Alert archive / Colorado / Red Flag Warnings in 2018
Red Flag Warning 16, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Apr 10, 2018, 3:44 AM MDT for 19 counties in Colorado. It took effect at Apr 11, 2018, 11:00 AM MDT. It was in force for 8 hr. 4 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 10, 2018, 3:44 AM MDT (09:44 UTC)
- In effect from
- Apr 11, 2018, 11:00 AM MDT
- Expired
- Apr 11, 2018, 7:00 PM MDT
- In force
- 8 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Adams County, CO, Arapahoe County, CO, Boulder County, CO, Broomfield County, CO, Clear Creek County, CO, Denver County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Jefferson County, CO, Larimer County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Park County, CO, Phillips County, CO, Sedgwick County, CO, Washington County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 22 km from the middle of the area, began a volume at 09:49 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 11, 12:52 PM MDT | NON-TSTM WND GST 79 | 1 Wsw Loveland Heights, CO | MESONET STATION F2478, 1 WSW LOVELAND HEIGHTS. |
| Apr 11, 1:35 PM MDT | NON-TSTM WND GST 68 | 4 E Buckeye, CO | MESONET STATION BEYC2, 4 E BUCKEYE. |
| Apr 11, 2:05 PM MDT | NON-TSTM WND GST 73 | 2 Ne Boulder, CO | |
| Apr 11, 2:06 PM MDT | NON-TSTM WND GST 63 | 1 Nw Glen Haven, CO | MESONET STATION E4490, 1 NW GLEN HAVEN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 9.7 hours before the alert went out and 99 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
- 1983 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
329 WWUS85 KBOU 100944 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 344 AM MDT Tue Apr 10 2018 ...FIRE DANGER INCREASES WEDNESDAY THROUGH THURSDAY... .Critical fire danger will develop across the Front Range Foothills, Park County, and all of the plains on Wednesday as warmer temperatures combine with gusty winds and very low humidities. Fire danger may become extreme in some areas by Thursday as winds continue to strengthen in a very warm and dry airmass. The highest danger on Thursday will likely develop from South Park and the Southern Foothills across the Palmer Divide area. Critical conditions will be possible farther north, but confidence is not as high north of I-76. COZ214-216-239>241-245>247-249-102200- /O.NEW.KBOU.FW.W.0016.180411T1700Z-180412T0100Z/ /O.NEW.KBOU.FW.W.0017.180412T1600Z-180413T0300Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 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- 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- Washington County- 344 AM MDT Tue Apr 10 2018 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 7 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK...SOUTHERN FRONT RANGE FOOTHILLS...PALMER DIVIDE...AND NEARBY ADJACENT PLAINS TO DENVER AND AKRON... 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 7 PM MDT Wednesday. A Red Flag Warning has also been issued from 10 AM to 9 PM MDT Thursday. * Affected Area...Fire Weather Zones 214...216...239...240... 241...245...246...247 and 249. * Timing...Critical conditions are expected to develop late Wednesday morning and continue into early Wednesday evening. Extreme fire danger is expected late Thursday morning through Thursday evening. * Winds...West 15 to 25 mph with gusts around 35 mph on Wednesday, and then Southwest winds 25 to 35 mph with gusts around 50 mph possible on Thursday. A cold front may also bring shifting winds Thursday evening. * Relative Humidity...As low as 9 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible Thursday due to stronger winds. 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. && $$ COZ215-238-242>244-248-250-251-102200- /O.NEW.KBOU.FW.W.0016.180411T1700Z-180412T0100Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- Northeast Weld County-Central and South Weld County-Morgan County- Logan County-Sedgwick County-Phillips County- 344 AM MDT Tue Apr 10 2018 ...RED FLAG WARNING IN EFFECT FROM 11 AM TO 7 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... The National Weather Service in Denver has issued a Red Flag Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect from 11 AM to 7 PM MDT Wednesday. * Affected Area...Fire Weather Zones 215...238...242...243... 244...248...250 and 251. * Timing...Critical conditions are expected to develop late Wednesday morning and continue into early Wednesday evening. * Winds...West 15 to 25 mph with gusts up to 35 mph, except gusts up to 45 mph in the foothills. * Relative Humidity...As low as 12 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
4 follow-up statements
865 WWUS85 KBOU 102016 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 216 PM MDT Tue Apr 10 2018 ...FIRE DANGER INCREASES WEDNESDAY THROUGH THURSDAY... .Critical fire danger will develop across the Front Range Foothills, Park County, and all of the plains on Wednesday as warmer temperatures combine with gusty winds and very low humidities. Fire danger may become extreme in some areas by Thursday as winds continue to strengthen in a very warm and dry airmass. The highest danger on Thursday will likely develop from South Park and the Southern Foothills across the Palmer Divide area. Critical conditions will be possible farther north, but confidence is not as high north of I-76. COZ214-216-239>241-245>247-249-111200- /O.CON.KBOU.FW.W.0016.180411T1700Z-180412T0100Z/ /O.CON.KBOU.FW.W.0017.180412T1600Z-180413T0300Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 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- 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- Washington County- 216 PM MDT Tue Apr 10 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 7 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... * Affected Area...Fire Weather Zones 214...216...239...240... 241...245...246...247 and 249. * Timing...Critical conditions are expected to develop late Wednesday morning and continue into early Wednesday evening. Extreme fire danger is expected late Thursday morning through Thursday evening. * Winds...Southwest to west 20 to 30 mph with gusts up to 40 mph Wednesday and up to 50 mph Thursday. * Relative Humidity...As low as 9 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible Thursday due to stronger winds. 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. && $$ COZ215-238-242>244-248-250-251-111200- /O.CON.KBOU.FW.W.0016.180411T1700Z-180412T0100Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- Northeast Weld County-Central and South Weld County-Morgan County- Logan County-Sedgwick County-Phillips County- 216 PM MDT Tue Apr 10 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM TO 7 PM MDT WEDNESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... * Affected Area...Fire Weather Zones 215...238...242...243... 244...248...250 and 251. * Timing...Critical conditions are expected to develop late Wednesday morning and continue into early Wednesday evening. * Winds...West 20 to 30 mph with gusts up to 40 mph. Gusts to 50 mph will be possible in the foothills. * Relative Humidity...As low as 10 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
501 WWUS85 KBOU 110903 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 303 AM MDT Wed Apr 11 2018 ...DANGEROUS FIRE WEATHER CONDITIONS TODAY THROUGH THURSDAY... .Critical fire danger will develop across the Front Range Foothills, Park County, and all of the plains today as near record warmth combines with gusty winds and very low humidities. Fire danger may become extreme in some areas by Thursday as winds continue to strengthen in this very warm and dry airmass. The highest danger on Thursday will likely develop from South Park and the Southern Foothills across the Palmer Divide area. Critical conditions will be possible farther north, but confidence is not as high north of I-76. COZ214-216-239>241-245>247-249-111900- /O.CON.KBOU.FW.W.0016.180411T1700Z-180412T0100Z/ /O.CON.KBOU.FW.W.0017.180412T1600Z-180413T0300Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 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- 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- Washington County- 303 AM MDT Wed Apr 11 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE SOUTHERN FRONT RANGE FOOTHILLS...SOUTH PARK...AND NEARBY ADJACENT PLAINS TO DENVER AND AKRON... * Affected Area...Fire Weather Zones 214...216...239...240... 241...245...246...247 and 249. * Timing...Critical fire weather conditions will develop late this morning and afternoon as winds strengthen and humidities lower. Conditions will improve early this evening as winds relax. Extreme fire danger is expected late Thursday morning through Thursday evening with even stronger winds. * Winds...West 20 to 25 mph with gusts around 35 mph today, and then southwest winds increasing to 25 to 35 mph with gusts around 50 mph possible on Thursday. A cold front may also bring shifting winds Thursday evening. * Relative Humidity...As low as 9 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible Thursday due to stronger winds. 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. Open burning is highly discouraged if not prohibited on Red Flag days. Use extreme caution with anything that may produce a spark. && $$ COZ215-238-242>244-248-250-251-111900- /O.CON.KBOU.FW.W.0016.180411T1700Z-180412T0100Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- Northeast Weld County-Central and South Weld County-Morgan County- Logan County-Sedgwick County-Phillips County- 303 AM MDT Wed Apr 11 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... * Affected Area...Fire Weather Zones 215...238...242...243... 244...248...250 and 251. * Timing...Critical conditions will develop late this morning and continue through the afternoon. Conditions will improve early this evening as winds decrease. Critical conditions may redevelop Thursday with a continuation of very warm temperatures and an increase of winds late in the day. * Winds...West 20 to 30 mph with gusts of 35 to 40 mph on the plains, and up to 50 mph in the foothills. * Relative Humidity...As low as 10 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Open burning is highly discouraged if not prohibited on Red Flag days. Use extreme caution with anything that may produce a spark. && $$
157 WWUS85 KBOU 111832 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1232 PM MDT Wed Apr 11 2018 ...DANGEROUS FIRE WEATHER CONDITIONS TODAY THROUGH THURSDAY... .Critical fire danger has developed across the Front Range Foothills, Park County, and all of the plains today as near record warmth combines with gusty winds and very low humidities. Fire danger may become extreme in some areas by Thursday as winds continue to strengthen in this very warm and dry airmass. The highest danger on Thursday will likely develop from South Park and the Southern Foothills across the Palmer Divide area. Critical conditions will be possible farther north, but confidence is not as high north of I-76. COZ214-216-239>241-245>247-249-120245- /O.CON.KBOU.FW.W.0016.000000T0000Z-180412T0100Z/ /O.CON.KBOU.FW.W.0017.180412T1600Z-180413T0300Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 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- 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- Washington County- 1232 PM MDT Wed Apr 11 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... * Affected Area...Fire Weather Zones 214...216...239...240... 241...245...246...247 and 249. * Timing...Critical fire weather conditions this afternoon as winds continue to strengthen and humidities lower. Conditions will improve later this evening as winds relax. Extreme fire danger is expected late Thursday morning through Thursday evening with even stronger winds. * Winds...Southwest 25 to 35 mph with gusts up to 50 mph. * Relative Humidity...As low as 9 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible Thursday due to stronger winds. 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. Open burning is highly discouraged if not prohibited on Red Flag days. Use extreme caution with anything that may produce a spark. && $$ COZ215-238-242>244-248-250-251-120100- /O.CON.KBOU.FW.W.0016.000000T0000Z-180412T0100Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- Northeast Weld County-Central and South Weld County-Morgan County- Logan County-Sedgwick County-Phillips County- 1232 PM MDT Wed Apr 11 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 7 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK...AND ALL OF THE PLAINS... * Affected Area...Fire Weather Zones 215...238...242...243... 244...248...250 and 251. * Timing...Critical fire weather conditions this afternoon as winds continue to strengthen and humidities lower. Conditions will improve later this evening as winds relax. Extreme fire danger is expected late Thursday morning through Thursday evening with even stronger winds. * Winds...West 20 to 30 mph with gusts up to 55 mph. * Relative Humidity...As low as 10 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. Open burning is highly discouraged if not prohibited on Red Flag days. Use extreme caution with anything that may produce a spark. && $$
121 WWUS85 KBOU 120057 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 657 PM MDT Wed Apr 11 2018 ...RED FLAG WARNING FOR SOUTH PARK...FRONT RANGE FOOTHILLS...AND MOST OF THE NORTHEAST COLORADO PLAINS THURSDAY... .Fire danger will ease overnight tonight as temperatures cool and winds diminish. Another day of strong winds and low humidities is expected on Thursday. Extreme fire danger is expected from South Park and the Southern Foothills across the Palmer Divide and Denver metro area. In areas further north, windy conditions will develop a bit later and the humidities will be a bit higher, but Red Flag conditions are expected to develop by early afternoon. COZ214-216-239>241-245>247-249-121200- /O.EXP.KBOU.FW.W.0016.000000T0000Z-180412T0100Z/ /O.CON.KBOU.FW.W.0017.180412T1600Z-180413T0300Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 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- 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- Washington County- 657 PM MDT Wed Apr 11 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK...THE SOUTHERN FRONT RANGE FOOTHILLS...DENVER METRO AREA AND PALMER DIVIDE... * Affected Area...Fire Weather Zones 214...216...239...240... 241...245...246...247 and 249. * Timing...Strong winds will redevelop Thursday morning with humidities dropping quickly by midday. Extreme fire danger is expected late Thursday morning through Thursday evening. * Winds...Southwest 20 to 30 mph with gusts up to 45 mph. * Relative Humidity...As low as 8 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Open burning is highly discouraged if not prohibited on Red Flag days. Use extreme caution with anything that may produce a spark. 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. && $$ COZ215-238-242>244-121200- /O.EXP.KBOU.FW.W.0016.000000T0000Z-180412T0100Z/ /O.EXA.KBOU.FW.W.0017.180412T1600Z-180413T0300Z/ Larimer and Boulder Counties Between 6000 and 9000 Feet- Larimer County Below 6000 Feet/Northwest Weld County- Northeast Weld County-Central and South Weld County-Morgan County- 657 PM MDT Wed Apr 11 2018 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 9 PM MDT THURSDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE NORTHERN FRONT RANGE FOOTHILLS AND LOWER ELEVATIONS OF LARIMER...WELD...AND MORGAN COUNTIES... The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM to 9 PM MDT Thursday. * Affected Area...Fire Weather Zones 215...238...242...243 and 244. * Timing... Winds will increase and humidities lower during the day Thursday. Red Flag conditions will develop in the late morning or early afternoon, with humidities increasing but strong winds continuing in the evening. * Winds...Southwest 15 to 25 mph with gusts up to 40 mph. Winds shifting to northwest in the evening. * Relative Humidity...As low as 10 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Open burning is highly discouraged if not prohibited on Red Flag days. Use extreme caution with anything that may produce a spark. A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ248-250-251-120200- /O.EXP.KBOU.FW.W.0016.000000T0000Z-180412T0100Z/ Logan County-Sedgwick County-Phillips County- 657 PM MDT Wed Apr 11 2018 ...RED FLAG WARNING WILL EXPIRE AT 7 PM MDT THIS EVENING... Winds will continue to decrease with increasing humidities this evening. High fire danger is expected again on Thursday, but humidities will be higher. Strong winds will develop in the late afternoon or early evening. $$ Gimmestad
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 Apr 10, 3:29 AM MDT, 15 minutes earlier.
Area forecast discussion, Apr 10, 3:29 AM MDT, 15 minutes before
Area Forecast Discussion National Weather Service Denver/Boulder CO 329 AM MDT Tue Apr 10 2018 .SHORT TERM...(Today and tonight) Issued at 214 AM MDT Tue Apr 10 2018 WNW flow aloft will be in place today and become more WLY tonight. Although it will be dry through tonight, cross-sections show some higher moisture will affect the area this aftn and tonight, with potential for wave clouds along the front range. Meanwhile as for highs, 850-700 mb temps rise from 8 to 9 degrees c this aftn so readings across the plains will be in the upper 60's to lower 70's. .LONG TERM...(Wednesday through Monday) Issued at 330 AM MDT Tue Apr 10 2018 ...Warmer temperatures and gusty winds through Thursday will bring high fire danger... Strong west/southwest flow aloft ahead of a digging trough will bring warmer temperatures and gusty winds to the forecast area. On Wednesday, a fast moving upper level disturbance (the one reaching northern California today) will move across to our north. This will only bring a couple light showers at most to the high country, but more importantly increase the winds and downslope drying due to subsidence behind the short wave. See Fire Weather Discussion below for impacts. High temperatures will reach the upper 70s in the lower elevations with wind gusts reaching 25 to 35 mph, and up to 45 mph in the foothills. By Thursday, a deeper upper level trough will move into the Great Basin with flow aloft strengthening further. Deep surface low pressure will develop in northeast Colorado. We look for another warm but windier day across most of the forecast area, although locations northeast of Denver could stay a little cooler and less windy depending on exactly where surface low pressure develops. By late afternoon, there should be enough lift ahead of the trough to bring late day showers and isolated thunderstorms to the mountains. Showers will become more widespread across the high country Thursday night and turn to all snow. At this time, mainly light to moderate snow accumulations are expected Thursday night into Friday across the mountains. There's still some uncertainty with regard to this next storm as it develops in the Central and Northern Plains. Models are still fairly consistent with an elongated upper low initially developing over Wyoming and Colorado Thursday night into early Friday morning, and then pushing just to our east before maturing into a full spring cyclone across the Central Plains with severe storms in the lower Arkansas/Mississippi River Valley, and a shield of snow and blowing snow over the Northern High Plains/Upper Midwest. Overall, it still appears we will be on the back edge of the precipitation shield, and any threat of light accumulating snow would stay over the eastern Colorado plains. We are certain that it will be windy and colder over the entire forecast area by Friday on the back side of this storm. However, there may be some shallow anticyclonic flow along the I-25 Corridor which could keep winds down and bring a few snow showers. We'll continue to monitor this dynamic storm, but for now the brunt of the winter impacts appear to stay well to our north/northeast. Dry conditions should return Saturday as the storm slowly pulls away, with a slow warmup expected Sunday and Monday. Then, another short wave may kick across the state by Tuesday with a few snow showers in the mountains and a return of strong, gusty winds. && .AVIATION...(For the 06Z TAFS through 06Z Tuesday night) Issued at 214 AM MDT Tue Apr 10 2018 VFR conditions today and tonight. Drainage winds will continue thru mid morning and then become light southwest by 15z. Winds by midday look to be light and variable followed by a gradualy shift to the west northwest after 21z. By 02z winds will shift back to the southwest and then to the south southwest by 06z. && .FIRE WEATHER... Issued at 330 AM MDT Tue Apr 10 2018 Fire danger will increase across all of the Front Range Foothills, Park County, and Plains on Wednesday due to warmer temperatures, very low humidities, and gusty winds. Peak gusts should reach 25-35 mph across the plains, and up to 45 mph in the foothills. RH will drop to 9-15%, and fuels have not greened up sufficiently so we've issued a Red Flag Warning from 11 AM through 7 PM Wednesday. On Thursday, fire danger may elevate further with stronger winds. Right now, it appears extreme conditions may develop from Park county and the Southern Foothills across the Palmer Divide area. We're uncertain as to how far north the critical or extreme conditions would spread, but there's enough confidence to issue a Red Flag Warning for Thursday as far north as the Denver metro area to Akron. Later shifts can adjust further as necessary. Thursday's event may also end later than normal as a frontal wind shift arrives in the evening. && .BOU WATCHES/WARNINGS/ADVISORIES... Red Flag Warning from 11 AM to 7 PM MDT Wednesday for COZ214>216- 238>251. Red Flag Warning from 10 AM to 9 PM MDT Thursday for COZ214-216- 239>241-245>247-249. && SHORT TERM...RPK LONG TERM...Barjenbruch AVIATION...RPK FIRE WEATHER...Barjenbruch
Hazardous weather outlook, Apr 9, 10:44 AM MDT, 17 hours before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1044 AM MDT Mon Apr 9 2018 COZ030>051-101645- 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- 1044 AM MDT Mon Apr 9 2018 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Snow showers will continue decrease over the mountains today. Additional snowfall is expected to be less than 2 inches. Isolated rain and snow showers will continue through mid to late afternoon across the lower elevation. No snow accumulations is expected. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday For Tuesday through Thursday well above normal temperatures are expected along with increasing fire danger across the Plains Wednesday and Thursday. Another storm will impact Colorado late Thursday into Friday, with snow in the mountains, and very windy conditions over the plains. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today or tonight.
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 3:44 AM MDT | Red Flag Warning | BOU | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 10 more | 65 hr |
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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.