Alert archive / Arizona / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 26, NWS Flagstaff, AZ

August 1, 2000Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 1, 2000, 7:18 PM MST for Yavapai County, Arizona. It was in force for 27 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 1, 2000, 7:18 PM MST (02:18 UTC)
Expired: Aug 1, 2000, 7:45 PM MST
In force: 27 min
Issued by: NWS Flagstaff, AZ
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 84 km from the middle of the area, began a volume at 02:21 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 00:00Z, 2.3 hours before the alert went out and 48 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: 118 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 3438 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

432 
WUUS55 KFGZ 020218
SVRFLG
AZC025-020245-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
718 PM MST TUE AUG 1 2000

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS EXTENDED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL YAVAPAI COUNTY IN ARIZONA

* UNTIL 745 PM MST

* AT 718 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER EAST CENTRAL YAVAPAI COUNTY...OR ABOUT 7
  MILES NORTHWEST OF COTTONWOOD...MOVING WEST AT 15 MPH.

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 IN FLAGSTAFF.

LAT...LON 3488 11210 3477 11217 3478 11202 3486 11189
          3492 11205

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 1, 2:30 PM MST, 4 hours 48 minutes earlier.

Area forecast discussion, Aug 1, 2:30 PM MST, 4 hours 48 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
230 PM MST TUE AUG 1 2000

SYNOPSIS...HIGH PRESSURE OVER THE GREAT BASIN WILL CONTINUE TO BRING
AN EASTERLY FLOW TO NORTHERN ARIZONA FOR THE NEXT FEW DAYS. THE CHANCE
OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS OVER MOST OF THE
RIM COUNTRY WILL CONTINUE THROUGH THE END OF THE WEEK. OTHER AREAS
WILL STAY MOSTLY SUNNY AND DRY.

DISCUSSION...UNLIKE YESTERDAY...BIGGEST ACTION TODAY OVER THE
COCONINO PLATEAU AND CHUSKAS WITH STORMS DEVELOPING AND MOVING
QUICKLY WESTWARD WITH THE UPPER FLOW. EASTERN RIM AND NORTHERN GILA
COUNTY RELATIVELY QUIET SO FAR...WITH A CLUSTER OF THUNDERSTORMS
MOVING WESTWARD FROM NEW MEXICO INTO THE EASTERN LCR. EASTERLY FLOW LOOKS
TO CONTINUE FOR THE NEXT FEW DAYS. WITH LIMITED UPSTREAM MOISTURE
SEE A CONTINUATION OF THE CURRENT TREND OF CONVECTION FIRING OFF
DURING THE AFTERNOON OVER THE HIGHER TERRAIN AND THEN MOVING
WESTWARD OVER THE LOWER LYING AREAS. BECAUSE OF THIS...AREAS WELL
WEST OF HIGHER TERRAIN...SUCH AS THE LCR...LIKELY WONT SEE MUCH
ACTIVITY UNTIL THE LATER AFTERNOON TO EARLY EVENING.

IN THE EXTENDED...FRIDAY THROUGH SUNDAY...THE HIGH PRESSURE RIDGE
PERSISTS OVER THE SOUTHWEST. ALTHOUGH RELATIVELY DRY...THE RH ACROSS THE
RIM COUNTRY OF NRN AZ LOOKS TO STAY JUST HIGH ENOUGH TO WARRANT A
CHANCE OF STORMS DURING THE EXTENDED. NORTH AND EAST OF THE RIM WILL
BE MOSTLY SUNNY TO PARTLY CLOUDY.

KREITNER

.FGZ...NONE.

In the hours before

Local storm report, Aug 1, 2:02 PM MST, 5 hours 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FLAGSTAFF ARIZONA
202 PM MST TUE AUG 1 2000

TIME (MST) .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

630 PM     Forest Lakes              AZ   1.0 INCH HAIL
07/31/00   Coconino

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 6:16 PM MST	Severe Thunderstorm Warning	FGZ	Gila	29 min
Aug 1, 6:45 PM MST	Severe Thunderstorm Warning	FGZ	Gila	30 min
Aug 1, 6:50 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	25 min
Aug 1, 7:50 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	40 min
Aug 1, 8:25 PM MST	Severe Thunderstorm Warning	FGZ	Yavapai	25 min
Aug 1, 8:40 PM MST	Tornado Warning	FGZ	Yavapai	35 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2000 Every 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.