Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 50, NWS Flagstaff, AZ

August 4, 2001Apache County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 4, 2001, 4:34 PM MST for Apache County, Arizona. It was in force for 26 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 4, 2001, 4:34 PM MST (23:34 UTC)
Expired
Aug 4, 2001, 5:00 PM MST
In force
26 min
Issued by
NWS Flagstaff, AZ
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Apache County, AZ

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 11.6 hours before the alert went out and 206 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Flgstf/Belemont, AZ at 12:00Z on 2001-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2001-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
8 J/kg
Mixed-layer CIN
-197 J/kg
Mixed-layer LCL
1658 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS55 KFGZ 042335
SVRFLG

AZC001-050000-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
434 PM MST SAT AUG 4 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL APACHE COUNTY IN ARIZONA
  THIS INCLUDES THE CITIES OF...CHAMBERS...SANDERS...WIDE RUINS

* UNTIL 500 PM MST

* AT 434 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES SOUTHWEST OF CHAMBERS...MOVING NORTHEAST AT 10
  MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO...  
  CHAMBERS AT 440 PM MST
  7 MILES SOUTH OF WIDE RUINS AT 500 PM MST

VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3514 10970 3501 10940 3537 10926 3548 10958

$$
JJ

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 4, 2:30 PM MST, 2 hours 4 minutes earlier.

Area forecast discussion, Aug 4, 2:30 PM MST, 2 hours 4 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST SAT AUG 04 2001

.SYNOPSIS...HIGH PRESSURE OVER THE CENTRAL PLAINS WILL BUILD
WESTWARD TOWARDS ARIZONA OVER THE NEXT FEW DAYS AND REMAIN IN PLACE
FOR MUCH OF THE UPCOMING WEEK. AS A RESULT...MONSOON MOISTURE WILL
REMAIN OVER THE STATE WITH A CHANCE OF SHOWERS AND THUNDERSTORMS
EACH DAY.

.DISCUSSION...LARGE COMPLEX OF OUTFLOW DOMINATED THUNDERSTORMS
DEVELOPED OVER THE WESTERN MOGOLLON RIM AND YAVAPAI COUNTY MOUNTAINS
THIS AFTERNOON WITH VERY HEAVY RAIN. THUNDERSTORM ACTIVITY ELSEWHERE
SLOW TO DEVELOP BUT STILL EXPECTING DEVELOPMENT OVER THE WHITES AND
EASTERN RIM LATER THIS AFTERNOON INTO THIS EVENING AS CIRCULATION
CENTER MOVES TOWARD STATE FROM WEST TEXAS. EXPECT A MORE ORGANIZED
COMPLEX TO DEVELOP OVER SOUTHEASTERN AZ WHICH MAY ALSO CONTRIBUTE TO
OVERNIGHT ACTIVITY OVER THE SOUTHERN ZONES. WILL USE EVENING WORDING
WHERE THUNDERSTORMS ARE CURRENTLY USING UP CONVECTIVE ENERGY AND
BROADBRUSH THROUGH THE NIGHT IN SOUTHERN ZONES WHERE ACTIVITY WILL
BE LATE TO START.

MODELS INDICATE SOME MINOR UPS AND DOWNS TO MOISTURE AND SOME
MODIFICATION TO STREAMLINE TRAJECTORIES AS RIDGE DEVELOPS NORTHWARD
SENDING EASTERLY AND NORTHEASTERLY FLOW INTO THE STATE. THIS WILL
KEEP MONSOON BOUNDARY WEST OF CWA. INTERESTING CIRCULATION CENTER
MOVING UP THE WEST COAST OF MEXICO TO INTERACT WITH TEXAS
CIRCULATION CENTER TOMORROW. WITH STRONG HEATING STILL IN DESERTS
POTENTIAL EXISTS FOR GULF SURGE IF A LARGE THUNDERSTORM COMPLEX CAN
DEVELOP OVER NORTHWEST MEXICO AND MOVE OVER GULF. DUE TO ALL
THESE UNCERTAINTIES WILL BROADBRUSH TYPICAL MONSOONAL WORDING
THROUGH THE FORECAST PERIOD. DEEPENING TROUGH OFF WEST COAST LATE IN
THE EXTENDED PERIOD DOESNT APPEAR STRONG ENOUGH TO DRY OUT WESTERN
CWA BUT WILL NEED TO BE MONITORED.  STAUDENMAIER

.FGZ...NONE.

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 4, 11:20 AM MSTSevere Thunderstorm WarningFGZCoconino25 min
Aug 4, 2:20 PM MSTFlash Flood WarningFGZCoconino70 min
Aug 4, 2:23 PM MSTSevere Thunderstorm WarningFGZYavapai37 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2001Every severe thunderstorm warning in 2001

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.