Alert archive / Colorado / Red Flag Warnings in 2018
Red Flag Warning 32, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Jun 27, 2018, 3:39 AM MDT for 11 counties in Colorado. It took effect at Jun 28, 2018, 11:00 AM MDT. It was in force for 11 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
- Jun 27, 2018, 3:39 AM MDT (09:39 UTC)
- In effect from
- Jun 28, 2018, 11:00 AM MDT
- Expired
- Jun 28, 2018, 9:30 PM MDT
- In force
- 11 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 86 km from the middle of the area, began a volume at 09:40 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 (KDEN), launched 00:00Z, 9.7 hours before the alert went out and 196 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
- 174 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 4447 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 44 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
612 WWUS85 KBOU 270939 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 339 AM MDT Wed Jun 27 2018 COZ211-213>215-217-238-271745- /O.UPG.KBOU.FW.A.0018.180628T1700Z-180629T0300Z/ /O.NEW.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- Larimer and Boulder Counties Between 6000 and 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 339 AM MDT Wed Jun 27 2018 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO... 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 9 PM MDT Thursday. The Fire Weather Watch is no longer in effect. * Affected Area...Fire Weather Zones 211...213...214...215... 217 and 238. * Timing...11 AM MDT to 9 PM MDT Thursday * Winds...Southwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 8 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$
6 follow-up statements
272 WWUS85 KBOU 271910 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 110 PM MDT Wed Jun 27 2018 COZ211-213>215-217-238-281100- /O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- Larimer and Boulder Counties Between 6000 and 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 110 PM MDT Wed Jun 27 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO... * Affected Area...Fire Weather Zones 211...213...214...215... 217 and 238. * Timing...11 AM MDT to 9 PM MDT Thursday * Winds...Southwest 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...As low as 8 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
048 WWUS85 KBOU 272214 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 414 PM MDT Wed Jun 27 2018 COZ218-281100- /O.EXA.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/ South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- 414 PM MDT Wed Jun 27 2018 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MEDICINE BOW AND FRONT RANGE MOUNTAINS ABOVE 9000 FEET IN LARIMER, GRAND AND NORTHWEST BOULDER 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 9 PM MDT Thursday. * Affected Area...Fire Weather Zone 218. * Timing...11 AM MDT to 9 PM MDT Thursday * Winds...Southwest 10 to 25 mph with gusts up to 35 mph. * Relative Humidity...As low as 10 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$ COZ211-213>215-217-238-281100- /O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0300Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- Larimer and Boulder Counties Between 6000 and 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 414 PM MDT Wed Jun 27 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO... * Affected Area...Fire Weather Zones 211...213...214...215... 217 and 238. * Timing...11 AM MDT to 9 PM MDT Thursday * Winds...Southwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 8 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
008 WWUS85 KBOU 281037 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 437 AM MDT Thu Jun 28 2018 ...EXTREME FIRE DANGER IN THE MOUNTAINS TODAY... .Very hot and very dry conditions today will combine with wind gusts of 25 to 35 mph to produce extreme fire danger across the northern Colorado mountains this afternoon and evening. The fire danger will also be elevated on the plains, but the winds will not be as strong. Conditions will not be as extreme on Friday, but fire danger will still be very high, especially in the mountain valleys. Please pay attention to restrictions on fires and fireworks. Check with your local fire department, sheriff, or land managers for details on what is allowed. COZ212-216-281845- /O.EXB.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/ South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 437 AM MDT Thu Jun 28 2018 ...RED FLAG WARNING IN EFFECT FROM 11 AM THIS MORNING TO MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE CENTRAL COLORADO MOUNTAINS AND SOUTHERN FRONT RANGE FOOTHILLS... 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 this morning to midnight MDT tonight. * Affected Area...Fire Weather Zones 212 and 216. * Timing...11 AM MDT to 9 PM MDT Thursday * Winds...Southwest 10 to 20 mph with gusts up to 30 mph. * Relative Humidity...As low as 9 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$ COZ211-213-214-281845- /O.NEW.KBOU.FW.A.0019.180629T1700Z-180630T0300Z/ /O.EXT.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- 437 AM MDT Thu Jun 28 2018 ...RED FLAG WARNING NOW IN EFFECT FROM 11 AM THIS MORNING TO MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO... ...FIRE WEATHER WATCH IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY... The National Weather Service in Denver has issued a Fire Weather Watch FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect from Friday morning through Friday evening. * Affected Area...Fire Weather Zones 211...213 and 214. * Timing...11 AM MDT to 9 PM MDT Thursday * Winds...Southwest 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...As low as 8 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ COZ215-217-218-238-281845- /O.EXT.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 437 AM MDT Thu Jun 28 2018 ...RED FLAG WARNING NOW IN EFFECT FROM 11 AM THIS MORNING TO MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MEDICINE BOW AND FRONT RANGE MOUNTAINS ABOVE 9000 FEET IN LARIMER, GRAND AND NORTHWEST BOULDER COUNTIES... * Affected Area...Fire Weather Zones 215...217...218 and 238. * Timing...11 AM MDT to 9 PM MDT Thursday * Winds...Southwest 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...As low as 8 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$ Gimmestad/RJK
677 WWUS85 KBOU 281419 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 819 AM MDT Thu Jun 28 2018 ...EXTREME FIRE DANGER IN THE MOUNTAINS TODAY... .Very hot and very dry conditions today will combine with wind gusts of 25 to 35 mph to produce extreme fire danger across the northern Colorado mountains this afternoon and evening. The fire danger will also be elevated on the plains, but the winds will not be as strong. Conditions will not be as extreme on Friday, but fire danger will still be very high, especially in the mountain valleys. Please pay attention to restrictions on fires and fireworks. Check with your local fire department, sheriff, or land managers for details on what is allowed. COZ211-213-214-290000- /O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/ /O.CON.KBOU.FW.A.0019.180629T1700Z-180630T0300Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- 819 AM MDT Thu Jun 28 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE FOOTHILLS AND NEARBY PLAINS, THE PARK RANGE, AND THE HIGH MOUNTAIN VALLEYS OF NORTH CENTRAL COLORADO... ...FIRE WEATHER WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY... * Affected Area...Fire Weather Zones 211...213 and 214. * Timing...11 AM MDT to midnight Thursday evening, then again late Friday morning through Friday evening. * Winds...Southwest 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...As low as 8 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings. && $$ COZ212-215>218-238-290000- /O.CON.KBOU.FW.W.0032.180628T1700Z-180629T0600Z/ South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 819 AM MDT Thu Jun 28 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MEDICINE BOW AND FRONT RANGE MOUNTAINS ABOVE 9000 FEET IN LARIMER, GRAND AND NORTHWEST BOULDER COUNTIES... * Affected Area...Fire Weather Zones 212...215...216...217... 218 and 238. * Timing...11 AM MDT to midnight Thursday evening. * Winds...Southwest 10 to 20 mph with gusts up to 35 mph. * Relative Humidity...As low as 9 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$
842 WWUS85 KBOU 282042 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 242 PM MDT Thu Jun 28 2018 ...EXTREME FIRE DANGER IN THE MOUNTAINS TODAY... .Very hot and very dry conditions with wind gusts of 25 to 40 mph will continue to produce extreme fire danger across the northern Colorado mountains this afternoon and evening. The fire danger will also be elevated on the plains. In addition, isolated high based showers and thunderstorms will produce wind gusts to 50 mph and possibly dry lightning. Little to no rainfall is expected. Conditions will not be as extreme on Friday, but fire danger will still be very high, especially in the mountains and mountain valleys where winds will gust to 30 mph. Please pay attention to restrictions on fires and fireworks. Check with your local fire department, sheriff, or land managers for details on what is allowed. COZ211-213-214-291200- /O.UPG.KBOU.FW.A.0019.180629T1700Z-180630T0300Z/ /O.NEW.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/ /O.CON.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- 242 PM MDT Thu Jun 28 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH, MIDDLE, AND SOUTH PARKS... ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR NORTH, MIDDLE, AND SOUTH PARKS... 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 9 PM MDT Friday. The Fire Weather Watch is no longer in effect. * Affected Area...Fire Weather Zones 211...213 and 214. * Timing...11 AM MDT to midnight Thursday evening, then again late Friday morning through Friday evening. * Winds...Southwest 10 to 20 mph with gusts up to 40 mph. * Relative Humidity...As low as 5 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$ COZ217-218-291200- /O.NEW.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/ /O.CON.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/ West Jackson and West Grand Counties Above 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- 242 PM MDT Thu Jun 28 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF NORTH CENTRAL COLORADO... ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF NORTH CENTRAL COLORADO... 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 9 PM MDT Friday. * Affected Area...Fire Weather Zones 217 and 218. * Timing...11 AM MDT to midnight Thursday evening, then again late Friday morning through Friday evening. * Winds...Southwest 15 to 25 mph with gusts up to 40 mph. * Relative Humidity...As low as 9 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$ COZ212-215-216-238-290600- /O.CON.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/ South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 242 PM MDT Thu Jun 28 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS, LARIMER AND NORTHWEST WELD COUNTIES, AND THE MOUNTAINS AROUND I-70... * Affected Area...Fire Weather Zones 212...215...216 and 238. * Timing...11 AM MDT to midnight Thursday evening. * Winds...Southwest 10 to 20 mph with gusts up to 40 mph. * Relative Humidity...As low as 5 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
114 WWUS85 KBOU 290330 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 930 PM MDT Thu Jun 28 2018 ...EXTREME FIRE DANGER IN THE MOUNTAINS AGAIN FRIDAY... .Temperatures have cooled this evening along with diminishing winds. This has offered some relief from the extreme fire danger levels earlier today. Humidity recoveries are still expected to be poor overnight. The Red Flag Warning for this evening has been cancelled. Very hot and very dry conditions with wind gusts of 20 to 35 mph are expected again Friday which will produce extreme fire danger across the northern and central Colorado mountains Friday afternoon and evening. Please pay attention to restrictions on fires and fireworks. Check with your local fire department, sheriff, or land managers for details on what is allowed. COZ211-213-214-217-218-291130- /O.CAN.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/ /O.CON.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/ Jackson County Below 9000 Feet- Grand and Summit Counties Below 9000 Feet- Central and Southeast Park County- West Jackson and West Grand Counties Above 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- 930 PM MDT Thu Jun 28 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF NORTH CENTRAL COLORADO... ...RED FLAG WARNING FOR TONIGHT IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS OF NORTH CENTRAL COLORADO... * Affected Area...Fire Weather Zones 211...213...214...217 and 218. * Timing...Late Friday morning through Friday evening. * Winds...Southwest 15 to 25 mph with gusts up to 35 mph. * Relative Humidity...As low as 7 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. 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 can contribute to extreme fire behavior. && $$ COZ212-291130- /O.CAN.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/ /O.EXA.KBOU.FW.W.0033.180629T1700Z-180630T0300Z/ South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet- 930 PM MDT Thu Jun 28 2018 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 9 PM MDT FRIDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS AROUND I-70... ...RED FLAG WARNING TONIGHT IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE MOUNTAINS AROUND I-70... The National Weather Service in Denver has issued a Red Flag Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect from 11 AM to 9 PM MDT Friday. * Affected Area...Fire Weather Zone 212. * Timing...Late Friday morning through Friday evening. * Winds...Southwest 15 to 25 mph with gusts up to 35 mph. * Relative Humidity...As low as 8 percent. * Impacts...Rapid fire growth and spread will be possible under these hot, dry and breezy conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ215-216-238-290430- /O.CAN.KBOU.FW.W.0032.000000T0000Z-180629T0600Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- 930 PM MDT Thu Jun 28 2018 ...RED FLAG WARNING FOR TONIGHT IS CANCELLED FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FOOTHILLS, LARIMER AND NORTHWEST WELD COUNTIES... The National Weather Service in Denver has cancelled the Red Flag Warning. As temperatures have cooled this evening, relative humidity levels have slowly increased. Winds have also diminished, helping to reduce the fire danger levels and fire behaviors. Humidity recovery is still expected to be poor overnight. $$
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 Denver/Boulder, CO wrote its last area forecast discussion before this red flag warning went out at Jun 26, 11:35 PM MDT, 4 hours 4 minutes earlier.
Area forecast discussion, Jun 26, 11:35 PM MDT, 4 hours 4 minutes before
Area Forecast Discussion National Weather Service Denver/Boulder CO 1135 PM MDT Tue Jun 26 2018 .UPDATE... Issued at 831 PM MDT Tue Jun 26 2018 Benign pattern tonight. No changes planned in the grids, current forecast on track. && .SHORT TERM...(This evening through Wednesday) Issued at 204 PM MDT Tue Jun 26 2018 A mid to upper level ridge has continued to build over New Mexico today and subsidence from this will lead to dry conditions tonight. Low temperatures will stay a few degrees above normal as winds will remain light. Forecast highs on Wednesday are still on track to be near records especially along the urban corridor. The focus then shifts to the positioning of a shallow cold front that will bring dew points in the upper 50s to low 60s into northeast Colorado late tonight and into Wednesday. Models tend to struggle in these scenarios so confidence will be low concerning the intensity and coverage of thunderstorms tomorrow. If this moisture were to push up into the foothills, scattered strong to severe thunderstorms would be possible from the urban corridor to the eastern plains. These storms would be aided by good mixed layer CAPE of near 2500 J/kg along with sufficient 0-6km bulk shear of 30-35 knots according to the NAM. With this scenario possible, I tend to agree with SPC adding a marginal risk area across northeast Colorado. Storms that do develop could produce large hail due to nearly dry adiabatic mid level lapse rates as well as gusty winds as forecast soundings show a bit of an inverted-V structure. However, it is also possible that the shallow moisture mixes out tomorrow afternoon and showers and storms will stay weaker and isolated in nature. With that being said, I have increased POPs tomorrow afternoon and evening to account for the first scenario. .LONG TERM...(Wednesday night through Tuesday) Issued at 204 PM MDT Tue Jun 26 2018 Hot upper level ridge over Colorado will shift east of the state on Thursday. This will cause the light westerly flow aloft to turn southwesterly and become stronger through the day. Near record the high temperatures and low relative humidities has prompted a fire weather watch for the northern Front range foothills and nearby plains, and high mountain valleys. The watch will run from late Thursday morning until mid-evening on Thursday. Friday will be not quite as hot with an upper level trough moving in from the west. However, gusty southwest winds and low relative humidities will keep the fire danger high in the areas mainly along and west of the Continental Divide. East of the Divide, a morning cold front will bring slightly cooler temperatures and higher humidities to the plains, as well as a slight chance of late day storms. This cooling trend will continue over the weekend, along with a better chance for the thunderstorms and wetting rainfall with passage of the upper level trough. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 1128 PM MDT Tue Jun 26 2018 VFR clear through the period. Wind direction the big issue, mainly southerly drainage wind tonight, then a brief period 15-18z where they shift around to the north then veer east then south by the end of the day. Slight chance of thunderstorms late afternoon but not big enough numbers to include in the forecast. && .FIRE WEATHER... Issued at 204 PM MDT Tue Jun 26 2018 Fire danger will be elevated tomorrow due to hot temperatures and low RHs. But due to the lighter winds, no highlights are anticipated on Wednesday. Hot temperatures, very low relative humidities, a high Haines Index, and gusty southwest winds may combine with the dry fuels to create high to extreme fire behavior conditions the mountain valleys, the Park Range, the northern Front Range foothills and nearby plains on Thursday. As a result, a Fire Weather Watch has been issued for Thursday. The critical fire weather conditions should start to improve gradually by mid evening with decreasing temperatures and rising humidities. Increasing southwest flow aloft ahead of an approaching upper level trough will warm temperatures even more, and lower relative humidities across the forecast area. However, the stronger winds are expected to be confined to the northern mountains, high mountain valleys and the northern Front Range Foothills. Could see a repeat of these conditions in about the same area on Friday, although temperatures are not expected to be as warm. && .BOU WATCHES/WARNINGS/ADVISORIES... Fire Weather Watch from Thursday morning through Thursday evening for COZ211-213>215-217-238. && UPDATE...Cooper SHORT TERM...Danielson LONG TERM...Baker AVIATION...Hanson FIRE WEATHER...Baker
Hazardous weather outlook, Jun 26, 11:14 AM MDT, 16 hours 25 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1114 AM MDT Tue Jun 26 2018 COZ030>051-270515- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- 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- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 1114 AM MDT Tue Jun 26 2018 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...This Afternoon and Tonight No hazardous weather is expected at this time. Hot weather will be the rule today, with highs on the plains reaching well into the 90s and the mountains seeing temperatures in the 80s. Hot temperatures and low humidity will combine to elevate fire danger. .DAYS TWO THROUGH SEVEN...Wednesday through Monday It will remain hot and dry through Friday with the hottest temperatures expected on Thursday. Many locations on the plains could reach or surpass the 100 degree mark Thursday afternoon. Isolated high-based thunderstorms late Wednesday afternoon and evening could produce a few sprinkles, wind gusts and perhaps a lightning strike or two. The near record hot temperatures, low humidity and somewhat stronger winds on Thursday will further increase the fire danger in many areas. An upper level trough and associated cold front will bring a respite from the heat by the weekend with a chance of showers and thunderstorms mainly for the high plains. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight. Meier/Baker
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 4:49 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver, Weld | 26 min |
| Jun 27, 5:24 PM MDT | Special Weather Statement | BOU | Denver | 36 min |
Nearby
Red Flag Warnings in Colorado, 2018Every red flag warning in 2018
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.