Alert archive / Arizona / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 17, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 30, 2000, 4:54 PM MST for Yavapai County, Arizona. It was in force for 36 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 30, 2000, 4:54 PM MST (23:54 UTC)
- Expired
- Jul 30, 2000, 5:30 PM MST
- In force
- 36 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), 49 km from the middle of the area, began a volume at 23:55 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, 11.9 hours before the alert went out and 87 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2655 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS55 KFGZ 302355 SVRFLG AZC025-310045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 454 PM MST SUN JUL 30 2000 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL YAVAPAI COUNTY IN ARIZONA * UNTIL 530 PM MST * AT 454 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME EAST CENTRAL YAVAPAI COUNTY...OR ABOUT 13 MILES SOUTHEAST OF CAMP VERDE...MOVING WEST AT 10 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 3439 11160 3457 11160 3456 11189 3435 11186
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 30, 2:30 PM MST, 2 hours 24 minutes earlier.
Area forecast discussion, Jul 30, 2:30 PM MST, 2 hours 24 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST SUN JUL 30 2000 SYNOPSIS...HIGH PRESSURE ALOFT HAS MOVED NORTHWARD OVER THE GREAT BASIN REGION AND WILL REMAIN THERE THROUGH THE MIDDLE OF THE WEEK. AS A RESULT...MOISTURE AND THE CHANCE FOR SHOWERS AND THUNDERSTORMS WILL STEADILY INCREASE FROM EAST TO WEST DURING THE NEXT SEVERAL DAYS. TEMPERATURES WILL BEGIN COOLING TODAY...AND WILL TREND TOWARD SEASONAL NORMALS BY THE FIRST PART OF THE WORK WEEK. DISCUSSION...WATER VAPOR IMAGERY SHOWS HIGH PRESSURE CELL LOCATED OVER SOUTHEASTERN CA WITH A STRONG VORT MAX CURRENTLY MOVING WSW ACROSS SOUTHERN NM. THIS VORT MAX HAS INTRODUCED SOME SUBSIDENCE AND DRIER AIR ACROSS PORTIONS OF THE EASTERN CWA WHICH IS CONTINUING TO KEEP CONVECTION DOWN TO A MINIMUM. LOCALLY ALONG THE RIM AND KAIBAB PLATEAU...A FEW THUNDERSTORMS HAVE DEVELOPED BUT ARENT LASTING LONG AS THEY INGEST DRIER AIR AND ARE QUICKLY ADVECTED AWAY FROM THE LOW-LEVEL CONVERGENCE SOURCE BY THE 20KT OF NORTHEAST FLOW ACROSS THE AREA. ONLY REAL AREAS OF CONCERN AT THIS POINT APPEAR TO BE IN THE FAR NORTH AND THE FAR NORTHEAST DUE TO MORE ACTIVE CONVECTION IN UT AND CO CURRENTLY MOVING TOWARD ARIZONA. THIS CONVECTION MAY BE DEVELOPING AHEAD OF ANOTHER VORT MAX CURRENTLY LOCATED OVER CO AND ALSO MOVING SOUTHWARD. EXPECT THIS ACTIVITY TO MOVE MAINLY INTO ZONES 4 AND 11 THIS EVENING WITH SOME ADJACENT ZONES SEEING SOME IMPACT AS WELL. WILL HAVE TO WATCH TO SEE HOW FAR SOUTH THIS CONVECTION LASTS TONIGHT AS THERE IS AN AREA OF INERTIAL INSTABILITY REMAINING OVER THE SOUTHERN HALF OF THE STATE FOR CONTINUED DEVELOPMENT IF STORMS MAKE IT THERE. FOR NOW WILL KEEP THINGS MAINLY DRY TONIGHT OVER OTHER SECTIONS OF THE CWA. EXPECT AN UPSWING TO ACTIVITY STARTING TOMORROW AS MORE VORT MAXIMA MOVE AROUND THE PERIFERY OF THE HIGH PRESSURE CELL AND ADDITIONAL MID-LEVEL MOISTURE IS ADVECTED IN FROM THE NORTHEAST AND EAST. ALSO...MID-LEVEL TRAJECTORY BECOMES MORE FAVORABLE FOR MOVEMENT OF AFTERNOON CONVECTION IN CO TO MOVE INTO NORTHERN AZ. EXTENDED FORECAST WILL CONTINUE THIS TREND FOR A CHANCE OF AFTERNOON/EVENING % SHOWERS AND THUNDERSTORMS AS HIGH PRESSURE REMAINS IN POSITION TO CONTINUE THE EASTERLIES UNTIL LATER IN THE WEEK. STAUDENMAIER .FGZ...NONE.
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.