Alert archive / Arizona / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 89, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Sep 13, 1997, 5:31 AM MST for Coconino County, Arizona. It was in force for 64 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
- Sep 13, 1997, 5:31 AM MST (12:31 UTC)
- Expired
- Sep 13, 1997, 6:35 AM MST
- In force
- 64 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Coconino County, AZ
The radar
The Flagstaff radar (KFSX), 150 km from the middle of the area, began a volume at 12:30 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, 0.5 hours before the alert went out and 68 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
- 135 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1145 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 98 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 131231 RRA SVRFLG AZC005-131335- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 531 AM MST SAT SEP 13 1997 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF AZ HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 635 AM MST FOR PEOPLE IN THE FOLLOWING LOCATION... IN NORTH CENTRAL ARIZONA ...SOUTHWESTERN AND SOUTH CENTRAL COCONINO COUNTY AT 528 AM MST...A SEVERE THUNDERSTORM WAS INDICATED BY FLAGSTAFF DOPPLER RADAR AND SPOTTER REPORTS 15 MILES NORTHWEST OF WILLIAMS MOVING NORTHEAST AT 25 MPH. A SPOTTER IN SOUTHWESTERN COCONINO COUNTY REPORTED PENNY SIZE HAIL AS THIS STORM MOVED OVER THE AREA. NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THIS STORM WAS STRENGTHENING. THIS WARNING INCLUDES THE COMMUNITY OF VALLE. PEOPLE NEAR OR IN THE PATH OF THIS SEVERE STORM SHOULD FIND SHELTER. IF YOU ARE CAUGHT OUTSIDE...TRY TO FIND SHELTER IN A WELL PROTECTED AREA 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 Sep 13, 2:32 AM MST, 2 hours 59 minutes earlier.
Area forecast discussion, Sep 13, 2:32 AM MST, 2 hours 59 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 AM MST SAT SEP 13 1997 00Z MODELS IN FAIR AGREEMENT IN HANDLING LARGE SCALE FEATURES OVER THE SHORT TERM. 5H RIDGE TO CONTINUE TO DOMINATE WEATHER PATTERN THROUGH 24 HRS...AS MOIST SFC LAYER REMAINS IN PLACE OVER THE CWA. DEWPOINT VALUES STILL RUNNING IN THE MID 50S ACROSS MOST OF THE CWA THIS MORNING...WITH STRONG NOCTURNAL STORMS CONTINUING TO DEVELOP OVER SOUTHERN YAVAPAI COUNTY. SHOULD SEE ANOTHER ROUND OF THUNDERSTORM ACTIVITY AGAIN THIS AFTERNOON. BY 18-24 HOURS SOME DIFFERENCES BEGIN TO CREEP INTO MODEL SOLUTIONS...ESPECIALLY IN REGARDS TO HANDLING LOW LEVEL MOISTURE WITH THE ETA-NGM. ETA PREFERS TO KEEP MOISTURE PLUME FURTHER WEST...WHILE NGM...AS IT HAS IN THE PAST FEW RUNS WANTS TO DRY US OUT. A LOOK AT THE 00Z SOUNDINGS SHOW THAT LOW LEVEL MOISTURE HAS BECOME SCOURED OUT...BUT JUST A TAD. DO NOT EXPECT ENOUGH MIXING TO OCCUR TODAY TO DRY US OUT TOTALLY...SO A SCATTERING OF THUNDERSTORM DEVELOPMENT LIKELY. FOR DAY 2 AND THE EXTENDED...ALL EYES ARE ON LINDA. EFFECTS OF LINDA WILL LIKELY NOT BE FELT WITHIN SECOND PERIOD...NGM-ETA IN FAIR ENOUGH AGREEMENT IN SHOWING SOME HIGH LEVEL MOISTURE FROM CLOUD SHIELD FROM THE HURRICANE WORKING INTO THE STATE. THIS MAY ACTUALLY HELP SUPPRESS DIURNAL CONVECTION FOR SUNDAY. HOWEVER...A CONVECTIVE TRIGGER MAY STILL BE AVAILABLE IN THE FORM OF WEAK DISTURBANCE PROGGED BY ETA-NGM TO MOVE NORTHWARD OUT OF CENTRAL MX AHEAD OF LINDA. NGM INDICATING FEATURE MAINLY AT LOWEST LEVELS...WHILE ETA A BIT STRONGER WITH IT. THINK THIS MAY BE MAINLY DUE TO RESOLUTION... SINCE AVN NOT SHOWING MUCH AT ALL IN THE WAY OF DYNAMICS MOVING INTO THE CWA. THINKING HERE IS THAT ON SUNDAY...ANY DISTURBANCE THAT DOES MOVE ACROSS CWA WILL BE ENOUGH TO OFFSET HIGH CLOUDS FROM LINDA...SO WILL KEEP SCATTERED POPS IN THE FORECAST FOR THE FAVORED AREAS. LATEST NHC GUIDANCE SHOWING LITTLE CHANGE OVER PREVIOUS FORECAST. STILL HIGHLY UNCERTAIN AS TO WHETHER SIGNIFICANT MOISTURE WILL MAKE IT TO NORTHERN AZ BY MONDAY...SITUATION WILL NEED TO BE WATCHED CLOSELY. FLG 4242 INW 3232 FLG...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 13, 1:45 AM MST | Severe Thunderstorm Warning | FGZ | Gila, Yavapai | 90 min |
| Sep 13, 10:28 AM MST | Flash Flood Warning | FGZ | Gila | 117 min |
| Sep 13, 10:46 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 59 min |
| Sep 13, 11:42 AM MST | Severe Thunderstorm Warning | FGZ | Navajo | 43 min |
| Sep 13, 4:13 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 32 min |
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.