Broomfield Warnings, Watches and Advisories

Flood Watch issued September 27 at 11:27PM MDT until September 30 at 6:00AM MDT by NWS Grand Junction CO

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of Colorado, including the following areas, Animas River Basin, Four Corners/Upper Dolores River, Northwest San Juan Mountains, Paradox Valley/Lower Dolores River, San Juan River Basin, Southwest San Juan Mountains and Uncompahgre Plateau and Dallas Divide and southeast Utah, including the following areas, Canyonlands/Natural Bridges, La Sal and Abajo Mountains and Southeast Utah. * WHEN...From 6 AM MDT Monday through 6 AM MDT Wednesday. * IMPACTS...Flooding will be possible over burn scars, at low-water crossings, and along creeks, streams, washes, arroyos and other flood-prone locations. Creeks and streams may rise out of their banks. Unpaved roads could become muddy and impassable. * ADDITIONAL DETAILS... - Periods of heavy rainfall, associated with remnant moisture from Hurricane Polo, are expected to produce numerous showers and embedded thunderstorms. Heavy rain falling on saturated soils and burn scars could lead to localized flash flooding and rises on local rivers. - http://www.weather.gov/safety/flood

Flood Watch issued September 27 at 11:20PM MDT until September 30 at 6:00AM MDT by NWS Pueblo CO

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...The Eastern San Juan Mountains. * WHEN...From 6 AM MDT Monday through late Tuesday night. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. * ADDITIONAL DETAILS... - Periods of heavy rainfall associated with a remnant tropical storm system will spread across southwest Colorado beginning today. - Creede, South Fork and Wolf Creek Pass. - http://www.weather.gov/safety/flood

Flood Watch issued September 27 at 11:20PM MDT until September 30 at 6:00PM MDT by NWS Pueblo CO

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Huerfano, Las Animas, Baca and Prowers Counties along with the southern Sangre de Cristo Mountains above 7500 feet. * WHEN...From Tuesday morning through Wednesday afternoon. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks. * ADDITIONAL DETAILS... - Periods of heavy rainfall associated with a remnant tropical storm system will spread across southern Colorado beginning Tuesday morning. - Lamar, Springfield, Trinidad and Walsenburg. - http://www.weather.gov/safety/flood

Hydrologic Outlook issued September 27 at 8:56PM MDT by NWS Grand Junction CO

ESFGJT Strong southwesterly winds ahead of a closed low centered over California will pull tropical moisture from Tropical Storm Odalys and Hurricane Polo towards eastern Utah and western Colorado, with atmospheric moisture peaking in our area on Monday. The northerly extent of the expected excessive rainfall poses a threat to our southern San Juan river basins. Current forecasts suggest 1 to 4 inches of rain Monday morning through early Wednesday. At face value, rivers and tributaries will see a rise due to the forecast rainfall. However, localized heavier amounts could result in flooding across the southern San Juan foothills and communities further downstream. Rivers have responded rapidly to recent rainfall due to saturated soils and increased runoff potential. Thus, prolonged periods of additional rainfall over these regions would trigger a similar response. The current precipitation forecast suggests larger peaks in several creeks and rivers than what has been recently observed. However, high end probabilistic rainfall amounts (i.e. above 90th percentile) may lead to rivers exceeding action stage to minor flooding. Most probable basins to see significant rises include; the Rio Blanco, San Juan, Piedra, Los Pinos/Vallecito Creek, and the Animas River Basins. Convective storms and periods of heavy rainfall fed from said tropical moisture could result in localized flooding impacts across the CWA. However, confidence decreases rapidly north of the San Juans. Confidence has increased enough for a Flood Watch to be issued for southern portions of the forecast area valid from 6AM Monday through 6AM Wednesday. Continue to monitor the latest forecasts especially for those who reside and/or plan to recreate in the Watch areas.

Hydrologic Outlook issued September 27 at 1:01PM MDT by NWS Grand Junction CO

ESFGJT Strong southwesterly winds ahead of a closed low centered over California will pull tropical moisture from Tropical Storm Odalys and Hurricane Polo towards eastern Utah and western Colorado, with atmospheric moisture peaking in our area on Monday. The northerly extent of the expected excessive rainfall poses a threat to our southern San Juan river basins. Current forecasts suggest 1 to 4 inches of rain Monday morning through early Wednesday. At face value, rivers and tributaries will see a rise due to the forecast rainfall. However, localized heavier amounts could result in flooding across the southern San Juan foothills and communities further downstream. Rivers have responded rapidly to recent rainfall due to saturated soils and increased runoff potential. Thus, prolonged periods of additional rainfall over these regions would trigger a similar response. The current precipitation forecast suggests larger peaks in several creeks and rivers than what has been recently observed. However, high end probabilistic rainfall amounts (i.e. above 90th percentile) may lead to rivers exceeding action stage to minor flooding. Most probable basins to see significant rises include; the Rio Blanco, San Juan, Piedra, Los Pinos/Vallecito Creek, and the Animas River Basins. Convective storms and periods of heavy rainfall fed from said tropical moisture could result in localized flooding impacts across the CWA, however, confidence decreases rapidly north of the San Juans. Confidence has increased enough for a Flood Watch to be issued for southern portions of the forecast area valid from 6am Monday through 6am Wednesday. Continue to monitor the latest forecasts especially for those who reside and/or plan to recreate in the Watch areas.

Hydrologic Outlook issued September 25 at 2:21PM MDT by NWS Grand Junction CO

ESFGJT In the wake of today's precipitation, our attention will turn to the Eastern Pacific. Tropical moisture is anticipated to spread across the Desert Southwest early next week, drawing moisture from a pair of Hurricanes; Odalys and Polo. The forecast becomes increasing complex due to a closed low currently forecast to drive across the Southwest CONUS as Hurricane Polo approaches the Baja California Peninsula. Strong southerly winds ahead of the low are expected to pull tropical moisture towards eastern Utah and western Colorado as early as Monday morning. The challenge and uncertainty in our precipitation forecast increase as the week progresses and the low traverses our southern States. Excessive rainfall is most probable over AZ and NM, attm, but the northerly extent poses a threat to our southern San Juan river basins. Current forecasts suggests 1 to 3 inches of rain over Monday morning through Wednesday. At face value, rivers and tributaries will see a bump up due to said moisture. However, localized heavier amounts could result in minor flooding across the southern San Juan foothills and communities further downstream. Rivers have responded rapidly to recent rainfall due to saturated soils and increased runoff potential. Thus, prolonged periods of additional rainfall over these regions would trigger a similar response. The current precipitation forecast suggests larger peaks in several creeks and rivers than what has been observed over the previous 7 days. However, high end probabilistic rainfall amounts (i.e. above 90th percentile) may lead to rivers exceeding action stage to minor flooding. Most probable basins to see significant rises include; the Rio Blanco, San Juan, Piedra, Los Pinos/Vallecito Creek, and the Animas River Basins. Convective storms and periods of heavy rainfall fed from said tropical moisture could result in localized flooding impacts across the CWA, however, confidence decreases rapidly north of the San Juans. Please continue to monitor the forecast as these systems evolve. Especially for those who reside and/or plan to recreate in the southwest quadrant of the forecast area.

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Broomfield.

Use the Radar Maps link provided to understand the trajectory of a storm.