Weather Alerts For Amherst, CO

# HEADLINE -------------------- RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO MIDNIGHT MDT WEDNESDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS, URBAN CORRIDOR, PLAINS, AND SOUTH PARK FIRE WEATHER WATCH REMAINS IN EFFECT FROM THURSDAY MORNING THROUGH THURSDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTHERN FOOTHILLS, URBAN CORRIDOR, PLAINS, AND SOUTH PARK # DETAILS -------------------- AFFECTED AREA Fire Weather Zones 214, 216, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250 and 251. TIMING For the Red Flag Warning, from 10 AM Wednesday to midnight MDT Wednesday night. For the Fire Weather Watch, from Thursday morning through Thursday evening. WINDS For the Red Flag Warning, west 20 to 30 mph with gusts up to 45 mph. For the Fire Weather Watch, northwest winds gusting up to 50 mph. RELATIVE HUMIDITY For the Red Flag Warning, 5 to 8 percent. For the Fire Weather Watch, as low as 10 percent. IMPACTS Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. ISSUED AT Tuesday, April 21, 2026 at 11:53 PM MDT ISSUED BY National Weather Service Denver/Boulder CO HEADER URGENT - FIRE WEATHER MESSAGE # 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. # AREAS AFFECTED -------------------- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County, Central and East Adams and Arapahoe Counties, Elbert/Central and East Douglas Counties Above 6000 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, Logan County, North and Northeast Elbert County Below 6000 Feet/North Lincoln County, North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County, Northeast Weld County, Southeast Elbert County Below 6000 Feet/South Lincoln County, Central and South Weld County, Central and Southeast Park County, Morgan County, Phillips County, Sedgwick County, Washington County

# HEADLINE -------------------- RED FLAG WARNING REMAINS IN EFFECT FROM 10 AM WEDNESDAY TO MIDNIGHT MDT WEDNESDAY NIGHT FOR WIND AND LOW RELATIVE HUMIDITY FOR THE FRONT RANGE FOOTHILLS, URBAN CORRIDOR, PLAINS, AND SOUTH PARK FIRE WEATHER WATCH REMAINS IN EFFECT FROM THURSDAY MORNING THROUGH THURSDAY EVENING FOR WIND AND LOW RELATIVE HUMIDITY FOR SOUTHERN FOOTHILLS, URBAN CORRIDOR, PLAINS, AND SOUTH PARK # DETAILS -------------------- AFFECTED AREA Fire Weather Zones 214, 216, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250 and 251. TIMING For the Red Flag Warning, from 10 AM Wednesday to midnight MDT Wednesday night. For the Fire Weather Watch, from Thursday morning through Thursday evening. WINDS For the Red Flag Warning, west 20 to 30 mph with gusts up to 45 mph. For the Fire Weather Watch, northwest winds gusting up to 50 mph. RELATIVE HUMIDITY For the Red Flag Warning, 5 to 8 percent. For the Fire Weather Watch, as low as 10 percent. IMPACTS Conditions will be favorable for rapid fire spread. Avoid outdoor burning and any activity that may produce a spark and start a wildfire. ISSUED AT Tuesday, April 21, 2026 at 11:53 PM MDT ISSUED BY National Weather Service Denver/Boulder CO HEADER URGENT - FIRE WEATHER MESSAGE # 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. # AREAS AFFECTED -------------------- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County, Central and East Adams and Arapahoe Counties, Elbert/Central and East Douglas Counties Above 6000 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, Logan County, North and Northeast Elbert County Below 6000 Feet/North Lincoln County, North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County, Northeast Weld County, Southeast Elbert County Below 6000 Feet/South Lincoln County, Central and South Weld County, Central and Southeast Park County, Morgan County, Phillips County, Sedgwick County, Washington County

There is a Marginal Severe Storm Risk for your location. Continue reading for today's outlook from the National Weather Service's Storm Prediction Center. -------------------- National Severe Storm Outlook THERE IS A MARGINAL RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON/EVENING FOR PARTS OF THE HIGH PLAINS/NORTHERN PLAINS...AND FROM NORTHEAST INDIANA INTO NORTHERN OHIO SUMMARY Isolated strong-severe thunderstorms with strong gusts and hail will be possible across parts of the High Plains this afternoon and evening, as well as from northeast Indiana into northern Ohio. High Plains this afternoon/evening In response to a shortwave trough digging south-southeastward over BC/AB, a closed low over the Great Basin will evolve into a more open wave and eject northeastward to the northern High Plains by early Thursday. An associated, deep lee cyclone will develop eastward from MT to near the ND/SK border, with a lee trough extending southward into the central/southern High Plains. East of the lee trough, low-level moisture (boundary-layer dewpoints in the 55-60 F range) will spread northward today from TX/OK to KS/NE. Diurnal mixing will likely limit the quality of the moisture farther north into the Dakotas. Thus, a few high-based thunderstorms will be possible this afternoon/evening from NE into SD along the lee trough with deep mixing, where inverted-v profiles will favor strong outflow gusts. A narrow zone of moderate buoyancy is expected along the dryline from southwest NE and western KS into west TX, where deep-layer vertical shear will be sufficient for supercells. Only limited height falls and a warm elevated mixed layer, in combination with somewhat limited parcel residence times in the dryline circulation, suggest that storm coverage will be isolated at best. There will be a conditional threat for isolated large hail with any sustained storms. Dakotas tonight The threat for thunderstorms may increase tonight as a result of ascent preceding the midlevel trough, and a modest increase in low-level moisture with a strengthening low-level jet. Much of the convection will likely be rooted above the surface, but could still produce strong outflow gusts and marginally severe hail. IN/OH this afternoon/evening Residual low-level moisture and surface heating along a diffuse baroclinic zone will support thunderstorm development this afternoon from northeast IN into northern OH. Though deep-layer wind profiles will not be particularly strong, relatively cool midlevel temperatures and weak-moderate buoyancy could support marginally severe hail and gusty outflow winds with the strongest storms.

Pollen Index: 11.7 Pollen Level: high Predominant Pollen: Ash, Willow and Elm. Concentration of pollen grains in the air for Thursday will be falling but stay in the extremely high range. This forecast of lower pollen concentration is based on falling temperatures.