FTB 05-30-2015: After A Long Active Stretch, Finally A Quieter Day In Store

Issue date: May 30th, 2015
Issue time: 9:10AM MDT

— LOW flood threat for Arkansas River from Pueblo through La Junta

Today’s water vapor image, below, shows something that we have almost forgot exists: a ridge of high pressure scooting eastward towards Colorado. This ridge will promote downward motion across our state, resulting in lower moisture content and a reduced chance of rainfall. This kind of pattern has certainly been a commodity this spring.

watervapor_20150530

This morning, we see most of the state covered in sunshine with the exception of some low-clouds in the Northeast and Southeast Plains. These clouds will quickly evaporate in a few hours once the atmosphere begins mixing in dry air from above. We expect sunshine to rule the land this morning. By early afternoon, scattered clouds will develop mainly over the higher terrain. Scattered weak thunderstorms will develop by mid-afternoon mainly across the higher terrain east of the Divide. Precipitable water values are in the 0.4 to 0.6 inch range, while dewpoints are expected to fall into the 20s to near 40F later this afternoon. Thus, one-hour rainfall from these storms will be 0.5 inches or less, and no flood threat is required.

A Low flood threat remains in place for the Arkansas from Pueblo trough La Junta, but we expect levels to recede slowly today. The river may final subside below flood status by tomorrow.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below (hover over threat areas for more details). For Zone-Specific forecasts, jump below the map.

Flood Threat Legend

Zone-Specific Forecasts

Southwest Slope, Northwest Slope, Grand Valley, and San Luis Valley:

Sunny early with scattered clouds developing by early afternoon. Very warm with temperatures topping out in the low 90s in the lowest elevations. An isolated thunderstorm cannot be ruled out, however, little if any rainfall will reach the ground. No flooding is expected today.

Northern Mountains, Central Mountains and San Juan Mountains:

Sunny early, then partly cloudy with isolated showers and storms developing by early afternoon. Maximum rain rates will be 0.3 inches per hour. No flooding is expected.

Front Range, Urban Corridor, Northeast Plains:

Sunny early with scattered clouds developing by early afternoon. An isolated storm cannot be ruled out but rainfall will be limited to 0.2 inches per hour.

Palmer Divide, Southeast Plains, Southeast Mountains, Raton Ridge:

Sunny early, then scattered showers and thunderstorms developing by early afternoon. Hourly rain rates up to 0.5 inches are possible, along with some small hail and gusty winds. No flash flooding is expected. A Low flood threat continues to be in effect for the Arkansas River from Pueblo through La Junta.