Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 32, NWS Flagstaff, AZ

July 9, 2001Apache County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 9, 2001, 1:40 PM MST for Apache County, Arizona. It was in force for 30 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 9, 2001, 1:40 PM MST (20:40 UTC)
Expired: Jul 9, 2001, 2:10 PM MST
In force: 30 min
Issued by: NWS Flagstaff, AZ
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Apache County, AZ

The radar

The Flagstaff radar (KFSX), 123 km from the middle of the area, began a volume at 20:42 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

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.7 hours before the alert went out and 199 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1450 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 110 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 092041
SVRFLG

AZC001-017-092110-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
140 PM MST MON JUL 9 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN APACHE COUNTY IN ARIZONA
  EXTREME SOUTHEASTERN NAVAJO COUNTY IN ARIZONA

* UNTIL 210 PM MST

* AT 140 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EXTREME SOUTHWESTERN APACHE COUNTY...OR
  ABOUT 15 MILES NORTHEAST OF SHOW LOW...MOVING NORTHWEST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO...
SILVER CREEK AND WHITE MOUNTAIN LAKE AT 150 PM MST.

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 NATIONxAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3427 10985 3440 10970 3456 10991 3441 11007

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 9, 9:15 AM MST, 4 hours 25 minutes earlier.

Area forecast discussion, Jul 9, 9:15 AM MST, 4 hours 25 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
915 AM MST MON JUL 09 2001

SYNOPSIS...SOUTHERLY FLOW WILL CONTINUE TO SPREAD MOISTURE ACROSS
NORTHERN ARIZONA. EXPECT THE PATTERN OF MAINLY AFTERNOON SHOWERS AND
THUNDERSTORMS TO CONTINUE OVER MUCH OF THE AREA INTO MIDWEEK. BY
LATE IN THE WEEK AND THE WEEKEND A DRIER SOUTHWESTERLY FLOW WILL
DEVELOP WITH THUNDERSTORM ACTIVITY CONFINED MAINLY TO THE EASTERN
PORTION OF THE STATE.

DISCUSSION...MOIST SOUTHERLY FLOW CONTINUES TO STREAM ACROSS THE
FORECAST AREA TODAY WITH AZ BETWEEN A WEAK UPPER TROF IN THE EASTERN
PACIFIC AND AN UPPER LEVEL RIDGE TO OUR EAST. 12Z FGZ RAOB SHOWS
PLENTY OF MOISTURE AVAILABILITY THROUGHOUT THE COLUMN...SO EXPECT
TODAY TO BE VERY SIMILAR TO YESTERDAY WITH MAIN THREAT BEING
LOCALIZED HEAVY RAINFALL FROM SCATTERED TSTORMS. FEATURE OF
INTEREST FOR THE SHORT TERM IS THE INVERTED TROF LOCATED OVER THE
BIG BEVND AREA.  AVN MOVES THIS SYSTEM NEAR THE SOUTHERN AZ BORDER
LATE TOMORROW EVENING AND INTO CENTRAL AZ ON WEDNESDAY.
THUS...EXPECT AN UPSWING IN ACTIVITY BY MIDWEEK.  TW

.FGZ...NONE.

In the hours before

Special weather statement, Jul 9, 9:10 AM MST, 4 hours 30 minutes before

AZZ004>018-037>040-091930-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
910 AM MST MON JUL 09 2001

...SCATTERED THUNDERSTORMS ACROSS NORTHERN ARIZONA TODAY...

SOUTHERLY FLOW AND A DEEP PLUME OF MONSOON MOISTURE WILL REMAIN
ACROSS NORTHERN ARIZONA TODAY. AS A RESULT...SCATTERED SHOWERS AND
THUNDERSTORMS WILL BEGIN TO DEVELOP AROUND NOON WITH DAYTIME
HEATING. THE STRONGEST THUNDERSTORMS IN NORTHERN ARIZONA WILL
DEVELOP ACROSS THE EASTERN AND CENTRAL MOUNTAINS. DUE TO THE
ABUNDANT MOISTURE...SOME OF THESE STORMS WILL BE CAPABLE OF
PRODUCING HEAVY DOWNPOURS...ALONG WITH SMALL HAIL. EXPECT STREAMS
AND WASHES IN THE VICINITY OF THESE STORMS THAT ARE NORMALLY DRY TO
FLOW WITH WATER.

SPOTTER REPORTS OF EXCESSIVE RAINFALL AMOUNTS AND SEVERE WEATHER
SHOULD BE RELAYED TO THE NATIONAL WEATHER SERVICE.

Special weather statement, Jul 9, 9:30 AM MST, 4 hours 10 minutes before

AZZ004>018-037>040-091930-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
930 AM MST MON JUL 09 2001

...SCATTERED THUNDERSTORMS...SOME WITH HEAVY DOWNPOURS...ACROSS
NORTHERN ARIZONA TODAY...

SOUTHERLY FLOW AND A DEEP PLUME OF MONSOON MOISTURE WILL
REMAIN ACROSS NORTHERN ARIZONA TODAY. AS A
RESULT...SCATTERED SHOWERS AND THUNDERSTORMS WILL BEGIN TO
DEVELOP AROUND NOON WITH DAYTIME HEATING. THE STRONGEST
THUNDERSTORMS IN NORTHERN ARIZONA WILL DEVELOP ACROSS THE
EASTERN AND CENTRAL MOUNTAINS. DUE TO THE ABUNDANT
MOISTURE...SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCING
HEAVY DOWNPOURS...ALONG WITH SMALL HAIL. EXPECT STREAMS AND
WASHES IN THE VICINITY OF THESE STORMS THAT ARE NORMALLY DRY
TO FLOW WITH WATER.

SPOTTER REPORTS OF EXCESSIVE RAINFALL AMOUNTS AND SEVERE WEATHER
SHOULD BE RELAYED TO THE NATIONAL WEATHER SERVICE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 1:40 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	30 min
Jul 9, 4:12 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	33 min
Jul 9, 4:12 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	33 min
Jul 9, 4:45 PM MST	Severe Thunderstorm Warning	FGZ	Navajo	30 min
Jul 9, 4:45 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	30 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2001 Every 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; radar from the NEXRAD Level II archive.