Alert archive / Arizona / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 9, NWS Flagstaff, AZ

July 22, 2000Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 22, 2000, 3:17 PM MST for Gila County, Arizona. It was in force for 28 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
Jul 22, 2000, 3:17 PM MST (22:17 UTC)
Expired
Jul 22, 2000, 3:45 PM MST
In force
28 min
Issued by
NWS Flagstaff, AZ
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Gila County, AZ

The radar

The Flagstaff radar (KFSX), 35 km from the middle of the area, began a volume at 22:18 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Phoenix, AZ (KPSR), launched 12:00Z, 10.3 hours before the alert went out and 111 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, Phoenix, AZ at 12:00Z on 2000-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 763 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, Phoenix, AZ at 12:00Z on 2000-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
763 J/kg
Mixed-layer CIN
-311 J/kg
Mixed-layer LCL
2260 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
43 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.

093 
WUUS55 KFGZ 222217
SVRFLG
AZC007-222245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
317 PM MST SAT JUL 22 2000

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN GILA COUNTY IN ARIZONA
  THIS INCLUDES THE CITY OF PAYSON

* UNTIL 345 PM MST

* AT 316 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  SEVERE THUNDERSTORM ABOUT 3 MILES EAST OF PAYSON...MOVING          
  SOUTHWEST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PAYSON AT 330 PM MST

THIS STORM CONTAINS STRONG GUSTY WINDS IN EXCESS OF 55 MPH AND LARGE 
HAIL. REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY 
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST 
OFFICE IN FLAGSTAFF.

LAT...LON 3428 11144 3419 11134 3424 11118 3440 11129

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 Jul 22, 2:30 PM MST, 47 minutes earlier.

Area forecast discussion, Jul 22, 2:30 PM MST, 47 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST SAT JUL 22 2000

SYNOPSIS...A STRONG RIDGE OF HIGH PRESSURE IS EXPECTED TO REMAIN
CENTERED OVER THE FOUR CORNERS AREA THROUGH SUNDAY AND THEN MOVE
SOUTHWARD INTO SOUTHERN NEW MEXICO ON MONDAY. MID LEVEL MOISTURE
WILL REMAIN OVER NORTHERN ARIZONA THROUGH SUNDAY AND THEN IS EXPECTED
TO BE SWEPT EASTWARD ON MONDAY AS SOUTHWEST FLOW ALOFT RETURNS TO
THE STATE.

DISCUSSION...A BUSY AFTERNOON SO WILL KEEP IT SHORT. THE NGM AND ETA
ARE IN GOOD AGREEMENT THROUGH 18Z SUNDAY AS THEY SHOW MID LEVEL
MOISTURE BEING CIRCULATED AROUND THE ANTICYCLONE CENTERED OVER THE 4
CORNERS. AT 18Z SUNDAY THOUGH THE NGM DEVELOPS A 70% RH POOL AT H7
CENTERED OVER NEEDLES. THE DPROG/DT OF THIS PANEL DOES NOT SHOW GOOD
RUN TO RUN CONSISTENCY. SECOND...THE OVERALL PATTERN ACROSS THE WEST
LOOKS TO BE DEAMPLIFYING WITH TIME...ALLOWING THE RIDGE AXIS
ORIENTATION TO CHANGE FROM ITS CURRENT NORTH TO SOUTH POSITION TO
MORE EAST TO WEST. ALSO THE ANTICYCLONE CIRCULATION CENTER LOOKS TO
BE SHIFTING SOUTHWARD SUNDAY NIGHT INTO MONDAY...WITH A RETURN OF
DRY WEST SOUTHWEST FLOW TO CWA FROM MONDAY THROUGH AT LEAST
THURSDAY. THE ETA HAS BEEN CONSISTENT WITH THE DRYING FROM WEST TO
EAST...THUS WILL GO WITH THIS TREND.

THE EXTENDED PROGS CONTINUE TO SHOW THE HIGH CENTER TO OUR SOUTH AND
EAST...POINTING TO A WEST TO SOUTHWEST FLOW ALOFT. THUS WILL KEEP IT
DRY IN THE EXTENDED.

JDL
.FGZ...NONE.

In the hours before

Special weather statement, Jul 22, 9:30 AM MST, 5 hours 47 minutes before
AZZ004>018-037>040-222030-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
930 AM MST SAT JUL 22 2000

...SCATTERED THUNDERSTORMS ALONG AND SOUTH OF THE MOGOLLON RIM
TODAY...ISOLATED THUNDERSTORMS ACROSS THE COCONINO PLATEAU AND
LITTLE COLORADO RIVER VALLEY...

SPOTTER REPORTS OF HEAVY RAIN AND STRONG WINDS REQUESTED.

MID LEVEL MONSOON MOISTURE HAS SPREAD NORTHWARD OVERNIGHT...NOW
COVERING AREAS WEST AND SOUTH OF A LINE FROM PAGE TO WINSLOW TO
GALLUP...NEW MEXICO. LOW LEVEL MOISTURE REMAINS OVER THE LOWER
DESERT AREAS SOUTH AND WEST OF THE MOGOLLON RIM. SCATTERED
THUNDERSTORMS ARE EXPECTED TO DEVELOP AFTER 1PM MST OVER THE HIGHER
TERRAIN OF NORTH CENTRAL ARIZONA...AND LATER IN THE AFTERNOON OVER
THE LOWER DESERT AND VALLEYS. THE MAIN THREATS TODAY FROM THE
THUNDERSTORMS WILL BE LIGHTNING AND STRONG...ERRATIC WINDS IN THE
VICINITY OF THE THUNDERSTORMS. LOCALLY HEAVY RAINS ARE AGAIN
POSSIBLE IN SOUTHERN YAVAPAI COUNTY LATE IN THE DAY.

JDL

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 7:37 PM MSTSevere Thunderstorm WarningFGZYavapai23 min
Jul 22, 4:29 PM MSTSevere Thunderstorm WarningFGZYavapai46 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2000Every severe thunderstorm warning in 2000

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; radar from the NEXRAD Level II archive.