Alert archive / Arizona / Flash Flood Warnings in 1999

Flash Flood Warning 2, NWS Flagstaff, AZ

July 11, 1999Gila County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 11, 1999, 3:43 PM MST for Gila County, Arizona. It was in force for 92 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: Jul 11, 1999, 3:43 PM MST (22:43 UTC)
Expired: Jul 11, 1999, 5:15 PM MST
In force: 92 min
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 22:46 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 (KPSR), launched 12:00Z, 10.7 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 160 J/kg
Mixed-layer CIN: -184 J/kg
Mixed-layer LCL: 1545 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: -6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KFLG 112248
FFWFLG
AZC007-120015-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
343 PM MST SUN JUL 11 1999

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN GILA COUNTY IN CENTRAL ARIZONA

* UNTIL 515 PM MST

* AT 340 PM MST...THE GILA COUNTY SHERIFF'S OFFICE REPORTED TWO TO
THREE FEET OF WATER ACROSS FOREST SERVICE 199 OR HOUSTON MESA
ROAD WHERE THE EAST VERDE RIVER CROSSES. THUNDERSTORMS PRODUCING
HEAVY RAINFALL WILL CONTINUE OVER THE WARNING AREA. FLASH
FLOODING IS IMMINENT NEAR THE JUNCTION OF STATE HIGHWAY 87 AND
HOUSTON MESA ROAD.


* MOVE TO HIGHER GROUND IMMEDIATELY AND DO NOT ATTEMPT TO DRIVE
ACHROSS FLOODED ROADS.


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 11, 2:50 PM MST, 53 minutes earlier.

Area forecast discussion, Jul 11, 2:50 PM MST, 53 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
250 PM MST SUN JUL 11 1999

SYNOPSIS...SHOWERS AND THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL
WILL CONTINUE ACROSS MUCH OF NORTHERN ARIZONA INTO THE START OF THE
WORK WEEK. DRIER AIR WILL CONTINUE TO MOVE INTO NORTHEAST ARIZONA
TONIGHT AND MONDAY WHICH WILL DECREASE THE SHOWER ACTIVITY IN THIS
AREA. THE HIGH PRESSURE SYSTEM NEAR THE FOUR CORNERS AREA WILL MOVE
EASTWARD INTO NEW MEXICO BY MIDWEEK.  HOWEVER...THERE WILL BE
ENOUGH MOISTURE IN THE LOW LEVELS OF THE ATMOSPHERE FOR SCATTERED
SHOWERS AND THUNDERSTORMS TO CONTINUE THROUGH THE WEEK.

DISCUSSION...FORECAST FOCUS FOR TONIGHT CONTINUES TO BE LOCALLY
HEAVY RAINFALL IN WESTERN COCONINO COUNTY...YAVAPAI COUNTY AND THE
RIM AREA.  A TONGUE OF 1.5 TO 2.0 INCHES OF PRECIPITABLE WATER
STRETCHES FROM THE SOUTHWEST DESERT NORTHWARD TO THE GRAND CANYON
AREA. THIS COMBINED WITH WEAK VORT MAX AND 7H THETA RIDGE OVER
WESTERN THIRD OF FA IS PROVIDING FOCUS FOR LOCALLY HEAVY RAINFALL
OCCURRING TODAY. HAVE ISSUED FFW FOR SUPAI VILLAGE WITH 0.75 INCHES
IN 30 MINUTES AT GCN AND REPORTS OF FLOW COMING UP RAPIDLY IN
CATARACT CREEK. ONLY SUBTLE CHANGES EXPECTED NEXT TWO
DAYS...PRIMARILY DRY AIR MOVING INTO NE SECTION OF FA...BUT HIGH
THETA AIR REMAINS ENTRENCHED OVER WESTERN THIRD OF FA. ABUNDANT
MOISTURE REMAINS FOR SCATTERED TO LIKELY POPS OVER MOST OF THE
FA...WITH THE EXCEPTION OF FAR NE.

EXTENDED...FOUR CORNERS HIGH MOVES EASTWARD MIDWEEK WITH MRF
SHOWING HINT AT SOUTH TO SOUTHWEST FLOW DEVELOPING. HOWEVER...AS
NEARBY OFFICES MENTIONED IN BLAST-UP COORD CALL...WILL HAVE TO
WATCH INVERTED TROF OVER BIG BEND AREA MOVING INTO THE STATE AROUND
WED TIME FRAME.  FOR NOW...CONFIDENCE NOT HIGH ENOUGH TO INTRODUCE
ANY DRYING TREND...SO WILL GO WITH CONTINUED CHANCE SHOWERS/TSTORMS
THROUGH THE PERIOD.

TW

.FLG...FLASH FLOOD WATCH UNTIL 600 PM MST FOR ZONES
       4/6/7/8/15/37/38.  SEE FLASH FLOOD WATCH STATEMENT FOR
       SPECIFIC DETAILS.

The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 2:29 PM MST	Flash Flood Warning	FGZ	Coconino	2 hr

Nearby

Flash Flood Warnings in Arizona, 1999 Every flash flood warning in 1999

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.