Dense Fog in Colorado, September 30, 2005

Name: Dense Fog in Colorado, September 30, 2005
Start: 2005-09-30T01:50
End: 2005-09-30T07:00
Location: Colorado

September 30, 2005 · NWS GJT · 1 event in 1 county or zone

Fog reduced visibility to 1/4 mile or less in many areas as reported by law enforcement and measured by automated sensors.

Where it happened

Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS GJT wrote it up.

Fog reduced visibility to 1/4 mile or less in many areas as reported by law enforcement and measured by automated sensors.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Junction, CO wrote its last area forecast discussion before the first event at Sep 29, 1:45 PM MST, 12 hours 5 minutes earlier.

Area forecast discussion, Sep 29, 1:45 PM MST, 12 hours 5 minutes before

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Hazardous weather outlook, Sep 29, 5:00 AM MST, 20 hours 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
600 AM MDT THU SEP 29 2005

COZ001>014-UTZ022>025-027>029-301200-
ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES-
CENTRAL COLORADO RIVER BASIN-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR-
EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS-
ELKHEAD AND PARK MOUNTAINS-FLAT TOPS-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS-
GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN-
ROAN AND TAVAPUTS PLATEAUS-SOUTHEAST UTAH-TAVAPUTS PLATEAU-
UPPER GUNNISON RIVER VALLEY-UPPER YAMPA RIVER BASIN-
WEST ELK AND SAWATCH MOUNTAINS-
600 AM MDT THU SEP 29 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND NORTHWESTERN
COLORADO.

.DAY ONE...TODAY AND TONIGHT...

ISOLATED THUNDERSTORMS WILL OCCUR OVER THE MOUNTAINS THIS
AFTERNOON.  THUNDERSTORMS WILL END EARLY IN THE EVENING.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

FOR MONDAY AND TUESDAY...THERE WILL BE A CHANCE OF SHOWERS AND
THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.

COZ017>023-301200-
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-
UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-
600 AM MDT THU SEP 29 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHWESTERN COLORADO.

.DAY ONE...TODAY AND TONIGHT...

STRONG...POSSIBLY SEVERE...THUNDERSTORMS WILL OCCUR TODAY.
THUNDERSTORMS WILL BE CAPABLE OF PRODUCING HAIL...HEAVY RAIN
SHOWERS AND FREQUENT CLOUD TO GROUND LIGHTNING.  IN ADDITION...
URBAN AND SMALL STREAM FLOODING WILL BE POSSIBLE WITH THE HEAVIEST
RAIN SHOWERS.

THUNDERSTORMS WILL END QUICKLY THIS EVENING WITH DRY CONDITIONS
EXPECTED BY MIDNIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

FOR MONDAY AND TUESDAY...THERE WILL BE A CHANCE OF SHOWERS AND
THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT SEVERE WEATHER...RAINFALL...OR
REPORTS OF FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN GRAND
JUNCTION.

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 dense fog. Local standard time, as filed.

Dense Fog, Animas River Basin

When: September 30, 1:50 AM MST to 7:00 AM MST
Where: Animas River Basin forecast zone
Reported by: AWOS,ASOS,MESONET,ETC
Coordinates: 37.287, -107.843 (the zone’s center; the record gives no point)

What these are

Dense Fog: Fog reducing visibility to a quarter mile or less, filed where it caused accidents or disruption.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Colorado in 2005 Every state in 2005 This day in weather history Warnings in Colorado, September 2005

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-10-01. Each event’s entry at NCEI: 5474321.