Alert archive / Arizona / Flash Flood Warnings in 1998

Flash Flood Warning 7, NWS Flagstaff, AZ

July 22, 1998Coconino County, Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Jul 22, 1998, 5:51 PM MST for Coconino County, Yavapai County, Arizona. It was in force for 114 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 22, 1998, 5:51 PM MST (00:51 UTC)
Expired: Jul 22, 1998, 7:45 PM MST
In force: 114 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 00:53 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 00:00Z, 0.9 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.

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: 170 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 31 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 230053
FFWFLG
AZC005-025-230245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
551 PM MST WED JUL 22 1998

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL COCONINO COUNTY IN NORTH CENTRAL ARIZONA
  NORTHEASTERN YAVAPAI COUNTY IN CENTRAL ARIZONA

* UNTIL 745 PM MST

* AT 545 PM MST...DOPPLER WEATHER RADAR DETECTED ANOTHER AREA OF
  SHOWERS AND THUNDERSTORMS MOVING NORTHWEST TOWARD SEDONA AND OAK
  CREEK.  THIS ACTIVITY HAS PRODUCED HEAVY RAIN OVER NORTHWEST GILA
  COUNTY AND THIS IS EXPECTED TO MOVE INTO THE SEDONA...OAK CREEK
  AREA AFTER 630 PM MST. THUS...THE FLASH FLOOD WARNING FOR THIS
  AREAZ 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.

KHW

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 22, 2:00 PM MST, 3 hours 51 minutes earlier.

Area forecast discussion, Jul 22, 2:00 PM MST, 3 hours 51 minutes before

NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
200 PM MST WED JUL 22 1998

SYNOPSIS...MONSOONAL MOISTURE WILL REMAIN ENTRENCHED OVER NORTHERN
ARIZONA THE NEXT SEVERAL DAYS. AS A RESULT...SCATTERED SHOWERS AND
THUNDERSTORMS CAN BE EXPECTED FROM LATE MORNING THROUGH MID EVENING
EACH DAY...WITH THE MOST ACTIVITY OCCURRING FROM THE MOGOLLON RIM
INTO YAVAPAI AND GILA COUNTIES. THE MOISTURE AND CLOUD COVER WILL
LEAD TO HIGH TEMPERATURES A LITTLE BELOW AVERAGE FOR THIS TIME OF
YEAR.

DISCUSSION...NUMEROUS THUNDERSTORMS OVER CWA ATTM. HEAVY RAIN BUT NO
HAIL REPORTS. QUITE A BIT OF ACTIVITY UPSTREAM AS WELL. REPORTS OF
VERY HEAVY RAIN AND POTENTIAL FLOOD PROBLEMS...SO OFFICE CONSENSUS IS
TO GO WITH FLASH FLOOD WATCH FOR ALL BUT NE ZONES. LIKELY THERE WILL
BE AT LEAST ONE MINOR PERTURBATION TO KEEP CONVECTION GOING INTO
EVENING...WOULD EXPECT AREAL COVERAGE TO DROP OFF SOME AFTER SUNSET
THOUGH.  FOR LATER PERIODS...DEEPEST MOISTURE AXIS GENERALLY OVR
SOUTHWEST THIRD OF STATE AND SEE NO REASON NOT TO GO WITH A
PERSISTENT MONSOON FORECAST...ZNS 8...15...16 AND 18 THE WETTEST...NE
CORNER DRIEST BUT STILL ACTIVE.

FLG 463  INW 312
BET
FLG...FLASH FLOOD WATCH TIL 10 PM MST FOR ZNS 4>8...12>18.

Nearby

Flash Flood Warnings in Arizona, 1998 Every 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.