Flash Flood Watch

The Monsoonal flow was well advertised. It arrived just when the models predicted and the precipitation amounts have been very close to what was predicted. Everything has gone pretty well, but as I mentioned a few days ago the monsoonal flow is going to take a break.

The ridge is going to pop back up and shut off the flow. I would expect some recycled moisture to hang out for a while leading to more isolated thunderstorms. We should see that downtick in activity beginning in the Wednesday/Thursday timeframe. Until then we will continue to see showers and thunderstorms, especially this afternoon and evening with scattered showers throughout the day on Tuesday.

The NWS released a Flood watch beginning at noon today.

/O.NEW.KGJT.FF.A.0002.200727T1800Z-200728T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SOUTHWEST SAN JUAN MOUNTAINS-ANIMAS RIVER BASIN-SAN JUAN RIVER BASIN-
INCLUDING THE CITIES OF IGNACIO, SILVERTON, DURANGO, BAYFIELD, RICO,
PAGOSA SPRINGS, AND HESPERUS
218 AM MDT MON JUL 27 2020

…FLASH FLOOD WATCH IN EFFECT FROM NOON MDT TODAY THROUGH MIDNIGHT
MDT TONIGHT…

THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A

* FLASH FLOOD WATCH FOR A PORTION OF SOUTHWEST COLORADO, INCLUDING
THE FOLLOWING AREAS, ANIMAS RIVER BASIN, SAN JUAN RIVER BASIN AND
SOUTHWEST SAN JUAN MOUNTAINS.

* FROM NOON MDT TODAY THROUGH THIS EVENING

* SCATTERED TO NUMEROUS STORMS ARE EXPECTED AGAIN ACROSS MUCH OF
SOUTHWEST COLORADO THROUGH THIS EVENING. STORMS WILL BE CAPABLE OF
PRODUCING LOCALLY HEAVY RAINFALL WHICH, WHEN COMBINED WITH SLOW
STORM MOTION, WILL ENHANCE THE RISK OF LOCALIZED FLASH FLOODING.
RAINFALL AMOUNTS OF HALF AN INCH TO TWO INCHES IN A SHORT AMOUNT
OF TIME WILL EXACERBATE FLOODING CONCERNS IN THE WATCH AREA.

* FLASH FLOODING WILL BE POSSIBLE OVER THE BURN SCARS AND AREAS THAT
HAVE SEEN SATURATED SOILS DUE TO PREVIOUS HEAVY RAINS. THE GROUND
IN BURN SCAR AREAS IS UNSTABLE, SO DEBRIS FLOWS AND MUDSLIDES
COULD OCCUR IN AND AROUND THE BURN SCAR.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO
FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU
SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD
FLASH FLOOD WARNINGS BE ISSUED

Here are the latest model runs showing their precipitation accumulation predictions for the next 24 hours (ending 8 am Tuesday).

euro24

Canadian

gem-all-colorado-total_precip_inch-5948400

German

icon-all-colorado-total_precip_inch-5948400

GFS

gfs-deterministic-colorado-total_precip_inch-5944800

High-resolution NAM

Capture

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2 thoughts on “Flash Flood Watch

  1. Frank Masiarz

    Hi……….

    Had 0.325-inch of rain at north end of CR 228 at CR 502 last evening. Beautiful steady rain…awesome. Send more, please !!!

  2. Frank Masiarz

    Hi again……..

    Hail and rain north end of CR 228 at CR 502 !! Hail is pea-size and rain is heavy. Had momentary power outage and a temperature drop of 20 degrees…from 80 to 60 degrees in five minutes. Seems to be passing over now….rain stopping. Have images, but no way to attach them.

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