FTB 09-14-2018: Persistent Ridge Equals another Day of Summer-like Conditions for Colorado

Issue Date: Friday, September 14th, 2018
Issue Time: 08:45AM MDT

 — Flooding is NOT expected today

Another crystal clear start to the day with little change in the dry and warm air mass over the state. Not much movement in the trough pattern over the west coast either, though the upper-level jet will start to pull northward throughout the day. This should reduce areal coverage of higher surface winds across western CO and decrease fire weather over most areas from critical levels to enhanced levels. With such dry fuels and low relative humidity values, extreme caution should still be observed with any activity that could produce a spark. Surface winds over the Northwest Slope are forecast to be in the 15-25 mph range. Gusts up to 40 mph will also be possible over this area. These winds paired with the dry fuels and low relativity humidity values mentioned above will produce Day 4 of a Red Flag Warning. Precipitable Water values were measured around 0.2 inches at both Denver and Grand Junction this morning, so not expecting much, if any, cloud cover again this afternoon. With severe clear skies, flooding is not expected today.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below. For Zone-Specific forecasts, scroll below the map.

Zone-Specific Forecasts:

Southeast Plains, Palmer Ridge, Urban Corridor, Northeast Plains, Raton Ridge, Southeast Mountains, Front Range, San Juan Mountains, San Luis Valley:

Above average temperatures expected again this afternoon with blue skies. Some higher wind speeds are expected over the eastern plains, but higher dew points should keep the area from reaching critical fire weather thresholds. Similar to yesterday, not expecting much, if any, cloud cover this afternoon and evening. Still a lot of enhanced fire weather for these regions, so caution should continue to be used with any activity that could produce a spark.

Grand Valley, Central Mountains, Northern Mountains, Southwest Slope, Northwest Slope:

With the upper-level jet pulling back northwards a bit, the stronger surface winds should be confined to the Northwest Slope. Synced with another day of low relativity humidity and dry fuels, this will produce Day 4 of a Red Flag Warning. Surface winds today will likely be between 15 and 25 mph with gust up to 40mph possible. Please use extreme caution with any activity that can produce a spark. The Red Flag Warning is in effect from 10AM to 9PM. Though still not great conditions for fighting the Silver Creek Fire, the reduced surface winds should be a slight improvement from yesterday.