1 dense fog, as filed by the National Weather Service.
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.
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 Phoenix, AZ wrote its last area forecast discussion before the first event at Jan 12, 4:21 AM MST, 1 hour 39 minutes earlier.
AZZ020>028-CAZ030>033-121745- SOUTHWEST ARIZONA/SOUTHEAST CALIFORNIA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PHOENIX AZ 350 AM MST FRI JAN 12 2001 .SYNOPSIS... A WINTER STORM SYSTEM...WITH VALLEY RAIN AND MOUNTAIN SNOW...WILL MOVE EAST ACROSS THE SOUTHWESTERN UNITED STATES TODAY. PARTIAL CLEARING WILL LEAD TO PATCHY FOG LATE TONIGHT THROUGH MID MORNING SATURDAY. COLD WEATHER WILL CONTINUE...WITH A MIXTURE OF CLOUDS AND SUNSHINE THIS WEEKEND. A LOW PRESSURE SYSTEM FROM THE NORTH WILL BRING THE POSSIBILITY OF SHOWERS AGAIN EARLY NEXT WEEK. .DISCUSSION... A LOW PRESSURE SYSTEM WAS MOVING SLOWLY SOUTH NEAR THE CENTRAL CALIFORNIA COAST THIS MORNING. THE ASSOCIATED COLD FRONT WAS MOVING EAST SLOWER THAN EXPECTED FROM WESTERN INTO CENTRAL ARIZONA. SHOWERS WERE GENERALLY ON THE LIGHT SIDE...BUT SOME MODERATE TO LOCALLY HEAVY SHOWERS WERE DEVELOPING. HAVE CANCELED THE FLASH FLOOD WATCH SINCE IT LOOKS AS IF THE RAINFALL WILL ONLY BE LOCALLY HEAVY...AND AN URBAN AND SMALL STREAM FLOOD ADVISORY CAN BE ISSUED IF NECESSARY. THE SNOW ADVISORY FOR ZONE 24 SOUTHERN GILA COUNTY/TONTO NATIONAL FOREST FOOTHILLS CONTINUES FOR TODAY. THE VISIBILITY WAS DOWN TO 1 3/4 MILES AT IMPERIAL AIRPORT EARLY THIS MORNING...AND HAVE MENTIONED PATCHY FOG THROUGH MID MORNING THIS MORNING IN FAR SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA. SHOWERS ARE EXPECTED TO REDEVELOP AS THE LOW PRESSURE SYSTEM TRACKS EASTWARD ACROSS SOUTHERN CALIFORNIA TODAY AND INTO SOUTHWEST ARIZONA LATE THIS AFTERNOON. WITH THE LOW PRESSURE SYSTEM EXPECTED TO CONTINUE MOVING EAST... EXPECT PARTIAL CLEARING AND PATCHY FOG LATE TONIGHT THROUGH MID MORNING SATURDAY. ALSO...PARTLY CLOUDY SKIES IN SOUTH-CENTRAL ARIZONA AND MOSTLY SUNNY SKIES IN SOUTHWEST ARIZONA AND SOUTHEAST CALIFORNIA SATURDAY. HAVE INDICATED MORE SUNSHINE FOR SUNDAY AS ONLY A MINOR LOW PRESSURE SYSTEM SLIDES BY TO THE NORTH...BUT IT DOES KEEP THE AIRMASS ON THE COOL SIDE. A LOW PRESSURE SYSTEM FROM THE NORTH BRINGS THE POSSIBILITY OF SHOWERS AGAIN MONDAY AND TUESDAY. ELLIS
1 dense fog. Local standard time, as filed.
Dense fog reduced the visibility to less than a quarter mile, and briefly to near zero. Yuma International Airport was shut down for a time due to the fog.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2001Every state in 2001This day in weather historyWarnings in Arizona, January 2001
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 2026-09-24. Each event’s entry at NCEI: 5227957.