Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 41, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Aug 10, 1997, 12:45 PM MST for Coconino County, Yavapai County, Arizona. It was in force for 50 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 10, 1997, 12:45 PM MST (19:45 UTC)
- Expired
- Aug 10, 1997, 1:35 PM MST
- In force
- 50 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
Counties Coconino County, AZ, Yavapai County, AZ
The radar
The Flagstaff radar (KFSX), 113 km from the middle of the area, began a volume at 19:45 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, 7.8 hours before the alert went out and 33 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
- 558 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 662 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
680 WUUS1 KFLG 101946 RRA SVRFLG AZC005-025-102035- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1245 PM MST SUN AUG 10 1997 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 135 PM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTH CENTRAL ARIZONA ...SOUTH CENTRAL COCONINO COUNTY IN CENTRAL ARIZONA ...NORTH CENTRAL YAVAPAI COUNTY AT 1244 PM MST...A SEVERE THUNDERSTORM WAS INDICATED BY FLAGSTAFF DOPPLER RADAR 26 MILES SOUTHWEST OF FLAGSTAFF OR 14 MILES NORTH NORTHEAST OF CLARKDALE MOVING NORTHEAST AT 20 MPH. PEOPLE NEAR OR IN THE PATH OF THIS SEVERE STORM SHOULD FIND SHELTER IMMEDIATELY. IF YOU ARE CAUGHT OUTSIDE...FIND SHELTER IN A STRONG BUILDING AND STAY AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN AND FREQUENT LIGHTNING.
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 10, 9:00 AM MST, 3 hours 45 minutes earlier.
Area forecast discussion, Aug 10, 9:00 AM MST, 3 hours 45 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 900 AM MST SUN AUG 10 1997 NICE LOOKING COMPLEX OVER NW AZ AT THIS TIME WORKING INTO FLG CWA. 7H-5H TROUGH TO CONTINUE TO SPREAD SOME UVV INTO THE NW OVER THE NEXT 12 HRS. MOISTURE COMBINED WITH DAYTIME HEATING SHOULD ALLOW FOR SOME DECENT CONVECTIVE DEVELOPMENT TODAY. ANOTHER THING TO WATCH IS CAA ALOFT. 5H TEMPS TO TAKE A DIP BY A DEGREE OR TWO AS TROUGH APPROACHES...WHILE THE REMAINDER OF THE CWA STILL HAS SFC DEW POINTS RUNNING ABOVE 50. 12Z FGZ SOUNDING HAS DESTABILIZED FROM PAST 24 HRS...AND WHEN MODIFIED TO REFLECT AFTERNOON CONDITIONS...CAPES RUNNING CLOSE TO 3K...A GOOD INDICATOR THAT ANY STORMS THAT DO DEVELOP TODAY MAY BE CAPABLE OF PRODUCING LARGE HAIL. WILL BE MAKING SOME UPDATES FOR THE REST OF THE PACKAGE TO JUICE POPS A BIT TO REFLECT CURRENT CONDITIONS. FLG 723 INW 523 FLG...NONE
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 10:16 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 54 min |
| Aug 10, 10:25 AM MST | Flash Flood Warning | FGZ | Coconino | 45 min |
| Aug 10, 10:25 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 45 min |
| Aug 10, 11:07 AM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
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.