Alert archive / Idaho / Flash Flood Warnings in 2013

Flash Flood Warning 22, NWS Pocatello, ID

September 2, 2013Blaine County, Idaho

NWS Pocatello, ID issued this flash flood warning at Sep 2, 2013, 10:27 PM MDT for Blaine County, Idaho. 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: Sep 2, 2013, 10:27 PM MDT (04:27 UTC)
Expired: Sep 3, 2013, 1:30 AM MDT
In force: 3 hr
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Flood severity: None

County Blaine County, ID

The radar

The Boise radar (KCBX), 134 km from the middle of the area, began a volume at 04:29 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Boise Airport, ID (KBOI), launched 00:00Z, 4.5 hours before the alert went out and 131 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: 12 J/kg
Mixed-layer CIN: -301 J/kg
Mixed-layer LCL: 2466 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 94 m²/s²
0-3 km storm-relative helicity: 280 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.

520 
WGUS55 KPIH 030427
FFWPIH
IDC013-030730-
/O.NEW.KPIH.FF.W.0022.130903T0427Z-130903T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE POCATELLO ID
1027 PM MDT MON SEP 2 2013

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WEST CENTRAL BLAINE COUNTY IN CENTRAL IDAHO...

* UNTIL 130 AM MDT

* AT 1018 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND 
OBSERVATIONS INDICATED 0.25 TO 0.50 INCHES OF HEAVY RAINFALL MOVING 
INTO THE BEAVER CREEK BURN SCAR AREA. THESE ACCUMULATIONS ARE HIGH 
ENOUGH TO PRODUCE FLASH FLOODING. 

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
  RURAL WESTERN BLAINE COUNTY...
  RURAL NORTHWESTERN BLAINE COUNTY...
  BEAVER CREEK BURN SCAR...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NATIONAL WEATHER SERVICE RADAR INDICATED THE POTENTIAL FOR FLASH 
FLOODING OVER THE BEAVER CREEK BURN AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 4365 11467 4367 11468 4379 11452 4342 11430
      4334 11454 4343 11455 4346 11452 4348 11452
      4350 11457 4353 11460 4356 11459 4359 11468
      4361 11469

$$

HUSTON

2 follow-up statements

296 
WGUS75 KPIH 030600
FFSPIH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
1200 AM MDT TUE SEP 3 2013

IDC013-030730-
/O.CON.KPIH.FF.W.0022.000000T0000Z-130903T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BLAINE ID-
1200 AM MDT TUE SEP 3 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM MDT FOR WEST
CENTRAL BLAINE COUNTY...

ALTHOUGH THE HEAVIEST PRECIPITATION HAS MOVED EAST...THE THREAT FOR 
FLASH FLOODING AND DEBRIS FLOW WILL CONTINUE IN AND AROUND THE 
BEAVER CREEK FIRE BURN AREA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

NATIONAL WEATHER SERVICE RADAR INDICATED THE POTENTIAL FOR FLASH 
FLOODING OVER THE BEAVER CREEK BURN AREA.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW
LYING AREAS ARE SUBJECT TO FLOODING.

&&

LAT...LON 4365 11467 4367 11468 4379 11452 4342 11430
      4334 11454 4343 11455 4346 11452 4348 11452
      4350 11457 4353 11460 4356 11459 4359 11468
      4361 11469

$$

TW

838 
WGUS75 KPIH 030711
FFSPIH

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
111 AM MDT TUE SEP 3 2013

IDC013-030718-
/O.CAN.KPIH.FF.W.0022.000000T0000Z-130903T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BLAINE ID-
111 AM MDT TUE SEP 3 2013

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WEST CENTRAL BLAINE
COUNTY...

THE THREAT FOR FLASH FLOODING HAS ENDED FOR NOW. 

THIS AREA DOES REMAIN UNDER A FLASH FLOOD WATCH FOR THE REMAINDER OF 
THE DAY. MODELS CONTINUE TO SHOW CONVECTION MOVING OVER THE AREA 
LATER THIS MORNING. 

LAT...LON 4365 11467 4367 11468 4379 11452 4342 11430
      4334 11454 4343 11455 4346 11452 4348 11452
      4350 11457 4353 11460 4356 11459 4359 11468
      4361 11469

$$

TW

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 Pocatello, ID wrote its last area forecast discussion before this flash flood warning went out at Sep 2, 10:00 PM MDT, 27 minutes earlier.

Area forecast discussion, Sep 2, 10:00 PM MDT, 27 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
1000 PM MDT MON SEP 2 2013

.SHORT TERM...TONIGHT THROUGH WEDNESDAY. QUICK UPDATE THIS EVENING
TO CONTINUE HIGHER PRECIPITATION ACTIVITY ACROSS THE WEST THROUGH 3
AM BUT ALLOW FLASH FLOOD WATCH ACROSS THE SOUTHERN HIGHLANDS TO
EXPIRE.  REMAINING WATCH FOR THE CNTRL MTNS WILL CONTINUE. SEE
PREVIOUS DISCUSSION BELOW HUSTON

SOUTHERLY FLOW AHEAD OF A DEEPENING UPPER LOW OFF THE PAC NW COAST
WILL CONTINUE TO STREAM MONSOON MOISTURE INTO ID THRU WED.
PRECIPITABLE WATER VALUES ARE EXCEPTIONALLY HIGH TODAY...THUS THE
HEAVY RAINFALL AMOUNTS. PRECIPITATION WILL REMAIN WIDESPREAD MAINLY
OVER THE EASTERN HALF OF THE FCST AREA THIS AFTN..THEN TAPER OFF
EARLY THIS EVENING. SHORT RANGE MODEL IS SHOWING SHOWERS DEVELOPING
OVERNIGHT IN THE CENTRAL MTNS. SHOWERS AND ISOLD TSTMS WILL DEVELOP
AGAIN ON TUE...WITH LOCALLY HEAVY RAINFALL AMOUNTS IN THE CENTRAL
MTNS. SHOWERS AND ISOLD TSTMS WILL DEVELOP AGAIN ON WED...BUT NOT
LOOKING QUITE AS WIDESPREAD.

.LONG TERM...THURSDAY THROUGH MONDAY. SHOWERS AND TSTMS ARE A
THREAT AGAIN ON THU AS THE UPPER LOW MOVES INTO OR. THE UPPER LOW
BEGINS TO MOVE TO THE NORTH BY FRI...BEGINNING A DRYING TREND WHICH
WILL GO THRU THE WEEKEND. HEDGES
&&

.AVIATION...OCCASIONAL SHOWERS AND THUNDERSTORMS WILL CONTINUE
ACROSS EASTERN IDAHO. DURING PERIODS OF HEAVY RAIN...WE HAVE SEEN
CEILINGS AND VISIBILITY DROP TO MVFR/IFR. THE FOCUS OF THE RAIN
SHIFTS WESTWARD OVERNIGHT AND TUESDAY...BUT JUST ABOUT ANYONE DURING
THE PERIOD HAS A CHANCE OF SHOWERS/STORMS. WE ARE CARRYING AT LEAST
VCSH/VCTS FOR ALL SITES...AND -SHRA VCTS DURING TIMES WHERE SHOWERS
ARE THE PREDOMINANT WEATHER.  KEYES
&&

.FIRE WEATHER...AN EXTREMELY MOIST AIRMASS WILL CONTINUE ACROSS THE
AREA THROUGH TOMORROW. WE HAVE HAD HEAVY RAIN AND FLOODING/DEBRIS
FLOWS ACROSS PORTIONS OF ZONES 427 AND 413 ALREADY TODAY. THE FOCUS
OF MORE WIDESPREAD RAIN AND THUNDER WILL SHIFT OVERNIGHT TO THE
WESTERN FIRE DISTRICTS. WE ARE EXPECTING MORE HEAVY RAIN AND THE
THREAT OF FLOODING/DEBRIS FLOWS OVER THOSE AREAS.  THAT
SAID...PRETTY MUCH ANYONE HAS A CHANCE OF SHOWERS AND STORMS WITH
POTENTIALLY HEAVY RAINFALL. MONSOON MOISTURE WILL KEEP THE THREAT IN
PLACE UNTIL THE END OF THE WEEK. THAT IS WHEN A LOW TRACKS EASTWARD
TO OUR NORTH...BUT WILL PULL A COOLER/DRIER AIRMASS INTO EASTERN
IDAHO OVER THE WEEKEND. KEYES
&&

.PIH WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH FROM MIDNIGHT MDT TONIGHT THROUGH TUESDAY EVENING
IDZ018-031-032.
&&

Hazardous weather outlook, Sep 2, 4:43 AM MDT, 17 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE POCATELLO ID
443 AM MDT MON SEP 2 2013

IDZ017>025-031-032-031045-
EASTERN MAGIC VALLEY-SAWTOOTH MOUNTAINS-UPPER SNAKE HIGHLANDS-
UPPER SNAKE RIVER PLAIN-LOWER SNAKE RIVER PLAIN-
SOUTH CENTRAL HIGHLANDS-CARIBOU HIGHLANDS-
CACHE VALLEY/IDAHO PORTION-WASATCH MOUNTAINS/IDAHO PORTION-
BIG AND LITTLE WOOD RIVER REGION-LOST RIVER/PAHSIMEROI-
443 AM MDT MON SEP 2 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO.

.DAY ONE...TODAY AND TONIGHT

EXPECT HEAVY RAINFALL TODAY OVER THE SOUTHERN AND SOUTHEAST
HIGHLANDS WHERE A FLASH FLOOD WATCH HAS BEEN ISSUED. HEAVY
RAINFALL WILL MOVE OVER THE CENTRAL MOUNTAINS TONIGHT INTO TUESDAY
PROMPTING ANOTHER FLASH FLOOD WATCH PARTICULARLY OVER BURN SCARS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

LOOK FOR HEAVY RAINFALL TUESDAY PARTICULARLY OVER THE CENTRAL
MOUNTAINS WHERE A FLASH FLOOD WATCH IS IN EFFECT. ADDITIONAL
RAINFALL IS EXPECTED LATER IN THE WEEK POSSIBLY WARRANTING FUTURE
FLASH FLOOD WATCHES.

.SPOTTER INFORMATION STATEMENT...

WE ASK TRAINED SPOTTERS AND CITIZENS TO REPORT SIGNIFICANT
WEATHER CONDITIONS WHEN IT IS SAFE TO DO SO. THESE CONDITIONS MAY
INCLUDE HAIL...TORNADOES...STRONG WIND...DUST STORMS...SNOWFALL...
EXTREME COLD TEMPERATURES...FREEZING RAIN OR HEAVY RAIN...DENSE
FOG...AND FLOODING OR ICE JAMS. INFORMATION ABOUT THESE HAZARDOUS
CONDITIONS SHOULD BE CALLED INTO YOUR NATIONAL WEATHER SERVICE
OFFICE IN POCATELLO USING THE 1-800 SEVERE WEATHER HOTLINE...OR
208-233-0834.

In the hours before

Local storm report, Sep 2, 7:39 PM MDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
739 PM MDT MON SEP 02 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0735 PM     HEAVY RAIN       2 NE POCATELLO          42.90N 112.44W
09/02/2013  M0.87 INCH       BANNOCK            ID   CO-OP OBSERVER

            STORM TOTAL PRECIPITATION IS 0.87

&&

DPHELPS

Local storm report, Sep 2, 8:01 PM MDT, 2 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
801 PM MDT MON SEP 02 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0730 PM     FLASH FLOOD      9 SSW OAKLEY            42.12N 113.95W
09/02/2013                   CASSIA             ID   LAW ENFORCEMENT

            CASSIA COUNTY SHERIFF RECEIVED REPORTS OF FLASH FLOODING
            ALONG GOOSE CREEK ROAD SOUTH OF OAKLEY.

&&

MH

Special weather statement, Sep 2, 8:17 PM MDT, 2 hours 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
817 PM MDT MON SEP 2 2013

IDZ022-030315-
ONEIDA ID-CASSIA ID-
817 PM MDT MON SEP 2 2013

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHEASTERN CASSIA COUNTY IN SOUTH CENTRAL IDAHO
  SOUTHWESTERN ONEIDA COUNTY IN SOUTHEAST IDAHO

UNTIL 915 PM MDT

AT 812 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 10 MILES WEST OF BLACK PINE...MOVING EAST AT 15
MPH.

WIND GUSTS UP TO 45 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH
HEAVY RAIN.

LOCATIONS IMPACTED INCLUDE...
   BLACK PINE...INTERSTATE 84 FROM THE UTAH LINE TO SWEETZER
   SUMMIT...

LAT...LON 4213 11328 4220 11269 4199 11267 4199 11327
TIME...MOT...LOC 0216Z 266DEG 13KT 4204 11315

HUSTON

Special weather statement, Sep 2, 8:37 PM MDT, 1 hour 50 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
837 PM MDT MON SEP 2 2013

IDZ022-030330-
CASSIA ID-
837 PM MDT MON SEP 2 2013

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHWESTERN CASSIA COUNTY IN SOUTH CENTRAL IDAHO

UNTIL 930 PM MDT

AT 830 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF THUNDERSTORMS MOVING NORTHEAST AT 20 MPH THROUGH THE
IDAHO-NEVADA-UTAH TRIPPLE POINT.

WIND GUSTS UP TO 45 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. INDIVIDUALS RECREATING
IN OR NEAR THE CITY OF ROCKS NATIONAL RESERVE SHOULD BE PREPARED FOR
ELEVATED RUNOFF FROM RURAL CREEKS AND DRAINAGES THROUGHOUT THE AREA.

LOCATIONS IMPACTED INCLUDE...
   ALMO...AND CITY OF ROCKS NATIONAL RESERVE...

LAT...LON 4199 11427 4200 11429 4215 11429 4234 11410
      4228 11365 4199 11337 4198 11338
TIME...MOT...LOC 0233Z 216DEG 17KT 4199 11431 4195 11398
          4173 11377

HUSTON

Local storm report, Sep 2, 8:58 PM MDT, 1 hour 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
858 PM MDT MON SEP 02 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0745 PM     FLASH FLOOD      14 ESE ALMO             42.02N 113.38W
09/02/2013                   CASSIA             ID   TRAINED SPOTTER

&&

MH

Special weather statement, Sep 2, 10:15 PM MDT, 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
1015 PM MDT MON SEP 2 2013

IDZ017-018-031-030515-
LINCOLN ID-BLAINE ID-CUSTER ID-
1015 PM MDT MON SEP 2 2013

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTH CENTRAL CUSTER COUNTY IN CENTRAL IDAHO
  CENTRAL BLAINE COUNTY IN CENTRAL IDAHO
  NORTHWESTERN LINCOLN COUNTY IN SOUTH CENTRAL IDAHO

UNTIL 1115 PM MDT

AT 1006 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF THUNDERSTORMS WEST OF HAILEY...MOVING NORTHEAST AT 25 MPH.

WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
BRIEF HEAVY RAIN AND SMALL HAIL.

LOCATIONS IMPACTED INCLUDE...
   HAILEY...
   BELLEVUE...AND KETCHUM...
   SUN VALLEY...
   BEAVER CREEK FIRE SCAR...

LAT...LON 4389 11421 4312 11376 4286 11438 4320 11458
      4321 11438 4332 11440 4334 11454 4343 11455
      4348 11452 4350 11457 4356 11460 4360 11469
      4366 11467 4368 11470
TIME...MOT...LOC 0413Z 239DEG 18KT 4359 11468 4299 11432

HUSTON

The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 2, 6:21 PM MDT	Special Weather Statement	PIH	Cassia	54 min
Sep 2, 6:45 PM MDT	Flash Flood Warning	PIH	Cassia	3 hr
Sep 2, 7:09 PM MDT	Special Weather Statement	PIH	Cassia	66 min
Sep 2, 7:25 PM MDT	Flash Flood Warning	PIH	Cassia	3 hr
Sep 2, 8:17 PM MDT	Special Weather Statement	PIH	Oneida	58 min
Sep 2, 8:37 PM MDT	Special Weather Statement	PIH	Cassia	53 min
Sep 2, 9:34 PM MDT	Flash Flood Warning	PIH	Cassia	56 min
Sep 2, 10:15 PM MDT	Special Weather Statement	PIH	Blaine, Lincoln	60 min
Sep 3, 1:56 PM MDT	Flash Flood Warning	PIH	Blaine, Custer	4 hr
Sep 3, 2:01 PM MDT	Flash Flood Warning	PIH	Cassia	5 hr
Sep 3, 3:55 PM MDT	Areal Flood Advisory	PIH	Bannock, Power	3 hr
Sep 3, 4:19 PM MDT	Flash Flood Warning	PIH	Cassia, Power	4 hr
Sep 3, 4:26 PM MDT	Flash Flood Warning	PIH	Bannock, Power	4 hr
Sep 3, 4:51 PM MDT	Flash Flood Warning	PIH	Bannock, Bingham, Caribou	4 hr
Sep 3, 5:33 PM MDT	Special Weather Statement	PIH	Bonneville	72 min
Sep 3, 5:50 PM MDT	Special Weather Statement	PIH	Caribou	55 min
Sep 3, 5:57 PM MDT	Special Weather Statement	PIH	Bingham	48 min

Nearby

Flash Flood Warnings in Idaho, 2013 Every flash flood warning in 2013

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.