Alert archive / Wyoming / Flash Flood Warnings in 2011
Flash Flood Warning 9, NWS Riverton, WY
NWS Riverton, WY issued this flash flood warning at Jul 12, 2011, 2:26 PM MDT for Johnson County, Wyoming. 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 as issued.
The facts
- Issued
- Jul 12, 2011, 2:26 PM MDT (20:26 UTC)
- Expired
- Jul 12, 2011, 5:14 PM MDT
- In force
- 3 hr
- Issued by
- NWS Riverton, WY
- Area
- Storm-based polygon
- Flood severity
- None
County Johnson County, WY
The radar
The Riverton/Lander radar (KRIW), 163 km from the middle of the area, began a volume at 20:25 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
Riverton, WY (KRIW), launched 12:00Z, 8.4 hours before the alert went out and 159 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
- 24 J/kg
- Mixed-layer CIN
- -231 J/kg
- Mixed-layer LCL
- 1192 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 104 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
009
WGUS55 KRIW 122026
FFWRIW
WYC019-122330-
/O.NEW.KRIW.FF.W.0009.110712T2026Z-110712T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
226 PM MDT TUE JUL 12 2011
THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A
* FLASH FLOOD WARNING FOR...
WEST CENTRAL JOHNSON COUNTY IN NORTH CENTRAL WYOMING...
* UNTIL 530 PM MDT
* AT 224 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE
WARNED AREA. THE RADAR ESTIMATES THAT OVER 2 INCHES OF RAIN HAS
FALLEN OVER A SMALL AREA IN A SHORT AMOUNT OF TIME.
* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR.
THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...NORTH FORK
POWDER RIVER...BILLY CREEK...POISON CREEK...MIDDLE FORK CRAZY WOMAN
CREEK...DRY POISON CREEK...MATTOX CREEK...TWIN CREEK...BULL
CREEK...SEVENTYSIX CREEK...BEAVER CREEK...CORPE CREEK...GARDNER
CREEK...JOHNSON CREEK...SIMMONS CREEK...DOYLE CREEK AND TAYLOR CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
ADDITIONAL RAINFALL AMOUNTS OF ONE HALF TO TWO AND A HALF INCHES ARE
POSSIBLE IN THE WARNED AREA.
&&
REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT
1-800-211-1448.
LAT...LON 4398 10694 4400 10706 4408 10709 4411 10705
4412 10682 4401 10681
$$
ALLEN2 follow-up statements
879
WGUS75 KRIW 122120
FFSRIW
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
320 PM MDT TUE JUL 12 2011
WYC019-122330-
/O.CON.KRIW.FF.W.0009.000000T0000Z-110712T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JOHNSON WY-
320 PM MDT TUE JUL 12 2011
...FLASH FLOOD WARNING REMAINS IN EFFECT FOR WEST CENTRAL JOHNSON
COUNTY UNTIL 530 PM MDT...
AT 315 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. THE
STORMS HAVE WEAKENED SLIGHTLY...HOWEVER RADAR ESTIMATES EXCEED 4
INCHES OF RAINFALL DURING THE LIFE OF THIS STORM.
RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
OCCUR.
THE HAZELTON GAGE HAS RECORDED OVER ONE AND A HALF INCHES OF
RAINFALL IN A LITTLE LESS THAN ONE HOUR.
THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...
NORTH FORK POWDER RIVER...BILLY CREEK...POISON CREEK...MIDDLE FORK
CRAZY WOMAN CREEK...DRY POISON CREEK...MATTOX CREEK...TWIN CREEK...
BULL CREEK...SEVENTYSIX CREEK...BEAVER CREEK...CORPE CREEK...GARDNER
CREEK...JOHNSON CREEK...SIMMONS CREEK...DOYLE CREEK AND TAYLOR CREEK.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
ADDITIONAL RAINFALL AMOUNTS OF ONE QUARTER TO ONE INCH ARE POSSIBLE
IN THE WARNED AREA THROUGH 530 PM MDT.
IN HILLY TERRAIN...THERE ARE NUMEROUS LOW WATER CROSSINGS WHICH
ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL
ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW
INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY.
A FLASH FLOOD WARNING MEANS THAT FLASH FLOODING IS IMMINENT OR
OCCURRING. IF YOU ARE IN THE WARNING AREA...MOVE TO HIGHER GROUND
IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE
IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO
CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.
&&
REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT
1-800-211-1448.
LAT...LON 4398 10694 4400 10706 4408 10709 4411 10705
4412 10682 4401 10681
$$838
WGUS75 KRIW 122314
FFSRIW
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
514 PM MDT TUE JUL 12 2011
WYC019-122329-
/O.CAN.KRIW.FF.W.0009.000000T0000Z-110712T2330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
JOHNSON WY-
514 PM MDT TUE JUL 12 2011
...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR WEST CENTRAL
JOHNSON COUNTY IS CANCELLED...
THIS WARNING HAS BEEN REPLACED BY A NEW WARNING FOR WEST CENTRAL
JOHNSON COUNTY.
REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT
1-800-211-1448.
LAT...LON 4398 10694 4400 10706 4408 10709 4411 10705
4412 10682 4401 10681
$$
ALLENThe office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 6:54 PM MDT | Severe Thunderstorm Warning | RIW | Johnson | 51 min |
| Jul 11, 7:29 PM MDT | Special Weather Statement | RIW | 46 min | |
| Jul 11, 7:31 PM MDT | Special Weather Statement | RIW | Teton | 44 min |
| Jul 11, 10:12 PM MDT | Special Weather Statement | RIW | Teton | 63 min |
| Jul 12, 8:34 AM MDT | Special Weather Statement | RIW | Teton | 41 min |
| Jul 12, 10:31 AM MDT | Special Weather Statement | RIW | Teton | 44 min |
| Jul 12, 11:18 AM MDT | Special Weather Statement | RIW | Teton | 42 min |
| Jul 12, 11:56 AM MDT | Special Weather Statement | RIW | Johnson | 49 min |
| Jul 12, 12:03 PM MDT | Special Weather Statement | RIW | Teton | 42 min |
| Jul 12, 12:07 PM MDT | Flash Flood Watch | RIW | Fremont, Hot Springs, Lincoln, Park, Sublette, Teton | 6 hr |
| Jul 12, 12:12 PM MDT | Special Weather Statement | RIW | Hot Springs | 48 min |
| Jul 12, 12:33 PM MDT | Special Weather Statement | RIW | Teton | 42 min |
| Jul 12, 12:39 PM MDT | Special Weather Statement | RIW | Teton | 36 min |
| Jul 12, 12:46 PM MDT | Special Weather Statement | RIW | Sweetwater | 44 min |
| Jul 12, 1:24 PM MDT | Special Weather Statement | RIW | Sweetwater | 51 min |
| Jul 12, 1:30 PM MDT | Areal Flood Advisory | RIW | Park | 60 min |
| Jul 12, 1:40 PM MDT | Areal Flood Advisory | RIW | Johnson, Washakie | 60 min |
| Jul 12, 1:50 PM MDT | Special Weather Statement | RIW | Natrona | 40 min |
| Jul 12, 2:06 PM MDT | Special Weather Statement | RIW | Sublette | 39 min |
| Jul 12, 2:09 PM MDT | Flash Flood Warning | RIW | Johnson, Washakie | 3 hr |
| Jul 12, 2:32 PM MDT | Severe Thunderstorm Warning | RIW | Johnson, Washakie | 58 min |
| Jul 12, 3:59 PM MDT | Special Weather Statement | RIW | 46 min | |
| Jul 12, 4:26 PM MDT | Areal Flood Advisory | RIW | Fremont | 3 hr |
| Jul 12, 4:29 PM MDT | Special Weather Statement | RIW | Big Horn | 46 min |
| Jul 12, 4:32 PM MDT | Special Weather Statement | RIW | Big Horn | 43 min |
| Jul 12, 4:59 PM MDT | Flash Flood Warning | RIW | Johnson, Washakie | 7 hr |
| Jul 12, 5:12 PM MDT | Flash Flood Warning | RIW | Johnson | 6 hr |
| Jul 12, 5:13 PM MDT | Special Weather Statement | RIW | Fremont | 47 min |
| Jul 12, 5:49 PM MDT | Special Weather Statement | RIW | Hot Springs | 41 min |
Nearby
Flash Flood Warnings in Wyoming, 2011Every flash flood warning in 2011
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.