Alert archive / Idaho / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 55, NWS Pocatello, ID

June 15, 20154 counties in Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jun 15, 2015, 8:00 PM MDT for 4 counties in Idaho. It was in force for 45 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: Jun 15, 2015, 8:00 PM MDT (02:00 UTC)
Expired: Jun 15, 2015, 8:45 PM MDT
In force: 45 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon

Counties Bear Lake County, ID, Bonneville County, ID, Caribou County, ID, Franklin County, ID

The radar

The Pocatello radar (KSFX), 103 km from the middle of the area, began a volume at 02:01 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 15, 2:24 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 00:00Z, 2.0 hours before the alert went out and 210 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: 158 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 3399 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Pocatello, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 15, 1:34 PM MDT, 6 hours 26 minutes earlier.

Area forecast discussion, Jun 15, 1:34 PM MDT, 6 hours 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
134 PM MDT MON JUN 15 2015

.SHORT TERM...TONIGHT THROUGH THU AFTERNOON. STORM PREDICTION
CENTER EXPECTS TO ISSUE A SEVERE THUNDERSTORM WATCH FOR PORTIONS
OF THE FORECAST AREA FOR THIS AFTERNOON AND EVENING. NEARLY THE
ENTIRE FORECAST AREA...OUTSIDE OF THE CENTRAL IDAHO MOUNTAINS...IS
IN A MARGINAL AREA. SOME EASTERN COUNTIES ARE IN SLIGHT RISK.

THE LOW GENERATING THE LOW-LEVEL CONVERGENCE AND BRINGING WITH IT
THE UNSTABLE AIR IS MOVING THROUGH NORTHERN UT AND WILL PASS
CLOSELY BY AS IT SHIFTS INTO WY AND CO. CAPE EVEN ON THE
CONSERVATIVE GFS IS REGISTERING LARGE PLACES ABOVE 1000 J/KG. THE
MORNING RUN OF THE NAM HAD CAPE AS LARGE AS 3600 J/KG. MAIN FOCUS
IS PLACES SOUTH OF IDAHO FALLS AND EAST OF AMERICAN FALLS. SOME
MORNING CONVECTION AT AROUND 15/0800 MDT PRODUCED A GUST TO 46KT
IN THE BEAR LAKE BASIN.

BY TUE AFTERNOON...THE UPPER LEVEL RIDGE OVER SOUTHERN CA WILL
EXPAND NORTHWARD AND PUSH THE UNSTABLE BOUNDARY AREA MORE INTO
MONTANA...WITH THE THUNDERSTORM THREAT LIMITED TO THE ID-MT BORDER
REGION. FOR THE REMAINDER OF THE PERIOD...THE STABLE AND DRY
WEST- SOUTHWEST UPPER LEVEL FLOW WILL MEAN A QUIET PERIOD FOR WED
AND THU AFTERNOONS/EVES. LOOK FOR WARMING AS SKIES CLEAR AND THE
WARMER AND DRIER AIRMASS SURGES NORTHWARD. OUTSIDE OF
THUNDERSTORMS...DO NOT FORSEE ANY SIGNIFICANT WIND.

.LONG TERM...THU NIGHT THROUGH NEXT MON NIGHT. THE STRONG RIDGING
WILL MEAN A PROLONGED PERIOD OF SUNNY SKIES WITH A TROUGH ON FRI
AFTERNOON AND EVENING POSSIBLY GENERATING SOME MOUNTAIN AND
HIGHLAND SHOWERS AND THUNDERSTORMS. NO MAJOR FRONT EXPECTED DURING
THIS TIME. TEMPERATURES ABOVE NORMAL AND VERY DRY CONDITIONS FOR
THE SNAKE RIVER PLAIN AND POINTS SOUTH. EVEN FOR THE
MOUNTAINS...ONLY A SLIGHT CHANCE TO LOW CHANCE FOR
PRECIPITATION/THUNDERSTORMS. MODERATE TO STRONG WIND POSSIBLE WITH
THE FRI TROUGH...BUT SHOULD STAY BELOW ADVISORY CONDITIONS.

MESSICK

&&
.AVIATION...SHOWERS AND THUNDERSTORMS WILL BE AROUND THROUGH
SUNSET...WITH A GRADUAL DECREASE IN COVERAGE OVERNIGHT. THE LAST
AIRPORT THAT COULD SEE SHOWERS WILL BE KIDA AND THE RISK FOR THAT
SHOULD END AROUND 8-9Z. WINDS OVER 40KTS AND HAIL ARE THE MAIN
THREATS WITH STORMS. STORMS WILL REDEVELOP TOMORROW AFTERNOON...BUT
MOSTLY ACROSS THE NORTHERN HALF OF EASTERN IDAHO. KPIH AND KBYI
SHOULD BE IN THE CLEAR...BUT EXPECT AT LEAST VCTS FOR KSUN AND KIDA.
AGAIN...WINDS OVER 40KTS AND HAIL WILL BE POSSIBLE TOMORROW. THE
THREAT FOR HEAVY RAIN IS MUCH SMALLER...BUT NOT NECESSARILY ZERO.
KEYES

&&
.FIRE WEATHER...SHOWERS AND THUNDERSTORMS TODAY WILL WIND DOWN AFTER
SUNSET ACROSS THE REGION...WITH REDEVELOPMENT ACROSS THE NORTHERN
HALF OF EASTERN AND CENTRAL IDAHO TOMORROW AFTERNOON AND EVENING.
WITH SLIGHTLY DRIER AIR IN PLACE...THE THREAT FOR RAINFALL OVER 0.10
INCHES IS LOWER OVERALL BUT SOME ISOLATED POCKETS OVER THAT ARE
POSSIBLE. AFTER THAT...THE PATTERN SHIFTS NORTHWARD A BIT MORE. THAT
MEANS THE BULK OF THE STORM TRACK REMAINS FAR ENOUGH NORTH...EXCEPT
FOR OCCASIONAL CHANCE OF A FEW STORMS ACROSS THE CENTRAL MOUNTAINS
ALONG THE MONTANA BORDER. FARTHER SOUTH...EXPECT GUSTY WINDS AND DRY
AIR TO CONTINUE THE PROCESS OF DRYING THINGS OUT.  KEYES

&&
.PIH WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

In the hours before

Local storm report, Jun 15, 6:07 PM MDT, 1 hour 53 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
607 PM MDT MON JUN 15 2015

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

0545 PM     HAIL             ABERDEEN                42.94N 112.84W
06/15/2015  E0.75 INCH       BINGHAM            ID   SOCIAL MEDIA

            FROM KIFI FACEBOOK PAGE. TIME ESTIMATED BY RADAR.

&&

ADESMET

Local storm report, Jun 15, 6:34 PM MDT, 1 hour 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
634 PM MDT MON JUN 15 2015

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

0628 PM     HAIL             5 WNW BLACKFOOT         43.22N 112.44W
06/15/2015  M0.88 INCH       BINGHAM            ID   TRAINED SPOTTER

            BEGAN AS PEA-SIZE AND INCREASED TO DIME-SIZE WITH A FEW
            NICKEL HAILSTONES.

0625 PM     HAIL             MORELAND                43.22N 112.45W
06/15/2015  M1.00 INCH       BINGHAM            ID   NWS EMPLOYEE

            MEASURED AT TIME OF EVENT.

&&

GWICKLUN

Local storm report, Jun 15, 6:52 PM MDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
652 PM MDT MON JUN 15 2015

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

0650 PM     HAIL             7 W POCATELLO           42.88N 112.61W
06/15/2015  M1.00 INCH       POWER              ID   NWS EMPLOYEE

            AT THE WEATHER FORECAST OFFICE,POCATELLO REGIONAL
            AIRPORT.

&&

GWICKLUN

Local storm report, Jun 15, 7:26 PM MDT, 34 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
726 PM MDT MON JUN 15 2015

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

0630 PM     HAIL             BLACKFOOT               43.19N 112.35W
06/15/2015  E1.00 INCH       BINGHAM            ID   SOCIAL MEDIA

            SIZE ESTIMATED FROM VIDEO SUBMITTED TO KIFI TV FACEBOOK
            PAGE. TIME ESTIMATED BY RADAR.

&&

ADESMET

Local storm report, Jun 15, 7:35 PM MDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
735 PM MDT MON JUN 15 2015

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

0718 PM     HAIL             1 NW DOWNEY             42.44N 112.14W
06/15/2015  E1.00 INCH       BANNOCK            ID   TRAINED SPOTTER

            HAIL BEGAN AS DIME-SIZE. RAIN AND HAIL MIX SO HEAVY,
            VISIBILITY IS LESS THAN 15 FEET. WITH EASING OF RAIN,
            ESTIMATE THREE INCHES OF STANDING WATER LIES BETWEEN
            HOUSE AND BARN.

&&

GWICKLUN

Local storm report, Jun 15, 7:38 PM MDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
738 PM MDT MON JUN 15 2015

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

0733 PM     HEAVY RAIN       1 NNW DOWNEY            42.44N 112.13W
06/15/2015  M0.52 INCH       BANNOCK            ID   TRAINED SPOTTER

            THUNDERSTORM RAINFALL ACCUMULATION OCCURRED IN 15
            MINUTES.

&&

GWICKLUN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 15, 6:42 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Power	48 min
Jun 15, 6:46 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Caribou	59 min
Jun 15, 7:01 PM MDT	Tornado Warning	PIH	Bingham, Bonneville, Caribou	29 min
Jun 15, 7:09 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Caribou, Franklin, Oneida	54 min
Jun 15, 7:27 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville	16 min
Jun 15, 7:40 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Caribou	20 min
Jun 15, 7:54 PM MDT	Severe Thunderstorm Warning	PIH	Clark, Fremont	51 min
Jun 15, 8:50 PM MDT	Special Weather Statement	PIH	Fremont	40 min
Jun 16, 2:21 PM MDT	Special Weather Statement	PIH	Fremont	39 min
Jun 16, 2:44 PM MDT	Special Weather Statement	PIH	Fremont	46 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2015 Every severe thunderstorm warning in 2015

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.