Alert archive / Arizona / Severe Thunderstorm Warnings in 2000
Severe Thunderstorm Warning 8, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 21, 2000, 7:37 PM MST for Yavapai County, Arizona. It was in force for 23 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 21, 2000, 7:37 PM MST (02:37 UTC)
- Expired
- Jul 21, 2000, 8:00 PM MST
- In force
- 23 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), 62 km from the middle of the area, began a volume at 02:39 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 00:00Z, 2.6 hours before the alert went out and 86 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
- 676 J/kg
- Mixed-layer CIN
- -223 J/kg
- Mixed-layer LCL
- 2929 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
509 WUUS55 KFGZ 220245 COR SVRFLG AZC025-220300- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 737 PM MST FRI JUL 21 2000 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EXTREME SOUTHEASTERN YAVAPAI COUNTY IN ARIZONA * UNTIL 800 PM MST * AT 737 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER EXTREME SOUTHEASTERN YAVAPAI COUNTY...OR ABOUT 25 MILES SOUTHWEST OF PAYSON...MOVING SOUTHWEST AT 5 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... 5 MILES EAST OF HORSESHOE RESERVOIR AROUND 745 PM MST 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 3411 11184 3398 11169 3422 11136 3438 11155
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 21, 2:30 PM MST, 5 hours 7 minutes earlier.
Area forecast discussion, Jul 21, 2:30 PM MST, 5 hours 7 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST FRI JUL 21 2000 SYNOPSIS...A STRONG HIGH PRESSURE CELL WILL REMAIN CENTERED OVER ARIZONA THIS WEEKEND. THE CLOCKWISE CIRCULATION AROUND THE HIGH WILL CONTINUE TO BRING IN MAINLY MID LEVEL MOISTURE TO THE WESTERN HALF OF ARIZONA ON SATURDAY. THIS MID LEVEL MOISTURE IS EXPECTED TO SPREAD EASTWARD INTO THE NAVAJO NATION SATURDAY NIGHT AND SUNDAY. THE MID LEVEL MOISTURE WILL ALLOW A SLIGHT CHANCE OF HIGH BASED THUNDERSTORMS BOTH SATURDAY AND SUNDAY AFTERNOON. ON MONDAY... A DRY SOUTHWEST FLOW ALOFT IS EXPECTED TO RETURN TO THE STATE...LASTING THROUGH MID WEEK. DISCUSSION...ON THE LARGE SCALE... THE WARM WARM HIGH PRESSURE SYSTEM EXPECTED TO SIT OVER ARIZONA THIS WEEKEND. THE FORECASTS WERE BASED ON THE ETA...ALTHOUGH NGM SIMILAR WITH LARGE SCALE FEATURES. WHAT WE HAVE NOW IS AN EAST TO WEST H5 RIDGE AXIS STRETCHING FROM NEW MEXICO INTO SOUTHEASTERN CAL. THE GULF SURGE INTO THE COLORADO RIVER VALLEY ALSO CONTINUES THIS AFTERNOON...WITH THE REMNANTS OF AN EASTERLY WAVE HEADED TOWARD PALM SPRINGS. A LINE OF CONVECTION HAS DEVELOPED ALONG THE MOGOLLON RIM THIS AFTERNOON AND WILL LIKELY SWEEP SOUTHWARD LATER TODAY. POPS TONIGHT WILL BE ADJUSTED ACCORDINGLY. ON SATURDAY...MID LEVEL MOISTURE (H5 TO H3) ON THE WESTERN PORTION OF THE RIDGE AXIS EXPECTED TO MOVE NORTHWARD TOWARDS UTAH. THIS DUE THE RIDGE AXIS BECOMING ALIGNED MORE NORTH TO SOUTH...AND MID LEVEL WINDS BECOMING SOUTHERLY. AREAL EXTENT OF THE LOW LEVEL MOISTURE STILL A WILD CARD. WE DO FEEL THAT THE FAR WESTERN PORTIONS OF THE CWA HAVE SHOT AT SOME LIQUID HITTING THE GROUND SATURDAY. ELSEWHERE ITS HIGH BASED CONVECTION. IT LOOKS LIKE ANOTHER HOT ONE IN THE NORTHEAST WITH LITTLE CLOUD COVER. SATURDAY NIGHT AND SUNDAY THE MID LEVEL WINDS BECOMING SOUTHWESTERLY WITH TIME AND EXPAND THE MID LEVEL MOISTURE INTO NORTHEAST ARIZONA. THUS ALL AREAS WILL HAVE AT LEAST A SLIGHT CHANCE OF AFTERNOON THUNDER. IN THE EXTENDED... EXTENDED PROGS IN SIMILAR AGREEMENT AS THEY KEEP A H5 HIGH CENTERED OVER NEW MEXICO AND DRY SOUTHWEST FLOW ALOFT OVER THE NORTHERN PORTIONS OF AZ. SO IT LOOKS DRY WITH A SLOW WARMING TREND THROUGH MID WEEK. .FGZ...NONE. JDL
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 3:17 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 28 min |
| Jul 22, 4:29 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 46 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.