Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 64, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 17, 1997, 3:34 PM MST for Yavapai County, Arizona. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 17, 1997, 3:34 PM MST (22:34 UTC)
- Expired
- Aug 17, 1997, 4:25 PM MST
- In force
- 51 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 22:38 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, 10.6 hours before the alert went out and 98 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
- 72 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 1027 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFLG 172235 RRA SVRFLG AZC025-172325- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 334 PM MST SUN AUG 17 1997 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 425 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN CENTRAL ARIZONA ...NORTHEASTERN YAVAPAI COUNTY AT 333 PM MST...A SEVERE THUNDERSTORM WAS INDICATED BY FLAGSTAFF DOPPLER RADAR IN THE VICINITY OF COTTONWOOD MOVING NORTHEAST AT 10 MPH. SOME LOCATIONS IN THE WARNING AREA INCLUDE... COTTONWOOD AND CLARKDALE. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MPH... DESTRUCTIVE HAIL...FREQUENT LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.
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 17, 2:02 PM MST, 1 hour 32 minutes earlier.
Area forecast discussion, Aug 17, 2:02 PM MST, 1 hour 32 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 200 PM MST SUN AUG 17 1997 PASSAGE OF A WEAK DISTURBANCE WHICH TRIGGERED EARLY MORNING CONVECTION IN YAVAPAI COUNTY HAS PROVIDED A LATE START TO AFTERNOON ACTIVITY IN WESTERN PORTIONS OF THE CWA. LATE MORNING START TO ACTIVITY OVER THE DESERTS MAY HAVE ALSO BLOCKED OPTIMAL MOISTURE ADVECTION INTO THIS REGION AS WELL. HOWEVER...KFSX 88D IMAGERY HAS BEEN INDICATING A SLOW WESTWARD PROGRESSION OF THE SHOWERS AND THUNDERSTORMS EARLY THIS AFTERNOON. SO...WILL HANG ON TO HIGH POPS OVER THE CURRENTLY DRY WESTERN ZONES INTO TONIGHT. STILL CONCERNED ABOUT PORTIONS OF NORTHWEST COCONINO COUNTY FOR A FLASH FLOOD WATCH TONIGHT AS THE 12Z ETA AND AVN CONTINUE TO FORECAST A DECENT PV ANOMALY THROUGH THE REGION BY 06Z. TIME SEEMS TO BE ON OUR SIDE HERE SO WILL HOLD OFF. FLASH FLOOD WATCH CURRENTLY IN EFFECT LOOKING GOOD FOR ZONE 18 AND HOLDING ON FOR ZONE 8 PER ABOVE. OTHERWISE...PLENTY OF RESIDUAL MOISTURE ON MONDAY FOR ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS...BUT HAVE TONED DOWN WESTERN AREAS A BIT AS DYNAMICS LACKING. MOISTURE FROM THE TROPICAL SYSTEM OFF BAJA PROGGED BY THE MODELS TO MOVE INTO SOUTHERN CALIFORNIA ON TUESDAY...THOUGH THE AVN BLEEDS SOME H5 MOISTURE ASSOCIATED WITH THIS SYSTEM INTO NORTHERN AZ. ANY EASTWARD CHANGE IN TRAJECTORY WITH THIS SYSTEM COULD SIGNIFICANTLY AFFECT THE GOING FORECAST OF SCATTERED SHOWERS AND THUNDERSTORMS. OTHERWISE...TEMPS SHOULD WARM A BIT THROUGH THE PERIOD AND FWC AND FAN GUIDANCE ARE IN THE BALLPARK. FLG 6555 INW 4444 PASSETTI FLG...NONE
Nearby
Severe Thunderstorm Warnings in Arizona, 1997Every severe thunderstorm warning in 1997
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.