Alert archive / Arizona / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 13, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 26, 1999, 6:06 PM MST for Coconino County, Arizona. It was in force for 44 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 26, 1999, 6:06 PM MST (01:06 UTC)
- Expired
- Jul 26, 1999, 6:50 PM MST
- In force
- 44 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 01:09 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, 1.1 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
- 178 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 1539 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KFLG 270111 SVRFLG AZC005-270150- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 606 PM MST MON JUL 26 1999 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHEASTERN COCONINO COUNTY IN NORTH CENTRAL ARIZONA * UNTIL 650 PM MST * AT 554 PM MST... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 64 MILES SOUTHEAST OF FLAGSTAFF OR 12 MILES NORTH OF FOREST LAKES... MOVING NORTHWEST AT 10 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... CHEVELON CANYON CAMPGROUND IN BY 610 PM MST FOREST SERVICE ROAD 169 NEAR DIP ROAD BY 625 PM MST WALLACE ROAD AT OR NEAR FOREST ROAfD 211 BY 645 PM MST DAMAGING WINDS AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! JD
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 Jul 26, 2:30 PM MST, 3 hours 36 minutes earlier.
Area forecast discussion, Jul 26, 2:30 PM MST, 3 hours 36 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 230 PM MST MON JUL 26 1999 SYNOPSIS...A MOIST AIR MASS WILL REMAIN ACROSS NORTHERN ARIZONA WITH WIDESPREAD AFTERNOON SHOWERS AND THUNDERSTORMS OCCURRING THROUGH MOST OF THE COMING WEEK. DAYTIME TEMPERATURES WILL REMAIN NEAR SEASONAL NORMALS. DISCUSSION...THE AIR MASS OVER CENTRAL AND WESTERN PORTIONS OF ARIZONA WILL REMAIN MOIST THE NEXT COUPLE OF DAYS. THE GOES SOUNDER PRECIPITABLE WATER PRODUCT WAS SHOWING VALUES IN THE 1.5 TO 2.0 INCH RANGE FROM YAVAPAI COUNTY SOUTHWARD INTO MEXICO DURING THE AFTERNOON. THE 12Z ETA IS CONTINUING THIS TREND OVER THE NEXT 48- HOUR PERIOD. WITH THIS MUCH MOISTURE IMPINGING ON THE TERRAIN OF NORTHERN ARIZONA THUNDERSTORMS ARE SURE TO DEVELOP EACH DAY. THE SUBTROPICAL RIDGE WILL CONTINUE TO PROPAGATE WESTWARD TOWARDS THE FOUR-CORNERS REGION AND IN RESPONSE THE GREAT BASIN THERMAL LOW IS CERTAIN TO INTENSIFY. AS A RESULT CAN SEE NO END IN SIGHT TO THE NORTHWARD STREAM OF MOISTURE FROM MEXICO. THE SHEAR ALOFT ON TUESDAY WILL BE SOMEWHAT BETTER FOR HEAVY RAIN PRODUCING STORMS WITH 5 TO 10 KT SOUTH WINDS BELOW 500 MB AND 10 TO 20 KT FLOW ABOVE 400 MB. CELLS THAT FORM WILL BE LESS TILTED AND SLOWER MOVING WITH TRAINING BEHAVIOR ONCE AGAIN LIKELY. ALSO...AS AN INVERTED TROUGH...CURRENTLY OVER BIG BEND COUNTRY IN TEXAS...MOVES INTO ARIZONA FROM THE SOUTHEAST ON TUESDAY EXPECT ABSOLUTE VORTICITY ABOVE 300 MB TO LOWER AGAIN WITH WEAK INERTIAL STABILITY POSSIBLY DEVELOPING ALONG WITH LARGER SCALE ORGANIZATION (MODELS ARE TO BE INTERPRETED WITH GREAT CAUTION OUT PAST 18 HOURS THIS TIME OF YEAR). IN ANY CASE THERE PROBABLY WILL BE AN UPSWING IN THE COVERAGE OF HEAVY RAINFALL ON TUESDAY. STORMS WILL REMAIN NUMEROUS ALONG THE MOGOLLON RIM INTO YAVAPAI AND COCONINO COUNTIES AND ISOLATED ALONG THE UTAH BORDER AND NORTHEAST. OTHERWISE...NO CHANGES TO THE CURRENT POP..TEMPERATURE AND WIND FORECAST TRENDS. IN THE EX8TENDED...MID TO UPPER HIGH PRESSURE WILL GRADUALLY PROPAGATE WESTWARD ACROSS THE FOUR CORNERS AREA AND INTO SOUTHERN UTAH. AS A RESULT AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS ARE EXPECTED TO CONTINUE. MCCOLLUM .FLG...NONE.
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 11:45 AM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 45 min |
Nearby
Severe Thunderstorm Warnings in Arizona, 1999Every severe thunderstorm 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.