Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 7, NWS Boise, ID
NWS Boise, ID issued this red flag warning at Jul 4, 2021, 8:10 AM MDT for 10 counties in Idaho. It took effect at Jul 4, 2021, 12:00 PM MDT. It was in force for 11 hr. 21 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 4, 2021, 8:10 AM MDT (14:10 UTC)
- In effect from
- Jul 4, 2021, 12:00 PM MDT
- Expired
- Jul 4, 2021, 11:00 PM MDT
- In force
- 11 hr
- Issued by
- NWS Boise, ID
Counties Boise County, ID, Camas County, ID, Elmore County, ID, Gem County, ID, Gooding County, ID, Jerome County, ID, Lincoln County, ID, Owyhee County, ID, Twin Falls County, ID, Valley County, ID
The radar
The Boise radar (KCBX), 86 km from the middle of the area, began a volume at 14:14 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 4, 5:31 PM MDT | TSTM WND GST 53 | 13 Ssw Riddle, ID | MESONET STATION SPAI1 SHO-PAI. |
| Jul 4, 5:31 PM MDT | NON-TSTM WND GST 53 | 13 Ssw Riddle, ID | MESONET STATION SPAI1 SHO-PAI. |
| Jul 4, 6:52 PM MDT | TSTM WND GST 49 | 20 Wsw Castleford, ID | MESONET STATION HBFI1 HORSE BUTTE. |
| Jul 4, 6:52 PM MDT | NON-TSTM WND GST 49 | 20 Wsw Castleford, ID | MESONET STATION HBFI1 HORSE BUTTE. |
| Jul 4, 7:02 PM MDT | TSTM WND GST 59 | 7 Se Hot Springs, ID | MESONET STATION TT087 SAYLOR CREEK. |
| Jul 4, 7:02 PM MDT | NON-TSTM WND GST 59 | 7 Se Hot Springs, ID | MESONET STATION TT087 SAYLOR CREEK. |
| Jul 4, 7:05 PM MDT | TSTM WND GST 48 | 1 S Mountain Home Afb, ID | AWOS STATION KMUO MOUNTAIN HOME AFB. |
| Jul 4, 7:05 PM MDT | NON-TSTM WND GST 48 | 1 S Mountain Home Afb, ID | AWOS STATION KMUO MOUNTAIN HOME AFB. |
| Jul 4, 7:24 PM MDT | TSTM WND GST 56 | 6 S Twin Falls, ID | ASOS STATION KTWF TWIN FALLS. |
| Jul 4, 7:24 PM MDT | NON-TSTM WND GST 56 | 6 S Twin Falls, ID | ASOS STATION KTWF TWIN FALLS. |
| Jul 4, 7:25 PM MDT | TSTM WND GST 48 | 8 Wnw Mountain Home Afb, ID | MESONET STATION TS962 7 WNW MOUNTAIN HOME AFB. |
| Jul 4, 7:25 PM MDT | NON-TSTM WND GST 48 | 8 Wnw Mountain Home Afb, ID | MESONET STATION TS962 7 WNW MOUNTAIN HOME AFB. |
| Jul 4, 7:35 PM MDT | TSTM WND GST 47 | 3 E Jerome, ID | AWOS STATION KJER JEROME COUNTY. |
| Jul 4, 7:35 PM MDT | NON-TSTM WND GST 47 | 3 E Jerome, ID | AWOS STATION KJER JEROME COUNTY. |
| Jul 4, 7:40 PM MDT | TSTM WND DMG | 6 Sw Wendell, ID | REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF. |
| Jul 4, 7:44 PM MDT | TSTM WND GST 50 | 10 Ssw Hill City, ID | MESONET STATION DEHI1 DEER HAVEN. |
| Jul 4, 7:44 PM MDT | NON-TSTM WND GST 50 | 10 Ssw Hill City, ID | MESONET STATION DEHI1 DEER HAVEN. |
| Jul 4, 7:52 PM MDT | TSTM WND GST 49 | 1 S Mountain Home Afb, ID | MESONET STATION MTHI1 MOUNTAIN HOME AFB RAWS. |
| Jul 4, 7:52 PM MDT | NON-TSTM WND GST 49 | 1 S Mountain Home Afb, ID | MESONET STATION MTHI1 MOUNTAIN HOME AFB RAWS. |
| Jul 4, 7:55 PM MDT | TSTM WND GST 53 | 17 Wsw Hagerman, ID | MESONET STATION TWBI1 TWIN BUTTES. |
| Jul 4, 7:55 PM MDT | NON-TSTM WND GST 53 | 17 Wsw Hagerman, ID | MESONET STATION TWBI1 TWIN BUTTES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 2.2 hours before the alert went out and 85 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
- 130 J/kg
- Mixed-layer CIN
- -328 J/kg
- Mixed-layer LCL
- 2872 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 21 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
038 WWUS85 KBOI 041410 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 810 AM MDT Sun Jul 4 2021 .An upper level impulse will move north into the area today and help create scattered thunderstorm coverage. Wetting rains are likely in the cores of the stronger storms as there is sufficient moisture, but weaker cells still capable of lightning will be mostly dry. Much drier air moves in tomorrow, so this is the last day in this period of thunderstorm activity. IDZ403-421-423-424-426-ORZ636-637-042130- /O.NEW.KBOI.FW.W.0007.210704T1800Z-210705T0500Z/ Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Burns BLM-Vale BLM- 810 AM MDT Sun Jul 4 2021 /710 AM PDT Sun Jul 4 2021/ ...RED FLAG WARNING IN EFFECT FROM NOON MDT /11 AM PDT/ TODAY TO 11 PM MDT /10 PM PDT/ THIS EVENING FOR LIGHTNING FOR NORTHERN BOISE NATIONAL FOREST...SOUTHERN BOISE NATIONAL FOREST/WESTERN SAWTOOTH NATIONAL FOREST...OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM...SOUTHERN HIGHLANDS...BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 403...421...423...424...426...636 AND 637... The National Weather Service in Boise has issued a Red Flag Warning, which is in effect from noon MDT /11 AM PDT/ today to 11 PM MDT /10 PM PDT/ this evening. * THUNDERSTORMS...Scattered thunderstorms will develop early this afternoon in southern areas, spreading north late this afternoon and this evening. * OUTFLOW WINDS...Gusts to 50 mph are possible with the stronger storms, while gusts to 35 mph will be common. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ L
2 follow-up statements
292 WWUS85 KBOI 042043 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 243 PM MDT Sun Jul 4 2021 .An upper level impulse will move north into the area today and help create scattered thunderstorm coverage. Wetting rains are likely in the cores of the stronger storms as there is sufficient moisture, but weaker cells still capable of lightning will be mostly dry. The eastern edge of Eastern Payette NF may see abundant lightning, but confidence is not high enough to add that district to the RFW. Gust front winds could hit 60 mph in isolated cases, with 30-50 mph more common. IDZ403-421-423-424-426-ORZ636-637-050445- /O.CON.KBOI.FW.W.0007.000000T0000Z-210705T0500Z/ Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Burns BLM-Vale BLM- 243 PM MDT Sun Jul 4 2021 /143 PM PDT Sun Jul 4 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 11 PM MDT /10 PM PDT/ THIS EVENING FOR LIGHTNING FOR NORTHERN BOISE NATIONAL FOREST... SOUTHERN BOISE NATIONAL FOREST/WESTERN SAWTOOTH NATIONAL FOREST... OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM...SOUTHERN HIGHLANDS... BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 403...421... 423...424...426...636 AND 637... * THUNDERSTORMS...Scattered thunderstorms that have developed early this afternoon in southern areas will spread into northern areas this evening. * OUTFLOW WINDS...Gusts to 60 mph are possible with the stronger storms, while gusts 30-50 mph will be common. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ W L
799 WWUS85 KBOI 050452 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 1052 PM MDT Sun Jul 4 2021 IDZ403-421-423-424-426-ORZ636-637-050600- /O.EXP.KBOI.FW.W.0007.000000T0000Z-210705T0500Z/ Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Burns BLM-Vale BLM- 1052 PM MDT Sun Jul 4 2021 /952 PM PDT Sun Jul 4 2021/ ...RED FLAG WARNING WILL EXPIRE AT 11 PM MDT /10 PM PDT/ THIS EVENING FOR LIGHTNING FOR NORTHERN BOISE NATIONAL FOREST... SOUTHERN BOISE NATIONAL FOREST/WESTERN SAWTOOTH NATIONAL FOREST... OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM...SOUTHERN HIGHLANDS... BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 403...421... 423...424...426...636 AND 637... Thunderstorms across the warned area have weakened so that lightning and gusty wind are no longer expected to be significant threats overnight. Therefore, the Red Flag Warning will be allowed to expire. $$ L
The office that day
Everything else NWS Boise, ID issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 5:04 PM MDT | Special Weather Statement | BOI | Owyhee | 41 min |
| Jul 4, 5:45 PM MDT | Special Weather Statement | BOI | Owyhee | 45 min |
Nearby
Red Flag Warnings in Idaho, 2021Red Flag Warnings in Oregon, 2021Every red flag warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.