Alert archive / Montana / Flash Flood Warnings in 2001

Flash Flood Warning 8, NWS Glasgow, MT

July 15, 2001Phillips County, Montana

NWS Glasgow, MT issued this flash flood warning at Jul 15, 2001, 6:05 PM MDT for Phillips County, Montana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jul 15, 2001, 6:05 PM MDT (00:05 UTC)
Expired: Jul 15, 2001, 9:00 PM MDT
In force: 3 hr
Issued by: NWS Glasgow, MT
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Phillips County, MT

The nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 0.1 hours before the alert went out and 140 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: 1428 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 2044 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 28 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 
WGUS55 KGGW 160005
FFWGGW

MTC071-160300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GLASGOW MT
605 PM MDT SUN JUL 15 2001

THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN PHILLIPS COUNTY IN NORTHEAST MONTANA

* UNTIL 900 PM MDT

* AT 553 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED
  THUNDERSTORMS WITH VERY HEAVY RAINFALL 16 MILES SOUTHEAST OF
  ZORTMAN...MOVING NORTH AT 20 MPH.

* SLOW MOVING THUNDERSTORMS ARE PRODUCING TORRENTIAL RAINFALL IN THE
  WARNED AREA. RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH
  FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLASH
  FLOODING INCLUDE...ZORTMAN...DODSON AND WAGNER

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE 
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS 
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. 
MOVE TO HMIGHER GROUND.

LAT...LON 4771 10889 4761 10781 4834 10790 4841 10834
          4795 10842 4791 10885

.END
87

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 Glasgow, MT wrote its last area forecast discussion before this flash flood warning went out at Jul 15, 2:00 PM MDT, 4 hours 5 minutes earlier.

Area forecast discussion, Jul 15, 2:00 PM MDT, 4 hours 5 minutes before

NORTHEAST MONTANA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GLASGOW MT
200 PM MDT SUN JUL 15 2001

SHORT TERM...TSRA BUILDING OVER SW MT EARLY THIS AFTERNOON SHOULD
CONTINUE TO MOVE NE INTO THE AREA LATER TODAY. A FEW CELLS HAVE
FIRED JUST TO THE WEST OF THE CWFA. SO FAR NO BUILD UPS YET IN THE
GGW CWFA. DEW POINTS IN THE 50S OVER THE SW 1/2 OF THE CWFA...AND IN
THE 60S IN THE NE HALF...KSDY WITH A DEW POINT AROUND 70.

VIS SAT/H2O VAP SHOW A RATHER STRONG VORT MAX OVER CENTRAL ID MOVING
NE THROUGH THE FLOW. TEMPS WELL INTO THE UPPER 80S TO AROUND 90 IN
NC MT THIS EARLY PM ALREADY. AS THE TSRA FROM THE SW INTERACT WITH
THE WARMER AND MORE MOIST AIR OVER THE AREA...THEY SHOULD FIRE UP
PRETTY GOOD OVER THE CWFA. THE ETA (MODEL OF CHOICE) HAS TWO AREAS
OF POSITIVE OMEGA THIS AFTERNOON OVER THE REGION...ONE OVER THE
SOUTHERN AND SOUTHEASTERN ZONES...AND ONE OVER THE WESTERN ZONES.
CONVECTIVE PARAMETERS ARE ALL THERE WITH THE SW FLOW...THEREFORE
WILL GO LIKELY POPS THIS EVENING IN THE WEST AND HIGH SCATTERED POPS
IN THE EAST.

MONDAY...ANOTHER WAVE MOVES THROUGH DURING THE EVENING HOURS FOR
MORE PM TSRA. MONDAY NIGHT THE H5 LOW MOVES FURTHER INLAND AND
ALLOWS FOR MORE COOLER AIR TO WRAP INTO THE WESTERN PART OF THE
STATE AND SHOULD START TO EFFECT THE CWFA ON TUESDAY...HOWEVER SW
FLOW CONTINUES THROUGH THE SHORT TERM...THEREFORE SCT TYPE POPS LOOK
GOOD ALL THE WAY THROUGH.

FOR TEMPS...LEANED MORE TOWARDS THE FWC NUMBERS FOR THE SHORT TERM
FORECAST PERIODS.   PROTON

EXTENDED...SOUTHWEST FLOW ALOFT WILL CONTINUE AT THE BEGINNING OF
THE PERIOD AS AN UPPER LOW MOVES EAST THROUGH CENTRAL ALBERTA AND
SASKATCHEWAN...WITH AN UPPER RIDGE ENTRENCHED OVER THE MIDWEST
STATES. SEVERAL DISTURBANCES WILL MOVE THROUGH THE AREA WEDNESDAY
AND THURSDAY FOR A CHANCE OF PRECIPITATION. FLOW ALOFT THEN TURNS
ZONAL ON FRIDAY FOR DRYING CONDITIONS AS AN UPPER LOW CUTS OFF ALONG
THE PACIFIC NORTHWEST COAST. AS THIS LOW DIGS OVER THE WEEKEND A
SHORTWAVE RIDGE DEVELOPS OVER CENTRAL MONTANA BY SUNDAY.
TEMPERATURES WILL BE SLIGHTLY BELOW NORMAL AT MID WEEK AS HEIGHTS
AND THICKNESSES LOWER...THEN SLOWLY WARM BY THE WEEKEND.  WATERHOUSE

KGGW 062/085 062/082 058/080 056/078 056/081 058/083 059/085
     BBTTBBB  946233/9933222
KGDV 065/088 064/084 060/082 057/079 056/080 057/082 058/084
     BBTTBBB  945233/9933222

.GGW...SVR T%STM WATCH TIL 8 PM ZONES 021-022.

The office that day

Everything else NWS Glasgow, MT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 15, 7:19 PM MDT	Severe Thunderstorm Warning	GGW	Valley	56 min
Jul 15, 7:33 PM MDT	Severe Thunderstorm Warning	GGW	Prairie	57 min

Nearby

Flash Flood Warnings in Montana, 2001 Every flash flood warning in 2001

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.