Alert archive / Montana / Flash Flood Watches in 2010
Flash Flood Watch 1, NWS Missoula, MT
NWS Missoula, MT issued this flash flood watch at Jun 20, 2010, 1:40 PM MDT for Deer Lodge County, Granite County, Silver Bow County, Montana. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Jun 20, 2010, 1:40 PM MDT (19:40 UTC)
- Expired
- Jun 20, 2010, 7:01 PM MDT
- In force
- 5 hr
- Issued by
- NWS Missoula, MT
- Flood severity
- None
Counties Deer Lodge County, MT, Granite County, MT, Silver Bow County, MT
The radar
The Missoula radar (KMSX), 125 km from the middle of the area, began a volume at 19:43 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
Great_falls, MT (KTFX), launched 12:00Z, 7.7 hours before the alert went out and 239 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
- 9 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1121 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Missoula, MT wrote its last area forecast discussion before this flash flood watch went out at Jun 20, 3:25 AM MDT, 10 hours 15 minutes earlier.
Area forecast discussion, Jun 20, 3:25 AM MDT, 10 hours 15 minutes before
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</html>Hazardous weather outlook, Jun 20, 12:19 AM MDT, 13 hours 21 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MISSOULA MT 1219 AM MDT SUN JUN 20 2010 IDZ009-010-MTZ005>007-043-202100- WESTERN LEMHI COUNTY-EASTERN LEMHI COUNTY- MISSOULA/BITTERROOT VALLEYS-BITTERROOT/SAPPHIRE MOUNTAINS- BUTTE/BLACKFOOT REGION-POTOMAC/SEELEY LAKE REGION- 1219 AM MDT SUN JUN 20 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL IDAHO AND WEST CENTRAL MONTANA. .DAY ONE...TODAY AND TONIGHT STRONG THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS THE AREA THIS AFTERNOON AND EVENING. THE MAIN THREAT WILL BE WITH HEAVY RAIN AND LARGE HAIL...BUT STRONG WIND GUSTS ARE ALSO POSSIBLE. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SMALL STREAMS COULD RUN VERY HIGH MONDAY AND TUESDAY DUE TO THE HEAVY RAIN SHOWERS. OTHERWISE THERE IS NO HAZARDOUS WEATHER EXPECTED THROUGH THE COMING WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
In the hours before
Special weather statement, Jun 20, 1:01 PM MDT, 39 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 101 PM MDT SUN JUN 20 2010 MTZ007-201945- BUTTE/BLACKFOOT REGION- 101 PM MDT SUN JUN 20 2010 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN GRANITE AND NORTHERN DEER LODGE COUNTIES UNTIL 145 PM MDT... AT 1255 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 14 MILES WEST OF ANACONDA...MOVING EAST AT 15 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...WEST VALLEY AND LOST CREEK. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA. && LAT...LON 4626 11291 4615 11288 4606 11329 4624 11336 TIME...MOT...LOC 1901Z 255DEG 12KT 4617 11320 ZUMPFE
The office that day
Everything else NWS Missoula, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 8:12 PM MDT | Special Weather Statement | MSO | Sanders | 63 min |
| Jun 19, 8:34 PM MDT | Severe Thunderstorm Warning | MSO | Sanders | 27 min |
| Jun 20, 1:20 AM MDT | Flood Watch | MSO | Flathead, Lake, Lincoln, Mineral, Missoula, Powell and 1 more | 37 hr |
| Jun 20, 1:01 PM MDT | Special Weather Statement | MSO | Deer Lodge | 44 min |
| Jun 20, 2:08 PM MDT | Special Weather Statement | MSO | Silver Bow | 52 min |
| Jun 20, 2:31 PM MDT | Flash Flood Warning | MSO | Silver Bow | 60 min |
| Jun 20, 2:42 PM MDT | Areal Flood Advisory | MSO | Granite | 3 hr |
| Jun 20, 2:52 PM MDT | Severe Thunderstorm Warning | MSO | Powell | 38 min |
| Jun 20, 3:15 PM MDT | Areal Flood Advisory | MSO | Granite, Missoula | 69 min |
| Jun 20, 3:43 PM MDT | Special Weather Statement | MSO | Missoula | 47 min |
| Jun 20, 3:53 PM MDT | Special Weather Statement | MSO | Powell | 37 min |
| Jun 20, 5:32 PM MDT | Special Weather Statement | MSO | Flathead | 43 min |
| Jun 19, 8:06 PM MDT | Special Weather Statement | MSO | Clearwater | 39 min |
| Jun 19, 8:08 PM MDT | Special Weather Statement | MSO | Clearwater | 67 min |
Nearby
Flash Flood Watches in Montana, 2010Every flash flood watch in 2010
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.