Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 23, NWS Flagstaff, AZ

July 5, 2001Gila County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 5, 2001, 3:08 PM MST for Gila County, Arizona. It was in force for 52 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 5, 2001, 3:08 PM MST (22:08 UTC)
Expired: Jul 5, 2001, 4:00 PM MST
In force: 52 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), 58 km from the middle of the area, began a volume at 22:07 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, 10.1 hours before the alert went out and 126 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: 360 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 2024 m above ground
0-6 km bulk shear: 0 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 0 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 052212 CCA
SVRFLG

AZC007-052300-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ...CORRECTED FOR HEADER...
308 PM MST THU JUL 5 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL GILA COUNTY IN ARIZONA

* UNTIL 400 PM MST

* AT 308 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A LINE OF SEVERE THUNDERSTORMS 8 MILES EAST OF YOUNG...OR ABOUT 14
  MILES SOUTH OF FOREST LAKES. THESE STORMS WERE SLOWLY MOVING
  SOUTHWEST AT 5 MPH.

* THE SEVERE THUNDERSTORM WILL PASS 6 MILES EAST OF YOUNG AT 345 PM
  MST

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

LAT...LON 3428 11094 3419 11111 3398 11089 3394 11075
          3405 11073

MAS

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 5, 2:30 PM MST, 38 minutes earlier.

Area forecast discussion, Jul 5, 2:30 PM MST, 38 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST THU JUL 05 2001

SYNOPSIS...HIGH PRESSURE ALOFT WILL SHIFT EASTWARD OVER THE NEXT FEW
DAYS. AS A RESULT...A MOIST SOUTHERLY FLOW WILL DEVELOP OVER ARIZONA.
LOOK FOR DAILY SHOWERS AND THUNDERSTORMS OVER NORTHERN ARIZONA TO
CONTINUE INTO NEXT WEEK.

DISCUSSION...UPPER RIDGE CENTERED OVER COLORADO THIS AFTERNOON. MODELS
IN GENERAL AGREEMENT IN MOVING THIS FEATURE EASTWARD OVER THE NEXT
TWO DAYS. FOR TONIGHT MID TO UPPER FLOW WILL REMAIN SOUTHEASTERLY WITH
THE MAIN THUNDERSTORM ACTIVITY OVER THE WESTERN THIRD OF THE COUNTY
WARNING AREA (CWA) WHERE THE HIGHEST MOISTURE VALUES ARE LOCATED. THIS
INCLUDES THE WESTERN MOGOLLON RIM...YAVAPAI COUNTY...THE COCONINO
PLATEAU...GRAND CANYON COUNTRY AND THE KAIBAB PLATEAU. EXPECT AT
LEAST ISOLATED STORM ACTIVITY TO CONTINUE OVERNIGHT IN THIS AREA. THE
REMAINDER OF THE CWA WILL SEE JUST ISOLATED EVENING THUNDERSTORMS AS
DRIER AIR CONTINUES TO FEED IN FROM NEW MEXICO. ON FRIDAY AND
SATURDAY A WEAK TROUGH (CURRENTLY ALONG THE BAJA CALIFORNIA COAST)
WILL MOVE NORTHWARD ACROSS WESTERN ARIZONA AND SOUTHERN CALIFORNIA.
THE NET RESULT WILL BE A DEEPENING AND STRENGTHENING SOUTHERLY FLOW.
PRECIPITABLE WATER VALUES IN SOUTHERN ARIZONA ARE IN THE 1.50 TO
2.00 INCH RANGE TODAY AND  THIS MOISTURE WILL BE ADVECTED ACROSS
NORTHERN ARIZONA ON FRIDAY AND SATURDAY. AS A RESULT...COULD SEE THE
MOST SIGNIFICANT THREAT OF FLASH FLOOD PRODUCING THUNDERSTORMS THIS
SEASON. OTHERWISE...WITH MORE MOISTURE AND CLOUDS DAYTIME
TEMPERATURES WILL GRADUALLY LOWER WITH GENERALLY LIGHT WINDS.

IN THE EXTENDED...UPPER RIDGE REMAINS NEAR THE FOUR CORNERS AREA
WITH MOISTURE CONTINUING TO MOVE INTO NORTHERN ARIZONA FROM THE
SOUTH. AS A RESULT...A CHANCE OF SHOWERS AND THUNDERSTORMS ARE
EXPECTED EACH DAY.

MCCOLLUM

.FGZ...NONE.

In the hours before

Special weather statement, Jul 5, 9:28 AM MST, 5 hours 40 minutes before

AZZ004>018-037>040-051930-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
930 PM MST THU JUL 05 2001

...ISOLATED SEVERE THUNDERSTORMS OVER WESTERN YAVAPAI AND COCONINO
COUNTIES LATER THIS AFTERNOON AND INTO THE EVENING...

DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO FORM THIS
AFTERNOON...MAINLY OVER THE KAIBAB PLATEAU...GRAND CANYON COUNTRY
AND WESTERN MOGOLLON RIM. SOUTHEAST FLOW ALOFT WILL PUSH THESE STORMS
INTO THE LOWER TERRAIN OF WESTERN YAVAPAI AND COCONINO COUNTIES BY
MID AFTERNOON. AS THE STORMS MOVE INTO DEEPER MOISTURE A FEW WILL
BECOME SEVERE WITH THE MAIN THREAT BEING WIND GUSTS OF 50 TO 60 MPH.
STORMS WILL ALSO BE CAPABLE OF PRODUCING DOWNPOURS OF 1 TO 2 INCHES BUT
WIDESPREAD HEAVY RAINFALL IS NOT ANTICIPATED. STORMS SHOULD
CONTINUE INTO THE EVENING HOURS BEFORE DIMINISHING.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:34 PM MST	Severe Thunderstorm Warning	FGZ	Coconino	41 min
Jul 4, 9:18 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	27 min
Jul 5, 11:50 AM MST	Severe Thunderstorm Warning	FGZ	Coconino	35 min
Jul 5, 12:52 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	43 min
Jul 5, 1:34 PM MST	Severe Thunderstorm Warning	FGZ	Coconino, Yavapai	41 min
Jul 5, 1:58 PM MST	Flash Flood Warning	FGZ	Yavapai	2 hr
Jul 5, 2:13 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	47 min
Jul 5, 4:06 PM MST	Severe Thunderstorm Warning	FGZ	Gila	39 min
Jul 5, 4:32 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	43 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.