Alert archive / Colorado / Red Flag Warnings in 2018
Red Flag Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this red flag warning at Apr 16, 2018, 3:45 AM MDT for 12 counties in Colorado. It took effect at Apr 17, 2018, 10:00 AM MDT. It was in force for 12 hr. 60 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 16, 2018, 3:45 AM MDT (09:45 UTC)
- In effect from
- Apr 17, 2018, 10:00 AM MDT
- Expired
- Apr 17, 2018, 10:00 PM MDT
- In force
- 12 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, Lincoln County, CO, Park County, CO
The radar
The Denver radar (KFTG), 36 km from the middle of the area, began a volume at 09:48 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 17, 10:04 AM MDT | NON-TSTM WND GST 53 | 1 Wnw Parker, CO | MESONET STATION E6996, 1 WNW PARKER. |
| Apr 17, 10:09 AM MDT | NON-TSTM WND GST 59 | 3 E Gold Hill, CO | MESONET STATION E4338, 3 E GOLD HILL. |
| Apr 17, 10:12 AM MDT | NON-TSTM WND GST 53 | 5 W Elbert, CO | AWOS STATION MNH, 5 W ELBERT. |
| Apr 17, 10:13 AM MDT | NON-TSTM WND GST 52 | 3 E Elizabeth, CO | MESONET STATION E7966, 3 E ELIZABETH. |
| Apr 17, 10:23 AM MDT | NON-TSTM WND GST 74 | 1 S Cheesman Reservoir, CO | MESONET STATION CHRC2, 1 S CHEESMAN RESERVOIR. |
| Apr 17, 10:44 AM MDT | NON-TSTM WND GST 51 | Hugo, CO | MESONET STATION E0539, HUGO. |
| Apr 17, 10:54 AM MDT | NON-TSTM WND GST 51 | 1 W Devil'S Head, CO | MESONET STATION POLC2, 1 W DEVIL'S HEAD. |
| Apr 17, 11:00 AM MDT | NON-TSTM WND GST 61 | 1 Wnw Loveland Pass, CO | MESONET STATION CALVP, 1 WNW LOVELAND PASS. |
| Apr 17, 11:10 AM MDT | NON-TSTM WND GST 57 | Wilkerson Pass, CO | MESONET STATION CO027, WILKERSON PASS. |
| Apr 17, 11:12 AM MDT | NON-TSTM WND GST 56 | Applewood, CO | MESONET STATION E7094, APPLEWOOD. |
| Apr 17, 11:25 AM MDT | NON-TSTM WND GST 54 | 7 Sw Deer Trail, CO | MESONET STATION E0812, 7 SW DEER TRAIL. |
| Apr 17, 11:40 AM MDT | NON-TSTM WND GST 53 | Limon Municipal Airport, CO | ASOS STATION LIC, LIMON MUNICIPAL AIRPORT. |
| Apr 17, 11:54 AM MDT | NON-TSTM WND GST 51 | Hugo, CO | MESONET STATION E0539, HUGO. |
| Apr 17, 12:00 PM MDT | NON-TSTM WND GST 62 | 1 Wnw Loveland Pass, CO | MESONET STATION CALVP, 1 WNW LOVELAND PASS. |
| Apr 17, 12:12 PM MDT | NON-TSTM WND GST 62 | Berthoud Pass, CO | AWOS STATION 0CO, BERTHOUD PASS. |
| Apr 17, 1:35 PM MDT | NON-TSTM WND GST 62 | 1 S Hygiene, CO | AWOS STATION LMO, 1 S HYGIENE. |
| Apr 17, 1:51 PM MDT | NON-TSTM WND GST 71 | 4 Se Pinecliffe, CO | SNOW SQUALL WITH ZERO VISIBILITY AND 0.2 INCHES SNOW; SUNNY 15 MINUTES LATER. |
| Apr 17, 1:53 PM MDT | NON-TSTM WND GST 60 | Jeffco Airport, CO | AWOS STATION BJC, JEFFCO AIRPORT. |
| Apr 17, 2:01 PM MDT | NON-TSTM WND GST 66 | 1 Ne Hygiene, CO | MESONET STATION AU469, 1 NE HYGIENE. |
| Apr 17, 2:05 PM MDT | NON-TSTM WND GST 72 | 2 Nnw Longmont, CO | MESONET STATION E2670, 2 NNW LONGMONT. |
| Apr 17, 2:07 PM MDT | NON-TSTM WND GST 62 | 2 Ene Longmont, CO | MESONET STATION AR720, 2 ENE LONGMONT. |
| Apr 17, 2:10 PM MDT | NON-TSTM WND GST 59 | Limon Municipal Airport, CO | ASOS STATION LIC, LIMON MUNICIPAL AIRPORT. |
| Apr 17, 2:10 PM MDT | NON-TSTM WND GST 68 | 2 Ne White Ranch Open S, CO | MESONET STATION UP709, 2 NE WHITE RANCH OPEN S. |
| Apr 17, 2:12 PM MDT | NON-TSTM WND GST 62 | 2 Se Wattenburg, CO | |
| Apr 17, 2:12 PM MDT | NON-TSTM WND GST 68 | 1 E Boulder, CO | AWOS STATION BDU, 1 E BOULDER. |
| Apr 17, 2:14 PM MDT | NON-TSTM WND GST 59 | 4 W Buckley Angb, CO | MESONET STATION CO024, 4 W BUCKLEY ANGB. |
| Apr 17, 2:14 PM MDT | NON-TSTM WND GST 60 | 1 Sw Pleasant View, CO | MESONET STATION CO008, 1 SW PLEASANT VIEW. |
| Apr 17, 2:15 PM MDT | NON-TSTM WND GST 61 | 1 Nne Boulder, CO | |
| Apr 17, 2:18 PM MDT | NON-TSTM WND GST 83 | 2 Nw Rocky Flats, CO | |
| Apr 17, 2:20 PM MDT | NON-TSTM WND GST 63 | 4 Ese Erie, CO | MESONET STATION CO010, 4 ESE ERIE. |
| Apr 17, 2:21 PM MDT | NON-TSTM WND GST 67 | 2 Nw Brighton, CO | DUST AND SNAPPED TREE LIMBS. |
| Apr 17, 2:22 PM MDT | NON-TSTM WND GST 64 | 2 Wsw Gunbarrel, CO | MESONET STATION D0417, 2 WSW GUNBARREL. |
| Apr 17, 2:22 PM MDT | NON-TSTM WND GST 67 | Superior, CO | MESONET STATION D7772, SUPERIOR. |
| Apr 17, 2:25 PM MDT | NON-TSTM WND GST 81 | 3 N Eldorado Springs, CO | |
| Apr 17, 2:40 PM MDT | NON-TSTM WND GST 72 | 4 Ese Erie, CO | MESONET STATION CO010, 4 ESE ERIE. |
| Apr 17, 2:45 PM MDT | NON-TSTM WND GST 86 | Jeffco Airport, CO | AWOS STATION BJC, JEFFCO AIRPORT. |
| Apr 17, 3:03 PM MDT | NON-TSTM WND DMG | Northglenn, CO | 3 INCH DIAMETER TREE BRANCHES SNAPPED OFF TREES. |
| Apr 17, 3:05 PM MDT | NON-TSTM WND GST 71 | 2 Se Wattenburg, CO | HEAVY DUST, DEBRIS, BROKEN TREE LIMBS. |
| Apr 17, 3:05 PM MDT | NON-TSTM WND GST 71 | 2 Se Wattenburg, CO | HEAVY DUST, DEBRIS, BROKEN TREE LIMBS. |
| Apr 17, 3:08 PM MDT | NON-TSTM WND GST 58 | 2 Ne Thornton, CO | MESONET STATION C9688, 2 NE THORNTON. |
| Apr 17, 3:08 PM MDT | NON-TSTM WND DMG | 1 N Mountain View, CO | MULTIPLE TREES BLOWN OVER ONTO CARS. BIGGEST TREE BLOWN OVER WAS 80 FEET TALL WITH A BASE OF 25 INCHES IN DIAMETER. |
| Apr 17, 3:09 PM MDT | NON-TSTM WND GST 60 | 2 S Longmont, CO | NUMEROUS SMALL BRANCHES DOWN DOWN, SOME LARGER LIMBS ALSO SNAPPED OFF OF TREES, POWER OUTAGES REPORTED IN LONGMONT. |
| Apr 17, 3:10 PM MDT | NON-TSTM WND GST 78 | 3 E Gold Hill, CO | MESONET STATION E4338, 3 E GOLD HILL. |
| Apr 17, 3:13 PM MDT | NON-TSTM WND GST 70 | 2 Sse Gold Hill, CO | MESONET STATION E4131, 2 SSE GOLD HILL. |
| Apr 17, 3:15 PM MDT | NON-TSTM WND GST 62 | 5 S Lyons, CO | MESONET STATION E8833, 5 S LYONS. |
| Apr 17, 3:18 PM MDT | NON-TSTM WND GST 59 | 1 Sse Rocky Flats, CO | MESONET STATION F1909, 1 SSE ROCKY FLATS. |
| Apr 17, 3:18 PM MDT | NON-TSTM WND GST 59 | 2 S Erie, CO | MESONET STATION E1146, 2 S ERIE. |
| Apr 17, 3:27 PM MDT | NON-TSTM WND GST 58 | Floyd Hill, CO | MESONET STATION CO071, FLOYD HILL. |
| Apr 17, 3:27 PM MDT | NON-TSTM WND GST 58 | Kassler, CO | MESONET STATION F0417, KASSLER. |
| Apr 17, 3:32 PM MDT | NON-TSTM WND GST 63 | Beverly Hills, CO | MESONET STATION CO073, BEVERLY HILLS. |
| Apr 17, 3:40 PM MDT | NON-TSTM WND GST 62 | 3 E Denver, CO | MESONET STATION CO011, 3 E DENVER. |
| Apr 17, 3:40 PM MDT | NON-TSTM WND GST 70 | Denver International Ai, CO | ASOS STATION DEN, DENVER INTERNATIONAL AIRPORT. |
| Apr 17, 3:43 PM MDT | NON-TSTM WND GST 64 | 9 N Manila Village, CO | MESONET STATION E6017, 9 N MANILA VILLAGE. |
| Apr 17, 3:47 PM MDT | NON-TSTM WND GST 58 | 2 Nw Genesee, CO | MESONET STATION CO065, 2 NW GENESEE. |
| Apr 17, 3:48 PM MDT | NON-TSTM WND GST 60 | Centennial Airport, CO | ASOS STATION APA, CENTENNIAL AIRPORT. |
| Apr 17, 3:57 PM MDT | NON-TSTM WND GST 59 | 3 Ene Parker, CO | MESONET STATION E4043, 3 ENE PARKER. |
| Apr 17, 4:06 PM MDT | NON-TSTM WND GST 67 | 1 N Buckley Angb, CO | AWOS STATION BKF, 1 N BUCKLEY ANGB. |
| Apr 17, 4:10 PM MDT | NON-TSTM WND GST 59 | 1 W Brighton, CO | MESONET STATION UP727, 1 W BRIGHTON. |
| Apr 17, 4:10 PM MDT | NON-TSTM WND GST 89 | 1 E Louisville, CO | SUSTAINED WIND SPEED OF 70MPH. PEAK GUST UP TO 89MPH. REPORT VIA TWITTER. |
| Apr 17, 4:21 PM MDT | NON-TSTM WND GST 67 | 1 Ese Strasburg, CO | MESONET STATION D9756, 1 ESE STRASBURG. |
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, 9.8 hours before the alert went out and 145 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
- 2657 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 300 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
026 WWUS85 KBOU 160945 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 345 AM MDT Mon Apr 16 2018 ...Extreme Fire Danger on Tuesday over the Palmer Divide, eastern areas of Adams and Arapahoe counties, eastern Elbert and Lincoln counties... COZ241-245>247-161745- /O.UPG.KBOU.FW.A.0009.180417T1600Z-180418T0200Z/ /O.NEW.KBOU.FW.W.0018.180417T1600Z-180418T0200Z/ 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- 345 AM MDT Mon Apr 16 2018 ...RED FLAG WARNING IN EFFECT FROM 10 AM TO 8 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE, EASTERN PORTIONS OF ADAMS AND ARAPAHOE COUNTIES AND OVER EASTERN ELBERT AND LINCOLN 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 8 PM MDT Tuesday. The Fire Weather Watch is no longer in effect. * Affected Area...Fire Weather Zones 241...245...246 and 247. * Timing...Late Tuesday morning through early Tuesday evening * Winds...West 30 to 40 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. 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. && $$
7 follow-up statements
905 WWUS85 KBOU 161950 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 150 PM MDT Mon Apr 16 2018 ...Extreme Fire Danger on Tuesday over the Palmer Divide, eastern areas of Adams and Arapahoe counties, eastern Elbert and Lincoln counties... COZ241-245>247-171200- /O.CON.KBOU.FW.W.0018.180417T1600Z-180418T0200Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 150 PM MDT Mon Apr 16 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 8 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE, EASTERN PORTIONS OF ADAMS AND ARAPAHOE COUNTIES AND OVER EASTERN ELBERT AND LINCOLN COUNTIES... * Affected Area...Fire Weather Zones 241...245...246 and 247. * Timing...Late Tuesday morning through early Tuesday evening * Winds...West 30 to 40 mph with gusts up to 50 mph. * Relative Humidity...As low as 9 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$
180 WWUS85 KBOU 170444 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1044 PM MDT Mon Apr 16 2018 ...Extreme Fire Danger on Tuesday over the Palmer Divide, eastern areas of Adams and Arapahoe counties, eastern Elbert and Lincoln counties... COZ241-245>247-171245- /O.CON.KBOU.FW.W.0018.180417T1600Z-180418T0200Z/ 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- 1044 PM MDT Mon Apr 16 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM TO 8 PM MDT TUESDAY FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE, EASTERN PORTIONS OF ADAMS AND ARAPAHOE COUNTIES AND OVER EASTERN ELBERT AND LINCOLN COUNTIES... * Affected Area...Fire Weather Zones 241...245...246 and 247. * Timing...Late Tuesday morning through early Tuesday evening * Winds...West 30 to 40 mph with gusts up to 60 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. 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. && $$
999 WWUS85 KBOU 171049 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 449 AM MDT Tue Apr 17 2018 ...Critical to Extreme Fire Danger today over the Denver Metro area, Palmer Divide, Adams and Arapahoe counties, Elbert and Lincoln counties, South Park and the southern Foothills... COZ214-216-171900- /O.EXB.KBOU.FW.W.0018.180417T1600Z-180418T0000Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 449 AM MDT Tue Apr 17 2018 ...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 6 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK AND THE SOUTHERN FOOTHILLS... The National Weather Service in Denver has issued a Red Flag Warning FOR WIND AND LOW RELATIVE HUMIDITY, which is in effect from 10 AM this morning to 6 PM MDT this evening. * Affected Area...Fire Weather Zones 214 and 216. * Timing...Late this morning through early this evening. * Winds...West 25 to 40 mph with gusts up to 60 mph. * Relative Humidity...As low as 14 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ239-240-171900- /O.EXA.KBOU.FW.W.0018.180417T1600Z-180418T0200Z/ 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- 449 AM MDT Tue Apr 17 2018 ...RED FLAG WARNING IN EFFECT FROM 10 AM THIS MORNING TO 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE DENVER METRO AREA... 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 this morning to 8 PM MDT this evening. * Affected Area...Fire Weather Zones 239 and 240. * Timing...Late this morning through early this evening. * Winds...West 30 to 40 mph with gusts up to 60 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. 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. && $$ COZ245>247-171900- /O.CON.KBOU.FW.W.0018.180417T1600Z-180418T0200Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 449 AM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR EASTERN PORTIONS OF ADAMS AND ARAPAHOE COUNTIES AND OVER EASTERN ELBERT AND LINCOLN COUNTIES... * Affected Area...Fire Weather Zones 245...246 and 247. * Timing...Late this morning through early this evening. * Winds...West 35 to 45 mph with gusts up to 60 mph. * Relative Humidity...As low as 8 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ241-171900- /O.CON.KBOU.FW.W.0018.180417T1600Z-180418T0200Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- 449 AM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE... * Affected Area...Fire Weather Zone 241. * Timing...Late this morning through early this evening. * Winds...West 30 to 40 mph with gusts up to 60 mph. * 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... 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. && $$
614 WWUS85 KBOU 171849 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 1249 PM MDT Tue Apr 17 2018 ...Critical to Extreme Fire Danger today over the Denver Metro area, Palmer Divide, Adams and Arapahoe counties, Elbert and Lincoln counties, South Park and the southern Foothills... COZ245>247-180200- /O.CON.KBOU.FW.W.0018.000000T0000Z-180418T0200Z/ Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 1249 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR EASTERN PORTIONS OF ADAMS AND ARAPAHOE COUNTIES AND OVER EASTERN ELBERT AND LINCOLN COUNTIES... * Affected Area...Fire Weather Zones 245...246 and 247. * Timing...Through early this evening. * Winds...West 35 to 45 mph with gusts up to 65 mph. * Relative Humidity...As low as 6 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ214-216-180000- /O.CON.KBOU.FW.W.0018.000000T0000Z-180418T0000Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 1249 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 6 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK AND THE SOUTHERN FOOTHILLS... * Affected Area...Fire Weather Zones 214 and 216. * Timing...Through early this evening. * Winds...West 20 to 30 mph with gusts up to 55 mph. * Relative Humidity...As low as 13 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. 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. && $$ COZ239-240-180200- /O.CON.KBOU.FW.W.0018.000000T0000Z-180418T0200Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- 1249 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE DENVER METRO AREA... * Affected Area...Fire Weather Zones 239 and 240. * Timing...Through early this evening. * Winds...West 30 to 40 mph with gusts up to 55 mph. * Relative Humidity...As low as 8 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ241-180200- /O.CON.KBOU.FW.W.0018.000000T0000Z-180418T0200Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- 1249 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE... * Affected Area...Fire Weather Zone 241. * Timing...Through early this evening. * Winds...West 30 to 40 mph with gusts up to 60 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... 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. && $$
569 WWUS85 KBOU 180002 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 602 PM MDT Tue Apr 17 2018 ...FIRE DANGER WILL SLOWLY IMPROVE THIS EVENING... Humidities are beginning to recover as temperatures cool, and this trend will continue through the evening. Winds will also be slowly diminishing, easing the fire danger threat. COZ214-216-180115- /O.EXP.KBOU.FW.W.0018.000000T0000Z-180418T0000Z/ Central and Southeast Park County- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- 602 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING WILL EXPIRE AT 6 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTH PARK AND THE FRONT RANGE FOOTHILLS... Humidities have improved into the 30 to 45 percent range this evening. Winds will slowly subside through the rest of the evening as well, so the Red Flag Warning for Zones 214 and 216 has been allowed to expire. $$ COZ245>247-180200- /O.CON.KBOU.FW.W.0018.000000T0000Z-180418T0200Z/ 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- 602 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR EASTERN ADAMS...EASTERN ARAPAHOE...EASTERN ELBERT...AND LINCOLN COUNTIES... * Affected Area...Fire Weather Zones 245...246 and 247. * Timing...Through early this evening. * Winds...Northwest 30 to 40 mph with gusts up to 60 mph, decreasing to 20 to 30 mph with gusts to 40 mph by 8 PM. * Relative Humidity...As low as 15 percent early this evening. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. 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. && $$ COZ239-240-180200- /O.CON.KBOU.FW.W.0018.000000T0000Z-180418T0200Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- 602 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR DENVER METRO AREA * Affected Area...Fire Weather Zones 239 and 240. * Timing...Through early this evening. * Winds...Northwest 20 to 30 mph with gusts up to 50 mph. * Relative Humidity...Improving to around 30 percent this evening. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior. && $$ COZ241-180200- /O.CON.KBOU.FW.W.0018.000000T0000Z-180418T0200Z/ Elbert/Central and East Douglas Counties Above 6000 Feet- 602 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 8 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR THE PALMER DIVIDE AREA... * Affected Area...Fire Weather Zone 241. * Timing...Through early this evening. * Winds...Northwest 20 to 30 mph with gusts up to 50 mph. * Relative Humidity...Slowly improving to around 30 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire growth. Extreme fire behavior is possible. 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. && $$
944 WWUS85 KBOU 180159 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 759 PM MDT Tue Apr 17 2018 ...FIRE DANGER WILL SLOWLY IMPROVE THIS EVENING... Humidities are beginning to recover as temperatures cool, and this trend will continue through the evening. Winds will also be slowly diminishing, easing the fire danger threat. COZ239>241-245-180300- /O.CAN.KBOU.FW.W.0018.000000T0000Z-180418T0200Z/ Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Central and East Adams and Arapahoe Counties- 759 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING HAS EXPIRED FOR FIRE WEATHER ZONES 239..240..241..AND 245 IN NORTHEAST cOLORADO... The National Weather Service in Denver has allowed the Red Flag Warning to expire for the I-25 urban corridor in northeast Colorado. Wind speeds have decreased and relative humidities have increased, thereby reducing the risk of large fire growth and spread. $$ COZ246-247-180400- /O.EXT.KBOU.FW.W.0018.000000T0000Z-180418T0400Z/ North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 759 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING HAS BEEN EXTENDED UNTIL 10 PM MDT THIS EVENING FOR STRONG WINDS AND ONGOING WILDFIRES FOR FIRE WEATHER ZONES 246 AND 247 IN EAST CENTRAL COLORADO... * Affected Area...Fire Weather Zones 246 and 247. * Timing...Until 10 PM MDT this evening. * Winds...Northwest 25 to 40 mph with gusts up to 55 mph. * Relative Humidity...As low as 25 percent. * Impacts...Conditions will be favorable for new fire starts and rapid fire spread. Extreme fire behavior is possible. 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. && $$ Baker
487 WWUS85 KBOU 180357 RFWBOU URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 957 PM MDT Tue Apr 17 2018 COZ246-247-180500- /O.EXP.KBOU.FW.W.0018.000000T0000Z-180418T0400Z/ North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- 957 PM MDT Tue Apr 17 2018 ...RED FLAG WARNING WILL EXPIRE AT 10 PM MDT THIS EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR FIRE WEATHER ZONES 246 AND 247... Humidities have increased sufficiently and winds are slowly decreasing late this evening. Conditions will continue to improve overnight. $$
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 Apr 15, 8:50 PM MDT, 6 hours 55 minutes earlier.
Area forecast discussion, Apr 15, 8:50 PM MDT, 6 hours 55 minutes before
Area Forecast Discussion National Weather Service Denver/Boulder CO 850 PM MDT Sun Apr 15 2018 .UPDATE... Issued at 838 PM MDT Sun Apr 15 2018 High pressure ridge aloft over Colorado tonight with some mid and upper level moisture beginning to stream into the state from the west and southwest. Airmass has stabilized after a few showers tried to get started over the higher terrain, but since has dissipated. Will still carry quite a bit of cloudiness over mountains tonight, but just thin cirrus further east. No other changes needed. && .SHORT TERM...(This afternoon through Monday) Issued at 230 PM MDT Sun Apr 15 2018 Weather is expected to be warmer and drier through Monday with high pressure aloft. GOES 16 satellite shows high clouds moving across the Great Basin which will spread east over the Colorado Rocky Mountains through the day. On Monday high temperatures will be about 10 to 15 degrees F warmer than today. A deepening surface trough over the Front Range Foothills will lead to winds up to 25 mph over the plains during the afternoon and evening. .LONG TERM...(Monday night through Saturday) Issued at 230 pM MDT Sun Apr 15 2018 Monday night, a increasing southwesterly flow aloft will be over Colorado ahead of the next system, moving into western UT. The models show weak moderate mid level qg ascent developing after 06z. NAM12 spatial cross-sections show a short lived amplified mountain wave profile in the 06-09z window. Stronger winds would impact the east slopes of the Front Range Mountains and higher foothills, with some gusts around 60 mph. Overall, the airmass appears to be fairly dry over most of the cwa except zones 30>32. Tuesday and Tuesday night, the trough axis is expected to move across the cwa. Strong but fairly brief mid level qg ascent will be present near the CO/WY border at 18z Tuesday, then strong downward subsidence kicks in the late afternoon and evening period. In the mountains, southwest wind level winds will switch to the northwest. Light to moderate snowfall will be possible, with potential amounts in the 3-6 inch range. Across the northeast plains, gusty southwest winds will be present in the morning, especially along the Palmer Divide then stronger west/northwest winds will spread across the northeast plains with the passage of the cold front on or after 21z in the afternoon. Bora type of winds with good mid level instability, subsidence and cold air advection helping to mix the stronger winds to the surface. Not thinking highlights at this time, but could see gusts in the 45-55 mph range during the late aftn/evng period. Wednesday and Thursday, a ridge of high pressure will shift over the state with the mid level axis over central CO around 00z Thu. In the mountains, some residual orographic snow showers along the west facing slopes early then dry. Over the northeast plains, could see some gusty northwest winds over the far northeast plains, with a lighter north/northeast wind component over the rest of the lower elevations. Wednesday night into Thursday, the ridge axis shifts to the east with an increasing southwesterly flow developing over the region in the afternoon ahead of the next storm system. Gusty southwesterly winds will develop in the mountains by that time, with southerly winds increasing across the northeast plains. This should result in some moderation in temperatures from Wednesday to Thursday. The next potential impact for much of the cwa will occur in the Friday to Saturday period. The models all show a closed upper trough over the Great Basin Thu aftn, intensifying and shifting eastward across southern CO by midday Friday. This type of system could provide sustained and deep easterly upslope and widespread precipitation as it advects moisture from the Gulf of Mexico into eastern CO. The eastward progression of the trough appears to slow down Friday afternoon and Friday night which would also help to produce moderate to heavy snow/rain. This would result in heavy snowfall for the mountains and foothills, with a mix of snow/rain across the eastern plains. There are some timing/track issues however that crop up at that point. The GFS keeps the sfc and upper low in a more favorable location of southeast CO midday Friday, while the ECMWF is further west with the upper low and further south with the sfc trough. This would shift the focus into southeast CO. Too many details to get caught in the weeds with at this time. For now will maintain likely pops in the grids, especially from the Front Range eastward across the plains. && .AVIATION...(For the 00Z TAFS through 00Z Monday evening) Issued at 838 PM MDT Sun Apr 15 2018 Surface winds till a bit more east and southeast after weak surge moved in from the east. Expect winds to shift southeast this evening and then more southerly after midnight. weak cyclone may end up resulting in winds more northwest at BJC later tonight. For cloud cover, just sct-bkn mid and high level clouds expected. && .FIRE WEATHER... Issued at 230 PM MDT Sun Apr 15 2018 On Monday there will be near red flag conditions across the Palmer Divide with some gusty winds expected. Due to the short duration for these conditions, there will be no highlight issued at this time. On Tuesday fire danger will increase over South Park, the Foothills and along the Front Range extending southeast towards the Limon area. This will be due to expected very windy conditions ahead of and behind a Pacific front and low humidity values. Consequently a Fire Weather Watch has been issued for the following fire weather zones listed below. && .BOU WATCHES/WARNINGS/ADVISORIES... Fire Weather Watch from Tuesday morning through Tuesday evening for COZ241-245>247. && UPDATE...Entrekin SHORT TERM...Sullivan LONG TERM...Cooper AVIATION...Entrekin FIRE WEATHER...Cooper
Hazardous weather outlook, Apr 15, 9:49 AM MDT, 17 hours 56 minutes before
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 949 AM MDT Sun Apr 15 2018 COZ030>051-161600- 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- 949 AM MDT Sun Apr 15 2018 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Clouds over the mountains may produce scattered flurries through early afternoon. Drier weather is expected across Colorado by midday. No hazardous weather is expected at this time across the northeast Colorado plains. .DAYS TWO THROUGH SEVEN...Monday through Saturday Monday will be dry and warmer. Tuesday and Tuesday night, an upper level disturbance will bring a good chance of snow to the mountains, with mostly dry but very windy conditions over the northeast plains. It will be a little cooler with the passage of a cold front Tuesday afternoon. Wednesday and Thursday will be dry with seasonal temperatures. Another Pacific storm system may affect the area on Friday into Saturday bringing cooler temperatures along with a good chance of precipitation to the region. .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 16, 2:16 PM MDT | High Wind Watch | BOU | Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert and 7 more | 18 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.