Alert archive / Arizona / Flash Flood Warnings in 1998
Flash Flood Warning 8, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this flash flood warning at Jul 31, 1998, 12:54 PM MST for Gila County, Arizona. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 31, 1998, 12:54 PM MST (19:54 UTC)
- Expired
- Jul 31, 1998, 3:00 PM MST
- In force
- 2 hr
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Gila County, AZ
The radar
The Flagstaff radar (KFSX), 93 km from the middle of the area, began a volume at 19:58 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 (KPHX), launched 12:00Z, 7.9 hours before the alert went out and 115 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
- 493 J/kg
- Mixed-layer CIN
- -209 J/kg
- Mixed-layer LCL
- 1757 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 19 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 311958 FFWFLG AZC007-312155- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 1254 PM MST FRI JUL 31 1998 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHEASTERN GILA COUNTY IN CENTRAL ARIZONA * UNTIL 300 PM MST * AT 1250 PM MST...FLAGSTAFF DOPPLER RADAR SHOWED A NEARLY STATIONARY STRONG THUNDERSTORM PRODUCING VERY HEAVY RAINFALL NEAR CANYON DAY...JUST WEST OF FORT APACHE. RADAR ESTIMATED OVER 3 INCHES OF RAIN WITH THIS STORM SINCE NOON MST. * DANGEROUS RAPID RISES IN WATER LEVELS OF WASHES AND CREEKS FEEDING INTO THE WHITE RIVER NEAR CANYON DAY AND HIGHWAY 73 ARE LIKELY THROUGH 3 PM MST. 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 Jul 31, 9:00 AM MST, 3 hours 54 minutes earlier.
Area forecast discussion, Jul 31, 9:00 AM MST, 3 hours 54 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 900 AM MST FRI JUL 31 1998 SYNOPSIS...DRIER AIR WILL BE MOVING OVER NORTHERN ARIZONA FOR DECREASED THUNDERSTORM ACTIVITY TODAY...PARTICULARLY IN THE WESTERN SECTIONS OF THE STATE...WITH PARTLY CLOUDY SKIES AND ONLY ISOLATED THUNDERSTORMS IN THE EAST. DAYTIME TEMPERATURES WILL SHOW LITTLE CHANGE INTO THE WEEKEND. DISCUSSION...FAIRLY DECENT DRYING HAS OCCURRED OVER MOST OF THE WESTERN PORTION OF THE CWA. RESIDUAL MOISTURE REMAINS OVER EASTERN YAVAPAI COUNTY...AND FROM FLAGSTAFF...TO THE EAST. WITH DECENT CAP NOTED ON 12Z FLG SOUNDING...THE RACE IS ON TO SEE IF DAYTIME HEATING...AND LOW LEVEL MOISTURE WILL COMBINE TO CAUSE DEVELOPMENT OVER EASTERN YAVAPAI COUNTY...AND THE WESTERN RIM AREA BEFORE IT MOVES OUT OF THE AREA TO THE EAST. FOR NOW WILL BET THAT DAYTIME HEATING WILL WIN OUT...AND WILL INTRODUCE SOME ISOLATED POPS INTO FCST PACKAGE OVER ZONE 15 AND EASTERN PORTIONS OF ZN 8. ALREADY A FEW CU HERE STARTING TO SHOW SIGNS THAT THEY MAY BUST THROUGH CAP. OTHERWISE FCSTS IN GOOD SHAPE. MCGRATH FLG -0- INW 0-- .FLG...NONE.
In the hours before
Special weather statement, Jul 31, 9:05 AM MST, 3 hours 49 minutes before
AZZ004>018-311900- AREA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 905 AM MST FRI JUL 31 1998 ...ISOLATED THUNDERSTORMS EXPECTED OVER THE MOUNTAINS OF EAST CENTRAL ARIZONA TODAY... SPOTTER ACTIVATION SHOULD NOT BE REQUIRED TODAY. DISCUSSION...DRYER AIR WILL CONTINUE TO SETTLE IN OVER MOST OF NORTHERN ARIZONA TODAY...AS A DISTURBANCE PASSES TO OUR NORTH. THIS DISTURBANCE WILL INCREASE DRY SOUTHWEST FLOW AT THE MID LEVELS. NEAR THE SURFACE...SOME MOISTURE REMAINS...BUT NOT QUITE ENOUGH TO CAUSE THUNDERSTORM DEVELOPMENT OVER MOST OF NORTHERN ARIZONA. HOWEVER... AREAS SUCH AS THE WHITE MOUNTAINS AND ALONG THE MOGOLLON RIM EAST OF FLAGSTAFF WILL SEE SOME ISOLATED SHOWERS AND THUNDERSTORMS BY EARLY THIS AFTERNOON. THESE THUNDERSTORMS ARE NOT EXPECTED TO REACH SEVERE LIMITS. MCGRATH
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 2:29 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 46 min |
| Jul 31, 2:29 PM MST | Severe Thunderstorm Warning | FGZ | Apache | 46 min |
| Jul 31, 3:27 PM MST | Flash Flood Warning | FGZ | Navajo | 2 hr |
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; radar from the NEXRAD Level II archive.