Alert archive / Arizona / Flash Flood Warnings in 1998
Flash Flood Warning 16, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Sep 11, 1998, 11:31 AM MST for Coconino County, Arizona. It was in force for 119 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 11, 1998, 11:31 AM MST (18:31 UTC)
- Expired
- Sep 11, 1998, 1:30 PM MST
- In force
- 119 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Coconino County, AZ
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 6.5 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1435 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 158 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 111834 FFWFLG AZC005-112030- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1131 AM MST FRI SEP 11 1998 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN COCONINO COUNTY IN NORTH CENTRAL ARIZONA INCLUDING THE VILLAGE OF SUPAI * UNTIL 130 PM MST * AT 1130 AM MST...NATIONAL WEATHER SERVICE DOPPLER WEATHER RADAR DETECTED ANOTHER AREA OF LOCALLY HEAVY RAIN AND EMBEDDED THUNDERSTORMS MOVING ACROSS NORTHWESTERN COCONINO COUNTY INCLUDING HAVASUPAI CANYON AND THE VILLAGE OF SUPAI. * SPOTTER REPORTS FROM THE VILLAGE OF SUPAI REPORTED HEAVY RAIN AT 1130 AM WITH STREAMS RISING. THUS...THE FLASH FLOOD WARNING FOR THIS AREA HAS BEEN EXTENDED. IF YOU ARE IN THE WARNING AREA... MOVE TO HIGHER GROUND AT ONCE. DO NOT DRIVE ACROSS WATER COVERED ROADS. AVOID ALL AREAS SUBJECT TO FLOODING.
What forecasters said that day
The local office's own words before this flash flood 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 flash flood warning went out at Sep 11, 9:00 AM MST, 2 hours 31 minutes earlier.
Area forecast discussion, Sep 11, 9:00 AM MST, 2 hours 31 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 900 AM MST FRI SEP 12 1998 SYNOPSIS...A UPPER LEVEL LOW PRESSURE SYSTEM ALONG THE CALIFORNIA/NEVADA BORDER WILL KEEP A VERY MOIST SOUTHERLY FLOW ACROSS NORTHERN ARIZONA TODAY FOR MORE CLOUDS...SHOWERS AND THUNDERSTORMS OVER THE AREA. DISCUSSION...THUNDERSTORMS CONTINUE ACROSS YAVAPAI AND WESTERN COCONINO COUNTIES THIS MORNING. LOCALLY HEAVY RAINFALL...UP TO 1 INCH HAS BEEN REPORTED AT SEVERAL LOCATIONS IN WESTERN PART OF CWFA SINCE 12Z. VORT MAX THAT DEVELOPED OFF NORTHERN TIP OF BAJA CALIF LAST NIGHT IS MOVING NORTH ALONG WESTERN AZ ATTM. THIS FEATURE COUPLED WITH RIGHT REAR ENTRANCE OF 250MB JET...VERY MOIST SOUTHERLY FLOW...PRECIP WATER IN 0.75 TO 1.25 INCH RANGE OVER WESTERN CWFA PROMPTED FLASH FLOOD WATCH FOR WESTERN ZONES OF CWFA AND FLASH FLOOD WARNING FOR HAVASUPAI CANYON AND SUPAI VILLAGE. UPPER LEVEL LOW IN NEVADA PROGGED TO LIFT OUT OF AREA SAT PM TIME FRAME...BUT SLOW PROGRESS EXPECTED DUE TO BLOCKING DOWNSTREAM RIDGE. NEXT FEATURE OF CONCERN FOR WEEKEND IS REMNANTS OF TS FRANCES AS MOISTURE EXPECTED TO MOVE INTO EASTERN AZ. BOTTOM LINE...NORTHERN AZ EXPECTED TO STAY WET NEXT 48 HRS. TW .FLG...FLASH FLOOD WATCH FOR YAVAPAI AND WESTERN COCONINO UNTIL 8PM MST.
In the hours before
Special weather statement, Sep 11, 9:30 AM MST, 2 hours 1 minute before
AZZ004>018-101900- AREA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST FRI SEP 11 1998 ...SHOWERS...THUNDERSTORMS AND LOCALLY HEAVY RAINFALL ACROSS NORTHERN ARIZONA TODAY... SPOTTER REPORTS OF SIGNIFICANT THUNDERSTORM ACTIVITY AND RAINFALL AMOUNTS REQUESTED. SEVERAL INGREDIENTS HAVE COME TOGETHER FOR STRONG THUNDERSTORMS AND LOCALLY HEAVY RAINFALL OVER NORTHWESTERN ARIZONA TODAY. AN UPPER LEVEL DISTURBANCE MOVING NORTH ACROSS WESTERN ARIZONA IN CONJUNCTION WITH A VERY MOIST AIRMASS AND STRONG SOUTHERLY WINDS WILL PRODUCE SHOWERS AND THUNDERSTORMS ACROSS NORTHWEST ARIZONA TODAY. LOCALLY HEAVY RAINFALL IS EXPECTED ACROSS YAVAPAI AND COCONINO COUNTIES THROUGHOUT THE DAY. THESE STORMS WILL MOVE TO THE NORTH AT 20 TO 25 MPH. A SOMEWHAT DRIER AIRMASS RESIDES OVER NAVAJO AND APACHE COUNTIES. SHOWERS AND THUNDERSTORMS THAT DEVELOP OVER THE NORTHEASTERN PART OF THE STATE ARE NOT EXPECTED TO BE AS STRONG AS STORMS IN THE WESTERN PART OF THE STATE. TW
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 7:28 PM MST | Severe Thunderstorm Warning | FGZ | Coconino | 32 min |
| Sep 11, 8:23 AM MST | Flash Flood Warning | FGZ | Coconino | 3 hr |
| Sep 11, 1:27 PM MST | Flash Flood Warning | FGZ | Coconino | 93 min |
Nearby
Flash Flood Warnings in Arizona, 1998Every flash flood warning in 1998
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.