO START. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR IMMINENT. PLEASE ADVISE THE APPROPRIATE OFFICIALS AND FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING. && $$ COZ240-241-246-247-010000- /O.CON.KBOU.FW.W.0001.000000T0000Z-110301T0000Z/ NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY- ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY- SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY- 243 PM MST MON FEB 28 2011 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 5 PM MST THIS AFTERNOON FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONES 240...241...246 AND 247... * AFFECTED AREA...FIRE WEATHER ZONE 240...AURORA...DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON...PARKER... FIRE WEATHER ZONE 241...CASTLE ROCK...ELBERT...FONDIS...KIOWA ...LARKSPUR...FIRE WEATHER ZONE 246...AGATE...HUGO...LIMON... MATHESON...FIRE WEATHER ZONE 247...FORDER...KARVAL...KUTCH... ...PUNKIN CENTER. * TIMING...RED FLAG CONDITIONS WILL CONTINUE UNTIL WINDS DECREASE BY 00Z. * WIND...SOUTHWESTERLY WINDS OF 10 TO 20 MPH WITH GUSTS UP TO 30 MPH. * HUMIDITY...LOWEST HUMIDITIES RIGHT AROUND 10 PERCENT * IMPACTS...LOW HUMIDITY AND GUSTY WINDS WILL COMBINE WITH DRY FUELS TO CREATE CONDITIONS FOR QUICK FIRE SPREAD IF ONE WERE TO START. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR IMMINENT. PLEASE ADVISE THE APPROPRIATE OFFICIALS AND FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING. && $$
000 WWUS85 KBOU 010009 RFWBOU URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 509 PM MST MON FEB 28 2011 COZ239>241-246-247-010115- /O.EXP.KBOU.FW.W.0001.000000T0000Z-110301T0000Z/ BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY- NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY- ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET- NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN COUNTY- SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY- 509 PM MST MON FEB 28 2011 ...RED FLAG WARNING HAS EXPIRED FOR GUSTY WINDS AND LOW HUMIDITY FOR FIRE WEATHER ZONE 239... THE RED FLAG WARNING IS NO LONGER IN EFFECT. WINDS HAVE DECREASED INTO THE 15 TO 20 MPH RANGE ACROSS MOST OF THE AREA...AND WILL CONTINUE TO GRADUALLY DECREASE INTO THE EARLY EVENING. WITH HUMIDITIES STILL VERY LOW...THE FIRE DANGER WILL REMAIN HIGH THIS EVENING BUT WILL BE DECREASING. $$ GIMMESTAD
Nearby
Red Flag Warnings in Colorado, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.