1 funnel cloud, as filed by the National Weather Service.
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.
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 Las Vegas, NV wrote its last area forecast discussion before the first event at Apr 21, 8:10 AM PST, 3 hours 57 minutes earlier.
MOJAVE DESERT/SOUTHERN GREAT BASIN AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE LAS VEGAS NV 910 AM PDT SAT APR 21 2001 SYNOPSIS...A STRONG LOW PRESSURE SYSTEM WHICH PRODUCED RAIN AND SNOW ACROSS MUCH OF NEVADA AND SOUTHEAST CALIFORNIA OVERNIGHT WILL BEGIN TO EXIT THE REGION LATE TODAY. HOWEVER...MOST AREAS WILL REMAIN AT RISK FOR PRECIPITATION TODAY...WITH THE GREATEST RISK OF HEAVIER PRECIPITATION OVER EAST-CENTRAL NEVADA AND NORTHWEST ARIZONA. RAIN AND SNOW WILL END TONIGHT AS THE STORM SYSTEM EXITS TO THE EAST. HIGH PRESSURE WILL THEN BUILD OVER THE REGION ON SUNDAY BRINGING DRY AND WARMER CONDITIONS. DISCUSSION...UPPER LOW CONTINUES TO AFFECT THE REGION THIS MORNING. PRECIPITATION OVER THE NORTHERN CWA IS BEGINNING TO SUBSIDE...IF NOT END AS OF PRESS TIME...BUT SHOWERS WILL REMAIN A POSSIBILITY OFF AND ON TODAY...WITH A GENERAL MODERATING TREND IN WEATHER CONDITIONS DURING THE AFTERNOON HOURS. THE HEAVIER PRECIPITATION IS OCCURRING OVER LINCOLN COUNTY IN FAVORABLE DIFFLUENT AREA ALOFT AND OVER NORTHWEST ARIZONA WHERE THE MAIN BAND OF SHOWERS IS LOCATED. BASED ON CURRENT OBSERVATIONS AND LATEST MODEL DATA...THESE AREAS WILL REMAIN FAVORED THROUGH THE EARLY EVENING HOURS FOR SIGNIFICANT PRECIPITATION. THUS...I WILL LEAVE THE CURRENT HIGHLIGHTS FOR THESE AREAS IN PLACE IN THE ZONE FORECAST. THE WINTER STORM WARNING FOR NORTHERN/CENTRAL NYE AND ESMERALDA COUNTIES REMAINS IN EFFECT THROUGH NOON...AND THIS SHOULD WORKOUT FINE AS PRECIPITATION IS ALREADY DECREASING AND SHOULD DROP-OFF SIGNIFICANTLY DURING THE AFTERNOON HOURS. WE WILL OPT TO CANCEL THE WINTER STORM WARNING FOR THE SPRING MOUNTAINS/SHEEP RANGE FOR TODAY. THE HIGHER ELEVATIONS IN THESE ZONES RECEIVED 6-12 INCHES OVERNIGHT ...BUT THE PROGGED MOISTURE...UPWARD FORCING AND FLOW PATTERN FOR THIS REGION DOES NOT JUSTIFY A WINTER STORM WARNING. HOWEVER...I WILL KEEP APPRECIABLE ACCUMULATIONS IN THE ZONE FORECAST. OVER THE LOWER DESERTS...THE COLD CORE ALOFT SWINGS THROUGH DURING THE DAY TODAY...AND THIS MAY BE ENOUGH TO STIMULATE AND SUPPORT THE DEVELOPMENT OF ISOLATED THUNDERSTORMS IN ADDITION TO ANY SHOWERS THAT MAY DEVELOP. SOUTHERN PORTIONS OF THE CWA MAY SEE SOME WRAP-AROUND MOISTURE DURING THE EVENING HOURS...AND THEN CONDITIONS WILL IMPROVE RAPIDLY. BENIGN WEATHER CONDITIONS ARE ON TAP BEYOND TONIGHT AS RIDGING ALOFT PREVAILS OVER THE REGION. UPDATES WILL BE OUT SHORTLY. .LAS...WINTER STORM WARNINGS AND SNOW ADVISORIES REMAIN IN EFFECT. PLEASE REFER TO THE LATEST WINTER WEATHER MESSAGE (RNOWSWLAS) FOR DETAILS.
The national radar mosaic for the moment the first event began.
1 funnel cloud. Local standard time, as filed.
Funnel cloud was sighted by a patrol officer behind the 911 operations center.
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, April 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: 5241072.