Alert archive / Iowa / Special Weather Statements in 2015
Special Weather Statement, NWS Omaha, NE
NWS Omaha, NE issued this special weather statement at Aug 9, 2015, 1:40 AM CDT for Fremont County, Iowa. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2015, 1:40 AM CDT (06:40 UTC)
- Expired
- Aug 9, 2015, 2:30 AM CDT
- In force
- 50 min
- Issued by
- NWS Omaha, NE
County Fremont County, IA
The radar
The Omaha radar (KOAX), 89 km from the middle of the area, began a volume at 06:42 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
Omaha, NE (KOAX), launched 00:00Z, 6.7 hours before the alert went out and 89 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
- 430 J/kg
- Mixed-layer CIN
- -176 J/kg
- Mixed-layer LCL
- 1221 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 277 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Omaha, NE wrote its last area forecast discussion before this special weather statement went out at Aug 9, 12:10 AM CDT, 1 hour 30 minutes earlier.
Area forecast discussion, Aug 9, 12:10 AM CDT, 1 hour 30 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 629 PM CDT SAT AUG 8 2015 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-091330- MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT- PAGE-KNOX-CEDAR-THURSTON-ANTELOPE-PIERCE-WAYNE-BOONE-MADISON- STANTON-CUMING-BURT-PLATTE-COLFAX-DODGE-WASHINGTON-BUTLER- SAUNDERS-DOUGLAS-SARPY-SEWARD-LANCASTER-CASS-OTOE-SALINE- JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-RICHARDSON- 629 PM CDT SAT AUG 8 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA...WEST CENTRAL IOWA...EAST CENTRAL NEBRASKA...NORTHEAST NEBRASKA AND SOUTHEAST NEBRASKA. .DAY ONE...TONIGHT AND SUNDAY SCATTERED THUNDERSTORMS ARE LIKELY TO DEVELOP THIS EVENING...MAINLY IN WEST CENTRAL TO SOUTHWEST IOWA INTO SOUTHEAST NEBRASKA. THESE STORMS MAY BE STRONG TO SEVERE...WITH HAIL AND GUSTY WINDS THE MAIN HAZARDS...AS WELL AS LOCALLY HEAVY RAINFALL. THUNDERSTORMS ARE POSSIBLE AGAIN ON SUNDAY AFTERNOON AND EVENING...MAINLY IN NORTHEAST NEBRASKA. A FEW OF THESE STORMS MAY BE STRONG TO SEVERE...WITH HAIL AND GUSTY WINDS THE MAIN HAZARDS. .DAYS TWO THROUGH SEVEN...SUNDAY NIGHT THROUGH FRIDAY A CHANCE OF THUNDERSTORMS CONTINUES ON SUNDAY NIGHT INTO MONDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT OR SUNDAY. MAYES
In the hours before
Special weather statement, Aug 8, 9:50 PM CDT, 3 hours 50 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA 950 PM CDT SAT AUG 8 2015 IAZ069-079-080-090-091-090330- FREMONT IA-PAGE IA-MILLS IA-POTTAWATTAMIE IA-MONTGOMERY IA- 950 PM CDT SAT AUG 8 2015 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN POTTAWATTAMIE... SOUTHWESTERN MONTGOMERY...EASTERN MILLS...NORTHWESTERN PAGE AND NORTHEASTERN FREMONT COUNTIES UNTIL 1030 PM CDT... AT 949 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES SOUTH OF MALVERN...OR 32 MILES SOUTHEAST OF OMAHA...MOVING NORTHEAST AT 35 MPH. DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... MALVERN...EMERSON...TABOR...HENDERSON...RANDOLPH...HASTINGS...IMOGENE AND COBURG. THIS INCLUDES THE FOLLOWING HIGHWAYS... HIGHWAY 34 IN IOWA BETWEEN MILE MARKERS 17 AND 30. HIGHWAY 59 IN IOWA BETWEEN MILE MARKERS 22 AND 37. PRECAUTIONARY/PREPAREDNESS ACTIONS... TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS. FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. && A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 300 AM CDT FOR SOUTHWESTERN IOWA. LAT...LON 4080 9568 4092 9577 4116 9539 4092 9524 TIME...MOT...LOC 0249Z 234DEG 29KT 4089 9564 DERGAN
Special weather statement, Aug 8, 11:24 PM CDT, 2 hours 16 minutes before
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</html>Special weather statement, Aug 9, 1:40 AM CDT, 0 minutes before
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</html>The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 8:01 PM CDT | Special Weather Statement | OAX | Nemaha | 44 min |
| Aug 8, 8:38 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha | 52 min |
| Aug 8, 8:57 PM CDT | Tornado Warning | OAX | Nemaha, Richardson | 33 min |
| Aug 8, 9:02 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha | 28 min |
| Aug 8, 9:18 PM CDT | Severe Thunderstorm Warning | OAX | Johnson, Nemaha | 27 min |
| Aug 8, 9:25 PM CDT | Tornado Warning | OAX | Johnson, Nemaha | 35 min |
| Aug 8, 9:31 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Richardson | 29 min |
| Aug 8, 10:00 PM CDT | Severe Thunderstorm Warning | OAX | Nemaha, Richardson | 45 min |
| Aug 8, 10:13 PM CDT | Areal Flood Advisory | OAX | Johnson, Nemaha, Pawnee, Richardson | 3 hr |
| Aug 8, 10:16 PM CDT | Severe Thunderstorm Warning | OAX | Richardson | 29 min |
| Aug 8, 10:27 PM CDT | Severe Thunderstorm Warning | OAX | Richardson | 18 min |
| Aug 8, 10:33 PM CDT | Tornado Warning | OAX | Richardson | 27 min |
| Aug 8, 10:45 PM CDT | Severe Thunderstorm Warning | OAX | Richardson | 30 min |
| Aug 8, 11:24 PM CDT | Special Weather Statement | OAX | Cass | 51 min |
| Aug 9, 12:04 AM CDT | Areal Flood Advisory | OAX | Douglas, Sarpy | 3 hr |
| Aug 9, 12:20 AM CDT | Special Weather Statement | OAX | Cass | 40 min |
| Aug 9, 12:58 AM CDT | Special Weather Statement | OAX | Cass | 47 min |
| Aug 9, 2:19 AM CDT | Areal Flood Advisory | OAX | Cass, Sarpy | 3 hr |
| Aug 9, 2:43 PM CDT | Special Weather Statement | OAX | Knox | 47 min |
| Aug 9, 2:50 PM CDT | Severe Thunderstorm Warning | OAX | Antelope, Knox | 40 min |
| Aug 9, 2:58 PM CDT | Severe Thunderstorm Warning | OAX | Knox | 32 min |
| Aug 9, 3:31 PM CDT | Special Weather Statement | OAX | Antelope | 44 min |
| Aug 9, 3:39 PM CDT | Special Weather Statement | OAX | Knox | 36 min |
| Aug 9, 4:17 PM CDT | Special Weather Statement | OAX | Pierce | 43 min |
| Aug 9, 4:52 PM CDT | Special Weather Statement | OAX | Madison | 38 min |
| Aug 9, 5:04 PM CDT | Severe Thunderstorm Warning | OAX | Antelope, Madison, Pierce | 26 min |
| Aug 9, 5:36 PM CDT | Special Weather Statement | OAX | Madison | 39 min |
| Aug 9, 5:59 PM CDT | Special Weather Statement | OAX | Boone | 46 min |
| Aug 9, 6:07 PM CDT | Areal Flood Advisory | OAX | Antelope, Madison | 3 hr |
| Aug 9, 6:12 PM CDT | Special Weather Statement | OAX | Madison | 48 min |
| Aug 9, 6:25 PM CDT | Special Weather Statement | OAX | Knox | 50 min |
| Aug 9, 6:30 PM CDT | Flash Flood Warning | OAX | Antelope, Madison | 3 hr |
| Aug 9, 6:41 PM CDT | Special Weather Statement | OAX | Boone | 49 min |
| Aug 8, 8:29 PM CDT | Special Weather Statement | OAX | Fremont | 46 min |
| Aug 8, 9:21 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery, Page | 39 min |
| Aug 8, 9:45 PM CDT | Severe Thunderstorm Warning | OAX | Montgomery | 33 min |
| Aug 8, 9:50 PM CDT | Special Weather Statement | OAX | Mills | 40 min |
| Aug 9, 12:10 AM CDT | Special Weather Statement | OAX | Fremont, Page | 50 min |
| Aug 9, 12:32 AM CDT | Areal Flood Advisory | OAX | Fremont | 3 hr |
| Aug 9, 1:21 AM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 24 min |
| Aug 9, 1:42 AM CDT | Special Weather Statement | OAX | Mills | 48 min |
| Aug 9, 1:45 AM CDT | Special Weather Statement | OAX | Page | 30 min |
| Aug 9, 3:42 AM CDT | Areal Flood Advisory | OAX | Fremont, Page | 3 hr |
| Aug 9, 10:08 AM CDT | River Flood Warning | OAX | Fremont | 7 days |
| Aug 9, 10:59 AM CDT | River Flood Warning | OAX | Fremont | 36 hr |
Nearby
Special Weather Statements in Iowa, 2015Every special weather statement 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.