Alert archive / Colorado / Red Flag Warnings in 2012
Red Flag Warning 12, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at May 4, 2012, 4:12 PM MDT for Grand County, Jackson County, Summit County, Colorado. It took effect at May 5, 2012, 11:00 AM MDT. It was in force for 7 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
- May 4, 2012, 4:12 PM MDT (22:12 UTC)
- In effect from
- May 5, 2012, 11:00 AM MDT
- Expired
- May 5, 2012, 6:00 PM MDT
- In force
- 7 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Grand County, CO, Jackson County, CO, Summit County, CO
The radar
The Denver radar (KFTG), 146 km from the middle of the area, began a volume at 22:17 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
Grand Junction, CO (KGJT), launched 12:00Z, 10.2 hours before the alert went out and 227 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
- 2974 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 99 m²/s²
- 0-3 km storm-relative helicity
- 168 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
858 WWUS85 KBOU 042212 RFWBOU URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 412 PM MDT FRI MAY 4 2012 COZ211-213-050615- /O.NEW.KBOU.FW.W.0012.120505T1700Z-120506T0000Z/ /O.CON.KBOU.FW.W.0011.000000T0000Z-120505T0200Z/ JACKSON COUNTY BELOW 9000 FEET- GRAND AND SUMMIT COUNTIES BELOW 9000 FEET- 412 PM MDT FRI MAY 4 2012 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HIGHER VALLEYS OF GRAND AND JACKSON COUNTIES... ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 6 PM MDT SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HIGH VALLEYS OF GRAND AND JACKSON COUNTIES... THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A RED FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN EFFECT FROM 11 AM TO 6 PM MDT SATURDAY. * AFFECTED AREA...FIRE WEATHER ZONES 211 AND 213. * TIMING...NOW UNTIL 8 PM MDT THIS EVENING...AND AGAIN FROM 11 AM MDT SATURDAY UNTIL 6 PM MDT SATURDAY EVENING. * WINDS...SOUTHWEST 10 TO 20 MPH WITH GUSTS UP TO 35 MPH UNTIL 8 PM THIS EVENING. THE WINDS WILL DECREASE OVER NIGHT AND THEN INCREASE AGAIN BY LATE SATURDAY MORNING. * RELATIVE HUMIDITY...5-15 PERCENT DURING THE WARNING TIMES. * IMPACTS...THE COMBINATION OF GUSTY WINDS AND LOW HUMIDITY WILL RESULT IN THE THE POTENTIAL FOR RAPIDLY SPREADING FIRE GROWTH. 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. && $$
3 follow-up statements
555 WWUS85 KBOU 050157 RFWBOU URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 757 PM MDT FRI MAY 4 2012 COZ211-213-051100- /O.EXP.KBOU.FW.W.0011.000000T0000Z-120505T0200Z/ /O.CON.KBOU.FW.W.0012.120505T1700Z-120506T0000Z/ JACKSON COUNTY BELOW 9000 FEET- GRAND AND SUMMIT COUNTIES BELOW 9000 FEET- 757 PM MDT FRI MAY 4 2012 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 6 PM MDT SATURDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HIGHER VALLEYS OF GRAND AND JACKSON COUNTIES... ...RED FLAG WARNING WILL EXPIRE AT 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HIGHER VALLEYS OF GRAND AND JACKSON COUNTIES... * AFFECTED AREA...FIRE WEATHER ZONES 211 AND 213. * TIMING...SOUTHWEST WINDS WILL CONTINUE TO DECREASE THROUGH THE EVENING AND RELATIVE HUMIDITIES WILL SLOWLY RISE...THEREFORE THE RED FLAG WARNING FOR THIS EVENING WILL BE ALLOWED TO EXPIRE AT 8 PM MDT. RELATIVE HUMIDITY RECOVERY WILL BE POOR OVERNIGHT ALONG MID AND UPPER SLOPES. RED FLAG CONDITIONS WILL RETURN SATURDAY AFTERNOON. * WINDS...SOUTHWEST 10 TO 20 MPH WITH GUSTS UP TO 35 MPH WILL DEVELOP SATURDAY. * RELATIVE HUMIDITY...WILL FALL INTO THE 10 TO 15 PERCENT RANGE. * IMPACTS...THE COMBINATION OF GUSTY WINDS AND LOW HUMIDITY WILL RESULT IN THE THE POTENTIAL FOR RAPIDLY SPREADING FIRE GROWTH. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR IMMINENT. PLEASE ADVISE THE APPROPRIATE OFFICIALS AND FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING. && $$
022 WWUS85 KBOU 051137 RFWBOU URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 537 AM MDT SAT MAY 5 2012 COZ211-213-051945- /O.CON.KBOU.FW.W.0012.120505T1700Z-120506T0000Z/ JACKSON COUNTY BELOW 9000 FEET- GRAND AND SUMMIT COUNTIES BELOW 9000 FEET- 537 AM MDT SAT MAY 5 2012 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 6 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HIGHER VALLEYS OF GRAND AND JACKSON COUNTIES... * AFFECTED AREA...FIRE WEATHER ZONES 211 AND 213. * TIMING...SKIES WILL BE SUNNY TODAY WITH TEMPERATURES CLIMBING BACK INTO THE 60S AND GUSTY SOUTHWEST WINDS ALSO DEVELOPING AFTER 1200. RED FLAG CONDITIONS WILL DEVELOP DURING THE AFTERNOON HOURS. * WINDS...SOUTHWEST 10 TO 20 MPH WITH GUSTS UP TO 30 MPH AFTER 1200. * RELATIVE HUMIDITY...AS LOW AS 10 PERCENT. * IMPACTS...THE COMBINATION OF GUSTY WINDS AND LOW HUMIDITY WILL RESULT IN THE THE POTENTIAL FOR RAPIDLY SPREADING FIRE GROWTH. 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. && $$
514 WWUS85 KBOU 051714 RFWBOU URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE DENVER CO 1114 AM MDT SAT MAY 5 2012 COZ211-213-060000- /O.CON.KBOU.FW.W.0012.000000T0000Z-120506T0000Z/ JACKSON COUNTY BELOW 9000 FEET- GRAND AND SUMMIT COUNTIES BELOW 9000 FEET- 1114 AM MDT SAT MAY 5 2012 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE HIGHER VALLEYS OF GRAND AND JACKSON COUNTIES... * AFFECTED AREA...FIRE WEATHER ZONES 211 AND 213. * TIMING...SKIES WILL BE SUNNY TODAY WITH TEMPERATURES CLIMBING BACK INTO THE 60S AND GUSTY SOUTHWEST WINDS ALSO DEVELOPING. RED FLAG CONDITIONS WILL OCCUR DURING THE AFTERNOON HOURS. * WINDS...SOUTHWEST 10 TO 20 MPH WITH GUSTS UP TO 35 MPH. * RELATIVE HUMIDITY...AS LOW AS 12 PERCENT. * IMPACTS...THE COMBINATION OF GUSTY WINDS AND LOW HUMIDITY WILL RESULT IN THE THE POTENTIAL FOR RAPIDLY SPREADING FIRE GROWTH. PRECAUTIONARY/PREPAREDNESS ACTIONS... A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS ARE EITHER OCCURRING OR IMMINENT. PLEASE ADVISE THE APPROPRIATE OFFICIALS AND FIRE CREWS IN THE FIELD OF THIS RED FLAG WARNING. && $$
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 2:28 AM MDT | Dense Fog Advisory | BOU | Phillips, Sedgwick | 6 hr |
| May 4, 2:57 AM MDT | Red Flag Warning | BOU | Grand, Jackson, Summit | 17 hr |
Nearby
Red Flag Warnings in Colorado, 2012Every red flag warning in 2012
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.